Parts of the goods of subclass 42310

1. Scope and Applicability

This PCR covers finished physical parts identifiable as being solely or principally for nuclear reactors, including reactor internal and pressure-boundary parts delivered as accepted components. It applies to cradle-to-gate foreground manufacture from receipt of qualified material or a qualified preform through shaping, machining, applicable thermal operations, cleaning, inspection, testing, acceptance and release at the manufacturer's gate.

The category excludes complete nuclear reactors; non-irradiated and spent fuel elements; parts of non-irradiated fuel elements; isotope-separation equipment; steam generators and boiler auxiliaries; generic fasteners, valves, pumps, instruments or structural products not demonstrably dedicated to a nuclear-reactor application; installation at the reactor site; operation, maintenance and decommissioning. CPC 3.0 identifies subclass 42310 as nuclear reactors and subclass 42341 as parts of those goods. The Chinese product terminology is rendered literally as 子类42310所列货物的零件 and described in ordinary technical language as 核反应堆零件, consistent with official Chinese tariff terminology for the corresponding HS 8401 family.

The representative route is manufacture of an accepted low-alloy-steel reactor part from a qualified forging. A dataset for another covered material or fabrication route shall replace the representative material input with each actual bill-of-material flow as a separate atomic exchange and shall declare all route-specific operations; it shall not aggregate different materials, fuels, chemicals, wastes or emissions into collection labels.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.fabricated-metal-products-except-machinery-and-equipment.parts-of-the-goods-of-subclass-42310
classification_refs	CPC 3.0: 42341, Parts of the goods of subclass 42310 (exact semantic relation; mapping acceptance is maintained separately)
covered_products	Finished nuclear-reactor parts with a declared reactor application, component designation, material specification, manufacturing route and acceptance status
excluded_products	Complete reactors; nuclear fuel elements and their parts; isotope-separation equipment; boiler or steam-generator parts; undedicated general-purpose goods; site installation, use, maintenance and end-of-life services
representative_product	Accepted low-alloy-steel nuclear-reactor part manufactured from a qualified forging
production_route	Qualified forging receipt; material verification; shaping and machining; conditional thermal cutting or heat treatment; conditional alkaline cleaning; non-destructive examination, dimensional inspection, acceptance and release
market_state	Finished, clean, inspected, accepted and documented part at the manufacturer's gate, excluding transport packaging and installation fixtures

3. Reference Flow

Field	Value
What	A finished nuclear-reactor part that performs its declared structural, pressure-boundary, support, alignment or reactor-internal function
How much	1 kg net mass of accepted finished part
How well	Conforms to the declared drawing revision, material specification, safety classification, dimensional and other critical-characteristic acceptance criteria, with complete manufacturing and inspection traceability
How long or cycle	One completed manufacturing and acceptance cycle; service life and reactor operation are outside this cradle-to-gate reference
reference_flow_link	The accepted net product mass reported by final_reactor_part is normalized to exactly 1 kg

Field	Value
Reference amount	1 kg
Reference product flow	Finished nuclear-reactor part (Tiangong UUID unresolved)
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	part designation and drawing revision; reactor type and intended application; safety class or declared non-safety classification; material grade and forging specification; manufacturing route and special-process status; acceptance criteria and release status; net-mass basis; manufacturing site, geography and reference period

When constructing a foreground data package, the items listed in Required qualifiers must be declared in dataset metadata, process notes, reference flow comment, product description, or an equivalent data package field. Missing required qualifiers make the reference flow definition incomplete for that data package.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_net_mass	reference product and mass-normalized inventory	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Use accepted net part mass after final cleaning and inspection. Exclude transport packaging, temporary fixtures, test media and rejected parts from the reference amount.
electricity_energy_conversion	all electricity rows	Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66	MJ	Preserve meter readings and the electricity supply context. Convert kWh to MJ using the exact identity 1 kWh = 3.6 MJ and disclose the conversion.
gas_reference_conditions	natural gas and industrial oxygen	Volume 93a60a56-a3c8-22da-a746-0800200b9a66	m3	Record metered volume and declare pressure, temperature and dry/wet basis. Do not compare or aggregate volumes reported at incompatible reference conditions.
water_mass_conversion	process-water rows	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Prefer measured mass. If only volume is metered, retain the volume record and document the density and reference conditions used to calculate mass.
material_balance_basis	forging, accepted product and machining scrap	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Use the same calibrated mass basis and reporting period for received forging, accepted product and low-alloy machining chips; document any other retained, recycled internally or disposed solid material.

