ML13333B979
| ML13333B979 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/17/1983 |
| From: | Paulson W Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| LSO5-83-11-032, LSO5-83-11-32, NUDOCS 8311180290 | |
| Download: ML13333B979 (19) | |
Text
UNITED STATES 0
NUCLEAR REGiATORY COMMISSION WASHINGTON, D. C. 20555 November 17, 1983 Docket No. 50-206
-S05-83-11-032 LI CNSEE Southern Cal fornia Edison Company FACILITY:
San Onofre Generating Station, Unit No. 1
SUBJECT:
SUMMARY
OF NOVEMBER 8, 1983 MEETING On November 8, 1983, members of the NRC staff met with representatives 6f Southern California Edison Company (SCE).
The purpose of the meeting was to discuss SCE's approach to return San Onofre Unit No. 1 to power operation. Enclosure 1 is a list of attendees.
BACKGROUND By letter dated. June 15, 1982, following several meetings with the NRC staff, SCE committed to keep San Onofre Unit No. 1 shutdown until the seismic capability of the plant was upgraded.
On August 11, 1982, the NRC issued an order confirming SCE's commitment. Subsequently, SCE ceased rost work on upgrading the facility pending their development of a long-term integrated backfit program that would include regulatory initiated and station betterment capital improvements. This program s ne deve~lopme~nt and several meetings with the NRC staff have bean held.
Concurrently, SCE is developing a plan for.the return to power of San Onofre Unit No.
- 1.
The November 8, 1983 meeting dealt with this a::er olan.
SUMMARY
is a copy of the handout used by-SCE during the meeting.
The licensee indicated that about $100million was spent on seismic upgrade work during the current shutdown. In addition, about $50 million has been spent on other items such as TMI modifications. SCE indicated that an additional 570 million would be required to finish the seismic upgrade work and they want to do this work as part of the long-term program. With regard to restart, SCE's plan is to demonstrate that the facility can safely return to power. The licensee stated that they want to assure that San Onofre Unit No. 1 has the capability to reach hot standby (Mode 3) in the event of a 0.67g earthquake. As indicated in Enclosure 2, the licensee is proposing to establish acceptability criteria to be used in judging the availability of safe shutdown systems following a 0.67g earthquake.
These acceptability criteria will consider, among other things use of higher damping for all sizes of piping, an alternative 8311180290 31117 PDR ADOCK o5000r66 P
2 -
November 17, 1983 method to the use of broadened response spectra in piping analysis, functionality stress limits for piping and pipe supports, etc.
- Further, the licensee stated that they would propose that the acceptability criteria be applicable for the remaining term of the license.
The licensee proposed additional meetings to discuss the proposed return to power plan. Subsequently, a management meeting has been scheduled for November 29, 1983 and a meeting to discuss the details of the plan has been scheduled for December 15, 1983.
Original signed by Walter A. Paulson, Project Manager Operating Reactors Branch #5 Division of Licensing
Enclosures:
- 1. Attendance list
- 2. SEC Handout DISTRIBUTION Docket NRC PDR Local PDR ORB #5 Reading DCrutchfield WPaulson OELD EJordan JTaylor ACRS (10)
NRC Participants NSIC cc list DL
- 5 DLX 1W on:jc DCr ield
- 3) /1 83 t? /83
Mr. R. Dietch cc Charles R. Kocher, Assistant General Counsel
- -James Beoletto, Esquire Southern California Edison Companiy Post Office Box 800 Rosemead, California 91770 David R. Pigott Orrick, Herrington & Sutcliffe 600 Montgomery 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/oU. S. NRC P. 0. Box 4329 San Clemente, California 92672
.Mayor City of San Clemente San Clemrente, 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
