ML23293A302
| ML23293A302 | |
| Person / Time | |
|---|---|
| Site: | 07201004 |
| Issue date: | 11/08/2023 |
| From: | Storage and Transportation Licensing Branch |
| To: | TN Americas LLC |
| Shared Package | |
| ML23293A298 | List: |
| References | |
| EPID L-2022-LLA-0079, CAC 001028 | |
| Download: ML23293A302 (1) | |
Text
RENEWED AMENDMENT NUMBER 18 TO COC 1004 APPENDIX C ASME CODE ALTERNATIVES FOR THE STANDARDIZED NUHOMS HORIZONTAL MODULAR STORAGE SYSTEM DOCKET 72-1004
LIST OF TABLES Page Table C-1 ASME Code Alternatives for NUHOMS-24P, 24PHB and 52B DSC Pressure Boundary Components ...................................................................... C-2 Table C-2 ASME Code Alternatives for NUHOMS-24P, 24PHB, and 52B DSC Basket Assembly ............................................................................................... C-5 Table C-3 ASME Code Alternatives for the NUHOMS-61BT DSC Confinement Boundary ........................................................................................................... C-6 Table C-4 ASME Code Alternatives for the NUHOMS-61BT DSC Basket ....................... C-8 Table C-5 Alternatives to the ASME Code for the NUHOMS-32PT DSC Confinement Boundary ...................................................................................... C-9 Table C-6 Alternatives to the ASME Code for the NUHOMS-32PT DSC Basket Assembly ......................................................................................................... C-11 Table C-7 Alternatives to the ASME Code for the NUHOMS-24PTH DSC Confinement Boundary .................................................................................... C-12 Table C-8 Alternatives to the ASME Code for the NUHOMS-24PTH DSC Basket Assembly ......................................................................................................... C-14 Table C-9 Alternatives to the ASME Code for the NUHOMS 32PTH1 DSC Confinement Boundary .................................................................................... C-16 Table C-10 Alternatives to the ASME Code for the NUHOMS 32PTH1 DSC Basket Assembly ......................................................................................................... C-18 Table C-11 ASME Code Alternatives for the NUHOMS-61BTH DSC Confinement Boundary ......................................................................................................... C-20 Table C-12 ASME Code Alternatives for the NUHOMS-61BTH DSC Basket .................. C-22 Table C-13 Alternatives to the ASME Code for the NUHOMS 37PTH DSC Confinement Boundary .................................................................................... C-24 Table C-14 Alternatives to the ASME Code for the NUHOMS 37PTH DSC Basket Assembly ......................................................................................................... C-26 Table C-15 ASME Code Alternatives for the NUHOMS-69BTH DSC Confinement Boundary ......................................................................................................... C-27 Table C-16 ASME Code Alternatives for the NUHOMS-69BTH DSC Basket .................. C-29 Table C-17 ASME Code Alternatives for the Standardized NUHOMS System TCs Except for the OS200 and OS200FC TCs....................................................... C-31 Table C-18 ASME Code Alternatives for the Standardized NUHOMS System OS200 and OS200FC TCs .......................................................................................... C-33 Standardized NUHOMS System ASME Code Alternatives Renewed C-i Amendment 18
C. ASME Code Alternatives Approved ASME Code Alternatives can be found in the following tables.
DSC or TC Model(s) ASME Code Alternative Topic Reference Table 24P, 24PHB Pressure Boundary Components Table C-1 and 52B DSC 24P, 24PHB Basket Assembly Table C-2 and 52B DSC 61BT DSC Confinement Boundary Table C-3 61BT DSC Basket Table C-4 32PT DSC Confinement Boundary Table C-5 32PT DSC Basket Assembly Table C-6 24PTH DSC Confinement Boundary Table C-7 24PTH DSC(2) Type 1 and 2 Basket Assembly Table C-8 32PTH1 DSC Confinement Boundary Table C-9 32PTH1 DSC Basket Assembly Table C-10 61BTH DSC Confinement Boundary Table C-11 61BTH DSC Basket Table C-12 37PTH DSC Confinement Boundary Table C-13 37PTH DSC Basket Assembly Table C-14 69BTH DSC Confinement Boundary Table C-15 69BTH DSC Basket Table C-16 All CoC 1004 TCs Except for the OS200 and TC structural components Table C-17 OS200FC TCs OS200 and OS200FC TCs TC structural components Table C-18 NOTE:
(1) See the CoC Section II.1 Design Features for the applicable ASME code edition and years for each of these tables.
(2) ASME Code is not applicable for the Type 3 basket assembly in 24PTH-S, 24PTH-L or the 24PTH-S-LC DSCs.
Standardized NUHOMS System ASME Code Alternatives Renewed C-1 Amendment 18
Table C-1 ASME Code Alternatives for NUHOMS-24P, 24PHB and 52B DSC Pressure Boundary Components Reference ASME Code Code Requirement Alternatives, Justification and Compensatory Measures Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping is not required. As Code Stamping is not required, Code Stamping of the fabricator is not required to hold an ASME N or NPT stamp, or NB-1100 Components, Code to be ASME Certified.
reports and certificates, etc.
Attachments with a Bottom shield plug and outer bottom cover plate are outside code pressure retaining jurisdiction; these components together are much larger than function, including required to provide stiffening for the inner bottom cover plate; the NB-1132 stiffeners, shall be weld that retains the outer bottom cover plate and with it the bottom considered part of shield plug is subject to root and final PT examination.
the component.
Material must be Material is certified to meet all ASME Code criteria but is not eligible supplied by ASME for certification or Code Stamping if a non-ASME fabricator is used.
NB-2130 approved material As the fabricator is not required to be ASME certified, material suppliers. certification to NB-2130 is not possible. Material traceability and Material Certification certification are maintained in accordance with TNs NRC approved NB-4121 QA program.
by Certificate Holder NB-4240 Full penetration DSC Pressure Boundary Welds:
welds are required The joint details at the top and bottom end of the DSCs are not full for pressure penetration welds and thus do not comply with the requirements of boundary closure figure NB-4243-1 for Category C flat head closure pressure and joints. containment boundary welds. Volumetric weld inspection (RT or UT)
NB-5230 Weld examination is not practical due to the DSC geometry at the top and bottom shall be UT or RT closures and due to high radiation at the top closure after fuel loading with surface PT. (ALARA consideration).
The inner and outer cover plate closure welds provide redundant closure welds, which are required by the 10 CFR Part 72 license.
These welds are partial penetration welds that have been designed using a conservative weld efficiency factor of 0.6.
Breach of the DSC confinement barriers due to an undetected flaw in any single weld layer is implausible due to the requirement for multi-layer welds. The top and bottom outer cover plate to shell welds and the inner bottom cover plate to shell weld receive a root and final PT.
The top inner cover plate to shell weld, which is leak tested, has a final PT only.
Standardized NUHOMS System ASME Code Alternatives Renewed C-2 Amendment 18
Table C-1 ASME Code Alternatives for NUHOMS-24P, 24PHB and 52B DSC Pressure Boundary Components Reference ASME Code Code Requirement Alternatives, Justification and Compensatory Measures Section/Article NB-6111 All completed The pressure retaining system of the DSC consists of the following pressure retaining components: shell, bottom inner cover plate, siphon and vent block systems shall be siphon and vent port covers, and top inner cover plates. The bottom pressure tested. cover plates are welded to the shell at the fabricator shop, whereas the top cover plates are field-welded to the shell at the nuclear power plant, following the loading of irradiated nuclear fuel. All other welds made to the pressure boundary, such as the support ring to shell weld, are not part of the pressure boundary and, thus, are not pressure tested.
DSC Shell and Bottom Cover Plate Welds:
The DSC Shell and inner bottom cover plate are pressure tested during fabrication to the requirements of NB-6000. A helium leak test is performed to demonstrate leakage integrity of this boundary. Since the outer bottom cover plate is installed after the inner bottom cover plate is installed, it cannot be pressure tested.
DSC Top Cover Plates Closure Welds:
The top closure welds are not completed until the DSC is loaded with irradiated nuclear fuel; therefore, a pressure test is not performed.