5. System Boundary

The foreground boundary begins when the qualified low-alloy steel forging is accepted at the component manufacturer's gate. It ends when the finished nuclear-reactor part has passed the declared inspection and acceptance plan and is released at the same manufacturer's gate. Upstream production of the forging, purchased energy, gases, water and chemicals is represented by linked background datasets. The foreground includes on-site shaping, machining, applicable thermal operations, cleaning, direct releases, waste generation, non-destructive examination, hydrostatic testing when required, final acceptance and the share of common services physically attributable to the part.

Boundary Abstraction

Field	Value
declared_starting_condition	Qualified low-alloy steel forging received with material identity, heat or lot traceability, specification, mass and acceptance evidence
starting_condition_role	Purchased product input and cradle-to-gate foreground starting point
product_classification_scope	Finished physical parts solely or principally for nuclear reactors; CPC 3.0 42341 is the reviewed exact classification reference
recursive_input_rule	A purchased nuclear-reactor subpart within the same semantic category is recorded once as an individual product input with its own upstream dataset; its manufacture is not recursively reconstructed inside this foreground package
upstream_dataset_requirement	Each purchased material, electricity, gas, water and chemical flow requires a geographically, technologically and temporally representative upstream dataset with matching product state and unit
disclosure	Declare the part designation, material and safety classification, included and excluded unit operations, outsourced operations, allocation choices, direct-emission basis, waste destinations and whether any same-category subpart enters the boundary

Boundary Rules

rule_id	Applies to	Rule	source_ids
boundary_factory_gate	foreground system	Include manufacturing and acceptance from receipt of a qualified preform through release of the accepted finished part; exclude reactor-site installation, reactor operation, maintenance and decommissioning.	un-cpc-3-0-structure-2025; iaea-tecdoc-2034; iaea-pub2068
boundary_special_processes	shaping, machining, welding, forming, cladding, heat treatment, surface treatment and non-destructive testing when performed	Declare every applicable special process, its site or supplier, qualification status and acceptance evidence. Omission is permitted only with an explicit not-applicable justification for the selected part and route.	iaea-tecdoc-2034; iaea-pub2068
boundary_company_specific	bill of materials and foreground manufacturing	Collect company-specific bill-of-material, energy, consumable, waste and direct-emission data for the product and manufacturing processes in scope.	eu-pef-2021-2279

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
material_shaping	Material verification, shaping and machining	required	Always for the representative low-alloy-steel forging route	Foreground material conversion	Per 1 kg accepted finished part
thermal_operations	Thermal cutting and on-site heat treatment	conditional	Include when thermal cutting or a fuel- or electricity-consuming heat-treatment operation is performed within the foreground boundary	Foreground special process	Per 1 kg accepted finished part
alkaline_cleaning	Sodium-hydroxide alkaline cleaning	conditional	Include when an aqueous sodium-hydroxide cleaning bath is used within the foreground boundary	Foreground surface preparation	Per 1 kg accepted finished part
inspection_acceptance	Non-destructive examination, hydrostatic testing, final inspection and release	required	Always; operations not required by the declared acceptance plan are identified as not applicable	Foreground quality control and reference-product release	Per 1 kg accepted finished part

Process: Material verification, shaping and machining (material_shaping)

Inputs

Product flows

Qualified low-alloy steel forging (low_alloy_steel_forging)

Record the qualified low-alloy steel forging that crosses the factory-gate boundary for the representative route. Retain the material grade, heat or lot, forged delivery state, certificate, received mass and acceptance result.

