ML20288A813
| ML20288A813 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 10/14/2020 |
| From: | NRC |
| To: | NRC/NRR/DNRL |
| References | |
| Download: ML20288A813 (9) | |
Text
From:
Santos, Cayetano Sent:
Wednesday, October 14, 2020 1:28 PM To:
Vogtle PEmails
Subject:
FW: Slides for Weldolet Alternative Discussion on the Public Call Tomorrow Attachments:
VEGP 3&4 Code Alternative for Weldolets - Presentation for Oct 15 Meeting.pdf From: Leighty, Steven <sleighty@southernco.COM>
Sent: Wednesday, October 14, 2020 12:58 PM To: Gleaves, Billy <Bill.Gleaves@nrc.gov>; Santos, Cayetano <Cayetano.Santos@nrc.gov>
Cc: Arafeh, Yasmeen N. <YNARAFEH@southernco.com>
Subject:
[External_Sender] Slides for Weldolet Alternative Discussion on the Public Call Tomorrow Billy/Tanny, We put together a few high level slides to guide the conversation during the call tomorrow on the draft alternative. There is no new information in the slides, just some talking points to help walk through the draft alternative.
- Thanks, Steve Leighty l Southern Nuclear Licensing Supervisor l Vogtle 3&4 706.848.6790 l sleighty@southernco.com
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Subject:
FW: Slides for Weldolet Alternative Discussion on the Public Call Tomorrow Sent Date:
10/14/2020 1:27:34 PM Received Date:
10/14/2020 1:27:37 PM From:
Santos, Cayetano Created By:
Cayetano.Santos@nrc.gov Recipients:
"Vogtle PEmails" <Vogtle.PEmails@nrc.gov>
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BLAPR09MB7313.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 775 10/14/2020 1:27:37 PM VEGP 3&4 Code Alternative for Weldolets - Presentation for Oct 15 Meeting.pdf 374783 Options Priority:
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October 15, 2020 Alternative Request to ASME Section XI Code Examination Requirements for Weldolets Pre-submittal Meeting Plant Vogtle Units 3&4
2 Background
- Challenges have been identified with volumetric Section XI examination requirements for Weldolet ASME Class 1 Branch Connections in the Reactor Coolant System (RCS) Pressure Boundary
- Four applicable weldolets total [two in each Unit (3&4)]
- Located on branch connection lines within Automatic Depressurization System (ADS) Stage 1 piping
3 Background
Item No.*
Description Examination Limitation Component B9.31 Branch Connection Weld Branch Connection Geometry SV3-RCS-PLW-013-SW3 B9.31 Branch Connection Weld Branch Connection Geometry SV3-RCS-PLW-01C-SW3 B9.31 Branch Connection Weld Branch Connection Geometry SV4-RCS-PLW-013-SW3 B9.31 Branch Connection Weld Branch Connection Geometry SV4-RCS-PLW-01C-SW3 Weldolet Branch Connections
- Section XI, Table IWB-2500-1
4 Reason for Request
- NPS >= 4, 100 percent surface and volumetric examinations for branch connection welds (B9.31)
- NPS < 4, Surface examinations only
- Examination Volume not Achievable for Subject Weldolets
- The configurations of the subject Weldolets are widely used by the industry
- Challenges with these configurations are typical, and are frequently captured in relief requests
5 Proposed Alternative
- Best Effort Volumetric Examination
- Conducted to the maximum extent practical
- Minimum examination coverage of 40%
- Surface Examination
- Conducted to the maximum extent practical
- Acceptance Criteria
- In accordance with IWB-3000 for Class 1 systems
6 Additional Information
- Section III Surface Examinations were Performed During Fabrication / Installation
- Testing performed and documented in data packages provided by Stone
& Webster, Inc.
- Liquid Penetrant Examination Method
- Results were acceptable
- Section XI Surface Examinations were Performed After Installation
- Results were acceptable
7 Summary
- 100% Volumetric Section XI Examination Requirements of Subject Weldolets is Not Achievable
- SNC Requests Alternative to ASME Section XI Requirements
- Best effort volumetric examinations
- Surface examinations
- Precedent for Approval in Industry