Civil low-enriched uranium hexafluoride environmental accounting

1. Scope and Applicability

This PCR defines public civil environmental accounting for one conventional low-enriched uranium hexafluoride (UF6) compound supplied at a producer gate. It requires a documented civil light-water-reactor fuel supply specification and segregated product records. The producer's public description establishes a solid enriched UF6 delivery state and weighing records (urenco-civil-product). It supplies no default assay or purity here.

Exclude plutonium, reprocessed uranium, high-enriched uranium, advanced fuel grades including LEU+ and HALEU, uranium metal, oxides, ceramics, fuel pellets/rods/assemblies, alloys, dispersions and formulated mixtures. A supply solution is not this solid compound: active solute and carrier-water accounting would require another reviewed scope. Natural uranium input and depleted output are distinguished from the enriched product. No reactor-energy functional equivalence, avoided-power credit or radiation-dose claim is made.

Only aggregate environmental inputs, outputs and supporting measurements are authored. Concentration/separation operations, cascade configuration, equipment implementation, material fabrication, operating targets and optimization are outside this guidance. Public facility totals establish possible monitoring domains, never a recipe, production coefficient or default quantity (urenco-environment). A different SKU, feed history, product state or boundary requires applicability review.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.other-transportable-goods-except-metal-products-machinery-and-equipment.coke-oven-products-refined-petroleum-products-nuclear-fuel.civil-low-enriched-uranium-hexafluoride
classification_refs	CPC 3.0:33620; narrower scope limited to the product and route defined here; mapping acceptance is maintained separately in classifications/mappings/.
covered_products	One segregated conventional civil low-enriched solid UF6 compound at the producer delivery gate
excluded_products	Plutonium; reprocessed uranium; advanced/high-enriched grades; metal, oxide, ceramic, alloy, dispersion or formulated mixture; fuel assemblies; enrichment services measured only as work units
representative_product	Actual accepted civil UF6 lot with independently verified net compound mass and supplier certificate
production_route	Documented licensed civil supplier; aggregate environmental inventory of the selected site boundary, with no operational enrichment instructions
market_state	Solid UF6 in a declared delivery container; container tare excluded from the compound reference mass

3. Reference Flow

Field	Value
What	Supply the declared civil UF6 compound as feedstock for downstream civil fuel fabrication
How much	1 kg net accepted UF6 compound
How well	Actual conventional civil customer specification and accepted lot composition; no default purity or isotope assay
How long or cycle	One delivery gate; temporal inventory covers a matched declared reporting period, not reactor lifetime
reference_flow_link	civil_uf6

Field	Value
Reference amount	1
Reference product flow	Uranium enriched in U235 and its compounds, plutonium and its compounds, alloys, dispersions, ceramic products and mixtures containing uranium enriched in U235, plutonium or compounds of these products 1fd727d2-a1bf-430d-80ba-2bfa822ea822
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	Civil end use; actual SKU/lot/provider; UF6 composition and impurity basis; conventional accepted specification; non-reprocessed origin; solid delivery state; net compound mass; tare exclusion; site/geography/period; foreground starting/ending gates; upstream and waste-treatment coverage; allocation decision and uncertainty

The full native name and comments include enriched uranium compounds without a metal-only chemical restriction; this permits a conditional identity for the single UF6 subset, not a uranium/plutonium basket. A CPC label alone cannot override an incompatible CAS, formula, route or grade. The broad record has no actual isotope composition or current customer grade: a source-generic grade is not a verified lot. Collect the actual certificate or planned qualified sampling evidence before completing a dataset; future collection is permitted and missing values remain unknown. Required qualifiers are obligations, not claims of completed verification. Identity matching does not establish supplier-dataset compatibility.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_mass	reference product	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Use net accepted whole UF6 compound mass, excluding delivery-container tare. Define positive independently measured period output D through cp_product. kg of uranium, kg of U-235, activity and service work units are different bases.
separate_activity	radionuclide emissions	Radioactivity 93a60a56-a3c8-17da-a746-0800200c9a66	Bq	Preserve isotope, medium and reference date. The verified unit group has kBq as reference and Bq as a supported unit (1 Bq = 0.001 kBq); this unit conversion is not a mass/activity or dose conversion. Never infer isotope-specific activity from total alpha.
utility_basis	utility rows	Native reference property	Native reference unit	Electricity identity uses Net calorific value/MJ (1 kWh = 3.6 MJ); gas uses Volume/m3; selected tap water uses Mass/kg. Collect compatible provider bases; preserve wet/dry, temperature and pressure information, with no universal density or heating value.

