ML20090E041
| ML20090E041 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 04/02/1975 |
| From: | NIAGARA MOHAWK POWER CORP. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20090E038 | List: |
| References | |
| AO-50-220-75-5, NUDOCS 8303110442 | |
| Download: ML20090E041 (2) | |
Text
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N6 AGAMA MOHAWK POWER CORPORATION NIAGAn4 MOHWWE a
DATEt-April 2. M75
SUBJECT:
Abnormal Occurrence Report No. 50-220 75-5 (24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Kotification) 1he enclosed preliminary AOR is being submitted in accordance with Technical specification Section 6 Cbnfirming C. Stuart phone conversatica with AEC RO:I office on April 1,1975 102 James P O'Rei!2y Directorate of Regulatory Operations Rsgion 1 s-631 Park Avenue King of' Prussia, Pa.
19406 Pit 3f:
Niagste Fbhawk Power Corporation Nine Nils Point - James A. FitzPatrick Site P.O. Box #32 f,ycoming,, New York 13095 Docket No. 50 _ 220 REFERENCEL License DPR-63 Report No,t 50- m /75-S Report Date 4-2-75 Occurrence Date 4-I-75 Pacility:
NY te!P-I g
Identification of Occurrance:
Failure er the Emergency Venti 2ation Systems to ibnctierr as designed genen initiated during routine-surveillmace testing.
t 8303110442 750414 gDRADOCK 05000220 PDR
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PAGE 2 Conditions Prior to Occurrence:
94.51L Steady State Power Routine Shutdown Rat Stundby Cold Shutdown Rad Changes
~ Refueling Shutdbwa Routina Startup other-Description of the Occurrer.ce:.
He Dnergency Ventilation System is a standby system designed to operate to mitigate the consequences of high radiation levels in the normal ventilation system. During routine operater surveillance (Tech Spec;. 4.4.4 aner Tables. 3.6r.2J f 4.6.2j). H e system inlet ventilation valve (B.V 202-36} f&iled to open.. due to a broken stem in one RPS solenoid valve and metal filings-in the other
(% Iogic).
Aphrarent Cause of the occurrence:
Design Procedure Manufacture Unusual Service Condities Installatica/
Coast.
Operator I
Camrponent Failure Analysis of Occurrence:
he system was inmediately restored to service and thus would have performed its intended function. Even without system operation under the worst condition,. the site boundary doses-would have been less than required by 10' CFR.100*.
Herefore, no hazard was to the general public.
He RPS solenoids will be replaced. presented Corrective Actions.
he blocking valve-202-35 was immediately cp.-d (=====11y) thus satisfying the requirements of Tech Spec 3.4~.4.
has been-ordered; by SORC te evaluate operaties-withAn Engineering Review of the system 202-36 normally open and. the related RPS ihneticos.
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Failure Pata:
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- g...y.
ASCO Yhlve SN'831639-a.
- FE&R Supplement t VI.It' l
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