ML22094A200
| ML22094A200 | |
| Person / Time | |
|---|---|
| Site: | 07201004 |
| Issue date: | 04/01/2022 |
| From: | Huilung Liu, Migliore R, Sunwoo Park, Stefanick J, Yates D Orano USA |
| To: | Office of Nuclear Material Safety and Safeguards |
| W ALLEN NRC/NMSS/DFM/STLB 3014156877 | |
| Shared Package | |
| ML22094A199 | List: |
| References | |
| Download: ML22094A200 (18) | |
Text
Public Version TN Americas CoC 1004 Amendment 18 Pre-Application Meeting April 2022 Jake Stefanick Si-Hwan Park Hui Liu Rick Migliore Doug Yates
2 Agenda
Background
Scope of Amendment Structural Analysis Summary Thermal Analysis Summary Shielding Analysis Summary Criticality Analysis Summary Clarification/Simplification Items Schedule Proprietary Questions / Open Discussion TN Americas CoC Amd 18 Pre-Application Meeting
3 Introduction
Purpose of Meeting
- To present TN Americas proposed methodology for performing structural, thermal, and criticality analysis for PWR fuel assemblies loaded into the newly designed NUHOMS 24PTH Type 3 DSC.
- Briefly discuss other scope items.
- Provide an opportunity to receive NRC feedback and facilitate planning prior to submittal of Amendment No. 18 to CoC 1004.
- Achieve clear, common understanding of the path forward for Amendment No. 18 regarding scope and schedule.
TN Americas CoC Amd 18 Pre-Application Meeting
4 Primary Scope
Develop a [
] basket design (similar to EOS-37PTH) to interface with the existing NUHOMS 24PTH DSC shell
- Satisfy all requirements for NUHOMS 24PTH system as specified in the Technical Specification (TS) for CoC 1004. These requirements include but are not limited to the following items:
- Heat loads per HLZCs shown in TS Figure 1-11 through 1-15a
- Capability to load maximum 12 damaged fuel assemblies per TS Figure 1-16
- Capability to load maximum 8 failed fuel assemblies per TS Figure 1-16
- Maximum burnup of 62 GWd/MTU and maximum initial enrichment of 5% per TS Table 1-1l
Add an alternate [
] bottom for 24PTH-S-LC DSC
Add an alternate to the Top Shield Plug (TSP) for 24PTH-S-LC [
]
Maintain the maximum critical lift weight of a loaded transfer cask to 200 kips (100 t) for a 24PTH-S-LC System TN Americas CoC Amd 18 Pre-Application Meeting
5 Alternate [ ] Bottom TN Americas CoC Amd 18 Pre-Application Meeting
6 Alternate Top Shield Plug TN Americas CoC Amd 18 Pre-Application Meeting
7 Structural Summary 24PTH Type 3 basket design:
Consisting of EOS-style [
]
structure for basket compartments
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]
[
]
[
]
[
]
Structural evaluation of 24PTH Type 3 basket assembly:
Bounding fuel assembly weight Bounding weight for 24PTH-S, 24PTH-L and 24PTH-S-LC DSC basket Bounding thermal load: Storage and transfer conditions TN Americas CoC Amd 18 Pre-Application Meeting
8 Structural Summary Methodology Structural evaluation is based on the approved methodologies for EOS-37PTH DSC basket from CoC 1042 Amendment 0 and 1
[
]
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 Structural Evaluation Results Stresses and strains meet the criteria for both normal/off-normal and accident loading conditions TN Americas CoC Amd 18 Pre-Application Meeting
9 Thermal Summary The 24PTH Type 3 basket design includes various features to improve the thermal performance such as:
[
]
[
]
[
]
[
]
Thermal performance of the 24PTH Type 3 basket assembly is evaluated for the 24PTH-S, 24PTH-L and the 24PTH-S-LC DSCs 24PTH-S is the bounding DSC type for thermal evaluation due to its smallest basket length Bounding storage condition is the normal storage condition in HSM-H Bounding transfer condition is the normal transfer condition in OS197 TC TN Americas CoC Amd 18 Pre-Application Meeting
10 TN Americas CoC Amd 18 Pre-Application Meeting Thermal Summary Methodology Storage evaluation is based on reviewed and accepted models and analyses for 32PTH1 DSC in HSM-H from CoC 1004 Amendment 15 and EOS-37PTH DSC in EOS-HSM from CoC 1042 Amendment 0 and 1 Transfer evaluation is based on reviewed and accepted models and analyses for 61BTH DSC in OS197 from CoC 1042 Amendment 2 Coupled DSC/HSM-H and DSC/TC models in ANSYS Fluent Grid convergence index (GCI) study has been provided Thermal Results (preliminary)
No change to the specified time limits in the current UFSAR Maximum fuel cladding temperatures are bounded by the values in the current UFSAR Maximum internal pressure are bounded by the value in the current UFSAR
11 Shielding Summary The 24PTH-L and 24PTH-S-LC MCNP cask models are updated for the Type 3 basket design. The 24PTH-S-LC cask model is also updated for the fabrication changes in the shield plugs.
