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HJ 1202-2021: (General technical requirements for the manufacture of steel spent fuel transportation containers)
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(General technical requirements for the manufacture of steel spent fuel transportation containers)
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HJ 1202-2021
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Standard similar to HJ 1202-2021 HJ 1199 HJ 1200 HJ 1198 Basic data | Standard ID | HJ 1202-2021 (HJ1202-2021) | | Description (Translated English) | (General technical requirements for the manufacture of steel spent fuel transportation containers) | | Sector / Industry | Environmental Protection Industry Standard | | Word Count Estimation | 13,145 | | Issuing agency(ies) | Ministry of Ecology and Environment | HJ 1202-2021: (General technical requirements for the manufacture of steel spent fuel transportation containers)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(General technical requirements for the manufacture of steel spent fuel transportation containers)
National Ecological Environment Standard of the People's Republic of China
General technical requirements for the manufacture of steel spent fuel transport containers
General technical requirements for fabrication of
steel spent fuel transport cask
This electronic version is the official standard text, which is reviewed and typeset by the Environmental Standards Institute of the Ministry of Ecology and Environment.
Published on 2021-11-13
2021-12-01 Implementation
Released by the Ministry of Ecology and Environment
directory
Foreword...ii
1 Scope...1
2 Normative references...1
3 Terms and Definitions...1
4 General...1
5 Material re-inspection, segmentation and logo transplantation...2
6 Forming and Assembly...2
7 Soldering...3
8 Experiments...5
9 Container Factory Requirements...7
Appendix A (Informative Appendix) Typical Steel Spent Fuel Transport Container...9
General technical requirements for the manufacture of steel spent fuel transport containers
1 Scope of application
This standard specifies the material, forming and assembling, welding and non-destructive testing, testing and
inspection, and manufacturing requirements such as container delivery.
This standard applies to the manufacture of steel spent fuel transport containers.
2 Normative references
This standard refers to the following documents or clauses thereof. For dated references, only the dated version applies to this standard.
For undated references, the latest edition (including all amendments) applies to this standard.
GB/T 1184-1996 Shape and position tolerances are not marked with tolerance values
GB/T 1804-2000 General Tolerances Unmarked Tolerances of Linear and Angular Dimensions
GB/T 15219 Quality Assurance of Radioactive Material Transport Packaging
GB/T 17230 Leak Inspection of Packages for Safe Transport of Radioactive Materials
GB/T 25778-2010 Welding consumables procurement guide
NB/T.20001-2010 Specification for the manufacture of nuclear island machinery and equipment for pressurized water reactor nuclear power plants
NB/T 20450-2017 Another specification for welding of nuclear island machinery and equipment in pressurized water reactor nuclear power plants
HAF602 Regulations on the Qualification Management of Nondestructive Examiners of Civilian Nuclear Safety Equipment
HAF603 Regulations on the Qualification Management of Welding Personnel of Civilian Nuclear Safety Equipment
NNSA-HAJ-0002-2019 Skill evaluation of welders and welding operators for civil nuclear safety equipment
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
containment boundary
The assembly of packaging components designated by the designer to contain the radioactive material is a physical barrier to prevent the loss or dispersion of the radioactive material.
3.2
criticality safety components
Components specified by the designer that may affect the criticality safety of the vessel.
4 General
4.1 General Requirements
The manufacturing unit shall prepare the manufacturing process documents according to the container design documents and the requirements of the relevant standards before the start of the manufacturing activities, and strictly implement them.
For special processes involved in the manufacturing process (such as lead filling, neutron shielding filling, etc.), process tests or process evaluations shall be carried out. Typical container structure parameters
See Appendix A.
4.2 Change application and material substitution
Changes to the original design documents by the manufacturing unit and material substitution for all parts and components shall be submitted in writing, and the original design unit's written approval shall be obtained.
Permit and record in detail on as-built drawings.
4.3 Quality Assurance
4.3.1 The quality assurance related content of the container shall meet the relevant requirements of GB/T 15219.
4.3.2 The quality assurance program should be formulated and implemented effectively.
4.3.3 Before the container is manufactured, the manufacturer shall prepare a quality plan for the container, which shall include quality control points, quality inspection and control methods
and tests to be completed.
4.3.4 The manufacturing unit shall manage all non-conformities by classification and classification, and handle the non-conformities according to the procedures reviewed and approved by the design unit
to be processed.
