ML16342D802
| ML16342D802 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 09/19/1997 |
| From: | Steven Bloom NRC (Affiliation Not Assigned) |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| References | |
| TAC-M97014, TAC-M97915, NUDOCS 9710010006 | |
| Download: ML16342D802 (8) | |
Text
Hr. Gregory H.
Rueger Pacific Cas and Electric Company NPG - Mail Code A10D P. 0.
Box 770000
, San Francisco, Cali fornia 94177 I
September 19, 1997
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - LICENSE AMENDMENT REQUEST 97-11 RELATED TO AUXILIARYSALTWATER SYSTEM PIPING BYPASS UNREVIEWED SAFETY QUESTION (TAC NOS.
H97014 AND H97915)
Dear Mr. Rueger:
By letter dated 'August 26, 1997, Pacific Gas and Electric Company (PG8E) submitted an application tor license amendment (LAR 97-11) related to Auxiliary Saltwater (ASW) Piping Unreviewed Safety Question (USQ).
In.order for the staff to complete its review, we require the additional information listed in the enclosure.
Please provide your response within 30 days from receipt of this letter.
Sincerely, Original Signed By Docket Nos.
50-275 and 50-323
Enclosure:
Request for Additional Information cc w/encl:
See next page Steven D. Bloom, Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation DISTRIBUTION:
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 September 19, 1997 Mr. Gregory H.
Rueger Pacific Gas and Electric Company NPG - Hail Code A10D P. 0.
Box 770000 San Francisco, California 94177
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - LICENSE AMENDMENT REQUEST 97-11 RELATED TO AUXILIARYSALTWATER SYSTEM PIPING BYPASS UNREVIEWED SAFETY QUESTION (TAC NOS.
H97014 AND M97915)
Dear Hr. Rueger:
By letter dated August 26, 1997, Pacific Gas and Electric Comoany (PGIlE) submitted an application for license amendment (LAR 97-11) related to Auxiliary Saltwater (ASW) Piping Unreviewed Safety Question (USQ).
In order for the staff to complete its review, we require the additional information listed in the enclosure.
Please provide your response within 30 days from receipt of this letter.
Sincerely, Docket Nos. 50-275 and 50-323
Enclosure:
Request for Additional Information cc w/encl:
See next page Steven D. Bloom, Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation
l
Mr. Gregory M. Rueger September 19, 1997 cc w/encl:
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 Chai r 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, 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.
Nucleai Regulatory Commission Harris Tower 8 Payi llion 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. Robert P.
Powers Vice President and Plant Manager Diablo Canyon Nuclear Power Plant P. 0.
Box 56 Avila Beach, California 93424 Telegram-Tribune ATTN:
Managing Editor 1321 Johnson Avenue P.O.
Box 112 San Luis Obispo, California 93406
ENCLOSURE RE UEST FOR ADDITIONAL INFORMATION DIABLO CANYON POWER PLANT UNITS 1 AND 2 PACIFIC GAS AND ELECTRIC COMPANY DOCKET NOS. 50-275 AND 50-323 Justify your conclusion that the zone of potential liquefaction is limited in size.
covering an area of about 10 to 20 feet by 100 feet with a thickness of about 5 feet, by providing both longitudinal sections and transverse (cross) sections of the soil profiles in the affected areas of the ASW system bypass piping and indicating all ertinent soil parameters, such as the standard penetration test (SPT) low counts, fines content, etc., of the different soil layers, the elevations of the ASW pipe lines and bedrock.
Also provide a legible and reasonably large size drawing showing the location of the AW system bypass piping and the soil borings.
2.
Provide the detailed calculations along with necessary justifications for any assumptions made in support of your assessment that the upper bound settlements would vary from about 1 inch in the liquefiable zone to about 0.5 inch near the ground surface for a Hosgri or LTSP size earthquake.
3.
Describe and justify the accuracy of the procedure used to convert the blow counts measured by a large sampler to equivalent SPT blow count (N) values.
4 Provide a copy of the report by your consultant.
Harding Lawson Associates (HLA). titled "Geotechnical Slope Stability Evaluation, ASW System Bypass Unit 1. Diablo Canyon Power Plant," dated July 3, 1996.
The staff is interested in the basis for the residual shear strength of the liquefied soil used in the seismic slope stability analysis.
Also provide a detailed summary of Bechtel's Geotechnical Engineering Group's report that verified HLA's slope stability analysis.
4 4
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