ML16342A589
| ML16342A589 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 11/30/1998 |
| From: | Steven Bloom NRC (Affiliation Not Assigned) |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| References | |
| TAC-MA3573, TAC-MA3574, NUDOCS 9812020297 | |
| Download: ML16342A589 (6) | |
Text
November 30, 199 Mr. Gregory M. Rueger Senior Vice President and General Manager Pacific Gas and Electric Company Nuclear Power Generation Diablo Canyon Nuclear Power Plant P. O. Box3 Avila Beach, California 93424
SUBJECT:
REQUEST FOR ADDITIONALINFORMATION-LAR 98 REVISION OF RCS PRESSURE/TEMPERATURE LIMITS - DIABLOCANYON POWER PLANT UNITS 1 AND 2 (TAC NOS. MA3573 AND MA3574)
Dear Mr. Rueger:
In a letter dated September 3, 1998, Pacific Gas and Electric Company (PGE), the licensee for Diablo Canyon Units 1 and 2, submitted its license amendment request (LAR) 98-06, "Revision of Technical Specification 3.4.9.1, Figures 3.4-2 and 3.4 RCS Pressure/Temperature Limits and Request for Exemption from 10 CFR 50.60." The NRC staff has reviewed your LARand has identified the need to request additional information in order to determine the acceptability of your request.
The enclosure describes the specific information requested by the staff.
This request was discussed with Mr. Pat Nugent of your staff on November 13, 1998. A mutually agreeable target date of December 21, 1998, for your response was established.
If circumstances result in the need to revise the target date, please call me at the earliest opportunity.
Ifyou have any questions regarding this matter, please contact me at (301) 415-1313.
Sincerely, Original Signed By Steven D. Bloom, Project Manager Project Directorate IV-2 Division of Reactor Projects 111/IV Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323
Enclosure:
Request for Additional Information ccw/encl: See next page DOCUMENT NAME: DCA3573.RAI
~ Docket File PUBLIC PDIV-2 Reading EAdensam WBate man S Bloom EPeyton OGC ACRS GPick, RIV PGwynn, RIV CLiang TCollins OFC PDIV-2/PM PDIV-2/LA NAME DATE SBlo 11/
98
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1 tGPV98 OFFICIAL RECORD COPY 98i2020297 98ii30 PDR ADQCK 05000275 PDR
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Mr. Gregory M. Rueger November 30, 1998 cc w/encl:
NRC Resident Inspector Diablo Canyon Nuclear Power Plant clo U.S. Nuclear Regulatory Commission P. O. Box 369 Avila Beach, California 93424 Dr. Richard Ferguson, Energy Chair Sierra Club California 1100 11th Street, Suite 311 Sacramento, California 95814 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower 8 Pavillion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Christopher J. Warner, Esq.
Pacific Gas 8 Electric Company
~ Post Office Box 7442 San Francisco, California 94120 Ms. Nancy Culver San Luis Obispo Mothers for Peace P. O. Box 164 Pismo Beach, California 93448 I'hairman San Luis Obispo County Board of Supervisors Room 370 County Government Center San Luis Obispo, California 93408 Mr. David H. Oatley, Vice President Diablo Canyon Operations and Plant Manager Diablo Canyon Nuclear Power Plant P.O. Box 3 Avila Beach, California 93424 Telegram-Tribune ANN: Managing Editor 1321 Johnson Avenue P.O. Box 112 San Luis Obispo, California 93406 Mr. Truman Burns Mr. Robert Kinosian California Public Utilities Commission
'05 Van Ness, Room 4102 San Francisco, California 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
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ND JI Provide the Appendix G P/T limits applicable for the first 16 EFPY at Diablo Canyon Power Plant, Units 1 and 2 for the design of the proposed,PTQP system (i.e., P/T limits under steady state reactor operation, the isothermal curve/bin
., ~n ~
Pla.'li itic 2.
Provide a tabulation to list PORV setpoint (435 psig); number.pf operating RCPs, transient pressure overshoot, instrumentation uncertainties, and P/T limits (110 percent of Appendix G limits). These data should show that the value qf,the PORV setpoint plus transient pressure increase plus instrumentation uncertainties is still below the P/T limitwith sufficient margin for the entire temperature range of protectipn.
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Discuss the major assumptions used in your massladdition and energy addition transients supporting your design of the LTOP. Provide the ~suits of an analyses for the energy addition transient to verify that the mass addition tpnsient is tPe limiting transient for the design of the LTOP system.
4.
Please identify the assumptions used in the LTOP analysis that are supported by the restrictions specified in Diablo Canyon TS.
5.
Discuss the standard used for determining the instrumentation uncertainties (pressure and
'emperature) applied in the design of LTOP setp6ints relative to the methodology described in WCAP-14040.
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