Whole-lot net delivered mass is the reference quantity. Record UF6 mass portion and impurities on their stated whole-lot denominator; record elemental-U mass separately on the sampled material and moisture basis. Isotope fractions require an explicit uranium-only denominator and mass/atom/activity convention. Activity retains its individual nuclide, environmental medium, sampling interval and reference date. None of these quantities is interchangeable with compound kg, dose, chemical purity or total uranium alpha. Any laboratory conversion requires its documented material scope, method and uncertainty; no universal factor is supplied. For an activity amount a collected in Bq, the supported native reference amount is 0.001 × a kBq; an amount reported in kBq is 1000 × that amount in Bq. Keep the original unit and date when normalizing by D.

5. System Boundary

Boundary Abstraction

Field	Value
declared_starting_condition	Receipt of documented natural UF6 at the licensed civil site boundary; upstream extraction and conversion require compatible separate datasets
starting_condition_role	Supplied upstream material, not a burden-free resource
product_classification_scope	Only the defined conventional civil UF6 subset of CPC33620; natural feed and depleted output are separate identities
recursive_input_rule	Same-category supplied enriched UF6, if introduced, is a separate measured input with its own upstream boundary and provenance; this natural-feed route cannot silently absorb it
upstream_dataset_requirement	Verified feed, utility and transport providers with matching material state, quantity, geography, period and gate; disclose missing upstream coverage
disclosure	Declare site reporting period, feed origin, output gate, stored by-products, transport endpoints, container coverage, shared-site allocation, infrastructure/end-of-life coverage and missing inventory

• civil_environment_boundary: Use one aggregate foreground environmental unit covering attributable utilities, environmental controls, storage and delivery within the declared site gate. Keep actual production stages as independently metered collection scopes without publishing technical operation instructions. Preserve physical internal links with equal amounts at both ends; cancel internal transfers only when aggregating this unit.
• environmental_streams: Separate purchased inputs, transferable products, waste sent for treatment and releases to each environmental medium. Radioactive waste and air/water releases require site-specific permitted monitoring (ea-nuclear-environment). Use CWW BAT2(II–III) stream-characterization principles only as analogous chemical environmental inventory practice; nuclear limits and permit applicability are not imported (jrc-cww-bat2).
• complete_scope: The cards below are a concrete conditional baseline, not an exhaustive plant bill of materials. Before a completed dataset, reconcile all actual site environmental streams and permits; add one atomic row for every additional fuel, purchased heat, water source, chemical, cylinder/overpack material, refrigerant, waste and emission. Record actual compositions and destinations. No absent, unmeasured or unresolved stream may silently become zero. Container reuse requires actual lifetime/use allocation; neither container-free supply nor a container recipe is assumed.
• physical_scope_register: Reconcile every actual boundary inflow/outflow and opening/closing stock. Include wet intake/exhaust air and its dry-air/moisture basis, water vapour, liquid water, cooling returns, condensate, aqueous carriers, retained filters/sludge/contamination, returned product and residual material, packing, cylinders/overpacks, maintenance supplies and wastes. Record actual quantity and fate per atomic exchange; add identities only after verification. Internal air/water circulation is not an external input or release. Purchased transport, storage, treatment and maintenance services are separate service records; their background inventories must not be added as duplicate foreground physical streams.
• energy_scope_register: Reconcile metered electricity, each actual fuel, purchased heat/steam/cooling, exported energy and energy accumulation/loss on consistent reporting scopes. Collect time-integrated readings; where only power is observed, record the measured time profile and integrate it over the actual interval. Nameplate power, calendar hours or an assumed load factor cannot establish consumption. Purchased-utility burdens and site-owned direct emissions remain separate (urenco-environment).

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
civil_environment	Aggregate public civil UF6 environmental account	required	Only the scoped licensed natural-feed/conventional civil-product boundary	foreground environmental unit	1 kg reference flow

Process: Aggregate public civil UF6 environmental account (civil_environment)

Inputs

Product flows

Natural feed (natural_feed)

Conditional UF6 chemical identity for documented natural-isotope feed only; the native record does not verify natural composition or a current lot grade and declares CN supply geography. Actual origin, composition, state and supplier geography/gate must be established separately. It is not the enriched reference product. Upstream conversion requires a compatible supplier dataset; reprocessed uranium is excluded.

