05000346/LER-1978-064-03, /03L-1:on 780608,radiation Monitor Re 5030 Pump Failed After Large Flow Oscillations Discovered.Caused by High Ambient Temps.Pump Repaired & Ventilation Requested for Cabinet

/03L-1:on 780608,radiation Monitor Re 5030 Pump Failed After Large Flow Oscillations Discovered.Caused by High Ambient Temps.Pump Repaired & Ventilation Requested for Cabinet

ML19319B604
Person / Time
Site:	Davis Besse
Issue date:	07/05/1978
From:	TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19319B592	List: 05000346/LER-1978-064-03, /03L-1:on 780608,radiation Monitor Re 5030 Pump Failed After Large Flow Oscillations Discovered.Caused by High Ambient Temps.Pump Repaired & Ventilation Requested for Cabinet ML19319B591
References
LER-78-064-03L, LER-78-64-3L, NUDOCS 8001270120
Download: ML19319B604 (2)

LER-1978-064, /03L-1:on 780608,radiation Monitor Re 5030 Pump Failed After Large Flow Oscillations Discovered.Caused by High Ambient Temps.Pump Repaired & Ventilation Requested for Cabinet

Event date:
Report date:
3461978064R03 - NRC Website

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U.4. NUCLEAR REGULATORY CCMMISSICN AR

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LICENSEE EVENT REPORT

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1 (PLEASE P1 TNT OR TYPE ALL REQUIRED INFORMATIONI q

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'S REPQRT CATE os EVENT OATE 6

W 61 OCCKETN.'.'IR to EVENT DESCRIPTION AND PRC8ABLE CCNSECL.~ a flow oscillations]

[ o i:i l On June 3,1978 at 0600 hours0.00694 days <br />0.167 hours <br />9.920635e-4 weeks <br />2.283e-4 months <br />, crerations eersonnel discovered larre The ou=u in 1 in the flow rate of Containnent Post-Accident Radiation Monitor RE 5030.

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recuired 1

Operability of this nonitor was not l the nenitor failed shortly thereafter.

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There was no danger to the health and safety of the cublici as the unit was in Mode 6.

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i This recorr is being sub=itted as documentation of the Conconent l o ! s I l or unit,perscnnel.

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CAUSE

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ESCRIPTICN ANO CCRRECr1VE ACTICNS h tenceratures in the cabi-l

{ i ) o } } The cause of the cu=o failure is attributed to high a=bient 1

J The pu=o was tepaired, and a Facility Chrige Recuest written which requests lij j[ net.

Previcus pung related proble=s with radia-j ventilation to be added to the cabinet.

r,;,il tion acnitors have been reporred in !.icensee Event Reports NP-33-78-30 and l

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NP-33-78-54, 30 g,,,g; 7

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LEDO EDISON COMPANY i

DAVIS-BESSE UNIT ONE NUCLEAR PCWER STATION SUPPLEVE' ITAL INFORMATION FOR LER NP-33-78-81 PAGE 2 0F 2 Designation of Anoarent Cause of Occurrence: All three incidents were caused by personnel errors. The electrician bu= ped into the undervoltage relay.

The operator lined the synchroscope to the wrong bus for botn attenots to trans-fer essential bus D1 power supply from Diesel Generator 1-2 to bus D2.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. The core decay heat was extrenely Icw since the unit had been shutdown since April 28, 1978. The brief loss of decay heat flow did not cause excassive core tenperatures.

Corrective Action

At 1621 hours0.0188 days <br />0.45 hours <br />0.00268 weeks <br />6.167905e-4 months <br /> on June 15, 1978,. essential bus D1 was re-energized by perfarning a " dead transfer" from the Centrol Room of power from has D2 to essen-tial bes Dl.

The operator was instructed to be = ore careful when transferring bus power and the electricians were instructed to be core careful when woricing en live brea'uirs.

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l s"/Failure Data: A previous loss of decay heat flev due to an essential bus being y

de-energized by personnel error was reported in Licensee Event Report P-33-78-72.

The bus was de-energized initially ac different locatiens and personnel were perfor dng different activities at the eine of the incidents.

LER #78-067 P

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