• Selected flow: Low-alloy steel forging (Tiangong UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: measured accepted mass of the qualified forging consumed for the declared accepted part output
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_bom
• Sources: iaea-tecdoc-2034; iaea-pub2068; eu-pef-2021-2279

Electricity for shaping and machining (shaping_electricity)

Record purchased electricity metered or physically allocated to material verification equipment, forming, cutting, machining, grinding and chip handling in this process.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: metered electricity or physically allocated electricity for the process
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_electricity
• Sources: eu-pef-2021-2279

Process water for shaping and machining (shaping_process_water)

Record process water that crosses the boundary for machining, grinding, rinsing or leak-control activities in this process. Exclude closed-loop water that does not cross the process boundary.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass / kg
• Amount rule: measured make-up and once-through process water entering this process
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_water
• Sources: eu-pef-2021-2279

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Low-alloy steel machining chips (low_alloy_machining_scrap)

Record separated low-alloy steel chips and turnings leaving this process for recycling, treatment or disposal. Do not combine them with stainless steel, non-ferrous metal, grinding sludge or mixed shop waste.

• Selected flow: Steel scrap, low-alloyed (machining chips), at plant 826431d5-0492-4345-9051-8342d1f6c4d5
• Flow property / unit: Mass / kg
• Amount rule: measured mass of low-alloy steel machining chips leaving the process
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_waste
• Sources: eu-pef-2021-2279

Elementary flows

Direct particulate matter from shaping (shaping_particulate_to_air)

Record measured particulate matter released directly to air after installed capture or control equipment. Do not include particulate emissions already contained in upstream electricity or material datasets.

• Selected flow: Particulate matter, particle size unspecified 0ce3dedb-caca-407b-a856-a90470eb8ec0
• Flow property / unit: Mass / kg
• Amount rule: measured or permit-inventory mass emitted directly from shaping and machining to unspecified air
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_direct_emissions
• Sources: eu-pef-2021-2279

Process: Thermal cutting and on-site heat treatment (thermal_operations)

Inputs

Product flows

Electricity for thermal operations (thermal_electricity)

Record electricity used by thermal cutting, resistance heating, furnace auxiliaries, controls and material handling when this conditional process is included.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: metered electricity or physically allocated electricity for included thermal operations
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_electricity
• Sources: iaea-tecdoc-2034; eu-pef-2021-2279

Gaseous natural gas for on-site heating (thermal_natural_gas)

Record gaseous natural gas entering on-site furnaces or burners for the included thermal operation. Declare composition, supply geography and volume reference conditions.

• Selected flow: natural gas in the gaseous state 4f19ca0e-7b3b-11dd-ad8b-0800200c9a66
• Flow property / unit: Volume / m3
• Amount rule: metered gaseous natural gas delivered to the included furnace or burner
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_fuel_gas
• Sources: iaea-pub2068; eu-pef-2021-2279

Industrial oxygen for thermal cutting (cutting_oxygen)

Record industrial oxygen supplied to an oxygen-fuel cutting operation when that route is performed. Purity, pressure, supply mode and reference conditions remain foreground qualifiers.

• Selected flow: Industrial oxygen bd4b0f96-2090-4806-a648-335ab20ff401
• Flow property / unit: Volume / m3
• Amount rule: metered or supplier-invoiced industrial oxygen consumed by thermal cutting
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_process_gas
• Sources: iaea-pub2068; eu-pef-2021-2279

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Elementary flows

Direct fossil carbon dioxide from on-site natural gas (thermal_fossil_co2)

Record only direct fossil carbon dioxide released by on-site natural-gas combustion in this process. Upstream electricity and fuel-supply emissions remain in their linked background datasets.

• Selected flow: carbon dioxide (fossil) 08a91e70-3ddc-11dd-923d-0050c2490048
• Flow property / unit: Mass / kg
• Amount rule: measured or site emissions-inventory mass of direct fossil carbon dioxide from the included on-site burner
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_direct_emissions
• Sources: eu-pef-2021-2279

Process: Sodium-hydroxide alkaline cleaning (alkaline_cleaning)

Inputs

Product flows

Electricity for alkaline cleaning (cleaning_electricity)

Record electricity used by bath heating, circulation, filtration, ventilation and material handling when this conditional cleaning process is included.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: metered electricity or physically allocated electricity for the alkaline-cleaning process
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_electricity
• Sources: eu-pef-2021-2279