• Selected flow: Uranium hexafluoride e0aa0856-f028-4d22-bab5-660613307174
• Flow property / unit: Mass / kg
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_feed. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_feed
• Sources: urenco-civil-product

Electricity (electricity)

Only grid-average medium-voltage 1–35 kV supply at the user meter; the native identity declares CN supply geography and cannot establish a non-CN background provider. Metered kWh may be converted with the verified unit group. A specific electricity contract requires a separately compatible provider; this identity does not prove its generation mix.

• Selected flow: Alternating current 3d76981f-964a-4865-b588-0e067a2a1163
• Flow property / unit: Net calorific value / MJ
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_electricity. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_electricity
• Sources: urenco-environment; ea-nuclear-environment

Natural gas (natural_gas)

Conditional auxiliary pipeline gas at consumption, not pure methane or liquefied gas. Record composition, temperature, absolute pressure, wet/dry basis, compressibility and provider m3 definition; do not use the secondary mass coefficient as density. Unresolved compatibility blocks the background link.

• Selected flow: natural gas in the gaseous state 4f19ca0e-7b3b-11dd-ad8b-0800200c9a66
• Flow property / unit: Volume / m3
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_gas. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_gas
• Sources: urenco-environment; ea-nuclear-environment

Supply water (supply_water)

Only actual treated tap water supplied to the site. Metered volume requires measured or supplier-supported density at the recorded conditions; no default conversion. Other abstraction sources need separate atomic rows.

• Selected flow: Tap water d1e0e36c-07f0-4a75-bdcb-efb5d9e2ac36
• Flow property / unit: Mass / kg
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_water. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_water
• Sources: urenco-environment; ea-nuclear-environment

Waste flows

Elementary flows

Outputs

Product flows

Civil uf6 (civil_uf6)

The broad database name is used solely for this single conventional civil low-enriched UF6 compound, accepted as a solid at the producer delivery gate. It does not represent plutonium, an alloy, a dispersion, a ceramic or an arbitrary mixture. Supplier composition and gate compatibility are required.

• Selected flow: Uranium enriched in U235 and its compounds, plutonium and its compounds, alloys, dispersions, ceramic products and mixtures containing uranium enriched in U235, plutonium or compounds of these products 1fd727d2-a1bf-430d-80ba-2bfa822ea822
• Flow property / unit: Mass / kg
• Amount rule: 1 kg
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_product
• Sources: urenco-civil-product

Depleted uf6 (depleted_uf6)

Conditional physically segregated depleted UF6 output. This broad compound identity is narrowed to UF6 only; exclude thorium, metal and oxide. Record destination, legal product/waste status and any retained inventory. Product designation requires documented subsequent use; otherwise resolve a separate waste identity. Do not infer production quantities or credits. At the aggregate site gate this row records actual external product transfer only; material remaining on site is closing stock. If storage is a separate modelled unit, use equal measured internal-link endpoints and cancel that transfer once at site aggregation.

• Selected flow: Uranium depleted in U235 and its compounds, thorium and its compounds, alloys, dispersions, ceramic products and mixtures containing uranium depleted in U235, thorium or compounds of these products f9e02fdf-db98-4802-9f1d-10d680f67065
• Flow property / unit: Mass / kg
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_coproduct. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_coproduct
• Sources: urenco-civil-product

Waste flows

Spent filter (spent_filter)

Conditional actual stream only; preserve specific physical identity, composition, compartment and receiver. UUID remains unresolved; no substitute and no assumed zero.

• Selected flow: Uranium-contaminated spent air filter
• Flow property / unit: Mass / kg
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_waste. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_waste
• Sources: urenco-environment; ea-nuclear-environment

Wastewater (wastewater)

Conditional actual stream only; preserve specific physical identity, composition, compartment and receiver. UUID remains unresolved; no substitute and no assumed zero.

• Selected flow: Uranium-bearing aqueous effluent transferred to off-site licensed treatment
• Flow property / unit: Mass / kg
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_waste. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_waste
• Sources: urenco-environment; ea-nuclear-environment

Elementary flows

Co2 fossil (co2_fossil)

Conditional fossil CO2 crossing to non-urban outdoor air or high-stack air from site-owned auxiliary combustion. Preserve biogenic CO2 separately if actually present. Do not count purchased-electricity emissions again as direct site emissions.

