Minutes of the Advisory Committee on Reactor Safeguards Metallurgy and Reactor Fuels

198 Pages·2017·2.14 MB·English

by  Nguyen, Quynh

UNITED STATES
NUCLEAR REGULATORY COMMISSION
ADVISORY COMMITTEE ON REACTOR SAFEGUARDS
WASHINGTON, DC 20555 - 0001

April 18, 2017

MEMORANDUM TO: ACRS Members

FROM: Christopher L. Brown, Senior Staff Engineer /RA/
Technical Support Branch
Advisory Committee on Reactor Safeguards

SUBJECT: CERTIFICATION OF THE MINUTES OF THE ACRS
METALLURGY AND REACTOR FUELS SUBCOMMITTEE
MEETING ON DECEMBER 15, 2016, IN ROCKVILLE,
MARYLAND

The minutes for the subject meeting were certified on April 2, 2017. Along with the
transcripts and presentation materials, this is the official record of the proceedings of that
meeting. A copy of the certified minutes is attached.

Attachment: As stated

cc with Attachment: A. Veil
M. Banks
UNITED STATES
NUCLEAR REGULATORY COMMISSION
ADVISORY COMMITTEE ON REACTOR SAFEGUARDS
WASHINGTON, DC 20555 - 0001

MEMORANDUM TO: Christopher Brown, Senior Staff Engineer
Technical Support Branch
Advisory Committee on Reactor Safeguards

FROM: Peter Riccardella, Chairman
Metallurgy & Reactor Fuels Subcommittee

SUBJECT: CERTIFICATION OF THE MINUTES OF THE ACRS
METALLURGY AND REACTOR FUELS SUBCOMMITTEE
MEETING ON DECEMBER 15, 2016, IN ROCKVILLE,
MARYLAND

I hereby certify, to the best of my knowledge and belief, that the minutes of the subject
meeting on December 15, 2016, are an accurate record of the proceedings for that meeting.

/RA/ April 2, 2017

Peter Riccardella, Chairman Dated
Metallurgy & Reactor
Fuels Subcommittee
Certified on: April 2, 2017
Certified by: Peter Riccardella
ADVISORY COMMITTEE ON REACTOR SAFEGUARDS
MINUTES OF THE METALLURGY AND REACTOR FUELS SUBCOMMITTEE MEETING
DECEMBER 15, 2016
The ACRS Future Plant Designs Subcommittee held a meeting on December 15, 2016, in
T-2B1, 11545 Rockville Pike, Rockville, Maryland. The meeting convened at 8:31 am and
adjourned at 11:33 am.
The entire meeting was open to the public.
ATTENDEES
ACRS Members/Consultants/Staff
PETER C. RICCARDELLA, Chairman
DENNIS C. BLEY, Member
CHARLES H. BROWN, JR., Member
WALTER L. KIRCHNER, Member
DANA A. POWERS, Member
GORDON R. SKILLMAN, Member
MATTHEW W. SUNSERI, Member
WILLIAM SHACK, ACRS Consultant
DEREK WIDMAYER, ACRS – Designated Federal Official
ROBERT HSU, NRR
TIM LUPOLD, NRO
BRIAN THOMAS, RES
ROB TREGONING, RES
ALEXANDER TSIRIGOTIS, NRO
Other Stakeholders:
ERICA GRAHAM, Public Participant (via phone)
GARY STEVENS, Structural Integrity Associates (via phone)
SUMMARY
The purpose of this meeting is to review and discuss RG 1.207 (DG-1309) and environmentally-
assisted fatigue. The meeting transcripts are attached and contain an accurate description of
each matter discussed during the meeting. The presentation slides and handouts used during
the meeting are attached to these transcripts.
SIGNIFICANT ISSUES
Reference Pages
Issue
in Transcript
Regarding opening questions from Mr. Shack and Member Skillman
about this guide and the regulatory environment, Mr. Tregoning stated
10-20
that an analysis for specific plant configurations would be needed on an
individual basis.
1
Mr. Tregoning begins a discussion describing EAF (environmentally-
20-25
assisted fatigue) as well as FEN, environmental fatigue correction factor.
Member Powers asked if any fundamental modelling was conducted. 25-30
Member Powers asked why ASME eschews water environments. 31-34, 41
Member Brown asked if there was a situation where CUF > 1. This led
to a discussion where inspections and a monitoring program to
34-40
determine crack initiation can be mitigating strategies as CUF is just a
quantitative screening tool.
An explanation of the background and history of this topic. Member Bley
commented that he liked the integrated discussion of comments and 42-56
how things changed in this guide, including a sample problem.
Dissemination of public comments. Three specific areas: 1) extension of
the best fit mean air curve for ferritic steel; 2) feedback on adjustment
factors; and 3) accuracy check of the technical content. (Examples: 57-84
adjustment factors (66; as a function of strain 68) (in general, ASME
method and requirements 70) (high cycle fatigue regime 73)
Environmental effects. Summary of changes in NUREG/CR-6909 were
discussed; i.e., fatigue strain, adjustment factor in ASME fatigue design 84-89
curves and validation of F expressions.
en
Overview of public comments and responses. Four organizations (Rolls
Royce, Westinghouse, AREVA, and EPRI) commented on both
NUREG/CR-6909, Revision 1 and DG-1309. Member Skillman asked a
91-115
question about RG being applicable to both primary and secondary
systems.

