ML19319B768

RO NP-33-77-37:on 770804,control Room Emergency Ventilation Condensing Units Deliberately Removed from Svc.New Overload Heaters Installed Increasing Condensing Unit Size. Ventilation Sys Returned to Svc on 770804

ML19319B768
Person / Time
Site:	Davis Besse
Issue date:	08/30/1977
From:	George T, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19319B668	List: ML19319B667 ML19319B768
References
LER-RO-770830, NUDOCS 8001270236
Download: ML19319B768 (3)

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TOLEDO EDISON CCMPANY '

Q DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR IER NP-33-77-37 l

DATE OF EVENT: August 4, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Deliberate entry into the Actic7 Statement of Technical Specification 3.7.6.1. Removal of the Control Room Emergency Ventilation Condensing Un cs trem service, one at a ti=e.

Conditions Prior to Occurrence: The plant was in Mode 3, with Power (MWT) = 0, and Load OS~E) = 0.

Descriction of Occurrence: At 0940 hours0.0109 days <br />0.261 hours <br />0.00155 weeks <br />3.5767e-4 months <br /> on August 4, 1977, one control Room Emergency Ventilation System Condensing Unit at a ti=e was taken out of service to install new overload heaters. The inoperability of these condensing units caused the Control Roon Emergency Ventilation System Trains 1 and 2 to be inoperable, one at a time. This action caused the Station to enter the A -ion Statement of Technical Specification 3.7.6.1.

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Designatfor mf Aeparent Cause of Occurrence: The condensing units were taken out of service to install new overload heaters. The new overload heaters replaced the originals which did not mee. the new system requirements becauce at a system revision which increased the size of the condensing units.

Ana:ysis of Occurrence: There was no threat to the health and safety of the public or to station personnel. One Control Room Emergency Ventilation System Train was operable at all ti=es.

Corrective Action: Both Control Room Emercancy_ Ventilation System Trains had the new overload heaters installed. Both Control Room Emergency Ventilation Systems were run, tested and declared operable at 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on August 4, 1977.

This removed the Station from the Action Statement at Technical Specification 3.7.6.1. The overload heaters have now been replaced; therefore, the cause of this occurrence is not expected to become repetitive.

Failure Data: No previous similar events have occurred.

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