4.3.5 The manufacturing unit shall code each container.
5 Material re-inspection, segmentation and marker transplantation
5.1 Material re-inspection
5.1.1 The following materials should be re-tested.
1) Materials for containment boundary components;
2) Structural materials for critical safety-related components;
3) Other materials required for re-inspection in the design documents.
5.1.2 The re-inspection requirements and results of materials shall meet the requirements of the design documents (such as steel, neutron absorption, neutron shielding materials, etc.).
5.2 Material segmentation
The material can be divided by cold cutting or hot cutting method. When thermal cutting is used to divide material, surface dross and effects on manufacturing should be removed
quality surface layer.
5.3 Material logo migration
For the materials used for components that have traceability requirements in the design documents, during the manufacturing process, such as when the original logo is cut off or the material is divided into several pieces,
The manufacturing unit shall specify the expression of the logo and complete the transplantation of the logo before the material is divided.
For stainless steel plates, hard stamping should not be used.
6 Forming and Assembly
6.1 Cold and hot forming
6.1.1 The cold and hot forming processes that have been tested or evaluated shall be used.
6.1.2 The manufacturing unit shall determine the machining allowance according to the manufacturing process, and shall comply with the dimensions and tolerances (including geometric tolerances) specified in the design documents.
Process and manufacture to ensure that the actual thickness of the important parts of the container after forming is not less than the minimum forming thickness marked on the design drawings.
6.1.3 Limit deviation of linear dimensions without tolerances. machined dimensions are performed in accordance with the m-level accuracy of GB/T 1804-2000, non-machined
The size of the work is carried out according to the C-level precision. The tolerance of uninjected shape and position is in accordance with the provisions of GB/T 1184-1996, the machining is in accordance with the K-level precision, and the welding is in accordance with the L-level
precision.
6.1.4 The main body shape, welding groove, welding seam, etc. of main parts such as cylinder body and head (end, bottom) shall be fully formed.
meet the relevant requirements of the design documents.
6.1.5 Take measures to prevent contamination of stainless steel materials during the forming process. Pickling and passivation of the surface of austenitic stainless steel parts
The parts that need to be welded should be pickled and passivated after welding.
6.1.6 The processed parts should be properly protected to avoid surface damage such as scratches and bruises on the machined surface.
6.1.7 The surface roughness of all exposed surfaces of containers for wet loading shall not be greater than Ra3.2.For containers with painted surfaces such as carbon steel and low-alloy steel,
Its surface coating shall meet the relevant requirements for long-term corrosion-resistant coatings in relevant nuclear facilities.
6.2 Component assembly
6.2.1 During the assembly process of the container parts, the centering and leveling shall not be carried out by force.
6.2.2 If any clear markings are likely to be damaged during assembly or machining, they should be repeated after this operation has been carried out.
logo.
6.3 Shield fabrication
The manufacturing unit shall separately prepare the process document of the main shielding layer of the container to specify and control its processing process and method.
The software should consider at least the following.
a) Ensure the density and uniformity of the shielding layer;
b) Process sequence;
c) For the shielding material that needs to be poured, the analog parts of the same size should be poured according to the requirements of the design drawings, and the liquid viscosity should be considered during the pouring process.
The density and density of the material should be controlled, and the density of the material should be checked after pouring to ensure that no defects such as cracks and cavities are formed in the material;
d) If the gamma shielding layer is manufactured by lead filling, the process should at least consider the following.
1) The temperature should be effectively controlled to ensure that the temperature increase of all parts during the whole process of lead filling will not affect the safety of their materials.
Full performance (such as the temperature of austenitic stainless steel should not exceed its sensitization temperature);
2) Measures and operating procedures to prevent uneven deformation of the inner and outer cylinders;
3) Inspection of lead grade and purity;
4) Regulations for heating, pouring and cooling devices, requirements and measurement for temperature control of lead liquid and inner and outer cylinders;
5) Operation sequence;
6) Pre-cleaning process;
7) Pouring method and speed;
8) Preheating and controlled cooling methods;
9) Details of the pouring and ventilation connection system and other relevant information;
10) The pouring process of lead is a continuous operation;
11) When the process of enamelling lead first and then filling lead is adopted, ultrasonic inspection should be carried out on the adhesion area after lead enamelling, and the abutment area should not be less than
80%.
