ML16342A535
| ML16342A535 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 10/15/1998 |
| From: | Steven Bloom NRC (Affiliation Not Assigned) |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| Shared Package | |
| ML16342A536 | List: |
| References | |
| TAC-M98939, TAC-M98940, NUDOCS 9810190224 | |
| Download: ML16342A535 (4) | |
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October 15, 1998 Mr. Gregory M. Rueger Senior Vice President and General Manager Pacific Gas and Electric Company Diablo Canyon Nuclear Power Plant P. O. Box 3 Avila Beach, California 93424
SUBJECT:
SAFETY EVALUATIONOF THE ASSESSMENT OF SLOPE STABILITYNEAR DIABLOCANYON POWER PLANT (TAC NOS. M98939 AND M98940)
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Dear Mr. Rueger:
The NRC has reviewed Pacific Gas and Electric Company's (PG&E) letter dated April 28, 1997, that responded to the staffs request for information about the landslide potential at Diablo Canyon Power Plant (DCPP). The information request was made after PG8E declared an Unusual Event due to a mud slide on the county road leading to the plant entrance at DCPP.
I Based on its detailed investigations related to the landslide potential at Diablo Canyon Power Plant, PG8 E has concluded, and the staff agrees, that earthquake loading following periods of prolonged rainfall will not produce any significant slope failure that can adversely affect the Category I structures including the intake and discharge structures at the site.
In addition, PG&E has concluded that potential slope failures under such conditions willnot adversely impact other important facilities such as the raw water reservoirs and the 230-kV and 500-kV switchyards.
A close review of PG&E's submittal indicates that PG8 E has assembled a
significant amount of data related to the previous landslides and soil properties, and has also performed additional analytical studies of the slope stability issue.
Therefore, the staff concurs with PG8 E's conclusions described above.
Our evaluation of PG&E's assessment of the slope stability problem at DCPP site is enclosed.
Sincerely, Original Signed By Steven D. Bloom, Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323
Enclosure:
Safety Evaluation ccw/encl:
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Mr. Gregory M. Rueger October 15, 1998 cc w/encl:
NRC Resident Inspector Diablo Canyon Nuclear Power Plant do 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 Ms. Nancy Culver San Luis Obispo Mothers for Peace P. O. 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 California Public Utilities Commission 505 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 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 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 ATTN: Managing Editor 1321 Johnson Avenue P.O. Box 112 San Luis Obispo, California 93406
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