ML19326A335

LER 78-089/03L-0:on 780809,pump for Re 5030 Found Inoperable During Surveillance Test.Caused by Pump Motor Component Failure.Motors Drawing Excessive Current & Failing at High Ambient Temps.Motor Replaced on Radiation Monitor Re 5030

ML19326A335
Person / Time
Site:	Davis Besse
Issue date:	09/05/1978
From:	Beeler T, Kovach S TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A313	List: ML19326A312 ML19326A335
References
LER-78-089-03L, LER-78-89-3L, NUDOCS 8002030153
Download: ML19326A335 (3)

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_ LICENSEE EVENT REPORT (PLEASE P:*lNT O. YPE .L REQUIRED (NFORMATIONI NTROL BLOCK: l i

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EVENT QATE 75 REPCRT QATE do i 8 60 61 QQCKET NUM8 ER EVENT DESCRIPTION AND PRC8ABLE CONSECUENCES I

l o l 21 1 At 0245 hours0.00284 days <br />0.0681 hours <br />4.050926e-4 weeks <br />9.32225e-5 months <br /> on 8/9/78 while eerf ormine surveillance testine. onerations eersonnel I

Io l2l l discovered that the pump for RE 5030 was inoperable. This placed the unit in the There was no danger to the health and safety of the l l o I 41 I action statement of T.S. 3.3.3.6.

I o i 51 I public or unit personnel. This instrument does not control any eouipment, but is used {

I lo }6 ] l for monitoring ourposes oniv. The other containment oost-accident radiation monitor, (NP-33-78-105) 1 lojyj l RE 5029 was coeraile during the period that RE 5030 was inoperable.

1 10181 I 40 cAUSE COMP. VALVE SYSTEM CAUSE SUSCODE SUSCOCE CooE CooE SusC:oE COMPONENT CCCE leISI l Bl Bl@ l E l@ l 3 l@ l Ml 9 to it 12 f3 0l Tl 0l R ( X l@ [Z l@ lZ 13 19 20

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CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS 27 failure of the motor on the I I i i o I l The cause of the occurrence was attributed to a comoonent liliilou=o. These motors have been drawine excessive current and failine at the hi2h ambienti I

i,i2j l temperature. The motor was reolaced on the cost-accident radiation monitor RE 5030.

I g l Facility Change Reouests have been issued to reouest an engineering evaluation of I

1 6 41 l orablems on radiation monitors. 80 7 8 9 RY OtSCoVERY QESCRiPTTON A 4PCWER oTHER STATUS 1 5099.05 l I

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Tom Seeler/ Sue KM*ach PHCNE:

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• DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-78-105 DATE OF EVENT: August 9, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Post Accident Radiation Monitor RE 5030 Declared Inoperable on August 9,1978 Conditions Prior to Occurrence: The unit was in Mode 1, with Power (W T) = 1083, and Load (MWE) = 343 Description of Occurrence: At 0245 hours0.00284 days <br />0.0681 hours <br />4.050926e-4 weeks <br />9.32225e-5 months <br /> cu August 9, 1978, while perfor=ing Sur-veillance Test ST 5099.05, "Shif t Channel Check of the Radiation Monitoring System",

operations personnel discovered that the pump for RE 5030 was inoperable. This placed the unit in the action statement of Technical Specification 3.3.3.6 which requires the post accident monitoring instrumentation channels to be operable while the unit is in Modes 1, 2 or 3. This action str.tement requires the inoperable in-strument to be restored within 30 days or the unit must be placed in Hot Shutdown s within the next twelve hours.

Designation of Annarent Cause of Occurrence: The cause of the occurrence on August 9 was attributed to a component failure of the motor en the pu=p. These motors have been drawing excessive current and failing at the high ambient temperature.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. This instrument does not control any equipnent but is used for monitoring purposes only. No other systems were affected by this occurrence.

No incident requiring use of this instrumentation occurred during the ti=e the monitor was inoperable. The other containment post-accidant radiation =onitor, RE 5029 was operable during the period that RE 5030 was inoperable.

Corrective Action: Under Maintenance Work Order 78-2006, the otor was replaced on the post-accident radiation monitor RE 5030. On August 11, 1978, at 2350 hours0.0272 days <br />0.653 hours <br />0.00389 weeks <br />8.94175e-4 months <br />, Surveillance Test ST 5032.01, " Radiation Monitor Functional Test" was completed, and the post-accident radiation monitor declared operable, re=oving the unit from the action statement of Technical Specification 3.3.3.6.

Facility Change Request 78-384 has been issued to request an engineering evaluation of motor related problems on radiation monitors. Facility Change Recuest 73-299 which requestad that a cooling system for RE 5030 and RE 5029 be installed, was also preoared.

i LER #78-089

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i TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION PAGE 2 0F 2 SUPPLEMENTAL I'IFORMATION FOR LER NP-33-78-105 Failure Data: Previous failures of post-accident radiation monitor pumps and motors have been reported in Licensee Event Reports NP-33-78-30, NP-33-78-45, NP-33-78-91 and NP-33-78-101.

LER #78-089 s

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