ML20002D270
| ML20002D270 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 01/09/1981 |
| From: | Oubre R SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| RO-80-50, RO-81-1, NUDOCS 8101200221 | |
| Download: ML20002D270 (4) | |
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9 SMUD SACRAMENTO MUNICIPAL UTILITY Di3TRICT C 62h 5 Street. Bcx 1532, Sacramento, California 95813; 0 15) 452-3211 RaR si 30 Jn 9,19P I 1
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!m-e Mr. R. H. Engelken. Director 1,
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3 1990 North California Boulevard Walnut Creek Plaza, Suite 202 U:Inut Creek, California 94936 Re: Operating License DPR-54 Docket No. 50-312 Reportable Occu'rrences 80-50 and 81-1
Dear Mr. Engelken:
In accordance with Technical Specifications Section 6.9.4.1(i) and Appendiv. B, Section S.6.2(c), the Sacramento Municipal Utili ty Dis trict -
submits written confirmation of two 24-hour Licensee Event Reports.
Mr. J. Zwetzig and Mr. H. Canter were notified verbally concerning the details by R. Colombo.
Bechtel Power Corporation notified the District that five NEMA.
Size 3 motor starter coils will not pick up and seal in the steady state condi tion during a degraded switchyard voltage of 214 KV in conjunction with a postulated LOCA. The systems involved include the four Reactor Building Upper Dome Circulators A, B, C and D and the Control Room Emergency Air Supply. The former systems will start during the initial transient but once shut down would not restart.
The Emergency Air Supply could not be started at a degraded voltage of 214 KV in the switchyard.
A Special Order is in effect that recuires the reactor operators to take corrective action to prevent the above-stated problem. At a switch-yard soltage of 216 KV, the operator is instructed to start the Auxiliary Diesel Generators, parallel with the busses, and separate the Nuclear Serv-Ice Systems from the switchyard.
This corrective action will isolate the safety related equipment from the switchyard degraded voltage problem.
A second and unrelated occurrence relates '9 a west perimeter TLD nonitor reading in excess of the established report level. The TLD in loca-tion 3 read 29.5 mR for the fourth quarter of 1980.
This exceeds the pre-0 0 7heq.A
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AH ElECTR!C SYSTE M S E RVIN G MORf T 5t A N 600,000 IN THE HEART OF cat? TORN 4A
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4 Mr. R. H. Engelken January 9, 1981 operational notification by 1.8 mR.
These readings are due to the close a
proximi ty to the Radwaste Storage Facili ty.
The problem will be corrected by radwaste shipments scheduled to commence January 14, 1981.
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Followup reports will be submitted to you prior to January 22 and 18, 1981, respectively.
i Sincerelyn
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W R. P. Oubre' Plant Superintendent i
RP0:RWC:jr cs: Director, MIPC I
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