Process water for alkaline cleaning (cleaning_process_water)

Record process water used to make up the sodium-hydroxide bath and for associated rinsing. Exclude water recirculated internally without crossing the boundary.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass / kg
• Amount rule: measured make-up and rinse water entering the included alkaline-cleaning process
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_water
• Sources: eu-pef-2021-2279

Sodium hydroxide for alkaline cleaning (cleaning_sodium_hydroxide)

Record the mass of sodium hydroxide product added to the cleaning bath. Declare product state and solution concentration; report sodium-hydroxide mass separately from total solution mass.

• Selected flow: Sodium hydroxide e0abcced-0611-4c24-9290-5a2c5a0c4169
• Flow property / unit: Mass / kg
• Amount rule: supplier-invoiced or batch-record mass of sodium hydroxide added to the bath
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_process_chemical
• Sources: eu-pef-2021-2279

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Spent alkaline cleaning liquor (waste_alkaline_liquor)

Record the spent sodium-hydroxide cleaning bath when it leaves the process for treatment or disposal. Retain pH, sodium-hydroxide origin, principal contaminants, hazardous classification and destination as foreground qualifiers.

• Selected flow: Waste Alkaline Liquor ce738ef0-a711-4650-a38b-34479efd7559
• Flow property / unit: Mass / kg
• Amount rule: measured mass of waste alkaline liquor leaving the included cleaning process
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_waste
• Sources: eu-pef-2021-2279

Elementary flows

Process: Non-destructive examination, hydrostatic testing, final inspection and release (inspection_acceptance)

Inputs

Product flows

Electricity for inspection and acceptance (acceptance_electricity)

Record electricity used by non-destructive examination, dimensional inspection, hydrostatic-test equipment, controls and final acceptance activities within the foreground boundary.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: metered electricity or physically allocated electricity for inspection and acceptance
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_electricity
• Sources: iaea-tecdoc-2034; iaea-pub2068; eu-pef-2021-2279

Process water for hydrostatic testing (hydrotest_process_water)

Record process water added for hydrostatic testing when the declared acceptance plan requires that test. Water reused without crossing the boundary is not counted again.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass / kg
• Amount rule: measured make-up water entering the hydrostatic test system
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_water
• Sources: iaea-tecdoc-2034; iaea-pub2068; eu-pef-2021-2279

Waste flows

Elementary flows

Outputs

Product flows

Accepted finished nuclear-reactor part (final_reactor_part)

Record only product mass released after the declared critical characteristics, inspection status and manufacturing records satisfy the acceptance plan. Rejected or unreleased parts are not reference product.

• Selected flow: Finished nuclear-reactor part (Tiangong UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: exactly 1 kg after normalizing the collected accepted net product mass
• Value mode: Calculated value (calculated_value)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished nuclear-reactor part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_accepted_output
• Sources: un-cpc-3-0-structure-2025; iaea-tecdoc-2034; iaea-pub2068

Waste flows

Elementary flows

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
allocation_subdivide_first	shared or multifunctional manufacturing processes	Avoid allocation by subdividing processes or meters so inputs, wastes and direct emissions are assigned to the part and unit operation that caused them.	eu-pef-2021-2279
allocation_physical_driver	common electricity, gas, water, consumables, waste treatment and emissions	When subdivision is not feasible, use a documented causal physical driver such as machine time, metered energy, treated mass or bath loading. Economic allocation is permitted only after subdivision and physical relationships are shown infeasible and the justification is disclosed.	eu-pef-2021-2279
allocation_scrap_separate_output	low-alloy machining chips and other recovered material	Record the actual scrap as a separate waste output at the factory gate. Do not silently subtract its mass, sale revenue or an avoided-primary-material credit from the foreground burdens; any recycling allocation belongs to the declared downstream LCA method.	eu-pef-2021-2279
allocation_rework_and_rejects	rework, rejected parts and destructive-test specimens	Assign measured rework and reject burdens to accepted output from the same reporting period unless a physically separate product system is demonstrated. Disclose excluded abnormal-event campaigns separately.	eu-pef-2021-2279; iaea-tecdoc-2034