Multi-layer welds are used for these joints to eliminate potential leakage paths. The inner and outer top closure welds are tested as follows:
Inner Top Confinement Boundary Welds:
The inner top confinement boundary welds include the following: (1) field weld of inner cover plate to shell weld (including inner top cover plate to vent and siphon block), (2) top of siphon and vent block to shell weld, and (3) field weld of siphon and vent port cover plates to vent and siphon block ports. Weld (1) is helium leak tested in the field. Weld (2) is made in the fabricator shop under controlled conditions and receives a final PT. A pressure test and helium leak test are not practical because of its location. A field leak test of weld (2) is not performed because the current 10 CFR Part 72 license does not require it. Weld (3) is performed in the field with a final PT and without a leak test. A helium leak test cannot be performed on these welds because the vent and siphon ports are covered by the plates. Pressurization would require cutting a hole in the DSC creating a potential leakage point for the long-term storage canister.
Outer Top Cover Plate Weld:
The outer top cover plate to shell weld receives a root and final PT. It is not leak tested because it is installed following the inner top cover plate.
No overpressure protection is provided for the NUHOMS DSCs.
The function of the DSC is to contain radioactive materials under Overpressure normal, off-normal and hypothetical accident conditions postulated to NB-7000 Protection occur during transportation and storage. The DSC is designed to withstand the maximum possible internal pressure considering 100%
fuel rod failure at maximum accident temperature.
The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NB-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
Standardized NUHOMS System ASME Code Alternatives Renewed C-3 Amendment 18
Table C-1 ASME Code Alternatives for NUHOMS-24P, 24PHB and 52B DSC Pressure Boundary Components Reference ASME Code Code Requirement Alternatives, Justification and Compensatory Measures Section/Article NDE personnel must be qualified to Permit use of the Recommended Practice SNT-TC-1A to include up NB-5520 a specific edition of to the most recent 2011 edition.
SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-4 Amendment 18
Table C-2 ASME Code Alternatives for NUHOMS-24P, 24PHB, and 52B DSC Basket Assembly Reference Code ASME Code Alternatives, Justification and Compensatory Measures Requirement Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
NF-2130 Material must be All DSC Basket Assembly sub-components designated as ASME on supplied by ASME the DSC drawings are obtained from TN approved suppliers with approved material Certified Material Test Reports (CMTRs). The DSC basket suppliers. subcomponents listed below have been designated as non-Code.
Guide Sleeves, Over Sleeves, and extraction stops (PWR only)
Neutron Absorber Plates and misc. hardware, such as anti-rotation pin, screws and locknuts, (BWR Only)
Coating for Spacer Discs NF-4121 Material Material traceability and certification are maintained in accordance Certification by with TNs NRC approved QA program.
Certificate Holder The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NF-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
NDE Personnel must be qualified Permit use of the Recommended Practice SNT-TC-1A to include up NF-5520 to a specific to the most recent 2011 edition.
edition of SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-5 Amendment 18
Table C-3 ASME Code Alternatives for the NUHOMS-61BT DSC Confinement Boundary Reference Code ASME Code Alternatives, Justification & Compensatory Measures Requirement Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NB-1100 Components, the fabricator is not required to hold an ASME N or NPT stamp, or Code reports and to be ASME Certified.
certificates, etc.
Attachments with a pressure Bottom shield plug and outer bottom cover plate are outside code retaining function, jurisdiction; these components together are much larger than NB-1132 including required to provide stiffening for the inner bottom cover plate; the stiffeners, shall be weld that retains the outer bottom cover plate and with it the bottom considered part of shield plug is subject to root and final PT examination.
the component.
Material must be supplied by ASME Material is certified to meet all ASME Code criteria but is not eligible NB-2130 for certification or Code Stamping if a non-ASME fabricator is used.
approved material suppliers. As the fabricator is not required to be ASME certified, material certification to NB-2130 is not possible. Material traceability and Material certification are maintained in accordance with TNs NRC approved NB-4121 Certification by QA program.
Certificate Holder Category C weld joints in vessels and similar weld The joints between the top outer and inner cover plates and joints in other containment shell are designed and fabricated per ASME Code Case components shall N-595-1. This includes the inner top cover plate weld around the NB-4243 and be full penetration vent and siphon block. The welds are partial penetration welds and NB-5230 joints. These the root and final layer are PT examined. The weld between the vent welds shall be and siphon block and the shell is made at the fabricators shop and examined by UT receives a final PT examination.
All completed The vent and siphon block is not pressure tested due to the NB-6100 and pressure retaining manufacturing sequence. The siphon block weld is helium leak 6200 systems shall be tested when fuel is loaded and then covered with the outer top pressure tested. closure plate.
No overpressure protection is provided for the NUHOMS DSCs.
The function of the DSC is to contain radioactive materials under Overpressure normal, off-normal and hypothetical accident conditions postulated to NB-7000 Protection occur during transportation and storage. The DSC is designed to withstand the maximum possible internal pressure considering 100%
fuel rod failure at maximum accident temperature.
Standardized NUHOMS System ASME Code Alternatives Renewed C-6 Amendment 18
Table C-3 ASME Code Alternatives for the NUHOMS-61BT DSC Confinement Boundary Reference Code ASME Code Alternatives, Justification & Compensatory Measures Requirement Section/Article The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NB-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
NDE Personnel must be qualified Permit use of the Recommended Practice SNT-TC-1A to include up NB-5520 to a specific to the most recent 2011 edition.
edition of SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-7 Amendment 18
Table C-4 ASME Code Alternatives for the NUHOMS-61BT DSC Basket Reference Code ASME Code Alternatives, Justification & Compensatory Measures Requirement Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NG/NF-1100 Components, the fabricator is not required to hold an ASME N or NPT stamp, or Code reports and to be ASME Certified.
certificates, etc.
Some baskets include neutron absorber and aluminum plates that are not ASME Code Class 1 material. They are used for criticality Use of ASME NG/NF-2000 safety and heat transfer, and are only credited in the structural Code Material analysis with supporting their own weight and transmitting bearing loads through their thickness.
NDE Personnel must be qualified Permit use of the Recommended Practice SNT-TC-1A to include up NG/NF-5520 to a specific to the most recent 2011 edition.
edition of SNT-TC-1A.
Material must be supplied by ASME Material is certified to meet all ASME Code criteria but is not eligible NG/NF-2130 for certification or Code Stamping if a non-ASME fabricator is used.
approved material suppliers. As the fabricator is not required to be ASME certified, material certification to NG/NF-2130 is not possible. Material traceability and Material certification are maintained in accordance with TNs NRC approved NG/NF-4121 Certification by QA program.
Certificate Holder Requirements for The NUHOMS DSC nameplate provides the information required by nameplates, 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as NG/NF-8000 stamping & appropriate. Code stamping is not required for the DSC. QA data reports per NCA- packages are prepared in accordance with the requirements of TNs 8000. approved QA program.
Standardized NUHOMS System ASME Code Alternatives Renewed C-8 Amendment 18
Table C-5 Alternatives to the ASME Code for the NUHOMS-32PT DSC Confinement Boundary Reference Code ASME Code Alternatives, Justification & Compensatory Measures Requirement Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NB-1100 Components, the fabricator is not required to hold an ASME N or NPT stamp, or Code reports and to be ASME Certified.
certificates, etc.
Attachments with a pressure Bottom shield plug and outer bottom cover plate are outside code retaining function, jurisdiction; these components together are much larger than NB-1132 including required to provide stiffening for the inner bottom cover plate; the stiffeners, shall be weld that retains the outer bottom cover plate and with it the bottom considered part of shield plug is subject to root and final PT examination.
the component.
Material must be supplied by ASME Material is certified to meet all ASME Code criteria but is not eligible NB-2130 for certification or Code Stamping if a non-ASME fabricator is used.
approved material suppliers. As the fabricator is not required to be ASME certified, material certification to NB-2130 is not possible. Material traceability and Material certification are maintained in accordance with TNs NRC approved NB-4121 Certification by QA program.
