Text

Encl 2: Publicly Available Presentation, Request for Amendment of USA/9380/B(U)F-96 for Model No. Traveller Std and Xl Packages
	ML21183A063
Person / Time
Site:	07109380
Issue date:	06/24/2021
From:	Millare B, Murphy C, Rochow H, Sloma-Delosier T, Stilwell W; Westinghouse
To:	; Office of Nuclear Reactor Regulation
	PSaverot NMSS/DFM/STL 301.415.7505
Shared Package
ML21183A061	List: ML21183A062; ML21183A063;
References
	Download: ML21183A063 (20)
	v • d • e

Westinghouse Non-Proprietary Class 3 1

Tanya Sloma-DeLosier, Package Licensing Program Manager and Criticality Safety Engineer Charlie Murphy, Criticality Safety Engineer (Daher-TLI)

Hawk Rochow, Mechanical Engineer (NovaTech)

Brian Millare, Mechanical Engineer Wes Stilwell, Nuclear Fuel Transport Director June 24, 2021 Request for Amendment of USA/9380/B(U)F-96 for Model No. Traveller STD and XL Packages

2 Westinghouse Non-Proprietary Class 3

Contents

Package image and overview

Application timeline / license summary

Overview of amendment contents

Review of the new Type B bottom support spacer drawing and mechanical evaluation

Structural and criticality methods for ATF content

Criticality methods for increased enrichment evaluations

Opportunity for public comments

Proprietary slides (separate)

3 Westinghouse Non-Proprietary Class 3

Traveller Package USA/9380/B(U)F-96 similar to USA/9297/AF-96

4 Westinghouse Non-Proprietary Class 3

Traveller License Summary & Application

USA/9380/B(U)F-96

- Certificate of Compliance Rev. 0 was issued Nov. 7, 2019

Amendment request will include all contents approved in USA/9297/AF-96 CoC Rev. 12/13 issued Sept. 15/29, 2020

Additional contents added specific for Type B content

Amendment application submittal planned for mid-July 2021

Westinghouse will request NRC approval by 31 January 2022

5 Westinghouse Non-Proprietary Class 3

Amendment Contents

Alternate bottom support spacer component design

- New mechanical analysis

- Packaging drawing revision

Rod Pipe drawing details

Structural / Thermal SAR revisions

- Cladding: chromium-coating and liner (OZL)

- Loose rod cladding: aluminum and stainless-steel

Criticality SAR revisions

- ADOPT UO2, 7% fuel rods, cladding materials

- 6% fuel assembly

Additional SAR revisions

6 Westinghouse Non-Proprietary Class 3

Amendment Contents -

Alternate Bottom Support Spacer

Background:

a new fuel assembly 4-legged skirted bottom nozzle design is underway

- For Type B content, fuel assemblies with a 4-legged bottom nozzle require a bottom support spacer

The current bottom support spacer design interferes with inner pockets of new skirted nozzle design. An alternate skirted nozzle support spacer is needed.

Objective: Demonstrate skirted nozzle support spacer configuration results in an essentially identical Traveller package and fuel assembly (including fuel rod) mechanical response as the current bottom nozzle support spacer after the 9-meter HAC drop test.

7 Westinghouse Non-Proprietary Class 3

Current Bottom Nozzle and Support Spacer Illustration of standard 4-legged bottom nozzle and current bottom nozzle support spacer 4-legged Bottom Nozzle Current bottom nozzle support spacer. Note boss to accommodate shipping pads

8 Westinghouse Non-Proprietary Class 3

Spacer 10076E67G03 protrudes past ADFBN pocket by 0.851, 2 places Spacer 10076E67G03 protrudes past nozzle pocket by 0.950, 2 places Clamshell Closed corner Clamshell Open corner Nozzle Interference with Current Support Spacer Current support spacer under new 4-leg skirted nozzle showing interference in darker pink.

Nozzle (without bottom spacer)

Nozzle (grey)

Current support spacer (light pink)

Nozzle skirt pocket

9 Westinghouse Non-Proprietary Class 3

Alternate Bottom Support Spacer for Skirted Nozzle The alternate bottom support spacer is a rigid aluminum spacer with an essentially solid upper portion to fit within the skirted nozzle pockets. The top rubber is compressed by the nozzle flow plate.

The nozzle legs contact the lower portion of the alternate support spacer with a compression fit.

Nozzle inner portion (purple)

10 Westinghouse Non-Proprietary Class 3

Alternate Bottom Support Spacer Component

Design and Analysis Methodology

- Compression fit using the design method in SAR, Section 1.2.1.5.3, 3/32 gap occupied by 1/8 compression pad between skirted nozzle flow plate and upper support spacer rubber pad.

- Conformal fit ensures load path of fuel assembly and Clamshell directly into impact limiter.

- Benchmark current design physical drop test using Finite Element Analysis (FEA) and determine impact force (g-force) applied to fuel assembly. Obtain impact limiter crush depth and compare to physical test.

- Re-run FEA using alternate bottom support spacer and skirted nozzle, obtain g-force and impact limiter crush distance, and compare to benchmarked FEA [and physical test].

