ML16342D591
| ML16342D591 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 04/04/1997 |
| From: | Steven Bloom NRC (Affiliation Not Assigned) |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| References | |
| TAC-M97914, TAC-M97915, NUDOCS 9704140127 | |
| Download: ML16342D591 (8) | |
Text
April 4, 1997 Hr. Gregory H. Rueger i ",cific Gas and Electric Company NPG - Mail Code AlOD P.
O.
Box 770000 San Francisco, California 94177
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION' AUXILARY SALTWATER SYSTEM PIPING BYPASS PROJECT DIABLO CANYON, 'UNITS 1
AND 2 (TAC NOS.,
H97914 AND M97915)
Dear Hr. Rueger:
On January 27, 1997, Pacific Gas and Electric Company (PG8E) submitted information about the auxiliary saltwater (ASW) system piping bypass project.
The NRC staff is reviewing and evaluating the submittal.
Additional information, as discussed in the enclosure, is requested in order for the staff to complete its review.
We request that you respond within 60 days after receipt of this letter.
Sincerely, Docket Nos.
50-275 and 50-323 Ericlosure:
Request for Additional Information cc w/encl:
See next page Original Signed By Steven D. Bloom, Project Manager Project Directorate IV-2 Division of Reactor Proj'ects III/IV Office of Nuclear Reactor Regulation DISTRIBUTIONDocket Filets PUBLIC PDIV-2 Reading JRoe EAdensam WBateman SBloom ACRS OGC AHowell, RIV
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.MHartzman TCerovski DOCUMENT NAME:
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4>97 OFF I IAL RECORD COPY
'704i40i27 970404 PDR ADQCK 05000275 P
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Mr. Gregory M. Rueger April 4, 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 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 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. Mellington, 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. Marner, Esq.
Pacific Gas 5 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:
Maqaging Editor 1321 Johnson Avenue P.O.
Box 112 San Luis Obispo, California 93406
P
ENCLOSURE RE UEST FOR ADDITIONAL INFORMATION UXILIARY SALTWATER SYS EH IPING BYPASS PROJECT IABLO CANYON OWER PLANT UNITS 1
AND 2 ACIFIC GAS AND LECTR C
COMPANY DOCKE
- NOS, 50-275 ND 50-323 The following additional information is requested to assist the staff in its review of the PGKE submittal of January 27, 1997.
1.
Provide the abnormal load combinations and the acceptance criteria for the buried piping.
2.
Provide the acceptance criteria for the buried piping flanged joints, and the detailed basis for determining these criteria (ASME Section III,
- 1989, ND 3658.1, using Appendix XI methods modified to be consistent with the characteristics of the buried piping flange and gasket construction).
3.
4, Provide the manufacturer recommended capacities under normal operating conditions for the Dresser couplings.
Indicate the maximum safe rotation at the couplings, and provide the basis for this value.
5.
a.
Provide a description of the method of seismic analysis of the buried piping.
b.
Provide an isometric drawing of the buried piping system computer model showing all supports and locations for ground motion differential displacement-1nput.
c.. Provide the ground motion differential displacement input histories to the analysis.
E 6.
Provide the basis for separating the buried piping system evaluation into an analysis for lateral effects and an analysis for axial effects.
7.
Provide the stresses and strains in the piping under abnormal load conditions at the locations of the couplings before installation.
8.
9.
Provide the displacements and rotations under abnormal load combinations at the locations of the couplings.
Show that the integrity of the pressure boundary at the location of the couplings will be maintained under the imposed lateral displacements and rotations.
I r;
P
~
~
Indicate inspection provisions to verify non-leakage through the couplings during normal operation.
Provide the basis for excluding auxiliary saltwater system (ASW) operating modes with a short duration from the abnormal load combination.
The seismic analysis of the ASW bypass was based on the Diablo Canyon long term seismic program (LTSP) ground motion which has a peak ground acceleration of 0.83g.
Since the LTSP ground motion was developed for a rock site, justify, its use for the ASW bypass which is founded on soil that might amplify the ground motion.
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