[
] Therefore, cask side dose rates decrease for the Type 3 basket design.
Because vent dose rates in the storage condition are dominated by radiation that exits the side of the DSC, horizontal storage module (HSM) vent dose rates decrease for the Type 3 basket design. No HSM calculations are performed.
TN Americas CoC Amd 18 Pre-Application Meeting
12 Shielding Summary
[
] Therefore, centerline dose rates at the top and bottom of the cask increase for the Type 3 design.
- Overall increase in occupational exposure is 3%, which is negligible.
- Increase ITE cask top dose rate limit in the welding configuration [
]
- Increase the door centerline dose rate limit for the 24PTH-S-LC [
]
- The remaining ITE dose rate limits are unchanged.
Note: Dose rates are preliminary.
TN Americas CoC Amd 18 Pre-Application Meeting
13 Criticality Summary A sensitivity study is performed to demonstrate that basket Type 3D is bounded by the basket type 1C/2C enrichment limits currently provided in the technical specifications.
- [
]
- [
]
- The delta in k-effective is approximately 0.015 for all intact, damaged, and failed fuel cases considered.
TN Americas CoC Amd 18 Pre-Application Meeting
14 Clarification/Simplification Items Other Changes:
1.
As part of the 24PTH Type 3 basket :
Add new Appendix A ITE section 2.4 to address use of HSLA steel.
Increase maximum FA weight in Table 1-1l from 1682 lbs to 1750 lbs and delete total weight of FFC plus contents from Table 1-1l (as well as 1-1e and 1-1t) consistent with TS level of detail for FA weights in CoC 1029 and CoC 1042.
2.
Deletion of Appendix A ITE Section 4.4 requirement for initial HSM delta T measurement with a loaded DSC.
OE indicates this measurement is no longer needed to validate system performance and aligns with CoC 1042 TS level of detail.
3.
Clarifies Appendix A ITE Section 3.2 and Appendix B TS Section 4.3.2 language related to transfer cask liquid neutron shields Clarifies what text applies the OS197L TC.
Formatting only. No new content.
4.
Updated Appendix C ASME Code Alternatives Table C-12 to add approved code alternative NG-4231.1 (ML22025A169)
Administrative TN Americas CoC Amd 18 Pre-Application Meeting
15 Clarification Items(continued) 5.
Change Appendix B TS Section 4.3.2, first paragraph, by removing a reference to 10 CFR Part 20 to clarify language indicating that the site specific evaluation in accordance with 10 CFR 72.212 is to demonstrate compliance with 10 CFR 72.104.
Clarifies existing requirement only.
6.
Clarify TC/DSC annulus draining language in Appendix B TS Section 4.3 within the last paragraph.
Clarifies draining requirements language to indicate that the NS level should be monitored when draining the TC/DSC annulus as those two drain locations are close to one another.
7.
Clarify in Appendix B TS LCO 3.1.3 that there is no transfer time limit associated with the 24PTH-S-LC DSC as indicated in existing analysis and within the applicability section of bases B10 TS 3.1.3 of the UFSAR.
Clarifies transfer time based on existing UFSAR Appendix P thermal information. No new technical content.
8.
Editorially correct CoC name/address information by adding missing space between 7160 and Riverwood Drive.
Administrative.
TN Americas CoC Amd 18 Pre-Application Meeting
16 Submittal Schedule Application Submittal - May 2022 Requested approval - November 2023 TN Americas CoC Amd 18 Pre-Application Meeting
17 Questions/ Open Discussion TN Americas CoC Amd 18 Pre-Application Meeting