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_material_bom	material_shaping	qualified forging input	receiving record, bill of material and material certificate	part_id; drawing_revision; heat_or_lot; material_grade; product_state; received_mass_kg; accepted_mass_kg; certificate_id	reconcile receiving scale data, BOM issues and certificate traceability to the accepted part lot	kg	per receipt and production lot	complete declared reference period	all sites supplying the foreground part	sum accepted forging mass consumed; subtract only documented returns that leave unused	calibrated scale record; certificate; material acceptance and traceability record
cp_electricity	all included processes	process electricity	revenue meter, submeter or equipment energy record	meter_id; process_id; start_reading; end_reading; unit; allocation_driver; accepted_output_kg	prefer process submetering; otherwise physically allocate a common meter using a documented causal driver	kWh and MJ	per batch or monthly	at least 12 consecutive representative months, or the complete campaign for one-off manufacture	all foreground manufacturing and acceptance sites	sum by process and convert kWh to MJ before normalization	meter calibration; bills; allocation worksheet; outage and anomaly log
cp_water	material_shaping; alkaline_cleaning; inspection_acceptance	process-water input	meter, tank or batch record	source; process_id; volume_or_mass; unit; density; reference_conditions; reuse_volume; discharge_destination	measure boundary-crossing make-up and once-through water; exclude internal recirculation from repeated counting	kg, with original m3 retained when applicable	per batch or monthly	same period as accepted output	all foreground sites using water	sum net boundary input by process and normalize	meter calibration; batch sheet; density or conversion record; water balance
cp_fuel_gas	thermal_operations	natural-gas input	gas meter or supplier invoice	meter_id; volume_m3; pressure; temperature; dry_wet_basis; composition; process_share	meter gas delivered to included burners or physically allocate a common meter	m3	per batch or monthly	same period as accepted output	included foreground furnaces and burners	sum at a common declared reference condition and normalize	calibrated meter; invoice reconciliation; allocation worksheet
cp_process_gas	thermal_operations	industrial-oxygen input	cylinder, bulk-tank or flowmeter record	supplier; purity; delivery_mode; volume_m3; pressure; temperature; process_id	reconcile supplier deliveries and stock change or use a calibrated process flowmeter	m3	per batch or delivery period	same period as accepted output	included thermal-cutting operations	deliveries plus opening stock minus closing stock, allocated to the process and normalized	invoices; stock record; meter calibration; reference-condition record
cp_process_chemical	alkaline_cleaning	sodium-hydroxide input	batch formulation and purchasing record	product_state; concentration; solution_mass_kg; sodium_hydroxide_mass_kg; bath_id; additions; carryover	calculate pure sodium-hydroxide product mass from verified product concentration and batch additions	kg	per bath and batch	same period as accepted output	included alkaline-cleaning lines	sum sodium-hydroxide mass, not total solution mass, and normalize	safety data sheet; certificate; calibrated scale; batch sheet; concentration check
cp_waste	material_shaping; alkaline_cleaning	separated machining chips or waste alkaline liquor	weighbridge, container scale and waste manifest	row_id; waste_identity; mass_kg; container_tare; date; destination; hazardous_classification; pH_or_contaminants	weigh each separated waste stream before off-site transfer; subtract container tare	kg	per container or shipment	same period as accepted output	all foreground waste collection points	sum by atomic waste identity and destination and normalize	calibrated scale; waste manifest; composition or pH evidence; destination receipt
cp_direct_emissions	material_shaping; thermal_operations	direct particulate matter or fossil carbon dioxide	stack test, continuous monitor or regulated site emissions inventory	flow_identity; source_id; concentration; flow_rate; operating_time; measured_mass_kg; control_status; method	use source-specific measurements where available; otherwise use the site's documented emissions inventory without importing upstream emissions	kg	per monitoring event with period aggregation	same period as accepted output and representative operating conditions	all direct foreground emission points	aggregate by elementary-flow identity and source, then normalize	method report; calibration; operating log; control-equipment status; emissions inventory reconciliation
cp_accepted_output	inspection_acceptance	accepted finished part	production release and inspection dossier	part_id; drawing_revision; material_heat_or_lot; safety_class; acceptance_plan; inspection_results; release_status; net_mass_kg; release_date	weigh accepted clean part and reconcile identity to the released manufacturing dossier	kg	per released part or lot	complete declared reference period	all foreground release points	sum only accepted released net mass; use as normalization denominator	calibrated scale; material traceability; inspection and test records; signed release record

