05000346/LER-1978-085-03, /03L-0:on 780728,containment post-radiation Monitor Re 5029 Declared Inoperable.Caused by Component Failure.Motor Pulley Replaced & Belt Installed.Monitor Re 5029 Tested & Returned to Svc on 780801

/03L-0:on 780728,containment post-radiation Monitor Re 5029 Declared Inoperable.Caused by Component Failure.Motor Pulley Replaced & Belt Installed.Monitor Re 5029 Tested & Returned to Svc on 780801

ML19326A076
Person / Time
Site:	Davis Besse
Issue date:	08/21/1978
From:	TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A074	List: 05000346/LER-1978-085, Forwards LER 78-085/03L-0 05000346/LER-1978-085-03, /03L-0:on 780728,containment post-radiation Monitor Re 5029 Declared Inoperable.Caused by Component Failure.Motor Pulley Replaced & Belt Installed.Monitor Re 5029 Tested & Returned to Svc on 780801
References
LER-78-085-03L, LER-78-85-3L, NUDOCS 8001310646
Download: ML19326A076 (2)

LER-1978-085, /03L-0:on 780728,containment post-radiation Monitor Re 5029 Declared Inoperable.Caused by Component Failure.Motor Pulley Replaced & Belt Installed.Monitor Re 5029 Tested & Returned to Svc on 780801

Event date:
Report date:
3461978085R03 - NRC Website

text

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O U. S. NUCLEAR REGULATORY COMMISSION su

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28,1978 at 2110 hours0.0244 days <br />0.586 hours <br />0.00349 weeks <br />8.02855e-4 months <br />, Containment vessel Post Accident On July This placed(

RE 5029 was declared inoperable (the low flow light was found to be lit).

ths Unit in Action Statement A of Technical Specification 3.3.3.6 which requires the j

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l (NP-33-78-101) l l RE 5030 was operable throughout this occurrence.

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] l ST 5099.]05 at 2022 hours0.0234 days <br />0.562 hours <br />0.00334 weeks <br />7.69371e-4 months <br /> on August 1,1978 removed ~the unit from 31 i

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, TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-78-101 DATE OF OCCURRENCE: July 28, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Containment Post Accident Radiation Monitor RE 5029 inoperable.

Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 554, and Load (MWE) = 140 Description of Occurrence: On July 28, 1978 at 2110 hours0.0244 days <br />0.586 hours <br />0.00349 weeks <br />8.02855e-4 months <br /> during the performance of Surveillance Test ST 5099.05, " Shift Channel Check of the Radiation Monitoring The radia-System", Radiation Monitor RE 5029 was found to have a low riow light.

tion monitor was declared inoperable by the Shif t Foreman, Technical Specification 3.3.3.6 requires the operability of both Containment p}VesselPostAccidentRadiationMonitorsinModes1,2and3.

Action Statement (a)

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states that the inoperable channels must be restored to operable status within

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30 days.

Designation of Apparent Cause of Occurrence: The cause of the occurrence was com-sn?9 thren its belt,__ yielding the low flow alarm.

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Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. The other Containment Post-Accident Radiation Monitor, RE 5030, was operable during the period.that RE 5029 was inoperable.

Corrective Action

The motor pulley was replaced by Maintenance personnel under Maintenance Work Order 78-1874. The pump was then started, and the low flow alarm cleared. The monitor was proven to be operable through performance of Surveillance Test ST 5099.05 at 2022 hours0.0234 days <br />0.562 hours <br />0.00334 weeks <br />7.69371e-4 months <br /> on August 1,1978. The unit was removed from Action Statement (a) of Technical Specification 3.3.3.6 at this time. Facility Change Request 78-384 has been issued to request an engineering evaluation of motor related problems on radiation monitors.

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Failure Data: Previous pump related problems with radiation monitors have been re-ported in Licensee Event Reports NP-33-78-30, NP-33-78-54 and NP-33-78-77.

LER #78-085 L