ML19326A142

LER 78-011/03L-0:on 780116,during Surveillance Test,Decay Heat Pump 1-1 Failed to Start.Caused by Fuses in Breaker for Decay Heat Motor Failing to Make Proper Contact.Control Power Fuese Pulled & Reinserted.Pump Returned to Svc

ML19326A142
Person / Time
Site:	Davis Besse
Issue date:	02/09/1978
From:	Beeler T TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A139	List: ML19326A138 ML19326A142
References
LER-78-011-03L, LER-78-11-3L, NUDOCS 8002030019
Download: ML19326A142 (2)

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1012l l At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on 1/16/73, when performing Surveillance Test ST 5051.01. "Emercancv I

lo la11 Core Cooling System Subsystems Monthly Test". Decay Heat Pump 1-1 failed to start. f l

t o 14 l l This placed the unit in the Action Statement of Tech Spec 3.5.2 which requires twe iol5l l operable Decay Heat / Low Pressure Injection Pumps in Modes 1, 2 and 3. There was no I l o is I l danger to the health and safety of the public or to unit eersonnel. Decav Heat Pomo l l0{7l l l-2 was operabl6. Reactor pcwer was Icss than 1% of full cover. ( NP -3 3 13 ) I l

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43 44 47 JJ cAust oc::RiPTION Ar.0 GCARECTl'/ti ACTIONS h 11 !OIl The fuses in the breaker for the Decov Heat Punn 1 -1 ntor which 'ummiv m n rol w I

[1 ii; Leo the cicse (start) circuit were not making proper contact. At 1008 hours0.0117 days <br />0.28 hours <br />0.00167 weeks <br />3.83544e-4 months <br /> on 1/16/78; fuse black

,, ; ,, j the control power fuses were pulled and then re-inserted into the 9 g ,,; l which rattirned Decay Hnat Pump l-l to service. ::ainLenance Work Order 78-193 has l g,,,,j l been issued to inspect fuses and fuse blocks to aesure proper contact. dQ 1 & ) "ETHOcc7 r act u Tv DISCOVERY CESCniPitON .

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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATI05 FOR LER NP-33-78-13 -

DATE OF EVENT: January 16, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATI0N'0F OCCURRENCE: Decay Heat Pump 1-1-failed to start.

Conditions Prior to Occurrence: The unit was in Mode 2, with Power (MWT) = 0, and Load DME) = 0.

' Description of Occurrence: At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on January 16, 1978 when performing Sur-veillance. Test ST 3051.01, " Emergency Core Cooling System (ECCS) Subsystems Monthly -

Test", Decay Heat Pump 1-1 failed to start. This placed the unit in the Action Statement of Technical Specification 3.5.2 which requires two operable Decay Heat /

Low Pressure Injection Pumps in Modes 1, 2 and 3.

Designation of Apparent Cause of Occurrence: The fuses in the breaker for the Decay i h Heat Pump 1-l motor which supply control power to the close (start) circuit were

/ not making proper contact. The exact reason for the fuses not making proper contact ts not known at present.

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Analysis of Occurrence: Therc was no danger to the health and safety of the public or to unit personnel. Decay Heat Pump 1-2 was operable. Reactor power was less ** ~

than 1% of full power.

Corrective Action: At 1008 hours0.0117 days <br />0.28 hours <br />0.00167 weeks <br />3.83544e-4 months <br /> on January 16, 1978, the control power fuses were pulled.and then re-inserted into the fuse block. The Surveillance Test was success-fully completed which returned Decay Heat Pu=p 1-1 to service. This removed the unit from the Action Statement of Technical Specification 3.5.2. Maintenance Work 1

Order 78-193 has been issued to inspect fuses and fuse blocks to assuru proper contact.

Failure Data: No previous _similar events have occurred.

LER #78-011

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