Certificate Holder The joints between the top outer and inner cover plates and containment shell are designed and fabricated per ASME Code Case N-595-2, which provides alternative requirements for the design and examination of spent fuel canister closures. This includes the inner top cover plate weld around the vent & siphon block and the vent and Category C weld siphon block welds to the shell. The closure welds are partial joints in vessels penetration welds and the root and final layer are subject to PT and similar weld examination (in lieu of volumetric examination) in accordance with joints in other the provisions of ASME Code Case N-595-2.
components shall The 32PT closure system employs austenitic stainless steel shell, lid NB-4243 and be full penetration materials, and welds. Because austenitic stainless steels are not NB-5230 joints. These subject to brittle failure at the operating temperatures of the DSC, welds shall be crack propagation is not a concern. Thus, multi-level PT examination examined by UT provides reasonable assurance that flaws of interest will be identified.
or RT and either The PT examination is done by qualified personnel, in accordance PT or MT. with Section V and the acceptance standards of Section III, Subsection NB-5000.
This alternative does not apply to other shell confinement welds, i.e.,
the longitudinal and circumferential welds applied to the DSC shell, and the inner bottom cover plate-to-shell weld which comply with NB-4243 and NB-5230.
Standardized NUHOMS System ASME Code Alternatives Renewed C-9 Amendment 18
Table C-5 Alternatives to the ASME Code for the NUHOMS-32PT DSC Confinement Boundary Reference Code ASME Code Alternatives, Justification & Compensatory Measures Requirement Section/Article All pressure retaining The NUHOMS-32PT DSC is pressure tested in accordance with components and ASME Code Case N-595-2. The shield plug support ring and the completed vent and siphon block are not pressure tested due to the NB-6100 and systems shall be manufacturing sequence. The support ring is not a pressure-6200 pressure tested. retaining item and the vent and siphon block weld is helium leak The preferred tested after fuel is loaded to the same criteria as the inner top closure method shall be plate-to-shell weld (ANSI N14.5-1997 leaktight criteria).
hydrostatic test.
No overpressure protection is provided for the NUHOMS DSCs.
The function of the DSC is to contain radioactive materials under Overpressure normal, off-normal and hypothetical accident conditions postulated to NB-7000 Protection occur during transportation and storage. The DSC is designed to withstand the maximum possible internal pressure considering 100%
fuel rod failure at maximum accident temperature.
Requirements for The NUHOMS DSC nameplate provides the information required by nameplates, 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as NB-8000 stamping & appropriate. Code stamping is not required for the DSC. QA data reports per NCA- packages are prepared in accordance with the requirements of TNs 8000. approved QA program.
NDE Personnel must be qualified Permit use of the Recommended Practice SNT-TC-1A to include up NB-5520 to a specific to the most recent 2011 edition.
edition of SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-10 Amendment 18
Table C-6 Alternatives to the ASME Code for the NUHOMS-32PT DSC Basket Assembly Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NG-1100 Components, Code the fabricator is not required to hold an ASME N or NPT stamp, or reports and to be ASME Certified.
certificates, etc.
Some baskets include neutron absorber and aluminum plates that are not ASME Code Class 1 material. They are used for criticality safety and heat transfer, and are only credited in the structural analysis with supporting their own weight and transmitting bearing Use of ASME loads through their thickness. Material properties in the ASME Code NG-2000 Material for Type 6061 aluminum are limited to 400 °F to preclude the potential for annealing out the hardening properties. Annealed properties (as published by the Aluminum Association and the American Society of Metals) are conservatively assumed for the solid aluminum rails for use above the Code temperature limits.
Material must be supplied by ASME Material is certified to meet all ASME Code criteria but is not eligible NG-2130 for certification or Code Stamping if a non-ASME fabricator is used.
approved material suppliers. As the fabricator is not required to be ASME certified, material certification to NG-2130 is not possible. Material traceability and Material Certification certification are maintained in accordance with TNs NRC approved NG-4121 QA program.
by Certificate Holder The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NG-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
Not compliant with ASME Section II Part D Table 2A material temperature limit for XM-19 steel for the postulated transfer accident case (117 °F, loss of sunshade, loss of neutron shield). This is a Maximum NG-3000/ post-drop accident scenario, where the calculated maximum steady temperature limit for Section II, Part state temperature is 852 °F, the expected reduction in material XM-19 plate D, Table 2A strength is small (less than 1 ksi by extrapolation), and the only material is 800 °F.
primary stresses in the basket grid are deadweight stresses. The recovery actions following the postulated drop accident are as described in Section 8.2.5 of the UFSAR.
NDE personnel Permit use of the Recommended Practice SNT-TC-1A to include up must be qualified to to the most recent 2011 edition.
NG-5520 a specific edition of SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-11 Amendment 18
Table C-7 Alternatives to the ASME Code for the NUHOMS-24PTH DSC Confinement Boundary Reference Code ASME Code Alternatives, Justification & Compensatory Measures Requirement Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NB-1100 Components, Code the fabricator is not required to hold an ASME N or NPT stamp, or reports and to be ASME Certified.
certificates, etc.
Attachments with a Bottom shield plug assembly, outer bottom cover plate, lifting posts, pressure retaining grapple ring, grapple ring support are outside code jurisdiction; these function, including components together are much larger than required to provide NB-1132 stiffeners, shall be stiffening for the inner bottom cover plate; the weld that retains the considered part of outer bottom cover plate and with it the bottom shield plug is subject the component. to root and final PT examination.
Material must be Material is certified to meet all ASME Code criteria but is not eligible supplied by ASME for certification or Code Stamping if a non-ASME fabricator is used.
NB-2130 approved material As the fabricator is not required to be ASME certified, material suppliers. certification to NB-2130 is not possible. Material traceability and Material Certification certification are maintained in accordance with TNs NRC approved NB-4121 QA program.
by Certificate Holder The joints between the top outer and inner cover plates (or top forging assembly for the 24PTH-S-LC) and containment shell are designed and fabricated per ASME Code Case N-595-2, which provides alternative requirements for the design and examination of spent fuel canister closures. This includes the inner top cover plate weld around the vent & siphon block and the vent and siphon block Category C weld welds to the shell. The closure welds are partial penetration welds joints in vessels and and the root and final layer are subject to PT examination (in lieu of similar weld joints in volumetric examination) in accordance with the provisions of ASME other components Code Case N-595-2.
NB-4243 and shall be full The 24PTH closure system employs austenitic stainless steel shell, NB-5230 penetration joints. lid materials, and welds. Because austenitic stainless steels are not These welds shall subject to brittle failure at the operating temperatures of the DSC, be examined by UT crack propagation is not a concern. Thus, multi-level PT examination or RT and either PT provides reasonable assurance that flaws of interest will be identified.
or MT. The PT examination is done by qualified personnel, in accordance with Section V and the acceptance standards of Section III, Subsection NB-5000.
This alternative does not apply to other shell confinement welds, i.e.,
the longitudinal and circumferential welds of the DSC shell, and the inner bottom cover plate-to-shell weld (or bottom forging to shell weld, as applicable) which comply with NB-4243 and NB-5230.
Standardized NUHOMS System ASME Code Alternatives Renewed C-12 Amendment 18
Table C-7 Alternatives to the ASME Code for the NUHOMS-24PTH DSC Confinement Boundary Reference Code ASME Code Alternatives, Justification & Compensatory Measures Requirement Section/Article All pressure retaining The NUHOMS-24PTH DSC is pressure tested in accordance with components and ASME Code Case N-595-2. The shield plug support ring and the completed systems vent and siphon block are not pressure tested due to the NB-6100 and shall be pressure manufacturing sequence. The support ring is not a pressure-6200 tested. The retaining item and the vent and siphon block weld is helium leak preferred method tested after fuel is loaded to the same criteria as the inner top closure shall be hydrostatic plate-to-shell weld (ANSI N14.5-1997 leaktight criteria).
test.
No overpressure protection is provided for the NUHOMS DSCs.
The function of the DSC is to contain radioactive materials under Overpressure normal, off-normal and hypothetical accident conditions postulated to NB-7000 Protection occur during transportation and storage. The DSC is designed to withstand the maximum possible internal pressure considering 100%
fuel rod failure at maximum accident temperature.