NOTE: There is no impact to the top axial restraint mechanism.

11 Westinghouse Non-Proprietary Class 3

Alternate Bottom Support Spacer Drawing Details

New bottom support spacer design details are added to the Traveller Type B XL & STD drawing 10071E36, along side current bottom support spacer design details

See proprietary slides

12 Westinghouse Non-Proprietary Class 3

Amendment Contents - Rod Pipe Drawing

Upgrades to the Rod Pipe drawing (10006E58) based on existing design

- Rev. 6: additional detail of assembly and detailed views, updated of bill of materials, addition of notes, and new sheet 2 added to show Rod Pipe and Clamshell assembly

- Rev. 7: Change in Section B-8 to identify 4G/6G accelerometers as only trip accelerometers

13 Westinghouse Non-Proprietary Class 3

Amendment Contents - Cladding

Cr-coated cladding and lined cladding (Optimized ZIRLO' liner; OZL); SAR Sections 2.2.1.8 and 3.2.1

- The OZL liner is a zirconium-tin-iron alloy, co-extruded with the Zircalloy base cladding

- Chromium coated is applied to the exterior of the Zircalloy base cladding and may have a 5-35 microns thickness (25 microns nominally)

Evaluations

- Structural properties, total strain energy absorption and melt temperatures compared to and bounded by package HAC tested Zircaloy cladding

- No adverse material interactions determined Optimized ZIRLO is a trademark or registered trademark of Westinghouse Electric Company LLC, its affiliates and/or its subsidiaries in the United States of America and may be registered in other countries throughout the world. All rights reserved. Unauthorized use is strictly prohibited. Other names may be trademarks of their respective owners

14 Westinghouse Non-Proprietary Class 3

Amendment Contents - Cladding BrianEltonHempyFossilDF1

Aluminum A2T1-H cladding and Type 304 Stainless Steel cladding; SAR Section 2.2.1.8 and 3.2.1

- Aluminum A2T1-H cladding is Aluminum-magnesium-chromium alloy that is 96.7% weight percent Aluminum.

- Stainless steel cladding is Type 304 fabricated to SUS304 (Annealed Type 304 Stainless steel).

Evaluations

- Structural properties, total strain energy absorption and melt temperatures compared to and bounded by package HAC tested Zircaloy cladding.

- No adverse material interactions determined.

15 Westinghouse Non-Proprietary Class 3

Cladding Structural Evaluation Method BrianEltonHempyFossilDF1

Total strain energy absorption evaluation method used for previous amendment applications for added cladding types.

Total strain energy absorption is the sum of the elastic plus plastic areas under the stress-strain curve (also referred to as the sum of Resilience plus Toughness).

Ductile metals provide the greatest strain energy absorption capability when compared to more brittle metals.

16 Westinghouse Non-Proprietary Class 3

Cladding Structural Evaluation Method BrianEltonHempyFossilDF1

Current SAR Rev. 1, Table 2.2-5 shown: results to be amended with new cladding material evaluation results and specific values (as in USA/9297/AF-96 SAR Rev. 15)

17 Westinghouse Non-Proprietary Class 3

Amendment Contents - Criticality Summary

ADOPT fuel (Section 6.3.2.2)

- Al2O3 and Cr2O3 mixed with UO2

- Criticality assessment by sensitivity study shows no impact on safety basis case

7wt.% 235U UO2 loose fuel rods (Section 6.2.3)

- All 5wt.% NCT/HAC, single package and package array criticality assessments re-analyzed with 7wt.%

- Added more >5wt.% benchmarks for higher enrichment contents

Cladding: Cr-coating and OZL (Section 6.3.2.4)

- Neglected from the criticality analysis as they will have a negligible effect on the system reactivity through removal of moderation and presence of neutron absorbing materials

- May not be credited in the minimum clad thickness requirement

Loose fuel rod cladding is not modeled in analysis, thus the addition of Al and SS cladding does not impact criticality

New 6 wt.% 235U fuel assembly analysis (Group 4, Section 6.2.3)

Reviewed in proprietary slides

18 Westinghouse Non-Proprietary Class 3

Additional SAR Revisions

Chapter 8, Acceptance Tests And Maintenance Program

- Section 8.1.2, Updated accepted ASME code version for weld examinations of first use package acceptance tests - Section 8.2.3.2, updated wording to weather gasket

- New Section 8.2.6, addresses periodic weld examinations

- New Section 8.2.7, addresses periodic acetate plug examinations

19 Westinghouse Non-Proprietary Class 3

Summary

Amendment application submittal to NRC planned for mid-July 2021

NRC approval will be requested by 31 January 2022

Contents amendment

- New bottom support spacer component for 4-legged skirted bottom nozzles

- Cr-coated cladding and Optimized-ZIRLO liners (OZL)

- Loose Rod cladding: Al and SS

- ADOPT UO2 fuel

- 7% loose fuel rods

- 6% fuel assembly

- Other minor changes Thank you for the early engagement

Westinghouse Non-Proprietary Class 3 20

Questions / Comments Thank you for the early engagement opportunity

ML21183A063

Text

Background:

Navigation menu

Search