05000334/LER-1979-009-03, /03L-0 on 790320:during Surveillance Test,Diesel Generator 1 Output Breaker Failed to Close Upon Actuation of Control Switch.Cause of Inoperable Breaker Unknown.Operators Reinstructed in Test Circuit & Surveillance Increased

/03L-0 on 790320:during Surveillance Test,Diesel Generator 1 Output Breaker Failed to Close Upon Actuation of Control Switch.Cause of Inoperable Breaker Unknown.Operators Reinstructed in Test Circuit & Surveillance Increased

ML19269E595
Person / Time
Site:	Beaver Valley
Issue date:	06/21/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19269E593	List: 05000334/LER-1979-009-03, /03L-0 on 790320:during Surveillance Test,Diesel Generator 1 Output Breaker Failed to Close Upon Actuation of Control Switch.Cause of Inoperable Breaker Unknown.Operators Reinstructed in Test Circuit & Surveillance Increased 05000334/LER-1979-013-03, /03L-0 on 790522:during Surveillance of Control Room Habitability Sys,Pressure Regulators for Control Room Pressurization Were Found Cycling.Caused by Improper Calibr. Controls Tuned & Procedure Revised ML19269E592
References
LER-79-009-03L, LER-79-9-3L, NUDOCS 7906290333
Download: ML19269E595 (1)

LER-1979-009, /03L-0 on 790320:during Surveillance Test,Diesel Generator 1 Output Breaker Failed to Close Upon Actuation of Control Switch.Cause of Inoperable Breaker Unknown.Operators Reinstructed in Test Circuit & Surveillance Increased

Event date:
Report date:
3341979009R03 - NRC Website

text

U. S. NUCLEAR REGULATORY COMMISSION NRC FORM 366 um LICENSEE EVENT REPORT CONTROL BLOCK: l l

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l l Ih (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI f oTT1 I P l A l B l V l S l 1 l@l 0 10 l-l 0 l 0 l 0 l 0 l 0 l-l0 l 0 l@l 4 l1l1l1l1l@l l

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8 60 61 COCK ET NUM8 ER 68 69 EVENT DATE 14 IS REPORT OATE SO EVENT OESCRIPTION AND PROSA8LE CONSEQUENCES h

,Ql At approximatelv 0230 hours0.00266 days <br />0.0639 hours <br />3.80291e-4 weeks <br />8.7515e-5 months <br /> during performance of a surveillance test, the No. 1 l

o 3 [ Diesel Generator output breaker failed to close when the control switch was l

ITTTl I actuated. The test circuit installed to monitor breaker control cit.uitry was I

o s [ observed. but due to an incomplete understanding by the operator, not all of the 1

o is I status licht conditions were renorted. The diesel cenerator was declared I

oI7 [ inoperable at 0310 hours0.00359 days <br />0.0861 hours <br />5.125661e-4 weeks <br />1.17955e-4 months <br />. The surveillance test was successfully completed at l

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l 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />.

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35 CAUS: CESCRIPTION AND CORRECTIVE ACTIONS ieo l The cause of the inoperable breaker is unknown. The breaker test panel remains

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,ii l installed to conitor the breaker closing contacts. The operators have received I

gl more detailed instructions in the use and interpretation of the test circuit. All I

,,3 l contacts in the control circuit were inspected,ad en diesel generator l

i surveillance test freauency has been increased to weekiv.

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to 412-643-1258 NAME CF PAEPARER PHONE: