05000346/LER-1979-006-03, /03L-0:on 790105,reviewer Noted 781228 Record of Continuous Alarm at Contact Data Record Point F018.Panel C4705 Not Reset.Caused by Failure of Indicator Lights on Panel C4705.Panel Reset,Clearing F018.Surveillance Modified

/03L-0:on 790105,reviewer Noted 781228 Record of Continuous Alarm at Contact Data Record Point F018.Panel C4705 Not Reset.Caused by Failure of Indicator Lights on Panel C4705.Panel Reset,Clearing F018.Surveillance Modified

ML19270F333
Person / Time
Site:	Davis Besse
Issue date:	01/31/1979
From:	Chesko R TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19270F330	List: 05000346/LER-1979-006, Forwards LER 79-006/03L-0 05000346/LER-1979-006-03, /03L-0:on 790105,reviewer Noted 781228 Record of Continuous Alarm at Contact Data Record Point F018.Panel C4705 Not Reset.Caused by Failure of Indicator Lights on Panel C4705.Panel Reset,Clearing F018.Surveillance Modified
References
LER-79-006-03L, LER-79-6-3L, NP-33-79-09, NP-33-79-9, NUDOCS 7902060269
Download: ML19270F333 (3)

LER-1979-006, /03L-0:on 790105,reviewer Noted 781228 Record of Continuous Alarm at Contact Data Record Point F018.Panel C4705 Not Reset.Caused by Failure of Indicator Lights on Panel C4705.Panel Reset,Clearing F018.Surveillance Modified

Event date:
Report date:
3461979006R03 - NRC Website

text

NRC F ORM 366 (7 77)

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d EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h l o l 2 l l While reviewing ST 5016.03, Non-supervised Fire Alarm Circuit Checks on 1/5/79, the designated reviewer noted that a deficiency had been written on 12/2',/78 stating l

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bj TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE

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1 SUPPLEME! TEAL INFORMATION FOR LER NP-33-79-09 DATE OF EVENT: January 5, 1979 FACILITY: Davis-Besse Unit 1 Alarm Point F-018 was in alarm with no detectors 1DENTIFICATION OF OCCURRENCE:

in alana state rendering it inoperable The unit was in Mode 1, with Power (MWT) = 2725, Conditions Prior to Occurrence:

and Load (Gross MWE) = 912.

While reviewing ST 5016.03, "Non-supervised Fire Alarm Description of Occurrence:

the designated reviewer noted Circuit Checks", on January 5, 1979 at 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />, a deficiency had been written on December 28, 1978 stating that Contact Data Investigation on January 5, 1979 at that Logger Point "F-018" was in continuous alarm.F-018 was the Containment Fire Alarm and th the local 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> showed that Panel C4709, which feeds C4705 through C4706, was working and no alarms This indicated that F-018 was receiving a false alarm signal and should Containment in the Action Statement of Technical were present.

have been declared inoperable, placing the unit 28, 1978, which requires a fire watch patrol.

Specification 3.3.3.8.a on Decemberidentified as a Technical Specification detector This was not done as it was not then.

28, 1978, but no work request was submitted A deficiency was written on December until January 4,1979, when the designated reviewer noticed, during a cursory It was not until 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> on that no work request had been written.

was being fonnally reviewed that review,

5016.03 January 5,1979, when Surveillance Test ST it was recognized that a Technical Specification detector was involved.

Troubleshooting revealed two Indicating lights inoperable on Panel C4705 and that Panel C4705 was not reset.

Resetting Panel C4705 at 1547 hours0.0179 days <br />0.43 hours <br />0.00256 weeks <br />5.886335e-4 months <br /> on January 5,1979 from the Action Statement. This was within the cleared F-018 and removed the unit allowable time requirement of one hour so no fire watch patrol was established.

The f ailure of the indicating lights Designatiop of Apparent Cause of Occurrence _:

on Panel C4705 prevented plant personnel f rom knowing that Panel C4705 needed to be been reset after alarm on Panel C4706 had cleared and been reset.

reset and had not Failure to identify F-018 as a Technical Specification alarm allowed a delay in initiating corrective action.

LER #79-006

l

. TOLE'D0 EDISON COMPANY l

DAVIS-BESSE NUCLEAR POWER STATION SUPPLC4 ENTAL INFORMATION FOR LER NP-33-79-09 PAGE 2 Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. No fires occurred in containment during the time thgt Panel C4705 was not reset.

In addition, Panel C47C9 was operabic and could alarm locally in RACA (radiation access control area).

Corrective Action

Under Work Request IC-013-01-79, at 1547 hours0.0179 days <br />0.43 hours <br />0.00256 weeks <br />5.886335e-4 months <br /> on January 5, 1979, Panel C4705 was reset, clearing F-018 and removing the unit from the Action Statement of Technical Specification 3.3.3.8.a.

A note was also affixed to Panel C4706 stating that Panel C4705 must also be reset af ter Panel C4706 is reset to clear alarms.

In addition, ST 5016.03 has been modified to identify Technical Speci-fication alarms and add a lamp test.

I Failure Data: There have been no previously reported sLailar occurrences.

LER #79-006 t