IR 05000206/1972006
| ML13308B386 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/14/1972 |
| From: | Crews J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | |
| References | |
| 50-206-72-06, 50-206-72-6, NUDOCS 8103110351 | |
| Download: ML13308B386 (3) | |
Text
UNITED STATES ATOMIC ENERGY COMMISSION
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DIRECTORATE OF REGULATORY OPERATIONS
REGION V
2111 BANCROFT WAY BERKELEY, CALIFORNIA 94704 KXV.6HI September 14, 1972 JG'. Ke er, Chief Reactor Testing and Operations Branch" Directorate of Regulatory Operations, HQ 2RO NQUIRY RFPORT /72-06 SOUTHERN CALIFORNIA EDISON COMPANY (SAN ONOFRE #1)
J RESUMPTION OF.FULL POWER OPERATION FOLLOWING TURBINE OVERSPEED EVALUATION subject inquiry report is forwarded for' informatio The information provided by Mr.'Curran suggests appropriate evaluation by SCE and Westinghouse preceeded the decision to resume full power operation on September 13, 197 We plan to examine the records of SCE's evaluation of this occurrence during our next routine inspectio t I
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n Ch f, eactor Co truction,.
nd Operations ranch Enclosure*
RO Inquiry Rpt No 050-0206/72-06 W- "'by J. Crews cc w/encl:
RS, AD for Safety and Security Stds. (3)
L AD for Boil. Water Reactors (2)
L AD for Press. Water Reactors (2)
L AD for Operating Reactors (3)
L AD for Site Safety (2)
RO Office of Operations Evalaution RO AD for Procedures.,
RO AD for Inspection & Enforcement RO Files DR-Cntral Files a
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,UNITED STATES ATOMICENERGY COMMISSION DIRECTORATE OF REGULATORY OPERATIONS
REGION V
2111 BANCROFT WAY BERKELEY, CALIFORNIA 94704 T
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EXT. lB September 14, 1972 RO Inquiry Report No. 050-0206/72-06 uthen California Edison Company San Onofre'Unit No. 1 License No DPR-13 PWR, 1147 Mwt RESUMPTION OF FULL POWER OPERATION FOLLOWING TURBINE OV S D
LUATION Paredby J.*. r Reactor Inspector D ate and M ner AC was Informed Mr. Jarlath Curran' Plant Engineer, notified J. L Crews by telephone on September 14, 197 Description of Particular Event or Circumstance jK, Mr. Curran stated that Westinghouse and SCE had completed their evaluation of the higher thananticipated turbine speed condition experienced during a unit trip on July 29, 197 (See RO Inquiry Report No. 050-0206/72-05, dated August 11, 1972 and SCE report to Licensing, dated August 28, 1972).
This evaluation has revealed an explanation of the turbine speed condition of 133% overspeed, which occured on July 29, and which at that time was judged to be approximately 2% greater than anticipated for such a transien Mr. Curran said their evaluation revealed that the loss of generator field, which preceeded the unit trip, resulted in a turbine-generator speed increase to approximately 2% greater than synchronous speed prior to trip of the unit. Under such circumstances, the turbine overapeed condition of 133% is considered a normal respons The latter response (133% overspeed) is similar, according to Curran, to the response anticipated following malfunction of the turbine governor
.. control, a transient previously evaluate I
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" R04 Inquiry Rot No W
050 206/72-06.-..
-2-Setebe 14,*, 1972 Actio by Licensee
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The power,, level restriction impos'ed followigteJl 9ocrec hasa been lifte Unit load was incrae to 1ul load conditions (450
M'..
?we, gross) on September 13,'.197 "The -*results of SCE's evaluation of the turbine overspeed conditionson JulIy 29i, 1972 are to be reported to AEC Licensing, according to Mr. Curra y. He said this report would be submitted within,30 days, and would s upplement SCE's erirreport of August 28, 197 4...
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