7 Welding
7.1 General provisions
The welding and non-destructive testing requirements of the vessel shall meet the requirements of the drawings and design specifications.
7.2 Welding requirements
It is recommended to use argon arc welding, electrode arc welding and submerged arc welding for welding, and other welding methods should be reported to the design unit in advance.
meaning. Flux-cored arc welding shall not be used.
7.3 Personnel qualifications
7.3.1 Welders and welding operators shall obtain corresponding qualification certificates in accordance with the provisions of HAF603, and carry out inspections in accordance with NNSA-HAJ-0002-2019.
Perform skill assessment.
7.3.2 Non-destructive testing personnel shall obtain corresponding qualification certificates according to the provisions of HAF602.
7.4 Welding consumables
7.4.1 Welding consumables shall be accepted in batches, and the batches shall meet the GB/T 25778-2010 standard.
Should be from the same heat. The light welding wire should meet the S3 level. The submerged arc welding wire should meet the S3 level, and the flux should meet the F2 level.
Batch welding wire combination, which constitutes an inseparable group of welding materials in the manufacturing and acceptance of welding materials.
7.4.2 For the welding of carbon steel, low alloy steel, martensitic stainless steel or other steel grades that are prone to delayed cracking, ultra-low hydrogen welding shall be adopted.
Material.
7.4.3 When the base metal has requirements, the welding material shall be subjected to the corresponding high-temperature tensile test of deposited metal, impact performance test, corrosion test, etc.
The test methods and acceptance criteria shall meet the requirements of the design documents, and the above requirements shall be supplemented in the procurement technical requirements.
7.5 Qualification of welding procedures
7.5.1 The base metal for welding procedure qualification shall be checked and accepted to meet the technical requirements for product base metal procurement.
7.5.2 For the base metal with hardness requirements, the lower limit of the welding heat input coverage for process qualification is the minimum heat input of the test piece. for punch
The upper limit of the heat input coverage of the process evaluation is the maximum heat input of the test piece. Test methods and acceptance criteria shall be satisfied
Design file requirements.
7.5.3 When the base metal has requirements, the test items for welding procedure qualification shall include the corresponding high temperature tensile test, impact performance test, corrosion test, etc.
Tests, etc., test methods and acceptance criteria shall meet the requirements of the design documents.
7.5.4 Tack welds If they form part of the product welds, the welding procedure qualification welds shall include tack welds.
7.5.5 The welding procedure qualification test piece shall pass the non-destructive inspection specified for the product joint and be accepted as qualified.
7.5.6 Welding procedure qualification may refer to NB/T 20450-2017 series standards or other equivalent standards.
7.6 Product welding
7.6.1 The forcible alignment of weldments shall be avoided, and the allowable amount of misalignment shall comply with the requirements for Class A welded joints in NB/T 20450-2017.
7.6.2 The maximum interpass temperature of austenitic stainless steel is 150 ℃.
7.6.3 For austenitic stainless steels, the molten pool and the back of the base metal shall be protected with argon until a metal thickness of at least 5 mm is obtained. according to
Depending on the welding method, this thickness may increase.
7.6.4 All requirements for tack weld welding shall be the same as for formal product welds. Tack welds should be completely removed after completing their function, or
Trim both ends of the tack weld by grinding or other suitable means so that it can be well integrated into the final weld. For melting into the most
Tack welds of final welds shall be visually inspected and defective tack welds shall be removed.
7.6.5 During welding and possible heat treatment, it shall be ensured that the critical temperature of any material used in the manufacture of the vessel is not exceeded.
Temper bead technique is not allowed.
7.6.6 Rework at the same position of the same weld shall not exceed 2 times. For weld repairs exceeding the above specified number of times, the design shall be obtained in advance.
unit of measure approval.
7.6.7 For submerged arc welding, flux recycling is not allowed.
7.7 Appearance, dimensional inspection and non-destructive inspection
7.7.1 Appearance and dimensional inspection shall be carried out for all welds. The surface quality of the weld, the amount of misalignment, the excess height, and the shape of the fillet weld shall conform to the design
According to the requirements of the document, the weld is not allowed to have undercut.
7.7.2 The non-destructive testing items and acceptance requirements shall meet the requirements of design documents and NB/T 20450-2017 or other equivalent standards.
