ML13333B995
| ML13333B995 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/30/1983 |
| From: | Paulson W Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8401050674 | |
| Download: ML13333B995 (5) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 December 30, 1983 Docket No. 50-206 LICENSEE:
SOUTHERN CALIFORNIA EDISON.COMPANY FACILITY:
San Onofre Nuclear Generating Station, Unit No. 1
SUBJECT:
SUMMARY
OF DECEMBER 14, 1983 MEETINGS
, e p /16 L On December 14, 1983, representatives of Southern California Edison Company (SCE) and members of the NRC staff met in Bethesda, Maryland. The purpose of the meetings was to discuss (1) SCE's return to service plan for San Onofre Unit No. 1, and (2) SCE's analysis of the vertical spectra appropriate for the seismic reanalysis of Unit No. 1. Enclosure 1 is a list of atten
.dees at the meeting to discuss the return to power plan. is a list of attendees at the afternoon meeting on vertical response spectra.
SCE discussed some of the conservatisms that they perceive are included in the San Onofre Unit No. 1 seismic design. These are summarized in the handouts provided by SCE (Enclosure 3).
The licensee also discussed an assessment of the Unit No. 1 desion against dominant contributors to seismic core melt frequency. This assessment used the results of probabilistic risk assessments done at other plants; however, SCE indicated that they used site specific earthquake recurrence data. The NRC staff commented that (1) the return period used in the analysis may not be conservative when one considers that the eastern plants for which the PRA's were done have return periods much less than that used by SCE, and (2) the peak acceleration is not the parameter to use for comparisons; rather, one needs to look at the spectra.
SCE also discussed proposed acceptance criteria to be used in the evaluation of seismic capability for the return to power. These proposed criteria will consider the following:
- 1. Reduction of in-structure response.
- 2. Use of higher damping for all sizes of piping.
- 3. Alternative method to the use of broadened response spectra in piping analysis.
- 4. Functionality stress limits for piping and pipe supports.
- 5. Use of inelastic criteria for the evaluation of structures.
- 6. For small piping, use of test data and walkdowns.
By letter dated April 2, 1983, the NRC staff raised a concern regarding whether the vertical spectra (2/3 horizontal sprectra) used for the seismic reevaluation of San Onofre Unit No. 1 was appropriate. This concern was based on recent work 9401050674 831230 PDR ADOCK 05000206 P
-2 reported on near source vertical acceleration data.
SCE presented analysis supporting the vertical spectra used in their reevaluation.
is a set of handouts used during the meeting. SCE will submit a report documenting their analysis early in 1984.
ORIGINAL SIGNED BY Walter A. Paulson, Project Manager Operating Reactors Branch #5 Division of Licensing
Enclosures:
As stated cc w/enclosures:
See next page DISTRIBUTION L Docket NRC PDR Local PDR ORB #5 Reading DCrutchfield WPaulson OELD EJordan JTaylor ACRS (10)
NRC Participants NSIC cc list DLB #5 D
WPaulson:jc D
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,,N LY// 83
Mr. K. Baskin cc Charles R. Kocher, Assistant General Counsel James Beoletto, Esquire Southern California Edison Company Post Office Box 800 Rosemead, California 91770 David R. Pigott Orrick, Herrington & Sutcliffe 600 Montogmery Street San Francisco, California 94111 Harry B. Stoehr San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector/San Onofre NPS c/o U.S. NRC P. 0. Box 4329 San Clemente, California 92672 Mayor City of San Clemente San Clemente, California 92672 Chairman Board of Supervisors County of San Diego San Diego, California 92101 California Department of Health ATTN:
Joseph 0. Ward, Chief Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California 95814 U.S. Environmental Protection Agency Region IX Office ATTN:
Regional Radiation Representative 215 Freemont Street San Francisco, California 94111 John B. Martin, Regional Administrator Nuclear Regulatory Commission, Region V 1450 Maria Lane Walnut Creek, California 94596
ATTENDANCE LIST DECEMBER 14, 1983 MEETING NRC STAFF AND SOUTHERN CALIFORNIA EDISON COMPANY Name Affiliation W. Paulson NRC E. McKenna NRC T. Cheng NRC R. L. Rothman NRC Leon Reiter NRC Bob Jackson NRC C. I. Grimes NRC Lyman Heller NRC D. K. Morton E.G. & G. Idaho S. L. Morton E.G. & G. Idaho Gene Hughes NUCON Inc.
Art Cimento IMPELL Mike Shulman IMPELL Paul Koss Bechtel Rick Ellis Bechtel Scott Tampa Bechtel Russel W. Krieger SCE Mark 0. Medford SCE Jack Rainsberry SCE G. W. Gartland SCE H. G. Hawkins SCE -
Geotech R. L. McNeill Cons. Engr.
D. M. Hadley Sierra Geophysics
ATTENDANCE LIST DECEMBER 14, 1983 MEETING (PM)
NRC STAFF AND SOUTHERN CALIFORNIA EDISON COMPANY Name Affiliation W. Paulson NRC R.L. McNeill Cons. Engr.
R. Jackson NRC Leon Reiter NRC R. L. Rothman NRC J. L. Rainsberry SCE H. G. Hawkins SCE - Geotech D. Hadley Sierra Geophysics