The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NB-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
NDE Personnel must be qualified to Permit use of the Recommended Practice SNT-TC-1A to include up NB-5520 a specific edition of to the most recent 2011 edition.
SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-13 Amendment 18
Table C-8 Alternatives to the ASME Code for the NUHOMS-24PTH DSC Type 1 and 2 Basket Assembly Reference Code ASME Code Alternatives, Justification & Compensatory Measures Requirement Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NG-1100 Components, Code the fabricator is not required to hold an ASME N or NPT stamp, or reports and to be ASME Certified.
certificates, etc.
Some baskets include neutron absorber and aluminum plates that are not ASME Code Class 1 material. They are used for criticality safety and heat transfer, and are only credited in the structural analysis with supporting their own weight and transmitting bearing Use of ASME loads through their thickness. Material properties in the ASME Code NG-2000 Material for Type 6061 aluminum are limited to 400 °F to preclude the potential for annealing out the hardening properties. Annealed properties (as published by the Aluminum Association and the American Society of Metals) are conservatively assumed for the aluminum transition rails for use above the Code temperature limits.
Material must be Material is certified to meet all ASME Code criteria but is not eligible supplied by ASME for certification or Code Stamping if a non-ASME fabricator is used.
NG-2130 approved material As the fabricator is not required to be ASME certified, material suppliers. certification to NG-2130 is not possible. Material traceability and Material Certification certification are maintained in accordance with TNs NRC approved NG-4121 QA program.
by Certificate Holder The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NG-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
Not compliant with ASME Section II Part D Table 2A material temperature limit for Type 304 steel for the postulated transfer accident case (117 °F, loss of sunshade, loss of neutron shield).
Maximum NG-3000/ This is a post-drop accident scenario, where the calculated maximum temperature limit for Section II, Part steady state temperature is 862 °F, the expected reduction in Type 304 plate D, Table 2A material strength is small (less than 1 ksi by extrapolation), and the material is 800 °F.
only primary stresses in the basket grid are deadweight stresses.
The recovery actions following the postulated drop accident are as described in Section 8.2.5 of the UFSAR.
Standardized NUHOMS System ASME Code Alternatives Renewed C-14 Amendment 18
Table C-8 Alternatives to the ASME Code for the NUHOMS-24PTH DSC Type 1 and 2 Basket Assembly Reference Code ASME Code Alternatives, Justification & Compensatory Measures Requirement Section/Article The fusion (spot) type welds between the stainless steel insert plates (straps) and the stainless steel fuel compartment tube are not permissible welds per Table NG-3352-1. These welds are qualified by testing. The required minimum tested capacity of the welded connection (at each side of the tube) shall be 36 Kips (at room temperature). This value is based on a margin of safety (test-to-design) of 1.6, which is larger than the Code-implied margin of safety for Level D loads. The minimum capacity shall be determined by shear tests of individual specimens made from production material.
The tests shall be corrected for temperature differences (test-to-design) and for material properties (actual-to-ASME Code minimum values) to demonstrate that the capacity of the welded connection with ASME minimum properties, tested at design temperatures, will Table NG-3352-1 meet the 36 Kips test requirement. The capacity of the welded NG-3352 lists the permissible connection is determined from the test of the weld pattern of a typical welded joints. insert plate to the tube connection. The welds will be visually inspected to confirm that they are located over the insert plates, in lieu of the visual acceptance criteria of NG-5260 which are not appropriate for this type of weld. A joint efficiency (quality) factor of 1.0 is utilized for the fuel compartment longitudinal seam welds.
Table NG-3352-1 permits a joint efficiency (quality) factor of 0.5 to be used for full penetration weld examined by ASME Section V visual examination (VT). For the 24PTH DSC, the compartment seam weld is thin, and the weld will be made in one pass. Both surfaces of weld (inside and outside) will be fully examined by VT and therefore a factor of 2 x 0.5=1.0, will be used in the analysis. This is justified as both surfaces of the single weld pass/layer will be fully examined, and the stainless steel material that comprises the fuel compartment tubes is very ductile.
NDE personnel must be qualified to Permit use of the Recommended Practice SNT-TC-1A to include up NG-5520 a specific edition of to the most recent 2011 edition.
SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-15 Amendment 18
Table C-9 Alternatives to the ASME Code for the NUHOMS 32PTH1 DSC Confinement Boundary Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NB-1100 Components, Code the fabricator is not required to hold an ASME N or NPT stamp, or reports and to be ASME Certified.
certificates, etc.
Material must be Material is certified to meet all ASME Code criteria but is not eligible supplied by ASME for certification or Code Stamping if a non-ASME fabricator is used.
NB-2130 approved material As the fabricator is not required to be ASME certified, material suppliers. certification to NB-2130 is not possible. Material traceability and Material Certification certification are maintained in accordance with TNs NRC approved NB-4121 QA program.
by Certificate Holder The shell to the outer top cover weld, the shell to the inner top cover/shield plug weld (including optional design configurations for the inner top cover as described in the 32PTH1 DSC drawings), the Category C weld siphon/vent cover welds, and the vent and siphon block welds to the joints in vessels and shell are all partial penetration welds. As an alternative to the NDE similar weld joints in requirements of NB-5230, for Category C welds, all of these closure other components welds are multi-layer welds and receive a root and final PT NB-4243 and shall be full examination, except for the shell to the outer top cover weld. The NB-5230 penetration joints. shell to the outer top cover weld will be a multi-layer weld and receive These welds shall multi-level PT examination in accordance with the guidance provided be examined by UT in ISG-15 for NDE. The multi-level PT examination provides or RT and either PT reasonable assurance that flaws of interest will be identified. The PT or MT. examination is done by qualified personnel, in accordance with Section V and the acceptance standards of Section III, Subsection NB-5000. All of these welds are designed to meet the guidance provided in ISG-15 for stress reduction factor.
Attachments with a Bottom shield plug and outer bottom cover plate are outside code pressure retaining jurisdiction; these components together are much larger than function, including NB-1132 required to provide stiffening for the inner bottom cover plate; the stiffeners, shall be weld that retains the outer bottom cover plate and with it the bottom considered part of shield plug is subject to root and final PT examination.
the component.
Standardized NUHOMS System ASME Code Alternatives Renewed C-16 Amendment 18
Table C-9 Alternatives to the ASME Code for the NUHOMS 32PTH1 DSC Confinement Boundary Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article The NUHOMS 32PTH1 DSC is not a complete vessel until the top closure is welded following placement of fuel assemblies within the DSC. Due to the inaccessibility of the shell and lower end closure welds following fuel loading and top closure welding, as an alternative, the pressure testing of the DSC is performed in two parts.
The DSC shell and inner bottom plate/forging (including all longitudinal and circumferential welds) are pressure tested and examined at the fabrication facility.
pressure All The shell to the inner top cover/shield plug closure weld (including retaining optional design configurations for the inner top cover as described in components and the 32PTH1 DSC drawings) is pressure tested and examined for completed systems leakage in accordance with NB-6300 in the field.
NB-6100 shall be pressure and 6200 The siphon/vent cover welds are not pressure tested; these welds tested. The and the shell to the inner top cover/shield plug closure weld preferred method (including Optional design configurations for the inner top cover as shall be hydrostatic described in the 32PTH1 DSC drawings) are helium leak tested after test.
the pressure test.
Per NB-6324 the examination for leakage shall be done at a pressure equal to the greater of the design pressure or three-fourths of the test pressure. As an alternative, if the examination for leakage of these field welds, following the pressure test, is performed using helium leak detection techniques, the examination pressure may be reduced to 1.5 psig. This is acceptable given the significantly greater sensitivity of the helium leak detection method.
No overpressure protection is provided for the NUHOMS DSCs.
The function of the DSC is to contain radioactive materials under Overpressure normal, off-normal and hypothetical accident conditions postulated to NB-7000 Protection occur during transportation and storage. The DSC is designed to withstand the maximum possible internal pressure considering 100%
fuel rod failure at maximum accident temperature.
The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NB-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
NDE Personnel must be qualified to Permit use of the Recommended Practice SNT-TC-1A to include up NB-5520 a specific edition of to the most recent 2011 edition.
SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-17 Amendment 18
Table C-10 Alternatives to the ASME Code for the NUHOMS 32PTH1 DSC Basket Assembly Reference Code ASME Code Alternatives, Justification & Compensatory Measures Requirement Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NG-1100 Components, the fabricator is not required to hold an ASME N or NPT stamp, or Code reports and to be ASME Certified.
certificates, etc.
Some baskets include neutron absorber and aluminum plates that are not ASME Code Class 1 material. They are used for criticality safety and heat transfer, and are only credited in the structural analysis with supporting their own weight and transmitting bearing Use of ASME loads through their thickness. Material properties in the ASME Code NG-2000 Material for Type 6061 aluminum are limited to 400 °F to preclude the potential for annealing out the hardening properties. Annealed properties (as published by the Aluminum Association and the American Society of Metals) are conservatively assumed for the aluminum transition rails for use above the Code temperature limits.
Material must be supplied by ASME Material is certified to meet all ASME Code criteria but is not eligible NG-2130 for certification or Code Stamping if a non-ASME fabricator is used.
approved material suppliers. As the fabricator is not required to be ASME certified, material certification to NG-2130 is not possible. Material traceability and Material certification are maintained in accordance with TNs NRC approved NG-4121 Certification by QA program.
Certificate Holder Requirements for The NUHOMS DSC nameplate provides the information required by nameplates, 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as NG-8000 stamping & appropriate. Code stamping is not required for the DSC. QA data reports per NCA- packages are prepared in accordance with the requirements of TNs 8000. approved QA program.
Not compliant with ASME Section II Part D Table 2A material temperature limit for Type 304 steel for the postulated transfer accident case (117 °F, loss of sunshade, loss of neutron shield) and blocked vent accident (117 °F, 40 hr.). The calculated maximum steady state temperatures for transfer accident case and blocked Maximum vent accident case are less than 1000 °F. The only primary stresses NG-3000/
temperature limit in the basket grid are deadweight stresses. The ASME Code allowsSection II, Part for Type 304 plate use of SA240 Type 304 stainless steel to temperatures up to 1000 D, Table 2A material is 800 °F. °F, as shown in ASME Code,Section II, Part D, Table 1A. In the temperature range of interest (near 800 °F), the Sm values for SA240 Type 304 shown in ASME Code,Section II Part D, Table 2A are identical to the allowable S values for the same material shown in Section B, Part D, Table 1A. The recovery actions following these accident scenarios are as described in the UFSAR.
Standardized NUHOMS System ASME Code Alternatives Renewed C-18 Amendment 18
Table C-10 Alternatives to the ASME Code for the NUHOMS 32PTH1 DSC Basket Assembly Reference Code ASME Code Alternatives, Justification & Compensatory Measures Requirement Section/Article The fusion welds between the stainless steel insert plates and the stainless fuel compartment tube are not included in Table NG-3352-
- 1. These welds are qualified by testing. The required minimum tested capacity of the welded connection (at each side of the tube) shall be 45 kips (at room temperature). The capacity shall be demonstrated by qualification and production testing. Testing shall be performed using, or corrected to, the lowest tensile strength of material used in the basket assembly or to minimum specified tensile strength. Testing may be performed on individual welds, or on weld patterns representative of one wall of the tube.
ASME Code Section IX does not provide tests for qualification of these type of welds. Therefore, these welds are qualified using Table NG-3352-1 Section IX to the degree applicable together with the testing lists the described here.
NG-3352 permissible The welds will be visually inspected to confirm that they are located welded joints.
over the insert plates, in lieu of the visual acceptance criteria of NG-5260 which are not appropriate for this type of weld.
A joint efficiency (quality) factor of 1.0 is utilized for the fuel compartment longitudinal seam welds. Table NG-3352-1 permits a joint efficiency (quality) factor of 0.5 to be used for full penetration weld examined by ASME Section V visual examination (VT). For the 32PTH1 DSC, the compartment seam weld is thin and the weld will be made in one pass. Both surfaces of weld (inside and outside) will be fully examined by VT and therefore a factor of 2 x 0.5=1.0, will be used in the analysis. This is justified as both surfaces of the single weld pass/layer will be fully examined, and the stainless steel material that comprises the fuel compartment tubes is very ductile.
NDE personnel must be qualified Permit use of the Recommended Practice SNT-TC-1A to include up NG-5520 to a specific to the most recent 2011 edition.
edition of SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-19 Amendment 18
Table C-11 ASME Code Alternatives for the NUHOMS-61BTH DSC Confinement Boundary Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NB-1100 Components, Code the fabricator is not required to hold an ASME N or NPT stamp, or reports and to be ASME Certified.
certificates, etc.
Attachments with a Bottom shield plug and outer bottom cover plate are outside code pressure retaining jurisdiction; these components together are much larger than function, including NB-1132 required to provide stiffening for the inner bottom cover plate; the stiffeners, shall be weld that retains the outer bottom cover plate and with it the bottom considered part of shield plug is subject to root and final PT examination.
the component.
Material must be Material is certified to meet all ASME Code criteria but is not eligible supplied by ASME for certification or Code Stamping if a non-ASME fabricator is used.
NB-2130 approved material As the fabricator is not required to be ASME certified, material suppliers. certification to NB-2130 is not possible. Material traceability and Material Certification certification are maintained in accordance with TNs NRC approved NB-4121 QA program.
by Certificate Holder The shell to the outer top cover weld, the shell to the inner top cover/weld, the siphon/vent cover welds and the vent and siphon block welds to the shell are all partial penetration welds.
Category C weld As an alternative to the NDE requirements of NB-5230 for Category joints in vessels and C welds, all of these closure welds will be multi-layer welds and similar weld joints in receive a root and final PT examination, except for the shell to the other components outer top cover weld. The shell to the outer top cover weld will be a NB-4243 and shall be full multi-layer weld and receive multi-level PT examination in NB-5230 penetration joints.
accordance with the guidance provided in ISG-15 for NDE. The These welds shall multi-level PT Examination provides reasonable assurance that flaws be examined by UT of interest will be identified. The PT examination is done by qualified or RT and either PT personnel, in accordance with Section V and the acceptance or MT.
standards of Section III, Subsection NB-5000. All of these welds will be designed to meet the guidance provided in ISG-15 for stress reduction factor.
Standardized NUHOMS System ASME Code Alternatives Renewed C-20 Amendment 18
Table C-11 ASME Code Alternatives for the NUHOMS-61BTH DSC Confinement Boundary Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article The 61BTH is not a complete or installed pressure vessel until the top closure is welded following placement of Fuel Assemblies within the DSC. Due to the inaccessibility of the shell and lower end closure welds following fuel loading and top closure welding, as an alternative, the pressure testing of the DSC is performed in two parts.
The DSC shell (including all longitudinal and circumferential welds) is pressure tested and examined at the fabrication facility.
The shell to the inner top cover closure weld are pressure tested and All completed examined for leakage in accordance with NB-6300 in the field.
NB-6100 and pressure retaining The siphon/vent cover welds are not pressure tested; these welds 6200 systems shall be and the shell to the inner top cover closure weld are helium leak pressure tested.
tested after the pressure test.
Per NB-6324 the examination for leakage shall be done at a pressure equal to the greater of the design pressure or three-fourths of the test pressure. As an alternative, if the examination for leakage of these field welds, following the pressure test, is performed using helium leak detection techniques, the examination pressure may be reduced to 1.5 psig. This is acceptable given the significantly greater sensitivity of the helium leak detection method.
No overpressure protection is provided for the NUHOMS DSCs.
The function of the DSC is to contain radioactive materials under Overpressure normal, off-normal and hypothetical accident conditions postulated to NB-7000 Protection occur during transportation and storage. The DSC is designed to withstand the maximum possible internal pressure considering 100%
fuel rod failure at maximum accident temperature.
The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NB-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
NDE personnel must be qualified to Permit use of the Recommended Practice SNT-TC-1A to include up NB-5520 a specific edition of to the most recent 2011 edition.
SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-21 Amendment 18
Table C-12 ASME Code Alternatives for the NUHOMS-61BTH DSC Basket Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.b may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NG/NF-1100 Components, Code the fabricator is not required to hold an ASME N or NPT stamp, or reports and to be ASME Certified.
certificates, etc.
