ML23283A143
| ML23283A143 | |
| Person / Time | |
|---|---|
| Site: | 07109294 |
| Issue date: | 10/10/2023 |
| From: | Global Nuclear Fuel |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML23283A139 | List: |
| References | |
| M230133 | |
| Download: ML23283A143 (1) | |
Text
ENCLOSURE 2 M230133 Closed Session Presentation Slides for New Powder Container Meeting GNF Proprietary Information - Non-Public PROPRIETARY INFORMATION NOTICE This enclosure contains proprietary information of Global Nuclear Fuel - Americas, LLC (GNF) and is furnished in confidence solely for the purpose(s) stated in the transmittal letter. No other use, direct or indirect, of the document or the information it contains is authorized. Furnishing this enclosure does not convey any license, express or implied, to use any patented invention or, except as specified above, any proprietary information of GNF disclosed herein or any right to publish the enclosure without prior written permission of GNF.
The header of each page in this enclosure carries the notation GNF Proprietary Information -
Non-Public. The GNF proprietary information is identified by double square brackets. ((This sentence is an example.{3})) Figures and large objects containing proprietary information are identified with double square brackets before and after the object. In each case, the superscript notation {3} refers to Paragraph (3) of the Enclosure 4 affidavit, which provides the basis for the proprietary determination.
Discussion with the NRC:
NPC Package Revised Technical Basis to Support 8 wt.% U-235 1
October 24, 2023 GNF Proprietary Information - Non-Public
START OF CLOSED SESSION GNF Proprietary Information - Non-Public
Overview of Current NPC Certification Testing Basis 3
GNF Proprietary Information - Non-Public
Goal For Today NRC feedback on in-progress changes to SAR Basis for credible conditions from HAC testing Revised Chapter 6 evaluation
((Submittal targeted for ~3Q 2024{3}))
4 GNF Proprietary Information - Non-Public
Proposed Changes to SAR
- Per 10 CFR 71.55 and 71.59, redefine ICCA flooding during HAC based on physical test data documented in Chapters 2 & 3 of the SAR
- Validation report update to support revised Upper Subcritical Limit (USL) update to
((0.9406{3}))
5 GNF Proprietary Information - Non-Public
NPC Certification Testing Review 6
GNF Proprietary Information - Non-Public
Certification Tests
- Four full-scale NPC Certification Test Units CTU-1 thru CTU-4 tested as follows:
- Free drop per 10 CFR 71.73(c)(1)
- Puncture test per 10 CFR 71.73(c)(3)
- Thermal testing per 10 CFR 71.73(c)(4); (except CTU-4)
- Immersion testing per 10 CFR 71.73(c)(5) and (c)(6); (except CTU-4)
- Demonstrated compliance to 10 CFR 71
- Demonstrated watertight through immersion testing
- Documented in SAR but not previously required due to assumed inleakage for criticality evaluation Certification Tests Summary 7
Testing and Results GNF Proprietary Information - Non-Public
Drop Testing Orientations CTU-2 8
CTU-3 CTU-1 CTU-4 GNF Proprietary Information - Non-Public
Immersion Testing 10 CFR 71.73(c)(5)
- CTU-2 had no evidence of inleakage following 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> of 3 ft immersion testing
- CTU-3 and CTU-1 had evidence of limited moderator intrusion in one ICCA each
- Cause of inleakage was identified and is mitigated through current package design and operation 10 CFR 71.73(c)(6)
- Nine undamaged ICCAs were immersed at 50 ft for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> with no evidence of inleakage 9
GNF Proprietary Information - Non-Public
Immersion Testing Continued
- CTU-2: No evidence of water intrusion.
- CTU-3: Deformation of OCA lid corner and ICCA closure lid due to drop testing. Evidence of limited water intrusion.
- Mitigation: Reinforced the corner soffits and tested as CTU-1 (current design).
- CTU-1: Evidence of limited water intrusion due to simulated payload (sand particles) migrating into ICCA closure seal during drop testing.
- Mitigation: Resolved by procedural handling in Chapter 7. Poly bottles are required for powder uranium compounds.
- CTU-4: No immersion testing performed. No leaked fluorescein identified.
10 GNF Proprietary Information - Non-Public
Testing Summary
- Damaged package remains watertight following free drop, puncture and fire testing demonstrated by 10 CFR 71.73(c)(5) immersion testing
- Undamaged ICCAs remain watertight demonstrated by 10 CFR 71.73(c)(6) immersion testing
- 10 CFR 71.73(c)(5) and (c)(6) immersion testing data will be used to justify modifications to inleakage assumptions in the criticality analysis 11 GNF Proprietary Information - Non-Public
Criticality Study - Scoping 12 GNF Proprietary Information - Non-Public
Conservative Assumption With the mitigating measures noted, it is credible that ((no{3})) ICCAs will flood during HAC For conservatism, ((up to two ICCAs{3})) in each NPC are assumed to leak (allow moderator intrusion with no material loss) 13 NPC package Keno model showing two flooded ICCAs Flooded Fuel ICCA Dry Fuel ICCA GNF Proprietary Information - Non-Public
((
{3}))
Scoping Assumptions
- Objective: Find limiting configuration of up ((two (2) flooded ICCAs{3}))
- ((Up to two (2) ICCAs are considered entirely flooded with full density H2O{3}))
- Three (3) Poly bottles are modeled within each ICCA 14 GNF Proprietary Information - Non-Public
15 Isometric View Top Cross-Section Side Cross-Section Scoping Results - Example Visualization Non-flooded fuel region Flooded fuel region Poly bottle material GNF Proprietary Information - Non-Public
((
{3}))
16 Intact Poly Bottles in Dry ICCA Modeling Approaches - Visualizations Poly bottle Fuel region Void region Intact Poly Bottles in Flooded ICCA Fuel Water Mixture Full density water Note that fuel mixture volume is held constant to occupy the full volume of each poly bottle GNF Proprietary Information - Non-Public
Modeling Results 17 GNF Proprietary Information - Non-Public
18 Modeling Approaches - 8 wt.% U-235 Maximum Content Case Results ICCAs Flooded Fuel Loading per ICCA k-eff k Margin Gained
((All 60 kg UO2 0.99575
- 1 + #2 60 kg UO2 0.83669 0.15906{3}))
1 2
3 4
5 6
7 8
9 All test cases used the following criteria:
5x6x5 array of HAC NPCs All NPCs in same orientation NPC package with ICCA numbering shown (ICCA #1 and
- 2 shown flooded)
Flooded Fuel ICCA Dry Fuel ICCA GNF Proprietary Information - Non-Public
((
{3}))
19 Modeling Approaches - 8 wt.% U-235 Case Results Note that fuel mixture volume is held constant to occupy the full volume of each poly bottle GNF Proprietary Information - Non-Public
((
{3}))
20 Summary of Analyses Credit results of certification testing documented in SAR NEDO-33881 Revision 7 Conservatively model up to ((2{3})) ICCAs flooded Increase allowed UO2 enrichment from 5 wt.% to 8 wt.% U-235 540 kg content per NPC (60 kg per ICCA) remains below USL of
((0.9406{3})) with ample margin Submittal ((~3Q 2024{3}))
GNF Proprietary Information - Non-Public
21 Proposed USA/9294/AF-96 Changes