7.7.3 When ultrasonic inspection of austenitic stainless steel welded joints is carried out, a comparative test block shall be made, and the design of the test block and the ultrasonic inspection process shall be
It can be implemented only after the design unit agrees.
7.7.4 The repaired weld shall be accepted according to the corresponding requirements of the original weld.
7.8 Welding witness
7.8.1 Welding witnesses shall be set according to the requirements of the design documents.
7.8.2 The witness piece shall generally be set in the extended section of the longitudinal seam of the product, and it is required to be consistent with the welding seam of the product. Sampling and testing of mechanical properties of witness parts
The inspection items and methods are consistent with the requirements of the product welding procedure evaluation standard. The non-destructive testing requirements and acceptance criteria of the witness parts are consistent with the corresponding product welds
same.
7.8.3 The welding record of the welding witness, the sampling position diagram of the witness sample, the non-destructive inspection report, and the various test reports shall be collected together
Form a "Welding Witness Report" and submit it as the factory data.
8 trials
8.1 General provisions
The function and safety performance of the container shall be verified by relevant tests during the manufacturing process and after assembly and inspection. specific test
The content of the inspection shall be specified by the design unit and the purchaser, and shall be implemented in strict accordance with the procedures approved by the design unit and the purchaser. as test kit
Including the following related content, the manufacturing unit can refer to the implementation.
8.2 Gamma shielding test
Scanning or point-by-point measurement should be used to verify whether the gamma shielding performance of the container meets the design requirements. The performance test procedure shall contain at least the following
The following.
a) Dimensional control of lead filling space (when lead filling process is adopted);
b) measurement techniques (including electronic components);
c) information on the type and intensity of the radioactive source;
d) standards and methods for calibrating sources, sensors and other related equipment;
e) grid type information for screening inspection;
f) Gamma sensor type information;
g) test requirements;
h) test method;
i) Acceptance criteria.
8.3 Static load test of lifting device
Each pair of hoisting devices shall be subjected to a static load test according to the following methods.
a) During the test, the container cover shall be fastened to the container with bolts, and the lifting devices used in pairs shall jointly bear 3 times the maximum lifting load.
The load should be evenly distributed on the contact surface between each lifting device and the test tool;
b) The load should be held for 10 minutes;
c) Visual inspection is not allowed to have deformation. Before and after the test, the lifting device and its joint parts should be checked according to the requirements of Section 7.7.
Surface non-destructive inspection.
8.4 Static load test of turning device
Each pair of turning devices shall be subjected to a static load test according to the following methods.
a) During the test, the container cover shall be fastened to the container with bolts, and the paired overturning devices shall bear 1.5 times the maximum overturning load.
The load should be evenly distributed on the contact surface between the turning device and the test fixture;
b) The load should be held for 10 minutes;
c) Visual inspection is not allowed to have deformation. Before and after the test, the overturning device and its joint parts should be checked according to the requirements of Section 7.7.
Surface non-destructive inspection.
8.5 Pressure test
8.5.1 After the containment boundary of the container and the whole of the container are all manufactured, pressure tests shall be carried out respectively. If the hydraulic test is used, the test pressure
The force should not be less than 1.25 times the design pressure; if the air pressure test is used, the test pressure should not be less than 1.15 times the design pressure. pressure hold
30 minutes.
8.5.2 The range of the pressure gauge for the pressure test should be about 2 times the test pressure, not less than 1.5 times and not higher than 3 times, and the accuracy should not be lower than
Class 1.6, the dial diameter must not be less than 100 mm.
8.5.3 Leakage of container caps and hole caps is not allowed. After the test is completed, the main containment boundary of the container is dried, and a visual inspection is carried out.
Welds related to the inner cavity shall be subjected to surface non-destructive examination in accordance with the requirements of Section 7.7 and shall meet the requirements of the design documents.
8.6 Drainage test
8.6.1 The container for wet loading and unloading shall be subjected to a drainage test.
8.6.2 Place the container vertically and fill it with water (it is recommended to fill the inner cavity with water), cover the container, and tighten the connecting bolts. Use the container that comes with the
The air drainage device performs the drainage operation. The entire drainage process should be smooth and meet the requirements of the design documents.
8.7 Vacuum drying test
After the drainage test is completed as described in Section 8.6, the vacuum drying test shall be carried out as required by the design documents. The tests shall be able to be specified in the design documents
Complete the vacuum drying test within time to reach the specified vacuum degree.