Discussion in summary of changes to the RG. For example, the RG
clarifies that Ni-Cr-Fe alloys should use the stainless steel design curves
in air provided in NUREG/CR-6909, Rev. 1 (or associated ASME Code
Section III curves). Further, the RG Clarifies the applicability to existing
116-119
licensing applications that are either required by regulation to have a
CUF or have an existing CUF as part of current licensing basis.

Discussion on current status and next steps. Requesting ACRS
recommendation to finalize RG 1.207. RG 1.207 should be finalized
119-125
before issuance of SLR guidance (i.e., NUREG-2191, NUREG-2192) in
mid-2017.
Public comments 125-130
Member comments 130-133

2
Official Transcript of Proceedings

NUCLEAR REGULATORY COMMISSION

Title: Advisory Committee on Reactor Safeguards
Metallurgy and Reactor Fuels Subcommittee
Morning Session

Docket Number: (n/a)

Location: Rockville, Maryland

Date: Thursday, December 15, 2106

Work Order No.: NRC-2784 Pages 1-134

NEAL R. GROSS AND CO., INC.
Court Reporters and Transcribers
1323 Rhode Island Avenue, N.W.
Washington, D.C. 20005
[phone]
1
UNITED STATES OF AMERICA
NUCLEAR REGULATORY COMMISSION
+ + + + +
ADVISORY COMMITTEE ON REACTOR SAFEGUARDS
(ACRS)
+ + + + +
METALLURGY AND REACTOR FUELS SUBCOMMITTEE
+ + + + +
MORNING SESSION
+ + + + +
THURSDAY
DECEMBER 15, 2016
+ + + + +
ROCKVILLE, MARYLAND
+ + + + +
The Subcommittee met at the Nuclear
Regulatory Commission, Two White Flint North, Room
T2B1, 11545 Rockville Pike, at 8:31 a.m., Peter C.
Riccardella, Chairman, presiding.