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
calc_reference_normalization	every inventory row	normalized amount = reporting-period row amount / reporting-period accepted net product mass	atomic flow amount; accepted net product mass from cp_accepted_output	amount per 1 kg accepted finished part	eu-pef-2021-2279
calc_electricity_mj	electricity rows	electricity_MJ = metered_kWh × 3.6	metered or allocated kWh	electricity in MJ before reference-flow normalization
calc_material_reconciliation	forging, accepted product and solid material outputs	received forging mass = accepted product mass + separated machining-chip mass + other explicitly documented solid destinations ± verified stock change	cp_material_bom; cp_waste; cp_accepted_output	reconciled material balance and unexplained difference	eu-pef-2021-2279
calc_shared_resource_allocation	common meters and shared treatment	assign only the measured common total using a causal physical driver; preserve total conservation across products	common-meter total; machine time, metered energy, treated mass or bath loading by product	product-specific allocated amount and disclosed driver	eu-pef-2021-2279

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_product_identity	reference product	Preserve part designation, drawing revision, reactor application, safety class, material heat or lot and accepted release status through all records.	manufacturing dossier and signed release record; iaea-tecdoc-2034; iaea-pub2068
dq_special_process_traceability	all special processes	Retain operator and equipment qualification, procedure revision, process parameters, hold or witness points, inspection results and acceptance criteria for each applicable special process.	qualified procedure and personnel records; inspection and test plan; iaea-tecdoc-2034
dq_measurement	meters, scales and analytical measurements	Use calibrated equipment within its valid calibration interval and retain raw readings, units, conversions, uncertainty or resolution and anomaly disposition.	calibration certificates, raw logs and QA review
dq_temporal	foreground inventory	Cover at least 12 consecutive representative months; for one-off or long-cycle parts, cover the complete manufacturing campaign and disclose why it is representative.	production calendar, meter periods and campaign records
dq_completeness	all included processes	Reconcile BOM, energy, water, consumables, wastes, direct emissions and accepted output. No flow may be hidden in an umbrella row; omitted applicable operations or flows require an explicit gap statement.	mass and energy reconciliations, source-register review and gap log; eu-pef-2021-2279
dq_geography_technology	upstream links and shared services	Match supply geography, product state, reference conditions, technology and time period, and disclose every proxy or allocation driver.	supplier records, dataset metadata and allocation worksheet
dq_range_status	all 16 inventory rows	No external typical or QA range is prescribed because two independent original-text sources with compatible boundary, functional unit and product state were not established. Foreground collection is mandatory and the evidence needs remain unresolved in the manifest.	manifest review_metadata.unresolved.range_evidence_needs

9. Validation Rules

rule_id	Applies to	Rule	source_ids
validate_identity_and_scope	product and dataset metadata	Confirm that the output is a physical part solely or principally for a nuclear reactor and is not an excluded fuel element, boiler part, general-purpose good or service.	un-cpc-3-0-structure-2025; china-tariff-2026-nuclear-reactor-parts
validate_reference_flow	reference amount	Confirm that accepted clean net product mass is positive and every row is normalized to exactly 1 kg of accepted finished part; packaging, fixtures, test media and rejects are excluded from reference output.	eu-pef-2021-2279; iaea-tecdoc-2034
validate_uuid_property_unit	every UUID-bearing inventory row	Confirm the selected Tiangong UUID, flow type, flow property and unit group match the atomic exchange and that volume rows declare reference conditions. UUID-empty rows remain explicit unresolved findings, not proxy matches.
validate_process_route	process map and inventory	Confirm required processes are present, conditional processes match the declared route, and every applicable special process has qualification, parameter, inspection and acceptance evidence.	iaea-tecdoc-2034; iaea-pub2068
validate_inventory_completeness	foreground inventory	Confirm that each material, electricity use, gas, water, chemical, waste and direct emission is represented by an atomic row or explicitly documented as not applicable; reconcile material and shared-resource totals.	eu-pef-2021-2279
validate_allocation	multifunctional and shared operations	Confirm subdivision was attempted first, each residual allocation uses a causal physical driver, totals are conserved and any economic relation is separately justified.	eu-pef-2021-2279
validate_quality_release	final product	Confirm critical characteristics, inspection status, manufacturing traceability and release evidence are complete before counting the part as reference product.	iaea-tecdoc-2034; iaea-pub2068