Some baskets include neutron absorber and aluminum plates that are not ASME Code Class 1 material. They are used for criticality safety and heat transfer, and are only credited in the structural analysis with supporting their own weight and transmitting bearing Use of ASME loads through their thickness. Material properties in the ASME Code NG/NF-2000 Material for Type 6061 aluminum are limited to 400 °F to preclude the potential for annealing out the hardening properties. Annealed properties (as published by the Aluminum Association and the American Society of Metals) are conservatively assumed for the aluminum transition rails for use above the Code temperature limits.
Material must be Material is certified to meet all ASME Code criteria but is not eligible supplied by ASME for certification or Code Stamping if a non-ASME fabricator is used.
NG/NF-2130 approved material As the fabricator is not required to be ASME certified, material suppliers. certification to NG/NF-2130 is not possible. Material traceability and Material Certification certification are maintained in accordance with TNs NRC approved NG/NF-4121 QA program.
by Certificate Holder The fuel compartment tubes may be fabricated from sheet with full penetration seam weldments. Per Table NG-3352-1 a joint efficiency (quality) factor of 0.5 is to be used for full penetration weldments examined in accordance with ASME Section V visual examination (VT). A joint efficiency (quality) factor of 1.0 is utilized for the fuel Table NG-3352-1 compartment longitudinal seam welds (if present) with VT lists the permissible examination. This is justified because the compartment seam weld is NG-3352 welded joints and thin and the weldment is made in one pass; and both surfaces of the quality factors. weldment (inside and outside) receive 100% VT examination. The 0.5 quality factor, applicable to each surface of the weldment, results is a quality factor of 1.0 since both surfaces are 100% examined. In addition, the fuel compartments have no pressure retaining function and the stainless steel material that comprises the fuel compartment tubes is very ductile.
Standardized NUHOMS System ASME Code Alternatives Renewed C-22 Amendment 18
Table C-12 ASME Code Alternatives for the NUHOMS-61BTH DSC Basket Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article Tack welds used to Along with the option to fully comply with NG-4231.1, if practicable, secure alignment the proposed alternative option to Paragraph NG-4231.1 is as shall either be follows:
removed The use of a qualified inspector to perform the VT examination completely, when required by NG-4231.1 may be omitted for the welds of R45 they have served Transition Rails of the NUHOMS 61BTH Type 2 DSC when the their purpose, or following additional requirements are met:
their stopping and 1. The welder or weld supervisor shall check the tack welds for starting ends shall defects per NG-4231.1 and shall either remove or repair the be properly defective tack welds in the process of fit-up and alignment.
prepared by 2. The welding procedure specification (WPS) and procedure grinding or other qualification record (PQR) of the production welds shall means so that they contain the following additional qualification requirements for may be satisfactorily each joint geometry:
incorporated into the A. Three coupons shall be prepared that simulate the joint NG-4231.1 final weld. Tack geometry that will be used in production. A tack weld shall welds shall be made be completed and broken.
by qualified welders B. The weld shall be completed with parameters that result in using qualified weld the minimum weld filler deposition rate allowed by the procedures. When WPS.
tack welds are to C. The coupons shall be cross-sectioned, etched, and become part of verified under magnification that the weld has satisfactorily finished weld, they incorporated the tack weld and the defect has been shall be visually removed.
examined in
- 3. An additional PQR shall be prepared in accordance with accordance with ASME Section IX with coupons that were produced with three NG-5261 and broken tack welds per coupon at fit-up. The coupons shall defective tack welds pass all applicable testing requirements of ASME Section IX.
shall be removed.
- 4. Production welds shall be made by either an automated welding or mechanized welding process. Only the tack weld may be completed by manual processes.
The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NG/NF-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
NDE personnel must be qualified to Permit use of the Recommended Practice SNT-TC-1A to include up NG/NF-5520 a specific edition of to the most recent 2011 edition.
SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-23 Amendment 18
Table C-13 Alternatives to the ASME Code for the NUHOMS 37PTH DSC Confinement Boundary Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 71 Subpart H in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code NCA-1140 editions and Materials produced and certified in accordance with ASME Section II addenda. material specification from Code Editions and Addenda other than those specified in CoC Section II.1.b may be used, so long the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NB-1100 Components, Code the fabricator is not required to hold an ASME N or NPT stamp, or reports and to be ASME Certified.
certificates, etc.
Material must be supplied by ASME Material is certified to meet all ASME Code criteria but is not eligible NB-2130 for certification or Code Stamping if a non-ASME fabricator is used.
approved material suppliers. As the fabricator is not required to be ASME certified, material certification to NB-2130 is not possible. Material traceability and Material Certification certification are maintained in accordance with TNs NRC approved NB-4121 by Certificate QA program.
Holder.
The shell to the outer top cover weld, the shell to the inner top cover weld (including optional design configurations for the inner top cover as described in the 37PTH DSC drawings), the siphon/vent cover welds, and the vent and siphon block welds to the shell are all partial Category C weld penetration welds. As an alternative to the NDE requirements of NB-joints in vessels and 5230, for Category C welds, all of these closure welds are multi-layer similar weld joints in welds and receive a root and final PT examination, except for the other components shell to the outer top cover weld. The shell to the outer top cover NB-4243 and shall be full weld will be a multi-layer weld and receive multi-level PT examination NB-5230 penetration joints.
in accordance with the guidance provided in ISG-15 (which is These welds shall incorporated in NUREG-1536, Revision 1) for NDE. The multi-level be examined by UT PT examination provides reasonable assurance that flaws of interest or RT and either PT will be identified. The PT examination is done by qualified personnel, or MT.
in accordance with Section V and the acceptance standards of Section III, Subsection NB-5000. All of these welds are designed to meet the guidance provided in ISG-15 (which is incorporated in NUREG-1536, Revision 1) for stress reduction factor.
Attachments with a Bottom shield plug and outer bottom cover plate are outside code pressure retaining jurisdiction; these components together are much larger than function, including NB-1132 required to provide stiffening for the inner bottom cover plate; the stiffeners, shall be weld that retains the outer bottom cover plate and with it the bottom considered part of shield plug is subject to root and final PT examination.
the component.
Standardized NUHOMS System ASME Code Alternatives Renewed C-24 Amendment 18
Table C-13 Alternatives to the ASME Code for the NUHOMS 37PTH DSC Confinement Boundary Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article The NUHOMS 37PTH DSC is not a complete vessel until the top closure is welded following placement of fuel assemblies within the DSC. Due to the inaccessibility of the shell and lower end closure welds following fuel loading and top closure welding, as an alternative, the pressure testing of the DSC is performed in two parts.
The DSC shell and inner bottom plate/forging (including all longitudinal and circumferential welds) are pressure tested and examined at the fabrication facility.
All pressure The shell to the inner top cover/shield plug closure weld (including retaining optional design configurations for the inner top cover as described in components and the 37PTH DSC drawings) is pressure tested and examined for completed systems leakage in accordance with NB-6300 in the field.
NB-6100 shall be pressure and 6200 The siphon/vent cover welds are not pressure tested; these welds tested. The and the shell to the inner top cover/shield plug closure weld preferred method (including Optional design configurations for the inner top cover as shall be hydrostatic described in the 37PTH DSC drawings) are helium leak tested after test.
the pressure test.
Per NB-6324 the examination for leakage shall be done at a pressure equal to the greater of the design pressure or three-fourths of the test pressure. As an alternative, if the examination for leakage of these field welds, following the pressure test, is performed using helium leak detection techniques, the examination pressure may be reduced to 1.5 psig. This is acceptable given the significantly greater sensitivity of the helium leak detection method.
No overpressure protection is provided for the NUHOMS DSCs.
The function of the DSC is to contain radioactive materials under Overpressure normal, off-normal and hypothetical accident conditions postulated to NB-7000 Protection occur during transportation and storage. The DSC is designed to withstand the maximum possible internal pressure considering 100%
fuel rod failure at maximum accident temperature.
The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NB-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
NDE Personnel must be qualified to Permit use of the Recommended Practice SNT-TC-1A to include up NB-5520 a specific edition of to the most recent 2011 edition.
SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-25 Amendment 18
Table C-14 Alternatives to the ASME Code for the NUHOMS 37PTH DSC Basket Assembly Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 71 Subpart H in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code NCA-1140 editions and Materials produced and certified in accordance with ASME Section II addenda. material specification from Code Editions and Addenda other than those specified in CoC Section II.1.b may be used, so long the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NG-1100 Components, Code the fabricator is not required to hold an ASME N or NPT stamp, or reports and to be ASME Certified.
certificates, etc.
Baskets include neutron absorber and aluminum plates that are not ASME Code Class 1 material. They are used for criticality safety and heat transfer, and are only credited in the structural analysis with supporting their own weight and transmitting bearing loads through Use of ASME their thickness. Material properties in the ASME Code for Type 6061 NG-2000 Material. aluminum are limited to 400 °F to preclude the potential for annealing out the hardening properties. Annealed properties (as published by the Aluminum Association and the American Society of Metals) are conservatively assumed for the aluminum transition rails for use above the Code temperature limits.
Material must be supplied by ASME Material is certified to meet all ASME Code criteria but is not eligible NG-2130 for certification or Code Stamping if a non-ASME fabricator is used.
approved material suppliers. As the fabricator is not required to be ASME certified, material certification to NG-2130 is not possible. Material traceability and Material Certification certification are maintained in accordance with TNs NRC approved NG-4121 by Certificate QA program.
Holder.
The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NG-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
NDE Personnel must be qualified to Permit use of the Recommended Practice SNT-TC-1A to include up NG-5520 a specific edition of to the most recent 2011 edition.
SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-26 Amendment 18
Table C-15 ASME Code Alternatives for the NUHOMS-69BTH DSC Confinement Boundary Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 71 Subpart H in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before those specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda. those specified in CoC Section II.1.b may be used, as long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NB-1100 Components, Code the fabricator is not required to hold an ASME N or NPT stamp, or reports and to be ASME Certified.
certificates, etc.
Attachments with a Bottom shield plug and outer bottom cover plate are outside code pressure retaining jurisdiction; these components together are much larger than function, including NB-1132 required to provide stiffening for the inner bottom cover plate; the stiffeners, shall be weld that retains the outer bottom cover plate and with it the bottom considered part of shield plug is subject to root and final PT examination.
the component.
Material must be supplied by ASME Material is certified to meet all ASME Code criteria but is not eligible NB-2130 for certification or Code Stamping if a non-ASME fabricator is used.
approved material suppliers. As the fabricator is not required to be ASME certified, material certification to NB-2130 is not possible. Material traceability and Material Certification certification are maintained in accordance with TNs NRC approved NB-4121 by Certificate QA program.
Holder.
The shell to the outer top cover weld, the shell to the inner top cover weld (including optional design configurations for the inner top cover as described in the 69BTH DSC drawings), the siphon/vent cover welds and the vent and siphon block welds to the shell are all partial Category C weld penetration welds.
joints in vessels and As an alternative to the NDE requirements of NB-5230 for Category similar weld joints in C welds, all of these closure welds will be multi-layer welds and other components receive a root and final PT examination, except for the shell to the NB-4243 and shall be full outer top cover weld. The shell to the outer top cover weld will be a NB-5230 penetration joints. multi-layer weld and receive multi-level PT examination in These welds shall accordance with the guidance provided in ISG-15 (which is be examined by UT incorporated in NUREG-1536, Revision 1) for NDE. The multi-level or RT and either PT PT Examination provides reasonable assurance that flaws of interest or MT. will be identified. The PT examination is done by qualified personnel, in accordance with Section V and the acceptance standards of Section III, Subsection NB-5000. All of these welds will be designed to meet the guidance provided in ISG-15 (which is incorporated in NUREG-1536, Revision 1) for stress reduction factor.
Standardized NUHOMS System ASME Code Alternatives Renewed C-27 Amendment 18
Table C-15 ASME Code Alternatives for the NUHOMS-69BTH DSC Confinement Boundary Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article The 69BTH is not a complete or installed pressure vessel until the top closure is welded following placement of Fuel Assemblies within the DSC. Due to the inaccessibility of the shell and lower end closure welds following fuel loading and top closure welding, as an alternative, the pressure testing of the DSC is performed in two parts.
The DSC shell (including all longitudinal and circumferential welds) is pressure tested and examined at the fabrication facility.
The shell to the inner top cover closure weld are pressure tested and All completed examined for leakage in accordance with NB-6300 in the field.
NB-6100 and pressure retaining The siphon/vent cover welds are not pressure tested; these welds 6200 systems shall be and the shell to the inner top cover closure weld are helium leak pressure tested.
tested after the pressure test.
Per NB-6324 the examination for leakage shall be done at a pressure equal to the greater of the design pressure or three-fourths of the test pressure. As an alternative, if the examination for leakage of these field welds, following the pressure test, is performed using helium leak detection techniques, the examination pressure may be reduced to 1.5 psig. This is acceptable given the significantly greater sensitivity of the helium leak detection method.
No overpressure protection is provided for the NUHOMS DSCs.
The function of the DSC is to contain radioactive materials under Overpressure normal, off-normal and hypothetical accident conditions postulated to NB-7000 Protection. occur during transportation and storage. The DSC is designed to withstand the maximum possible internal pressure considering 100%
fuel rod failure at maximum accident temperature.
The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NB-8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
NDE Personnel must be qualified to Permit use of the Recommended Practice SNT-TC-1A to include up NB-5520 a specific edition of to the most recent 2011 edition.
SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-28 Amendment 18
Table C-16 ASME Code Alternatives for the NUHOMS-69BTH DSC Basket Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 71 Subpart H in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.b may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.b table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda. those specified in CoC Section II.1.b may be used, so long the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
Requirements for Code Stamping of Code Stamping is not required. As Code Stamping is not required, NG/NF-1100 Components, Code the fabricator is not required to hold an ASME N or NPT stamp, or reports and to be ASME Certified.
certificates, etc.
Some baskets include neutron absorber and aluminum plates that are not ASME Code Class 1 material. They are used for criticality safety and heat transfer, and are only credited in the structural analysis with supporting their own weight and transmitting bearing Use of ASME loads through their thickness. Material properties in the ASME Code NG/NF-2000 Material. for Type 6061 aluminum are limited to 400 °F to preclude the potential for annealing out the hardening properties. Annealed properties (as published by the Aluminum Association and the American Society of Metals) are conservatively assumed for the aluminum transition rails for use above the Code temperature limits.
Material must be supplied by ASME Material is certified to meet all ASME Code criteria but is not eligible NG/NF-2130 for certification or Code Stamping if a non-ASME fabricator is used.
approved material suppliers. As the fabricator is not required to be ASME certified, material certification to NG/NF-2130 is not possible. Material traceability and Material Certification certification are maintained in accordance with TNs NRC approved NG/NF-4121 by Certificate QA program.
Holder.
The fuel compartment tubes may be fabricated from sheet with full penetration seam weldments. Per Table NG-3352-1 a joint efficiency (quality) factor of 0.5 is to be used for full penetration weldments examined in accordance with ASME Section V visual examination (VT). A joint efficiency (quality) factor of 1.0 is utilized for the fuel Table NG 3352-1 compartment longitudinal seam welds (if present) with VT lists the permissible examination. This is justified because the compartment seam weld is NG-3352 welded joints and thin and the weldment is made in one pass; and both surfaces of the quality factors. weldment (inside and outside) receive 100% VT examination. The 0.5 quality factor, applicable to each surface of the weldment, results is a quality factor of 1.0 since both surfaces are 100% examined. In addition, the fuel compartments have no pressure retaining function and the stainless steel material that comprises the fuel compartment tubes is very ductile.
The NUHOMS DSC nameplate provides the information required by Requirements for 10 CFR Part 71, 49 CFR Part 173 and 10 CFR Part 72 as nameplates, NG/NF -8000 appropriate. Code stamping is not required for the DSC. QA data stamping & reports packages are prepared in accordance with the requirements of TNs per NCA-8000.
approved QA program.
