ML24256A046
| ML24256A046 | |
| Person / Time | |
|---|---|
| Site: | 07201004 |
| Issue date: | 09/05/2024 |
| From: | Orano TN Americas |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML24256A043 | List: |
| References | |
| Download: ML24256A046 (1) | |
Text
Public Version CoC 1004 Amendment 19TN Americas Pre-Application Meeting
September 2024 Agenda
- Purpose of Meeting
- Scope of Amendment
- Structural Analysis Summary
- Thermal Analysis Summary
- Shielding Analysis Summary
- Criticality Analysis Summary
- Other Scope Items
- Schedule
- Questions / Open Discussion
2 TN Americas CoC Amd 19 Pre-Application Meeting Purpose of Meeting
- To present TN Americas proposed methodology for performing structural, thermal, shielding, and criticality analysis for BWR fuel assemblies loaded into the newly designed NUHOMS 61BTH Type 3 DSC.
- Briefly discuss other scope items.
- Provide an opportunity to receive NRC feedback and facilitate planning prior to submittal of Amendment No. 19 to CoC 1004.
- Achieve clear, common understanding of the path forward for Amendment No. 19 regarding scope and schedule.
3 TN Americas CoC Amd 19 Pre-Application Meeting Primary Scope
Develop a new basket for the NUHOMS 61BTH (Type 3) which will satisfy all requirements for the NUHOMS 61BTH system as specified in the Technical Specifications (TS) for CoC 1004. These requirements include but are not limited to the following items:
- A new bounding HLZC for the Type 3 that will allow a maximum head load up to 33.6 kWenveloping all previous HLZCs for the Type 2
- Capability of loading up to 4 damaged and/or failed fuel assemblies per DSC
- Maximum burnup of 62 GWd/MTU and maximum initial enrichment of 5.0 wt%
4 TN Americas CoC Amd 19 Pre-Application Meeting Primary Scope
The new NUHOMS 61BTH Type 3 basket implements the EOS-style design [
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- This is the same basket style that was used for the NUHOMSEOS-37PTH and EOS-89BTH (CoC 1042) as well as the NUHOMS 24PTH Type 3 (Amendment 18 of CoC 1004). [
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- The Type 3 DSC shell will be based on the existing Type 2 DSC shell with only minor modifications in order to accommodate the new Type 3 basket. All major dimensions including length and diameter will remain unchanged.
5 TN Americas CoC Amd 19 Pre-Application Meeting Primary Scope
6 TN Americas CoC Amd 19 Pre-Application Meeting Structural Summary
Methodology
- Structural evaluation is based on the approved methodologies for NUHOMS 24PTH Type 3 DSC basket from CoC 1004 Amendment 18 as well as for NUHOMS EOS-37PTH and EOS-89BTH from CoC 1042
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- Bounding normal/off-normal loads: Dead weight + Handling (basket in horizontal position) + Thermal
- Accident loads: 75g side drop
- Criteria:
- ASME Boiler and Pressure Vessel Code,Section III, Division 1, Subsection NG
- Strain criteria: Steel grid plates under accident conditions
7 TN Americas CoC Amd 19 Pre-Application Meeting Structural Summary
The structural evaluation of the 61BTH Type 3 considers the following inputs:
- Bounding BWR fuel weight assembly
- Bounding thermal load conditions: storage and transfer
Structural Results (preliminary)
- Basket stresses and strains meet the criteria for both normal/off-normal and accident loading conditions
8 TN Americas CoC Amd 19 Pre-Application Meeting Thermal Summary
The 61BTH Type 3 basket design includes various features to improve the thermal performance such as:
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Thermal performance of the 61BTH Type 3 basket assembly is evaluated under the storage and transfer conditions
- HLZC#14 (33.6kW) is the bounding heat load configuration for thermal evaluation due to its FA storage arrangement and heat load
- Bounding storage condition is the normal storage condition in HSM-H with wind
- Bounding transfer condition is the off-normal transfer condition in OS197 TC
9 TN Americas CoC Amd 19 Pre-Application Meeting Thermal Summary
Methodology
- Storage evaluation, as well as transfer evaluation, are based on reviewed and accepted models and analyses for 24PTH DSC in HSM-H and OS197, respectively, from CoC 1004 Amendment 18
- Coupled DSC/HSM-H and DSC/TC models in ANSYS Fluent
- Grid convergence index (GCI) study has been provided
Thermal Results (preliminary)
- With bounding heat load of33.6 kW, the specified time limit for transfer operation is 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />
- Maximum fuel cladding temperatures are within the temperature limits in the current UFSAR under all operating conditions
- Maximum internal pressures are within the pressure limits in the current UFSAR under all operating conditions
10 TN Americas CoC Amd 19 Pre-Application Meeting Shielding Summary
The shielding HLZC, UFSAR Table T.5-1a, introduced in Amendment 17 bounds all the 13 HLZCs and new HLZC 14 for 61BTH DSCs therefore no further shielding analysis is performed
HLZC 14 -0.48 kW Zone1 and 0.6 kW Zone 2
UFSAR Table T.5-1a 11 TN Americas CoC Amd 19 Pre-Application Meeting Criticality Summary
Fresh Fuel Assumption
- Fresh fuel assumption (reviewed and approved method through past CoC 1004 Amendments and CoC 1042 Amendments)
- Criticalityanalysis performed for bounding fuel GE 10x10 in 61BTH Type 3
Gadolinium Credit
- Fresh fuel assumption with credit to fuel rods containing gadolinium oxide (Gd2O3)
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12 TN Americas CoC Amd 19 Pre-Application Meeting Criticality Summary
Overview of the gadolinium credit method
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Computer code
- SCALE 6.1.3 and ENDF/B-VII nuclear data library
- New benchmark including UO2-Gd2O2 critical experiments
13 TN Americas CoC Amd 19 Pre-Application Meeting Criticality Results(Preliminary)
- Fresh fuel assumption -61BTH Type 3 GE 10x10 up to 4.9 wt%
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14 TN Americas CoC Amd 19 Pre-Application Meeting Other Scope Items
Add an ASME code alternative for NB/NG-4323 to Technical Specifications Table C-12 for welder qualification.
The alternative will state that in lieu of this requirement, a full UT evaluation of the joint may be performed to ensure adequacy of the weld.
15 TN Americas CoC Amd 19 Pre-Application Meeting Submittal Schedule
Application Submittal -November 2024
Requested Approval - November 2026
16 TN Americas CoC Amd 19 Pre-Application Meeting Questions/ Open Discussion
17 TN Americas CoC Amd 19 Pre-Application Meeting