ML19282A613

LER 79-017/03L-0:on 790130,photoelectric Smoke Detector Ds 8605-E in Emergency Diesel Generator 1-1 Area Not Functional.Caused by Failure of Detector.New Detector Ordered & Fire Watch Patrol Established in Area

ML19282A613
Person / Time
Site:	Davis Besse
Issue date:	02/26/1979
From:	Chesko R TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19282A609	List: ML19282A608 ML19282A613
References
LER-79-017-03L, LER-79-17-3L, NP-33-79-22, NUDOCS 7903050182
Download: ML19282A613 (2)

Text

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NRC FORM 366 (7 77)

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DATE 80 7 8 60 61 DOCKET NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o 2 l While conducting surveillance testing, it was determined that Photoelectric Smoke o 3 i Detector DS 8605-E in the Emergency Diesel Generator 1-1 area was not functional. 1 I

I o I 4 I l DS 8605-E was declared inoperabic at 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on 1/30/79 which placed the unit in A fire watch patrol was established and I o s ! the Action Statement of Tech Spec 3.3.3.2.

The four other area l o G l will be maintained until the detector is declared operable.

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[6TT] i photoelectric detectors in this open room are operable, and a fire watch patrol is 1

o a : being maintained in this area. (NP-33-79-22)

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41 43 44 47 3/ 40 42 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 l

l i l o l l The f ailure of Photoelectric Detector DS 8605-E was the cause of the occurrence.

3 i l A new detector has been ordered and will be installed upon receipt at the station.

, , , 7 y l It is expected to be delivered in eight to ten weeks.

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79 22 DATE OF EVENT: January 30, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:

Photoelectric Detector DS 8605-E did not pass Sur-veillance Test ST 5016.04.

Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2550, and Load (Gross MWE) = 825.

Description of Occurrence: While conducting Surveillance Test ST 5016.04, " Detector Channel Functional and Supervisory Circuits Checks", it was determined that Photo-electric Smoke Detector DS 8605-E in the Emergency Diesel Generator 1-1 area was not functional and a test deficiency was prepared. This lead to DS 8605-E being declared inoperable at 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on January 30, 1979, which placed the unit in the Action Statement of Technical Specification 3.3.3.a. A fire watch patrol was established at that cime.

Designation of Apparent Cause of Occurrence: The failure of Photoelectric Detector DS 8605-E was the cause of the occurrence.

Analysis of Occurrence: The four other area photoelectric detectors in this open room are operable, and a fire watch patrol is being maintained in this area.

Corrective Action: A new detector has been ordered and will be. installed upon receipt at the site. It is expected to be delivered in eight to ten weeks. A fire watch patrol is being maintained in this area.

Failure Data: There have been no previously reported f ailures of photoelectric detectors.

LER #79-017