ML20058K800
| ML20058K800 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 02/10/1975 |
| From: | Larson C NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 9102140418 | |
| Download: ML20058K800 (1) | |
Text
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NORTHERN STATES POWER COMPANY
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}tnticello, Mimesota 55302 I
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- Febmary 10,1975 i
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Mr. J. G. Keppler, Director p.
Regian:III 30ffice of Inspection and Enforcetent
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United States Nuclear Regulatory Comission 799EcoseveltRoad Glen 4Ellyn, Illinois 60137 g
Dear Mr. Keppler:
!sNfICEl10 NJCLEAR GENERATING PIM Docket No. 50-263 License No. DPR-22
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On Febmarf 9,1975, smke was obserted cctaing frca the mtor starter for reactor water cleanup discharge ifolatien valve.10 2399.
Investi-gation revealed that a started relay coil resulted in overneating of i
the control transformer in the mtor starter. Failure of the contml transfomer caused the isolation valve to be iraperabic. Neither this I
valve nor another valve in the discharge line was placed in the closed position as required by Technical Specification 3.7 D 2. The failed relay and rotor starter wre replaced and the systea was retumed to r.orm1 cperation within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. Further investigation of this c~ccurrence iscontiming.
Yours verf tgily, (b
g C. 2. lars PlantManager CEl/ma
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