ML16342D188
| ML16342D188 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 01/22/1996 |
| From: | Steven Bloom NRC (Affiliation Not Assigned) |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| References | |
| TAC-M93935, TAC-M93936, NUDOCS 9601260044 | |
| Download: ML16342D188 (8) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2055&4001 January 22, 1996 5O-zan Hr. Gregory H. Rueger Pacific Gas and Electric Company NPG Hail Code AlOD P. 0. Box 770000 San Francisco, California 94177
SUBJECT:
REQUEST FOR DEVIATION FROM CERTAIN TECHNICAL REQUIREMENTS OF APPENDIX R TO 10 CFR PART 50 FOR DIABLO CANYON NUCLEAR POWER PLANT, UNIT NO.
1 (TAC NO. H93935)
AND UNIT NO.
2 (TAC NO. H93936)
Dear Hr. Rueger:
By letter dated September 28, 1995, Pacific Gas and Electric (PG&E), the licensee for Diablo Canyon Power Plant, Units 1 and 2
(DCPP),
requested a
deviation from the technical requirements of Section III.G.2.b of Appendix R
to Part 50 of Title 10 of the Code of Federal Re ulations (10 CFR Part 50) to the extent that it requires the separation of redundant trains of safe shutdown cables and equipment by a horizontal distance of more than 20 feet with no intervening combustibles or fire hazards.
In addition, fire detectors and an automatic fire suppression system shall be installed in the fire area.
Specifically, you requested a deviation from the automatic suppression and detection technical provisions of Section III.G.2.b of Appendix R, to the extent that area wide automatic detection and suppression is not provided in the intake str ucture (Fire Area IS-1/Fire Zone 30-A-) for DCPP Units 1 and 2.
The NRC staff has reviewed this deviation, against the guidance by Interpretation 5, "Automatic Detection and Suppression,"
of Generic Letter (GL) 86-10, "Implementation of Fire Protection Requirement," April 24, 1986.
This interpretation states,
.In order to comply with the above provision, detection and suppression sufficient to protect against the hazards of the area must be installed.
In this regard, detection and suppression providing less than full area coverage may be adequate to comply with this requirement.
Where full area detection and suppression is not installed, licensees must perform an evaluation to access the adequacy of partial suppression and detection against the hazards in the area."
During an inspection at the Diablo Canyon Nuclear Power Plant, Unit Nos.
1 and 2, November 13-17, 1995, the NRC staff followed up and reviewed the requested deviation.
The proposed deviation request consisted of auxiliary saltwater (ASW) circuits which are located in the common intake structure for DCPP Units 1 and 2.
The intake structure houses four circulating water pumps (CWPs) and four ASW pumps.
The NRC staff found that the redundant circuits for the ASW pumps are separated by a horizontal distance of 20 feet with no 9601260044 960i22 PDR ADOCK 05000275 P
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tE Mr. Gregory M. Rueger Steven D. Bloom; Project Manager Project Direct'orate;,'IV-2 Division ',of Reactor, Projects III/IV Office of Nuclear Reactor Regulation t<
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'an'd, par'tial 'smoke 'detection, and suppression is provided between redundant ASW pumps a'nd:,the exhaustI fan cir'cuits...The NRC has determined that you have provided adequate.,detection and suppr'essio'n between the redundant trains.
Therefore',<'based orI its', review,'the NRC'taff has determined that the deviation requested by ".you is 'not-'requir'ed..
-Sincerely,-
l.
',,Original s,i;gn1ed by:
Docket Nos.
50-275 and 50-323 cc:
See next page DISTRIBUTION Docket. File PUBLIC PDIV-2 Reading JRoe EAdensam WBateman SBloom EPeyton ACRS OGC, 015BIS
- KPerkins, WCFO
- JDyer, RIV SWest DOCUMENT NAME:
DC93935.LTR OFC PDIV-2 LA NAME EPe tpen DATE 1 Lt96 PD V-2 PM m.ye 1Z.
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Mr. Gregory H. Rueger intervening combustible materials and partial smoke detection and suppression is provided between redundant ASW pumps and the exhaust fan circuits.
The NRC has determined that you have provided adequate detection and suppression between the redundant trains.
Therefore, based on its review, the NRC staff has determined that the deviation requested by you is not required.
Sincerely, Docket Nos. 50-275 and 50-323 cc:
See next page Original signed by:
Steven D. Bloom, Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation O~BTRIBOTIO Docket File PUBLIC PDIV-2 Reading JRoe EAdensam WBateman SBloom EPeyton ACRS
- OGC, 015B18
- KPerkins, WCFO
- JDyer, RIV SWest DOCUMENT NAME:
DC93935. LTR OFC NAME DATE PDIV-2 LA PD V-2 PM Epe tpen m.
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4 Mr. Gregory M. Rueger 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, California 95814 Ms. Nancy Culver San Luis Obispo Mothers for Peace P. 0.
Box 164 Pismo Beach, California 93448 Ms. Jacquelyn C. Wheeler P. 0.
Box 164 Pismo Beach, California 93448 Managing Editor The Count Tele ram Tribune 1321 Johnson Avenue P. 0.
Box 112 San Luis Obispo, California 93406 C
Chairman San Luis Obispo County Board of Supervisors Room 370 County Government Center San Luis Obispo, California 93408 Mr. Truman Burns Mr. Robert Kinosian California Public Utilities Commission 505 Van Ness, Room 4102 San Francisco,'alifornia 94102 Mr. Steve Hsu Radiologic Health Branch State Department of Health Services Post Office Box 942732 Sacramento, California 94232 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower
& Pavillion 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. Warren H. Fujimoto Vice President and Plant Manager Diablo Canyon Nuclear Power Plant P. 0.
Box 56 Avila Beach, California 93424 Diablo Canyon Independent Safety Committee ATTN:
Robert R. Wellington, Esq.
Legal Counsel 857 Cass Street, Suite D
Monterey, California 93940
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