COMMITTEE MEMBERS:
PETER C. RICCARDELLA, Chairman
DENNIS C. BLEY, Member
CHARLES H. BROWN, JR., Member
WALTER L. KIRCHNER, Member
NEAL R. GROSS
COURT REPORTERS AND TRANSCRIBERS
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[phone] WASHINGTON, D.C. 20005-3701 [phone]
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DANA A. POWERS, Member
GORDON R. SKILLMAN, Member
MATTHEW W. SUNSERI, Member

ACRS CONSULTANT:
WILLIAM SHACK

DESIGNATED FEDERAL OFFICIAL:
DEREK WIDMAYER

ALSO PRESENT:
ERICA GRAHAM, Public Participant*
ROBERT HSU, NRR
TIM LUPOLD, NRO
GARY STEVENS, Structural Integrity Associates*
BRIAN THOMAS, RES
ROB TREGONING, RES
ALEXANDER TSIRIGOTIS, NRO
ANDREA D. VEIL, Executive Director, ACRS

*Present via telephone

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C-O-N-T-E-N-T-S
PAGE
Dr. Peter Riccardella, ACRS - Opening Remarks and
Objectives . . . . . . . . . . . . . . . . . . . . 4
Staff Opening Remarks . . . . . . . . . . . . . . 6
Rob Tregoning - Background EAF, Current NRC Guidance
on EAF and Associated Technical Guidance and Proposed
Revision to NRG Guidance and Associated Technical
Guidance . . . . . . . . . . . . . . . 9
Summary of Public Comments, Responses and Changes to
NUREG/CR-6909 Rev. 1 . . . . . . . . . . . . . . 42
Current status and next steps....................121
Public comments..................................126
Adjourn..........................................134

NEAL R. GROSS
COURT REPORTERS AND TRANSCRIBERS
1323 RHODE ISLAND AVE., N.W.
[phone] WASHINGTON, D.C. 20005-3701 [phone]
4
1 P R O C E E D I N G S
2 8:31 a.m.
3 CHAIRMAN RICCARDELLA: Let's get started.
4 The meeting will come to order. This is a meeting of
5 the Metallurgy and Reactor Fuels Subcommittee. I'm
6 Pete Riccardella, member of the subcommittee and I'll
7 be chairing this meeting. ACRS members in attendance
8 are Charles Brown, Jose March-Leuba, Dennis Bley, Matt
9 Sunseri, Dana Powers, Gordon Skillman and our
10 consultant, William Shack.
11 Christopher, no Derek Wedmayer will be the
12 designated federal official for this meeting. The
13 purpose of this meeting is to receive a briefing on Reg
14 Guide 1.207 Guidelines for Evaluating the Effects of
15 Light-Water Reactor Environments in Fatigue Analyses
16 of Metal Components. The Reg Guide was issued for
17 public comment as Draft Reg Guide DG-1309. We'll hear
18 presentation from representatives of the Office of
19 Nuclear Regulatory Research, the subcommittee will
20 gather information, analyze relevant issues and facts
21 and form a composed position in action as appropriate
22 for deliberation by the full committee. The rules for
23 participation in today's meeting were announced as part
24 of the notice of the meeting, previously post in the
25 Federal Register on December 13th, 2016. We've
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1 received no written comments or requests for time to
2 make oral statements for members of the public.
3 A transcript of the meeting is being kept
4 and will be made available as stated in the Federal
5 Register Notice; therefore we request that
6 participants in this meeting use the microphones
7 located throughout the meeting room when addressing the
8 subcommittee. Participants should first identify
9 themselves and speak with sufficient clarity and volume
10 so that they can be really heard. Please silence all
11 phones.
12 We have one bridgeline established for
13 interested members of the public to listen in. The
14 bridge number of password were published in the agenda
15 posted on the NRC public website. To minimize
16 disturbance the public line will be kept in a listen-in
17 mode only, the public will have the opportunity to make
18 statement or provide comments as designated time toward
19 the end of the meeting. Our last meeting with the staff
20 was on December 14th, 2014 in which Gary Stevens
21 discussed the background information, reason for
22 revising the Reg Guide and revisions to the FEN
23 equations. We understand that you have addressed
24 public comments and are ready to issue the Reg Guide.
25 The full committee is scheduled to hear this matter on
NEAL R. GROSS
COURT REPORTERS AND TRANSCRIBERS
1323 RHODE ISLAND AVE., N.W.
[phone] WASHINGTON, D.C. 20005-3701 [phone]