• Selected flow: carbon dioxide (fossil) 08a91e70-3ddc-11dd-9c13-0050c2490048
• Flow property / unit: Mass / kg
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_air. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_air
• Sources: urenco-environment

Hf air (hf_air)

Only measured hydrogen fluoride discharged to outdoor air, unspecified subcompartment. This is molecular HF mass, not fluoride ion, elemental fluorine or all fluorinated gases. Retained or treated material is not an atmospheric release.

• Selected flow: hydrogen fluoride 08a91e70-3ddc-11dd-9804-0050c2490048
• Flow property / unit: Mass / kg
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_air. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_air
• Sources: ea-nuclear-environment; jrc-cww-bat2

No2 air (no2_air)

Conditional separately speciated nitrogen dioxide to outdoor air, unspecified. Aggregate NOx is not this species; NO2-equivalent totals need separate quantity-definition review. Exclude N2O and avoid double counting NO/NO2 with NOx.

• Selected flow: nitrogen dioxide 08a91e70-3ddc-11dd-96e5-0050c2490048
• Flow property / unit: Mass / kg
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_air. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_air
• Sources: ea-nuclear-environment; jrc-cww-bat2

U234 air (u234_air)

Only individually measured U-234 activity discharged to outdoor air, unspecified; no total-alpha substitution.

• Selected flow: uranium-234 4d9a8790-3ddd-11dd-8daf-0050c2490048
• Flow property / unit: Radioactivity / Bq
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_radio. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_radio
• Sources: ea-nuclear-environment; jrc-cww-bat2

U235 air (u235_air)

Only individually measured U-235 activity discharged to outdoor air, unspecified; no total-alpha substitution.

• Selected flow: uranium-235 08a91e70-3ddc-11dd-9c3c-0050c2490048
• Flow property / unit: Radioactivity / Bq
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_radio. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_radio
• Sources: ea-nuclear-environment; jrc-cww-bat2

U238 air (u238_air)

Conditional individually analysed U-238 activity discharged to outdoor air, unspecified. The full native record and same-UUID official JRC definition support uranium-238 and Radioactivity/kBq. The official Chinese display 铀α is broader translation debt, not a total-alpha-only restriction. Require isotope-specific analytical records, activity reference date and uncertainty; no total-alpha, total-U, dose or mass substitution. Future sampling is a dataset obligation, not a verified current observation.

• Selected flow: uranium-238 08a91e70-3ddc-11dd-9c44-0050c2490048
• Flow property / unit: Radioactivity / Bq
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_radio. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_radio
• Sources: ea-nuclear-environment; jrc-cww-bat2

U234 water (u234_water)

Only individually measured U-234 activity actually reaching freshwater; no off-site wastewater-transfer activity here.

• Selected flow: uranium-234 fe0acd60-3ddc-11dd-ae3f-0050c2490048
• Flow property / unit: Radioactivity / Bq
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_radio. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_radio
• Sources: ea-nuclear-environment; jrc-cww-bat2

U235 water (u235_water)

Only individually measured U-235 activity actually reaching freshwater; no off-site wastewater-transfer activity here.

• Selected flow: uranium-235 08a91e70-3ddc-11dd-9c40-0050c2490048
• Flow property / unit: Radioactivity / Bq
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_radio. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_radio
• Sources: ea-nuclear-environment; jrc-cww-bat2

U238 water (u238_water)

Conditional individually analysed U-238 activity actually reaching freshwater; exclude off-site wastewater transfers. The full native record and same-UUID official JRC definition support uranium-238 and Radioactivity/kBq. The official Chinese display 铀α is broader translation debt, not a total-alpha-only restriction. Require isotope-specific analytical records, activity reference date and uncertainty; no total-alpha, total-U, dose or mass substitution. Future sampling is a dataset obligation, not a verified current observation.

