ML16342A004
| ML16342A004 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 03/02/1993 |
| From: | Peterson S Office of Nuclear Reactor Regulation |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| Shared Package | |
| ML16342A005 | List: |
| References | |
| TAC-M83283, TAC-M83284, NUDOCS 9303050141 | |
| Download: ML16342A004 (6) | |
Text
March 2, 1993 Docket Nos.
50-275 and 50-323 Hr. Gregory H. Rueger Nuclear Power Generation, B14A Pacific Gas and Electric Company 77 Beale Street, Room 1451 P.O.
Box 770000 San Francisco, California 94177
Dear Hr. Rueger:
SUBJECT:
LEAK-BEFORE-BREAK EVALUATION OF REACTOR COOLANT SYSTEM PIPING FOR DIABLO CANYON NUCLEAR POWER PLANT, UNIT NO.
1 (TAC NO. H83283)
AND UNIT NO.
2 (TAC NO. H83284)
On March 16, 1992, Pacific Gas and Electric Company requested to eliminate from the design basis the dynamic effects of postulated pipe ruptures in, the reactor coolant loop piping for Diablo Canyon Power Plant, Units 1 and 2.
The request was based on a plant-specific leak-before-break (LBB) analysis as permitted by General Design Criteria 4 (GDC-4) of Appendix A to 10 CFR 50.
Based on our review, we have determined that your LBB analysis of the reactor coolant system piping complies with GDC-4.
In our safety evaluation, which is
- enclosed, we conclude that the probability of large pipe breaks occurring in the reactor coolant system piping is sufficiently low that dynamic effects associated with postulated pipe breaks need not be a design basis.
This completes the staff effort on this issue and closes TAC Nos.
H83283 and H83284.
If you have any questions regarding this issue, please contact me.
Sincerely, Original signed by Sheri R. Peter son, Project Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc w/enclosure:
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON. D.C. 205554001 Harch 2, 1993 Docket Nos.
50-275 and 50-323 Hr. Gregory H. Rueger Nuclear Power Generation, B14A Pacific Gas and Electric Company 77 Beale Street, Room 1451 P.O.
Box 770000 San Francisco, California 94177
Dear Hr. Rueger:
SUBJECT:
LEAK-BEFORE-BREAK EVALUATION OF REACTOR COOLANT SYSTEH PIPING FOR DIABLO CANYON NUCLEAR POMER PLANT, UNIT NO.
1 (TAC NO. H83283)
AND UNIT NO.
2 (TAC NO. H83284)
On Harch 16, 1992, Pacific Gas and Electric Company requested to eliminate from the design basis the dynamic effects of postulated pipe ruptures in the reactor coolant loop piping for Diablo Canyon Power Plant, Units 1
and 2.
The request was based on a plant-specific leak-before-break (LBB) analysis as permitted by General Design Criteria 4
(GDC-4) of Appendix A to 10 CFR 50.
Based on our review, we have determined that your LBB analysis of the reactor coolant system piping complies with GDC-4.
In our safety evaluation, which is
- enclosed, we conclude that the probability of large pipe breaks occurring in the reactor coolant system piping is sufficiently low that dynamic effects associated with postulated pipe breaks need not be a design basis.
This completes the staff effort on this issue and closes TAC Nos.
H83283 and H83284.
If you have any questions regarding this issue, please contact me.
Sincerely,
Enclosure:
Safety Evaluation cc w/enclosure:
See next page Sheri R. Peterson, project Hanager project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation
Hr. Gregory M. Rueger Pacific Gas and Electric Company Diablo Canyon 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 6715 Rocky Canyon
- Creston, California 93432 Ms. Nancy Culver San Luis Obispo Hothers for Peace P. 0.
Box 164 Pismo Beach, California 93448 Ms. Jacquelyn C. Wheeler 3303 Barranca Court San Luis Obispo, California 93401 Managing Editor The County Telegram Tribune 1321 Johnson Avenue P. 0.
Box 112 San Luis Obispo, California 93406 Chairman San Luis Obispo County Board of Supervisors Room 370 County Government Center San Luis Obispo, California 93408 Mr. Truman Burns Hr. Robert Kinosian California Public Utilities Commission 505 Van Ness, Rm.
4102 San Francisco, California 94102 Hr. Hank Kocol Radiologic Health Branch State Department of Health Services Post Office Box 942732 Sacramento, California 94234 Regional Administrator, Region V
U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Hr. Peter H. Kaufman Deputy Attorney General State of California 110 West A Street, Suite 700 San Diego, California 92101 Michael H. Strumwasser, Esq.
Special Assistant Attorney General State of California Department of Justice 3580 Wilshire Boulevard, Room 800 Los Angeles, California 90010 Christopher J. Warner, Esq.
Pacific Gas h Electric Company Post Office Box 7442 San Francisco, California 94120 Diablo Canyon Independent Safety Committee ATTN:
Robert R. Wellington, Esq.
Legal Counsel 857 Cass Street, Suite D
Monterey, California 93940
4,