10. Published Dataset Profile

Field	Value
dataset_role	Product-specific cradle-to-gate foreground dataset that may be published as a secondary_dataset or background_dataset after review
downstream_use	Nuclear-reactor construction and equipment models requiring an accepted nuclear-reactor part at the manufacturer's gate
allowed_use	Product systems matching the declared part function, material grade and state, manufacturing route, safety classification, geography, reference period and factory-gate boundary
excluded_use	Complete reactor manufacture; fuel elements; boiler or steam-generator parts; site installation; reactor operation, maintenance or decommissioning; comparison of unlike safety classes or manufacturing routes without harmonization
required_metadata	PCR id and version; part designation and drawing revision; reactor application; safety class; material grade, heat or lot and forging state; manufacturing and outsourced process route; acceptance plan and release status; site and geography; reference period; allocation and cut-off decisions; upstream dataset identities
required_quality_disclosure	Coverage and calibration of foreground records; mass and energy reconciliation; special-process and acceptance traceability; direct-emission method; waste destinations; proxy and allocation choices; unresolved UUIDs and range-evidence needs
update_trigger	Drawing, material specification, safety class, supplier, manufacturing route, site, allocation method, upstream technology, acceptance plan or representative-period change; resolution of either outstanding flow UUID; or availability of compatible independent range evidence

11. Data Sources

Source id	Type	Reference	Used for
un-cpc-3-0-structure-2025	Official guidance (official_guidance)	United Nations Statistics Division, CPC Version 3.0 Structure, 30 June 2025, hash-verified CSV: https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Structure_30Jun2025.csv (retrieved 2026-09-05)	Official CPC 42310 parent identity as nuclear reactors and CPC 42341 English classification title
china-tariff-2026-nuclear-reactor-parts	Official guidance (official_guidance)	Ministry of Finance of the People's Republic of China, 2026 tariff schedule: https://m.mof.gov.cn/zcfb/202604/P020260428407579725260.pdf (retrieved 2026-09-05)	Professional Chinese terminology for 核反应堆, 堆内构件 and 其他核反应堆零件 in the corresponding HS 8401 family
iaea-tecdoc-2034	Official guidance (official_guidance)	International Atomic Energy Agency, Suitability Evaluation of Commercial Grade Products for Use in Nuclear Power Plant Safety Systems, IAEA-TECDOC-2034, 2023, ISBN 978-92-0-153323-4: https://www-pub.iaea.org/MTCD/Publications/PDF/TE-2034web.pdf (retrieved 2026-09-05)	Critical characteristics, traceability, special-process decomposition, inspection, acceptance and manufacturing quality records
iaea-pub2068	Official guidance (official_guidance)	International Atomic Energy Agency, Project Management in the Construction of Research Reactors, IAEA Nuclear Energy Series No. NG-T-5.12, 2024: https://www-pub.iaea.org/MTCD/publications/PDF/p15232-PUB2068_web.pdf (retrieved 2026-09-05)	Material certification, fabrication inputs, staged inspection, documented acceptance and manufacturing records
eu-pef-2021-2279	Official guidance (official_guidance)	European Commission, Commission Recommendation (EU) 2021/2279 of 15 December 2021, Annex I Product Environmental Footprint Method: https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32021H2279 (retrieved 2026-09-05)	Company-specific BOM and manufacturing inventory, data collection, allocation hierarchy, data quality and disclosure