• Selected flow: uranium-238 4d9a8790-3ddd-11dd-8db4-0050c2490048
• Flow property / unit: Radioactivity / Bq
• Amount rule: Use independently collected attributable period amount divided by D from cp_product; retain original records through cp_radio. No default amount.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_radio
• Sources: ea-nuclear-environment; jrc-cww-bat2

7. Allocation and Co-product Handling

• physical_and_burden_ledgers: Keep an independently measured physical ledger for feed, accepted product, depleted material, waste, discharge and changes in stocks. Preserve each physical co-output in full before allocating environmental burdens; multiplying its actual mass by an allocation share would corrupt the physical account. Do not derive output, yield, purification loss or a recipe from assumed balances.
• allocation_decision: Avoid allocation through actual collection subdivision where feasible, consistent with the general product GHG hierarchy (ghg-product-allocation, chapter9, p.63). For inseparable joint burdens, require a documented physical causal relation; otherwise justify and independently review another relationship, including actual economic evidence if used. This is an authored adaptation for LCI, not a nuclear-specific allocation standard. No default split, work-unit equation, isotope balance or substitution credit is supplied.
• tails_fate: Distinguish retained tails, usable co-product and waste using actual acceptance, owner and receiver records. Include attributable storage and eventual-management coverage or disclose omissions; storage does not prove avoided production. Retained material is closing physical stock, not an external product or waste transfer; production and later dispatch are different events. External product/waste transfers are distinct from environmental release.
• period_burden_carryover: Preserve lot-linked opening/closing stocks and their carried environmental burdens separately from physical quantities. For the accepted lots counted in D, reconcile prior-period burdens brought forward, current-period attributable burdens and burdens retained for future lots. Earlier production must not be charged again merely on later dispatch; current-period site totals must not all be assigned to dispatch of opening stocks. Storage, shared services and returned/reworked lots need actual scope and allocation evidence. Disclose an unreconciled carryover rather than treating stocks as burden-free.

8. Foreground Data Collection, Calculation, and Quality Rules

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_product	civil_environment	civil_uf6	Weighing and acceptance	Lot/SKU; civil specification; certificate; gross/tare/net whole compound mass; UF6 portion/impurity basis; elemental-U mass and isotope-fraction convention; grade verification state; opening/closing lot stock; returns; carried burdens; date	Calibrated weighing and traceable acceptance; exclude container tare; verify actual compound and origin; Aggregation calculation: D = sum of accepted net UF6 output in kg for the declared product gate and lot cohort; exclude tare and duplicate acceptance/redispatch; reconcile returns and opening/closing stocks with carried burdens; reference output is 1 kg	kg	Each accepted lot	Same declared inventory period	Selected producer gate only	per 1 kg reference flow	Scale calibration; signed acceptance; certificate; uncertainty
cp_feed	civil_environment	natural_feed	Supplier and receipt record	Lot/provider; natural origin; actual UF6 composition; net whole compound mass; stocks; upstream gate	Independently measured receipt and certificate reconciliation, no recipe or default ratio; Aggregation calculation: Net attributable feed / D; cancel internal transfers once	kg	Each receipt	Same period as D	Selected boundary	per 1 kg reference flow	Supplier evidence; traceable scales; compatible background
cp_electricity	civil_environment	electricity	Meter record	Meter readings; time intervals and power profile where needed; voltage; contract/provider; geography/period; meter coverage; shared services; energy returns	Calibrated meter reconciliation; verify actual supply mix and gate; Aggregation calculation: Attributable supplied energy / D; verified kWh-to-MJ conversion only	MJ	Meter intervals	Same period as D	Site scopes with actual shared-service separation	per 1 kg reference flow	Meter calibration; invoices; shared-site separation
cp_gas	civil_environment	natural_gas	Gas meter and supplier record	Volume; temperature; pressure; dry/wet basis; composition; compressibility; provider volume convention	Calibrated meter and supplier reconciliation at compatible conditions; Aggregation calculation: Compatible attributable supplied volume / D; incompatible definition remains pending	m3	Meter intervals	Same period as D	Actual auxiliary supply	per 1 kg reference flow	Meter certificate; provider quantity definition
cp_water	civil_environment	supply_water	Water meter/receipt	Source/provider; volume/mass; density evidence and conditions; withdrawals/returns/recycle/stocks	Meter or weighing; source-specific reconciliation and supported conversion; Aggregation calculation: Attributable supply mass / D; internal circulation not counted as new supply	kg	Meter intervals	Same period as D	Actual supply and fate	per 1 kg reference flow	Calibration; density evidence; source and fate
cp_coproduct	civil_environment	depleted_uf6	Output and storage record	Whole UF6 net mass; certificate; physical state; ownership; retained stock; receiver/use; legal status	Independently measured output and stock/receiver reconciliation; no output ratio inference; Aggregation calculation: Full measured external product transfer / D; retain on-site production and opening/closing stocks separately; burden allocation recorded separately	kg	Each output/stock closure	Same period as D	Selected gate and disclosed storage	per 1 kg reference flow	Scale; certificate; actual product use or waste status
cp_waste	civil_environment	spent_filter; wastewater	Waste consignment	Individual row_id; material/aqueous composition; contamination; radionuclide identity/activity; mass; receiver; treatment boundary	Weigh or use volume with supported density; reconcile licensed transfer records per atomic stream; Aggregation calculation: Each actual stream mass / D; no subtraction of unmeasured contaminants	kg	Each consignment	Same period as D	Transfer gate; downstream treatment separately declared	per 1 kg reference flow	Waste classification; consignment; receiver acceptance; analytical limits
cp_air	civil_environment	co2_fossil; hf_air; no2_air	Species-specific monitoring	Individual species; origin; outlet; medium; quantity basis; sampling/flow intervals; detection limit; uncertainty	Validated site environmental monitoring and compatible concentration/flow integration; preserve raw measured totals and method; Aggregation calculation: Each actual species release mass / D; exclude internal recapture and duplicate aggregate totals	kg	Monitoring intervals and reporting closure	Same period as D	Actual releases leaving site, not workplace concentrations	per 1 kg reference flow	Laboratory accreditation; calibrated monitor; permit method and uncertainty
cp_radio	civil_environment	u234_air; u235_air; u238_air; u234_water; u235_water; u238_water	Isotope-specific release monitoring	Individual isotope; medium/receiver; activity; unit; reference date; sample timing; discharge volume/flow; nondetects; uncertainty	Approved environmental laboratory method and measured discharge; isotope-specific assay; retain time/decay basis and non-detect treatment; Aggregation calculation: Each isotope/medium activity / D; no total-alpha disaggregation or duplicate transfer/release	Bq	Monitoring intervals and reporting closure	Same period as D	Actual atmospheric or freshwater discharge	per 1 kg reference flow	Laboratory method; detection limits; reference date; no assumed equilibrium