8.8 Sealing performance test
8.8.1 The sealing performance test shall be carried out in accordance with GB/T 17230.
8.8.2 After the welding of the containment boundary is completed, the surface non-destructive inspection shall be carried out for the welding seam of the containment boundary of the vessel according to the requirements of Section 7.7.
A helium leak test is carried out at the volume boundary.
8.8.3 After the overall manufacture of the container is completed, the container shall be fully tested for helium leaks. The test scope shall include at least. vessel containment weldments,
The inner cover of the container and its inner channel sealing ring, air intake and drainage ports and other containment boundary penetration parts sealing cover and its inner channel sealing ring.
8.8.4 The accuracy of the measuring instruments shall match the acceptance criteria.
8.8.5 If there is leakage, the location where the leakage occurs shall be confirmed, and the manufacturer shall prepare a treatment plan and obtain the written consent of the design unit before proceeding.
After treatment, the test needs to be repeated.
8.8.6 The sealing performance test of the non-contained boundary shall be carried out according to the design documents.
8.9 Heat conduction test
In each batch of containers with the same manufacturing process, the first container should be selected for heat conduction test. The test should consider the following.
a) When the actual ambient temperature of the test is lower than the design maximum ambient temperature, the measured value should be corrected to the result of the maximum ambient temperature;
b) The power control of the heating device shall be such that the test can be carried out by simulating the design basis parameters of the container in the normal transport state;
c) the arrangement of temperature measuring devices;
d) The temperature limit setting of each measuring point shall meet the requirements of the design document.
If the container test fails, the batch of containers shall be subjected to a heat conduction test one by one.
8.10 Insertion and insertion test of simulated fuel assembly in storage cavity
The gondola loaded into the container shall be subjected to a plugging test (100% inspection) for all storage cavities using simulated fuel assemblies. The simulated fuel assembly should be able to
Smooth and unimpeded passage through the full length of the reservoir. The section and length of the simulated fuel assembly shall not be less than the size of the fuel assembly to be loaded, and shall be suitable for
When considering swelling deformation of spent fuel assemblies.
8.11 Component functional test
8.11.1 Valves
Action tests should be carried out on the relief valve to ensure that the valve can work normally under the specified pressure.
8.11.2 Removable parts
All removable parts on the container should be tested for loading and unloading to ensure proper function.
8.11.3 Damping parts
The shock absorbing components should be properly sealed under normal conditions to ensure the performance of the shock absorbing material. If it is a welded sealing structure, the welding seam should be designed according to the design.
The document requires a tightness test to verify its weld integrity.
9 Container Factory Requirements
9.1 Factory data
The manufacturing unit shall provide the purchaser with the following ex-factory information.
a) quality assurance program and quality plan;
b) Material quality certificate and relevant documents for incoming re-inspection (including base metal, welding material, neutron absorbing material, neutron shielding material, other
other materials and purchased parts);
c) Welding process related documents.
1) Parent material quality certificate and acceptance report;
2) Welding material quality certificate and acceptance report;
3) Welding data package;
4) Welding procedure qualification report and corresponding welding procedure specification number;
5) Qualification and skill evaluation records of welders or welding operators;
6) Product welding records;
7) Heat treatment report of welded joints (if any);
8) Appearance, size and non-destructive inspection report of welded joints;
9) Product welding witness report (if any);
10) Weld repair record and inspection result report (if any).
d) All process test and acceptance test report of the container;
e) Equipment final dimension inspection report;
f) Change application form and corresponding approval documents;
g) Non-conformity handling report (if any);
h) as-built drawings;
i) Evaluation report of lead filling process (containers using lead filling process);
j) lead filling records (containers using lead filling process);
k) other special process evaluation report (if any);
l) Packing list.
9.2 Product nameplate
The nameplate of the container should be fixed in an obvious position, and the nameplate should include the following.
a) container name and model;
b) the owner;
c) container code;
d) manufacturing unit;
e) date of manufacture;
f) design unit;
g) the quality of the container;
h) Overall dimensions;
i) type of package;
j) content;
k) Maximum radioactivity.
9.3 Cleaning, Packaging and Shipping
The inner and outer surfaces of the equipment are cleaned and packaged in accordance with the A1-level clean surface in NB/T.20001-2010, and according to the requirements of the order contract
to transport.
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