ML16342D901
| ML16342D901 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 12/03/1997 |
| From: | Adensam E NRC (Affiliation Not Assigned) |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| References | |
| TAC-M97914, TAC-M97915, NUDOCS 9712120381 | |
| Download: ML16342D901 (6) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 December 3,
1997 Hr. Gregory H. Rueger.
Senior Vice President and General Hanager Pacific Gas and Electric Company Nuclear Power Generation N9B P. 0.
Box 770000 San Francisco.
California 94177
SUBJECT:
AUXILIARYSALTWATER SYSTEH PIPING BYPASS HODIFICATION (TAC NOS.
H97914 AND H97915)
Dear Hr. Rueger:
The Commission's regulations, specifically, 10 CFR 50.59, authorize licensees to make changes in the facility as described in the safety analysis report, without prior approval, unless the proposed change involves a change in the technical specifications incorporated in the license or an unreviewed safety question.
By letter dated January 27, 1997.
you informed the NRC of your intention to initiate an auxiliary saltwater (ASW) piping bypass project due to a concern that localized corrosion was occurring in the portion of the piping buried below sea level in the tidal zone outside the intake structure.
You performed a 10 CFR 50.59 review and determined that this project did not involve an unreviewed safety question.
You provided a copy of your 50.59 evaluation in the January 27, 1997 letter.
Due to the complexity of the modification, a
meeting was held on March 25.
1997.
and a request for additional information was sent to you on April 4, 1997.
By letter dated Hay 15, 1997, you responded to the request for additional information.
It is solely the licensees'esponsibility to make determinations as to whether a change to their facilities would involve an unreviewed safety
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uestion.
This letter is not intended to relieve you of that responsibility.
evertheless, because of'he=staff's interest in the ASW piping bypass project at Diablo Canyon, the staff reviewed the technical basis for your conclusions provided in your January 27.
1997. letter and the information provided during the meeting held on Harch 25.
- 1997, and the responses given on Hay 15, 1997.
During a telephone conversation held on August 13.
1997. the NRC informed your staff that it was the staff's position that an unreviewed safety question existed.
The Diablo Canyon Final Safety Analysis Report (FSAR) classifies the ASW system as Seismic Category I.
The FSAR does not indicate any provssion for the siting of Seismic Category I structures.
- systems, or components (SSC) on liquefiable materials.
In fact. according to the FSAR.'all Category I SSC are found on rock or on concrete fill: Also. the FSAR describes the ASW piping as being anchored in concrete to the circulating water conduits at 40-foot intervals.
The analysis ot the ASW piping route performed by your consultant.
Harding Lawson Associates.
indicates a high probability of liqu'efaction of material under the ASW pipeline over a portion of the bypass route.
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Mr. Gregory M. Rueger December 3,
1997 In your 10 CFR 50.59 safety evaluation, you stated that the possibility of an accident of a different type than already evaluated in the FSAR is not created.
The NRC does not agree with this statement, in that due to the
'piping being sited over liquefiable soil, there is a possibility for an accident or. malfunction of a different type other than any previously
. 'evaluated in the FSAR.
The" staff considers this issue to be an unreviewed safety question requiring
. 'a license amendment.
PGICE submitted a license amendment request dated A'ugust'6, 1997, that is currently under statf review.
This matter will
- undergo consideration for enforcement by Region IV. If you have any questions
" please contact Steve Bloom at (301) 415-1313.
Sincerely, Original Signed By Elinor Adensam, Acting Director Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket Nos.
50-275 and 50-323 cc:
See next page DISTRIBUTION:
%Docket Fi 1.e3 PUBLIC PDIV-2 Reading E.
Adensam (EGAl)
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Bloom E.
Peyton ACRS
- OGC, 015B18 K. Perkins, RIV/WCFO P.
- Gwynn, RIV G. Bagchi.
ECGB R.
- Rothman, ECGB DOCUMENT NAME:
DC97914.LTR
- See Previous Concurrence Sheet OFC PDIV-2/PM PDIV-2/LA NRR:ECGB*
PDIV-2/D OGC*
NAME SBlo; e
DATE 12/
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Mr. Gregory M. Rueger December 3,
1997 CC:
NRC Resident Inspector Diablo Canyon Nuclear Power Plant c/o U.S. Nuclear Regulatory Commission P. 0.
Box 369 Avila Beach. California 93424
~ Dr. Richard Ferguson, Energy Chair Sierra Club California 1100 11th Street, Suite 311 Sacramento.
Cali forni a 95814 Ms.
Nancy Culver San Luis Obispo Mothers for Peace P. 0.
Box 164 Pismo Beach, California 93448 Chairman San Luis Obispo County Board of Supervisors Room 370 County Government Center San Luis Obispo, California 93408 Mr. Truman Burns Mr. Robert Kinosian
'alifornia Public..Utilities Commission 505 Van Ness.
Room 4102 San Francisco.
Cali fornia 94102 Mr. Steve Hsu Radiologic Health Branch State Department of Health Services Post Office Box 942732 Sacramento.
California 94232 Diablo Canyon Independent Safety Committee ATTN:
Robert R. Wellington. Esq.
Legal Counsel 857 Cass Street, Suite D
Monterey. California 93940 Regional Administrator
. Region IV U.S. Nuclear Regulatory Commission Harris Tower & Payillion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Christopher J.
Warner.
Esq.
Pacific Gas
& Electric Company Post Office Box 7442 San Francisco, California 94120 Mr. Robert'.
Powers Vice President and Plant Manager Diablo Canyon Nuclear Power Plant P. 0.
Box 56 Avila Beach. California 93424 Telegram-Tribune ATIN:
Managing Editor 1321 Johnson Avenue P.O.
Box 112 San Luis Obispo, California 93406
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