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
normalization	all inventory rows	Physical exchange = independently collected boundary amount / D; preserve unallocated physical totals and stock changes. D is accepted whole UF6 output in kg for the cp_product gate/cohort. Compute the product environmental inventory separately from evidence-backed attributable/allocated burdens and lot-matched stock carryover / D. Allocated inventory cannot be used as the physical balance or to rescale paired physical transfers.	cp_product; row-specific protocol	per 1 kg reference flow
quantity_reconciliation	all inventory rows	Reconcile whole-compound mass, water, stocks and external transfers using independent records; preserve elemental-U assays, isotope fractions and activity as separate descriptors. No default purity, moisture, formulation, purification yield, enrichment work or activity-to-mass conversion. Obtain any actual conversion from a validated lab/provider method with scope and uncertainty.	Actual scales/meters, certificates and laboratory records	Reconciliation residuals and uncertainty, separately from allocated burdens
physical_conservation	actual boundary register	Reconcile opening stock plus all external physical inflows against closing stock plus all external physical outflows, including wet air, water, retained material, containers and returns. For total mass and conserved elements, chemical reactions do not add sources or sinks. Species accounting may record evidenced chemical formation/consumption on the same scope, without authoring reaction recipes or operational parameters. Keep residuals and measurement uncertainty; do not infer missing process quantities to force closure.	Full physical register; independent quantity/composition records	Unallocated mass/element/species reconciliation with explicit scope
ledger_separation	site, services and product inventory	Preserve the complete site physical and energy records, matched internal-link endpoints and retained stocks. Keep service quantities, upstream background inventories and allocated product burdens in separate ledgers with explicit cross-references; prevent double counting and reconcile period/cohort coverage.	Meter/transfer/stock records; supplier services; allocation evidence	Traceable physical records and separately derived product inventory

