05000346/LER-1978-071-03, /03L-0:on 780618,containment Spray Pump Failed to Start Automatically on Sequence During Surveillance Test. Caused by Module L-412 Failure & Resulting in Failure of Relays to de-energize.Output Module Replaced

/03L-0:on 780618,containment Spray Pump Failed to Start Automatically on Sequence During Surveillance Test. Caused by Module L-412 Failure & Resulting in Failure of Relays to de-energize.Output Module Replaced

ML19329B030
Person / Time
Site:	Davis Besse
Issue date:	07/14/1978
From:	Kovach S TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19329B028	List: 05000346/LER-1978-071, Forwards LER 78-071/03L-0 05000346/LER-1978-071-03, /03L-0:on 780618,containment Spray Pump Failed to Start Automatically on Sequence During Surveillance Test. Caused by Module L-412 Failure & Resulting in Failure of Relays to de-energize.Output Module Replaced
References
LER-78-071-03L, LER-78-71-3L, NUDOCS 8001290742
Download: ML19329B030 (2)

LER-1978-071, /03L-0:on 780618,containment Spray Pump Failed to Start Automatically on Sequence During Surveillance Test. Caused by Module L-412 Failure & Resulting in Failure of Relays to de-energize.Output Module Replaced

Event date:
Report date:
3461978071R03 - NRC Website

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LICENSEE EVENT REPORT

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UCENSEE CODE 14 15 uCENSE NUMBER 10111-Nu'RC l L ]@l 0 l 5 l 0 l - l 0 j 3 l 4 l 6 @l 016 ( 1 l8 ( 7 l 8 )@l 0 l 7 l 1 l 4 l 7 l CON 64 69 EVENT CATE 74 75 REPORT OATE 80 60 61 DOCKET NUMBER I

8 EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h l

I o i 2 l l On June 18,1978, at 1015 hours0.0117 days <br />0.282 hours <br />0.00168 weeks <br />3.862075e-4 months <br /> during surveillance testing, Containnent Sprav (CS) Pump 1-2 failed to start automatically on sequence. The pump was thus inoperablej

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, o g, ; Technical Specification 3.3.2.1 requires the operability of both CS Pumps w There

, Modes 1, 2, 3 and 4.

The unit was in Mode 6 at the time of the occurrence.

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i o is 1 I was no danger to the health and safety of the public or unit personnel.

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o,,,_;CS Pump was operable.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h failure. The failure of a Safetv Featuresl l i 101 IThe cause of this occurrence was a comoonent Tha nne n*

I y l Actuation System output module caused failure of relavs to de-ener&e.

m l module was replaced. CS Pump 1-2 was returned to coerability on June 20, 1978.

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% POWER OTHER STATUS 05 0 ERY OISCOVERY OESCRIPTION l t i 5 l l G l@ I O l 0 l 0 lhl NA l

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8 9 10 419-250-5000, Ext. 230 Susan A. Kovach PHONE:

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.i TOLEDO EDISON COMP 1NY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION

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SUPPLEMENTAL INFORMATION FOR LER NP-33-78-83 I

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DATE'OF EVENT: June 18, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Containment Spray Pump 1-2 inoperable.

Conditions Prior to Occurrence: The unit was in Mode 6, with Power (MWT) = 0, and Load (MWE) = 0.

Description of Occurrence: On June 18,1978 at' 1015 hours0.0117 days <br />0.282 hours <br />0.00168 weeks <br />3.862075e-4 months <br /> during performance of

• Surveillance Test ST 5031.07, " Safety Features Actuation System 18 Month Refuel-ing Test", Cont =4=ent Spray (CS) P :mp 1-2 failed to start automatically on sequence. The pump was thus inoperable.

Technical Specification 3.3.2.1 requires the operability of both CS Pumps while in Modes 1, 2, 3.and 4.

Since the unit was in Mode 6 at the time of the occur-rence, Action Statement 9 was not applicable. This occurrence is being reported as documentation of component failure.

/N

- ' Designation of Apparent Cause of Occurrence: The cause of the occurrence was a component failure. The failure of Safety Features Actuation System (SFAS) output module L-41,2 caused failure of relays to de-energize.

Analysis of Occurrence: There was no danger to the health and safety of the public or unit personnel. One other Containment Spray Pump,1-1, was op'erable during the periods that CS 1-2 was inoperable. The unit was in Mode 6 at the time of the occurrences.

Corrective Action

The output module was replaced under Maintenance Work Order 78-1561. CS Pump 1-2 was returned to operability on June 20, 1978.

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Failure Data: Containment Spray Pump 1-1 was previously reported to have been inoperable due to defective instrumentation in Licensee Event Report NP-33-77-21.

LER #78-071 1

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