Enclosure S
0 ATTENDANCE LIST NOVEMBER 8, 1983 MEETING NRC STAFF & SOUTHERN CALIFORNIA EDISON CO.
Name Affiliation W. Paulson
-NRG, D. Crutchfield NRC C. Grimes NRC F. Miraglia NRC K. Baskin SCE M. Medford SCE P. Krieger SCE RETURN TO SERVICE PLAN SAN ONOFRE UNIT 1 NRC MEETING NOVEMBER 8, 1983
AGENDA INTRODUCTION K. BASKIN CURRENT PLANT STATUS R. KR.IEGER RETURN TO SERVICE PLAN R. KRIEGER SCHEDULE R. KRIEGER
CURRENT PLANT STATUS MODIFICATIONS PRIOR TO 1982 0
REACTOR COOLANT LOOP EQUIPMENT SUPPORTS INSTALLED 0
CONTAINMENT OKAY AS IS 0
NEW SPHERE ENCLOSURE BUILDING 0
NEW DIESEL GENERATOR BUILDING 0
NEW DIESEL GENERATORS AND AUXILIARY SYSTEMS 0
NEW AUXILIARY FEEDWATER DISCHARGE PIPING 0
SERVICE WATER RESERVOIR OKAY AS IS 0
ELECTRICAL EQUIPMENT ANCHORAGES HAVE BEEN MODIFIED 0
CONTROL BUILDING, REACTOR AUXILIARY BUILDING, SEAWALL OKAY AS IS
CURRENT PLANT STATUS MODIFICATIONS SINCE 1982 0
TURBINE BUILDING STRUCTURAL MODIFICATIONS INSTALLED (SOUTH TURBINE EXTENSION NOT COMPLETED) 0 MODIFICATIONS TO MASONRY WALL CONNECTIONS IN THE VENTILATION BUILDING & FUEL BUILDING INSTALLED. ADDITIONAL MODIFICATIONS TO MASONRY WALLS INSTALLED IN THE TURBINE BUILDING 0
MASONRY WALL TEST PROGRAM SUCCESSFULLY COMPLETED 0
STRENGTHENING BRACE ADDED TO THE FUEL BUILDING AT THE EAST WALL OF THE NEW FUEL ROOM 0
STRENGTHENING BEAM ADDED TO THE INTAKE STRUCTURE PUMP WELL WALLS 0
IN-SITU SOIL CONDITIONS MAPPED AND DEFINED o
APPROXIMATELY 1,800 OF 4700 PIPING SUPPORTS MODIFIED OR INSTALLED O
APPROXIMATELY 400 OF 600 CABLE TRAY MODIFICATIONS INSTALLED OR MODIFIED 0
APPROXIMATELY 1300 OF 1500 MODIFICATIONS TO CONDUIT SUPPORTS INSTALLED OR MODIFIED 0
APPROXIMATELY 300 OF 600 CABLE TRAY TIEDOWN LOCATIONS MODIFIED 0
A NEW SEISMICALLY QUALIFIED CONTROL ROOM CEILING INSTALLED 0
A NEW AUXILIARY FEEDWATER TANK CONSTRUCTED 0
CONTAINMENT SPRAY RINGS MODIFIED
RETURN TO SERVICE PLAN O
SEISMIC HAZARD THE SEISMIC HAZARD HAS BEEN GIVEN UNDUE EMPHASIS AT THE SAN ONOFRE SITE.
SEISMIC SHOULD NOT BE A SIGNIFICANT CONCERN FOR THE PLANT AS A WHOLE.
0 SAF.E SHUTDOWN ALL STRUCTURES,;. SYSTEMS AND COMPONENTS REQUIRED TO -SAFELY SHUT DOWN FOLLOWING AN EARTHQUAKE WILL BE INDIVIDUALLY EVALUATED TO ENSURE THEIR AVAILABILITY FOLLOWING A 0.67G EARTHQUAKE.
SEISMIC HAZARD 0
GROUND MOTION 0
EARTHQUAKE EXPERIENCE 0
ANALYSIS MARGINS 0
SEISMIC RISK
.GROUND MOTION.