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
identity_gate	Product and providers	Verify actual single compound, civil specification, feed origin, product state and compatible net whole-UF6 basis; broad UUID is not a generic provider or composition default	Lot acceptance and source-specific background
monitoring_scope	All environmental streams	Review actual permits and physical environmental outlets; separate radionuclide species and media. Chemical toxicity mass, radioactive activity and dose are different quantities. Do not invent equilibrium or generic removal performance	Site monitoring plan and accredited analyses
conditional_completeness	All cards and actual additional flows	Document present/absent/unknown status and complete atomic site inventory before dataset completion; unidentified material or unmeasured release is pending, not zero	Full stream register, permit coverage and uncertainty
source_limits	External evidence	Manufacturer environmental reporting is site/group evidence, not universal quantity; CWW is analogous inventory management only; English permit context is not a global legal or radiological certificate	Source scope and field records

9. Validation Rules

• check_reference: Exactly one enriched product output links civil_uf6 to 1 kg net accepted whole compound. Natural/depleted UF6, container mass, uranium-content mass, activity and work units cannot share that reference denominator without an explicit validated conversion and applicability review.
• check_environment: Verify each actual atomic flow's type, species, origin, compartment, reference property/unit and compatible provider. Reconcile product/waste/environmental fates, wet air/water, energy, packing/containers, maintenance, returns and stocks. Distinguish retained contamination from actual environmental release. Do not allocate physical output masses; internal links must agree in identity, property, unit, amount and period at both ends. Reconcile stock-carried burdens and service/background links separately from physical conservation.
• check_completeness: A completed dataset requires positive independently measured D, compatible upstream data, full actual environmental-stream register, source-specific isotope reporting, evidence-backed allocation and uncertainty. Empty UUIDs, unknown quantity bases, untreated coverage gaps or missing monitoring are explicit pending items; a structural PCR check is not dataset completion, permit compliance or independent scientific approval.

10. Published Dataset Profile

Field	Value
dataset_role	Foreground environmental inventory for a declared civil conventional UF6 supply boundary
downstream_use	secondary_dataset; background_dataset only after dataset-level completeness and independent applicability review
allowed_use	Public civil environmental accounting with the declared product, provider, gate, quantities and uncertainty
excluded_use	Enrichment/separation/fabrication operating instructions; weapon-material production or optimization; plutonium; excluded product grades; reactor dose/safety claims; automatic comparison of different chemical or isotope bases
required_metadata	Required qualifiers; D and period; upstream coverage; storage and waste fates; allocation evidence; individual species/medium and activity reference date
required_quality_disclosure	Authored candidate; independent review pending; unresolved identities; monitoring/detection limits; provider quantity compatibility; missing stages and uncertainty
update_trigger	Different product/feed history/state, supplier boundary, environmental outlets, provider basis, monitoring method or reviewed identity correction

11. Data Sources

Source id	Type	Reference	Used for
urenco-civil-product	official_guidance	Urenco, Our role in nuclear fuel; https://www.urenco.com/about/nuclear-fuel-cycle ; product delivery and weighing passages, snapshot2026-10-13	Real civil supplied UF6 state and weighing context only; no operational descriptions or manufacturing quantities adopted
urenco-environment	official_guidance	Urenco, Environmental Impact; https://www.urenco.com/sustainability/environmental-impact ; scope1/2/3, environmental/waste monitoring passages, snapshot2026-10-13	Producer environmental accounting domains; company statements are not universal factors or product allocation data
ea-nuclear-environment	official_guidance	Environment Agency, Nuclear sites: environmental regulation; https://www.gov.uk/guidance/nuclear-sites-environmental-regulation ; environmental permits and monitoring sections	England-specific nuclear environmental scope; distinguish radioactive waste and air/water discharge, not a global permit or isotope emission factor
jrc-cww-bat2	official_guidance	European Commission JRC, CWW BREF2016; https://publications.jrc.ec.europa.eu/repository/bitstream/JRC103096/jrc103096_cww_bref_10_2016.pdf ; BAT2(II–III), printed543/PDF573	Analogous stream-characterization and pollutant-load recording for chemical environmental inventories only; no nuclear BAT applicability, numerical limit, recipe or operating chemistry transfer
ghg-product-allocation	standard	WRI/WBCSD, Product Life Cycle Accounting and Reporting Standard2011; https://ghgprotocol.org/sites/default/files/standards/Product-Life-Cycle-Accounting-Reporting-Standard_041613.pdf ; chapter9, tables9.1–9.2, printed63/PDF65	General GHG product allocation hierarchy; authored adaptation to LCI explicitly limited, not nuclear methodology approval