Standardized NUHOMS System ASME Code Alternatives Renewed C-29 Amendment 18
Table C-16 ASME Code Alternatives for the NUHOMS-69BTH DSC Basket Reference ASME Code Code Requirement Alternatives, Justification & Compensatory Measures Section/Article NDE Personnel must be qualified to Permit use of the Recommended Practice SNT-TC-1A to include up NG/NF-5520 a specific edition of to the most recent 2011 edition.
SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-30 Amendment 18
Table C-17 ASME Code Alternatives for the Standardized NUHOMS System TCs Except for the OS200 and OS200FC TCs (Applies to TC structural components only; lead shielding, neutron shielding, and neutron shield jacket of the TC are not addressed by this table)
Reference ASME Code Code Requirement Exception, Justification and Compensatory Measures Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.c may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.c table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.c may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
NC-1100 Requirements for The cask is designed and fabricated to the requirements of Code Stamping of Subsection NC, to the maximum extent practical. However, the TC Components. does not have a Code stamp. Code Stamping is not required by 10 CFR Part 72 regulation. Therefore, the fabricator is not required to be ASME Certified.
NC-2000 ASME Code The Cask bottom ram access cover plate is made of ASTM A240, a Materials are to be non-ASME material. This cover plate is a watertight closure used used. during fuel LOADING/UNLOADING OPERATIONS in the fuel/reactor building only. This is not a pressure boundary component, and its failure does not result in any public safety concerns.
NC-2130 Material must be Materials designated as ASME on UFSAR Appendix E drawings are supplied by ASME obtained by TN approved suppliers with Certified Material Test approved material Reports (CMTRs). Material is certified to meet all ASME Code suppliers. criteria but is not eligible for Certification or Code Stamping, if a non-ASME fabricator is used. As the fabricator is not required to be ASME certified, material certification to NC-2130 is not possible.
NC-4120 Material Certification Material traceability & certification are maintained in accordance with by Certificate Holder TNs NRC approved QA program.
NC-4240 Full penetration The joint between the ram access penetration forging and the bottom welds are required end plate consists of partial penetration welds, while NC-3200 would for pressure require full penetration welds. This cover plate is a watertight closure boundary closure used during fuel LOADING/UNLOADING OPERATIONS in the joints. fuel/reactor building only. This is not a pressure boundary component, and its failure does not result in any public safety concerns.
NC-5250 Category A and B UFSAR Appendix E drawing NUH-03-8001 permits weld examination joints shall be fully of (a) the circumferential and longitudinal welds for the structural radiographed. shell and (b) the weld between the bottom end plate and the bottom support ring to be done using radiography (RT) or ultrasound (UT) while NC-5250 allows full penetration welds to be examined by RT only. Since the structural shell is not a pressure boundary, this code exception is acceptable.
NC-6000 All completed With respect to pressure testing requirements, the TC is considered pressure retaining a non-pressure retaining component. Therefore, no pressure testing systems shall be is required. However, the liquid neutron shield cavity, cask bottom pressure tested. neutron shield cavity, and the bottom cover plate assembly are pressure and leak tested.
Standardized NUHOMS System ASME Code Alternatives Renewed C-31 Amendment 18
Table C-17 ASME Code Alternatives for the Standardized NUHOMS System TCs Except for the OS200 and OS200FC TCs (Applies to TC structural components only; lead shielding, neutron shielding, and neutron shield jacket of the TC are not addressed by this table)
Reference ASME Code Code Requirement Exception, Justification and Compensatory Measures Section/Article NC-7000 Overpressure The TC is considered a non-pressure retaining component.
Protection Therefore, no overpressure protection is provided for the TC, except that a pressure relief valve is provided for the annular neutron shielding.
NC-8000 Requirements for The TC nameplate provides the information required by 10 CFR Part nameplates, 72. Code stamping is not required for the TC. QA Data packages stamping & reports are prepared in accordance with the requirements of 10 CFR Part 72 per NCA-8000. and TNs NRC approved QA program.
NC-5520 NDE personnel Permit use of the Recommended Practice SNT-TC-1A to include up must be qualified to to the most recent 2011 edition.
a specific edition of SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-32 Amendment 18
Table C-18 ASME Code Alternatives for the Standardized NUHOMS System OS200 and OS200FC TCs (Applies to TC structural components only; lead shielding, neutron shielding, and neutron shield jacket of the TC are not addressed by this table.)
Reference ASME Code Code Requirement Alternatives, Exception, Justification & Compensatory Measures Section/Article Not compliant with NCA. Quality Assurance is provided according to NCA All 10 CFR Part 72 Subpart G in lieu of NCA-4000.
Code edition and addenda other than those specified in CoC Section II.1.c may be used for construction, but in no case earlier than 3 years before that specified in the CoC Section II.1.c table.
Use of Code Materials produced and certified in accordance with ASME Section II NCA-1140 editions and material specification from Code Editions and Addenda other than addenda those specified in CoC Section II.1.c may be used, so long as the materials meet all the requirements of Article 2000 of the applicable Subsection of the Section III Edition and Addenda used for construction.
The OS200/OS200FC TC is designed and fabricated to the Requirements for requirements of Subsection NC, to the maximum extent practical.
NC-1100 Code Stamping of However, the TC does not have a Code stamp. Code Stamping is Components not required by 10 CFR Part 72 regulation. Therefore, the fabricator is not required to be ASME Certified.
The TC bottom ram access cover plate is made of ASTM A240, a ASME Code non-ASME material. This cover plate is a watertight closure used NC-2000 Materials are to be during fuel LOADING/UNLOADING OPERATIONS in the fuel/reactor used. building only. This is not a pressure boundary component, and its failure does not result in any public safety concerns.
Materials designated as ASME on the UFSAR Chapter U.1 drawings Material must be are obtained by TN approved suppliers with Certified Material Test supplied by ASME Reports (CMTRs). Material is certified to meet all ASME Code NC-2130 approved material criteria but is not eligible for Certification or Code Stamping, if a non-suppliers. ASME fabricator is used. As the fabricator is not required to be ASME certified, material certification to NC-2130 is not possible.
Material Certification Material traceability & certification are maintained in accordance with NC-4120 by Certificate Holder TNs NRC approved QA program.
The trunnion-to-shell weld is a Category D joint which does not allow adequate UT or RT examination. This weld is not a pressure boundary but serves as lifting point for the TC. During fabrication, this weld is progressive PT examined and then load- tested to three Category D joints times the design load.
NC-5254 shall be RT or UT The weld between the ram access penetration forging and bottom examined.
end plate is a Category D joint which does not allow meaningful RT or UT examination. This weld is PT examined root and final layers.
This is not a pressure boundary component and its failure does not result in any public safety concerns.
With respect to pressure testing requirements, the TC is not a All completed pressure retaining component. Therefore, no pressure testing is pressure retaining NC-6000 required. However, the liquid neutron shield cavity, cask bottom systems shall be neutron shield cavity, and the bottom cover plate assembly are pressure tested.
pressure and leak tested.
The TC is not a pressure retaining component. Therefore, no Overpressure NC-7000 overpressure protection is provided for the TC, except that a Protection pressure relief valve is provided for the annular neutron shielding.
Standardized NUHOMS System ASME Code Alternatives Renewed C-33 Amendment 18
Table C-18 ASME Code Alternatives for the Standardized NUHOMS System OS200 and OS200FC TCs (Applies to TC structural components only; lead shielding, neutron shielding, and neutron shield jacket of the TC are not addressed by this table.)
Reference ASME Code Code Requirement Alternatives, Exception, Justification & Compensatory Measures Section/Article Requirements for The TC nameplate provides the information required by 10 CFR Part nameplates, 72. Code stamping is not required for the TC. QA data packages NC-8000 stamping & reports are prepared in accordance with the requirements of 10 CFR Part 72 per NCA-8000. and TNs NRC approved QA program.
NDE personnel must be qualified to Permit use of the Recommended Practice SNT-TC-1A to include up NC-5520 a specific edition of to the most recent 2011 edition.
SNT-TC-1A.
Standardized NUHOMS System ASME Code Alternatives Renewed C-34 Amendment 18