ML20027C538

LER 82-045/03L-0:on 820904,auxiliary Feedwater Pump 1-1, Suction Valve FW786 Observed Closed for No Apparent Reason W/O Operator Touching Close Button.Cause Unknown. Valve Reopened

ML20027C538
Person / Time
Site:	Davis Besse
Issue date:	10/04/1982
From:	Long J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20027C535	List: ML20027C534 ML20027C538
References
LER-82-045-03L, LER-82-45-3L, NUDOCS 8210180137
Download: ML20027C538 (2)

Text

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U. S. NUCLE A'l RE!ttLATORY COMMISSION E LICENSEh.5 VENT REPORT

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o 2 l (NP--33-Ji2-49) On 9/4/82 at 0945 hours0.0109 days <br />0.263 hours <br />0.00156 weeks <br />3.595725e-4 months <br />, a Control Room operator observed Auxiliary I goj y l Feedw ter (AFW) Pump 1-1, suction valve FW786 closed for no apparent reason without l

[n l4 ; lan operator to;iching the close button. The station entered thd action statement of

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,, ,, l Technical Specification 3.7.1.2. There was no danger to the health and safety of the I o n lpublic or ctation personnel. The valve was closed for less than a minute during i e o , lwhich the operator was aware of its position. I l o lH I I l s =o ao

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44 CAUSE OUCRIPTION AND CORRECTIVE ACTIONS h i o l The cutise is unknown. Maiatunance Work Order 82-2334 was performed on 9/28/82 to in- l i i lvesticate the control circuit, liowever, no cause was found as tE, why the valve went I

, 7 l closed. FW786 was immediately reopened, and the applicable portion of ST 5071.04 was l g l performed to prove operability. Since 9/4/82, there have been no further random I gii y l closures of this valve. l r 8 9 80 STA S  % POWER OTHEH STATUS 01 C tY DISCOVEHY DESCHIPTION g W@ l0 l2 l5 l@l NA **

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• pVR82-100 NAME OF PREPARER PHONE:

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, 4 y-t TOLEDO EDISON COMPANY

-DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-82-49

- DATE OF EVENT: September 4, 1982 .

FACILITY: Davis-Besse Unit L

. IDENTIFICATION OF OCCURRENCE: FW786 went closed for no apparent reason Conditions Prior to Occurrence: The unit was in Mode 1 with Power (MWT) = 693 and Load (Gross MWE) = 180

Description of occurrence

On September 4. 1982 at 0945 hours0.0109 days <br />0.263 hours <br />0.00156 weeks <br />3.595725e-4 months <br />, a Control Room operator observed Auxiliary Feedwater Pump (AFP) 1-1 suction valve FW786 go from open to close without an operator touching tha close button. The station entered the action statement of Technical Specification 3.7.1.2. At 0945 hours0.0109 days <br />0.263 hours <br />0.00156 weeks <br />3.595725e-4 months <br />, the valve was reopened by the Control Room operator, and the station was removed l from the action statement.

Designation of Apparent Cause of Occurence: The cause for this spurious occurrence.

is unknown. Maintenance Work Order 82-2334 was performed on September 28, 1982 to thoroughly investigate the control circuit. . however, ru) cause was found as to why the valve went closed. FW 786 is a locked valve; as such its local controller is locked and the manual valve handwheel on the limitorque operator was locked in the open position. This and the fact that the security computer did not show personnel in the room indicates that the valve was not intentionally closed.

Analysis of' Occurrence: There was no danger to the. health and safety of the public--

or station personnel. The valve was closed for less than a minute during which the operator was aware of its position. Auxiliary Feedwater Train 1 could have been L manually restorcJ from the Control Room if required. In addition, Auxiliary Feed-l water Train 2 was operable during the time of the occurrence.

? l f _ Corrective Action: The Control Room operator verified that SW 1382 did not open,

! and the auxiliary feedwater pump troubic alarm did not actuate which indicates it.

was not the low pressure switch interlock causing the closure. FW786 was reopened, l and the applicable portion of Surveillance Test ST 5071.04 was performed to prove operability. Repeated attempts were made to duplicate the initial conditions of the l event without success. Relay checks and electrical inspections under MWO 82-2334 did not reveal subsequent problems.. Since September 4, 1982, there have been no j further random closures of this valve.

l Failure Data: A previous similar occurrence was reported in Licensee Event Report l NP-33-80-33 (80-024) which described the Auxiliary Feed Pump Turbine 1-2 Main Steam Isolation Valve MS-107 randomly closing for no apparent reason.

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