ML20235Y317

Provides Info on Attendees & Tentative Schedule of Plant Subcommittee Meeting Re Discussion of NRC Diablo Canyon Peer Review Group Rept.I Yin Will Respond to Rept,Which Concerns Small & Large Bore Piping,Supports & QA

ML20235Y317
Person / Time
Site:	Diablo Canyon
Issue date:	07/10/1984
From:	Mckinley J Advisory Committee on Reactor Safeguards
To:	Seiss C, Siess C Advisory Committee on Reactor Safeguards
Shared Package
ML20235X756	List: IA-84-743, Lists Addl Actions to Be Taken to Assure Continuity in Review & Resolution of Allegations Re Design of Small Bore Piping IA-84-776, Summarizes Aslab 840906 Decision Affirming Board 820831 Initial Decision Authorizing Full Power License for Unit 1. Board 840910 Order Requests Parties Views for Further Action on Unit 2 & 840906 Order Denies Reopening Seismic Issues ML20235X753 ML20235X841 ML20235Y060 ML20235Y182 ML20235Y317 ML20235Y692 ML20244C838 ML20244D054
References
FOIA-84-743, FOIA-84-744, FOIA-84-776 ACRS-GENERAL, NUDOCS 8710200305
Download: ML20235Y317 (1)

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UNITED STATES S g; i I*M 4

7't NUCE. EAR REGULATORY COMMISSION l- Ghw#

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$, 3 ,E ADVISORY COMMITTEE ON REACTOR SAFEGUARDS '

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• • • • • 7, MEMORANDUM FOR: C. P. Siess, Chairman , j W yLb . 74),f, Di blo Can on N clear Power Plant FROM: y. .

KinleyMChief Project Review Branch #1

SUBJECT:

DIABLO CANYON SUBCOMMITTEE MEETING, JULY 11, 1984 STATUS REPORT The A.CRS has been requested by the NRC Staff to review the draft " Report of the Diablo Canyon Peer Review Group"* and to prepare a report to the Commissioners. The report is limited to small and large bore piping, its supports and its quality assurance. As you may recall, Mr. Isa Yin has been concerned regarding the design quality which has resulted in J additional supports being installed and the existing supports not being modified or removed as appropriate. The NRC established a Peer Review Group to consider Mr. Yin's concerns; the conclusion of this Group j been satisfactorily addressed, the past staff conclusions on the IDVP ) a3 remain valid, and the programmatic issues raised concerning onsi g g[g,,.y I engineering have been resolved. @

I anticipate this meeting will primarily be a discussion between the vd. pI .

Subcommittee and the NRC Staff. Representatives of the Licensee will be present to respond to questions. 6"h l Attendance by the following is anticipated:

Dr. Siess Mr. Michelson Mr. Ebersole Mr. Bender, Consultant .

Mr. Etherington Mr. Mysinger, Consultant Dr. Lewis The tentative schedule is:

8:30 a.m OpeningStatement(Dr.Siess) l 8:45 a.m. NRC Staff Summary of "Diablo Canyon Peer Review Group" report (R. Vollmer, NRR) [.

9:30a.m. Concurrence / nonconcurrence of Mr. Isa Yin (I. Yin I&E) l 10:00 a.m. General Discussion 12:30 p.m. Lunch g x 1:30 p.m. Resume Discussion

\ 5:00 p.m. Adjourn 1 Copies sent by special mail on July 6, 1984 to all

' Subcommittee members and consultants f

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Congress of tfjt Unitch 6tates 1 hou%t Dt Etpitstntatibt% .

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-- 55astington,3B.C. 20515.'

a July 30, 1984 1 1

4 ll Honorable Nunzio Palladino Chairman z Nuclear Regulatory-Commission j j

, ~1717 "H" Street, N.W.-

Washington, D.C. 20555 ,i 1

Dear Mr. Chairman:

Thank you for your assistance in making Isa Yin of.theNRC Region i III staff available for a briefing on the Diablo Canyon nuclear 1 facility on July 25. We sincerely appreciate.your help in complying  ;

with Congressional requests of this kind, and hope this spirit of- j 1

cooperation will continue, a We initially requested the briefing with Mr. Yin out of concern about his- resignation from and lack of confidence in the. investigation. i conducted by the NRC Peer Review Group (PRG) into the design control -l and quality assurance issues raised by Mr. Yin 'before the Commission j on March 26. As you know, the PRG was organized to review and I

evaluate the Diablo licensee's compliance with seven License Con- 1 ditions attached to the low power test Operation License issued by i the Commission on April 13. ~j

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At the July 25 briefing Mr. Yin outlined his concerns about the.  ;

inadequate scope and improper documentation of the PRG's' efforts, and 1 conveyed his belief that additional measures were necessary to ensure:

compliance with the seven License Conditions. Specifically, Mr. Yin .;

discussed: 1).the necessity of properly documenting and performing i additional analysis of 'small bore pip ng support computer calculations, .l

2) the need to more closely analyze t e spacing and shimming of ,

closely-spaced rigid support structures , 3) the importance, of' examining j design assumptions relative to the placement of snubbers elose to rigid restraints, and 4) the need to perform additional theoretical-  ;

and on-site analysis of potential main stem pipe contact with y structural and electrical interference objects, i

Mr. Yin 'also detailed .his continuing concerns about - the imprcper .use.

of " quick fix" design changes at Diablo and possible' inadequacies in

'the Independent Design Verification Program. He believes these prob 2ams point :to a substantial quality assurance breakdown in-the-areas.of small and large bore piping design control. Mr. Yin.also  :

discussed.his findings of inadequate personnel training and'the improper control of critical documents relative to the On-Site Project Engineering Group q n.,

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