ML13322A948
| ML13322A948 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/16/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Dietch R Southern California Edison Co |
| References | |
| NUDOCS 8010100117 | |
| Download: ML13322A948 (4) | |
Text
t GULATO KE Ifcop UTION:
RTedesco JOlshinski R
DCrutchfield LPDR RScholl TERA DAllison NSIC WRussell, SEPB Docket No. 50-206 NRR Reading OELD ORB #5 Reading OI&E (3)
DEisenhut HSmith Mr. R. Dietch, Vice President RPurple Project Mgr.
Nuclear Engineering and Operations TNovak ACRS (16)
Southern California Edison Company GLainas JHeltemes 2244 Walnut Grove Avenue DKragh (11 - SEP Files)
Post Office Box 80O Rosemead, California 91770
Dear Mr. Dietch:
RE: REQUEST FOR ADDITIONAL INFORMATION ON SEP TOPICS VI-7.B, VI-7.C, VI-10, VII-3, VIII-2 AND VIII-3 (SAN ONFORE NUCLEAR GENERATING STATION, UNIT NO. 1)
We are continuing our review of SEP Topics VI-7.B, ESF Switchover from Injection to Recirculation Mode; VI-7.C, ECCS Single Failure Criteria; VI-10.A, Testing of Reactor Trip System and ESF; VI-10.B, Shared Engineered Safety Features; VII-3, Systems Required for Safe Shutdown; VIII-2, Onsite Emergency Power Systems - Diesel Generator; VIII-3.A, Station Battery Test Requirements and VIII-3.B, DC Power System Bus Voltage Monitoring and Annuniciation. We have found that additional information described in the enclosure to this letter is needed.
We request your response within 45 days ofyour receipt of this letter.
Sincerely, Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing,
Enclosure:
Request for Additional Information on SEP Topics cc w/enclosure:
See next page 8010100 7
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 September 16, 1980 Docket No. 50-206 Mr. R. Dietch, Vice President Nuclear Engineering and Operations Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770
Dear Mr. Dietch:
RE:
REQUEST FOR ADDITIONAL INFORMATION ON SEP TOPICS VI-7.B, VI-7.C, VI-10, VII-3, VIII-2 AND VIII-3 (SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NO. 1)
We are continuing our review of SEP Topics VI-7.B, ESF Switchover from Injection to Recirculation Mode; VI-7.C, ECCS Single Failure Criteria; VI-10.A, Testing of Reactor Trip System and ESF; VI-10.B, Shared Engineered Safety Features; VII-3, Systems Required for Safe Shutdown; VIII-2, Onsite Emergency Power Systems - Diesel Generator; VIII-3.A, Station Battery Test Requirements and VIII-3.B, DC Power System Bus Voltage Monitoring and Annuniciation.
We have found that additional information described in the enclosure to this letter is needed.
We request your response within 45 days of your receipt of this letter.
Sincerely, D nnis M. Crutchfield, Ci Operating Reactors Branch 5
Division of Licensing
Enclosure:
Request for Additional Information on SEP Topics cc w/enclosure:
See next page
Mr. September 16, 1980 cc w/enclosure:
Charles R. Kocher, Assistant Director, Technical Assessment General Counsel Division Southern California Edison Company Office of Radiation Programs Post Office Box 800 (AW-459)
Rosemead, California 91770 U. S. Environmental Protection Agency David R. Pigott Crystal Mall #2 SSamjuel B. Casey Arlington, Virginia 20460 Chickering & Gregory Three Embarcadero Center U. S. Environmental Protection Twenty-Third Floor Agency San Francisco, California 94111 Region IX Office ATTN:
EIS COORDINATOR Jack E. Thomas 215 Freemont Street Harry B. Stoehr San Francisco, California 94111 San Diego Gas & Electric Company P. 0. Box 1831 Richard E. Schaffstall San Diego, California 92112 KMC, Incorporated 1747 Pennsylvania Avenue, N. W.
Resident Inspector Washington, D. C. 20006 c/o U. S. NRC P. 0. Box AA Oceanside, California 92054 Mission Viejo Branch Library 24851 Chrisanta Drive Mission Viejo, California 92676 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:
Chief, Environmental Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California 95814
REQUEST FOR ADDITIONAL INFORMATION ON SEP TOPICS VI-7.B, VI-7.C, VI-10, VII-3, VIII-2 AND VIII-3 As a result of our preliminary review of the subject topics, we will need the information described below in order to determine: (1) how many in verters may be placed on a single power supply during operation or while shutdown, and (2) the potential consequences of losing such power supplies.
- 1. Quantify the number of instrument inverters in your plant and for each inverter:
a) identify the inverter and its power supplies; and b) describe the switching features that are provided to switch inverter power supplies and inverter loads (including synchronization circuits).
- 2. Provide the requirements for:
a) testing the transfer path's described in your responses to 1 above, and b) limiting the number of redundant load groups that may be placed on any maintenance power source during each operating condition.
- 3. Describe the consequence of one or more load groups on a single dc source losing power (e.g. automatic initiation of ECCS, automatic initiation of transfer from ECCS injection made to recirculation mode, loss of indication in the control room, loss of annunciators, loss of plant communications, loss of emergency telephones).