THIS TASK CONSISTS OF ASSEMBLING INFORMATION WHICH DEMONSTRATES (1) THAT THE SONGS 1 PGA OF 0.67G REPRESENTS A TWO STANDARD DEVIATION EVENT, AND (2) INSTRUMENTS USED TO MEASURE EARTHQUAKE DATA TEND TO OVERESTIMATE GROUND ACCELERATION.
IN ADDITION, INFORMATION PERTAINING TO EARTHQUAKE RETURN PERIODS WILL BE ASSEMBLED FOR SEISMIC RISK STUDIES.
EAR1HQUAKE EXPERIENCE THIS TASK CONSISTS OF ASSEMBLING INFORMATION PERTAINING TO THE EXPERIENCE OF STRUCTURES AND POWER PLANTS IN RECENT EARTHQUAKES.
ANALYSIS MARGINS THIS TASK CONSISTS OF DOCUMENTING THE VARIOUS MARGINS WHICH EXIST IN THE SEISMIC ANALYSES OF STRUCTURES AND COMPONENTS. SPECIFIC MARGINS PERTAINING TO SONGS 1 ANALYSES WILL BE IDENTIFIED.
PLANT SPE IFIC APPLICABILITY OF MARGINS WILL BE ADDRESSED.
SEISMIC RISK THIS TASK CONSISTS OF AN ATTEMPT TO ASSESS THE SEISMIC RISK AT SONGS 1 BASED ON THE RESULTS OF PROBABLISTIC RISK ASSESSMENTS DONE AT OTHER PLANTS.
SITE SPECIFIC EARTHQUAKE RECURRENCE DATA WILL BE UTIL1/ED.
SAFL SHUTDOWN 0
SAFE SHUTDOWN SYSTEMS 0
ACCEPTABILITY CRITERIA 0
SYSTEM REVIEW
SAFT SHUTDOWN SYSTEMS THIS TASK CONSISTS OF IDENTIFYING A MINIMUM LIST OF SYSTEMS AND EQUIPMENT WHICH WOULD BE REQUIRED TO SAFELY SHUT DOWN THE PLANT FOLLOWING AN EARTHQUAKE.
ACCEPTABILITY CRITERIA THIS TASK CONSISTS OF DEVELOPMENT OF CRITERIA CONSISTENT WITH ANALYSIS..MARG..INS AND EARTHQUAKE EXPERIENCE.TO BEUSED IN RETURN TO SERVICE EVALUATION.
THE ACCEPTABILITY CRITERIA WILL CONSIDER THE FOLLOWING:
- 1.
USE OF HIGHER DAMPING FOR ALL SIZES OF PIPING.
2.-
ALTERNATIVE METHOD TO THE USE OF BROADENED RESPONSE SPECTRA IN PIPING ANALYSIS.
- 3.
FUNCTIONALITY STRESS LIMITS FOR PIPING AND PIPE SUPPORTS.
- q.
USE OF TEST DATA.
- 5.
REDUCTION FACTORS ASSOCIATED WITH SSI AND OTHER STRUCIURE RESPONSE CONSERVATISMS AS APPROPRIATE.
- 6.
USE OF INELASTIC CRITERIA FOR THE EVALUATION OF STRUCTURES.
SYSTEM REVIEW THIS TASK CONSISTS OF REVIEWING EACH OF THE SAFE SHUTDOWN SYSTEMS ON A "LINE BY LINE" BASIS TO ENSURE THEIR AVAILABILITY IN THE AS-IS CONDITION FOLLOWING A 0.67G EARTHQUAKE BASED ON THE ACCEPTABILITY CRITERIA.
SCHEDULE NOVEMBER 8 NRC MANAGEMENT MEETING NOVEMBER 22 PRELIMINARY RESULTS FOR NRC TECHNICAL MEETING DECEMBER 15 FINAL RESULTS FOR NRC TECHNICAL MEETING