ML19345E913

LER 80-039/03L-0:on 801230,valve MO-2-1001-34A on RHR Loop a Failed to Open from Control Room.Caused by Corroded Electrical Contacts on Auxiliary Contacter in Valve Breaker. Contacts Replaced

ML19345E913
Person / Time
Site:	Quad Cities
Issue date:	01/22/1981
From:	Steffes C COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19345E909	List: ML19345E908 ML19345E913
References
LER-80-039-03L-02, LER-80-39-3L-2, NUDOCS 8102060399
Download: ML19345E913 (2)

Text

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REPORT DATE 80 7 8 60 61 OOCKET NUMSER 68 EV ENT DATE EVENT DESCRIPTION AND PROB A8LE CONSEQUENCES h l o 121 l At 08h0 while attemptino to transfer water from the Suppression Chamber to the main I

to lai ] condenser hotwell using the "A" RHR loop, valve MO-2-1001-34A failed to open from l 10141 l the Control Room. The B loop of RHR was demonstrated operable and surveillance was [

Inj5!' started to demonstrate adequate core cooling capability in accordance with l l j is I ! Technical Specification 3.5.B. The A loop of RHR containment cooling was operable

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41 Lv_lO I43 N Ih l44G l 0 l 8 l 0 47 lh JJ 35 31 40 42 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 11IoIl The cause of M0-2-1001-34A not opening was corroded electrical contacts on the I li l 31 l auxiliary contactor in the valve breaker. The contacts were replaced and I

, 7 l MO-2-1001-34A was operated three times satisfactorily. l I

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NAME OF PAEPARER 9102060 D . - . ._. .. - _ , . .

l. LER NUMBER: LER/R0 80-39/03L-0

11. LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Di. '

• I wo IV. DOCKET NUMBER: 050-265 V. EVENT DESCRIPTION:

On December 30,1980, at 0840 hours0.00972 days <br />0.233 hours <br />0.00139 weeks <br />3.1962e-4 months <br />, tne Control Room operator began to transfer water from the suppression pool to the main condenser hotwell via the condensate demineralizers per pracedure QOP 1000-10, using the A loop of the containment cooling mode of the RHR System. Motor operated valve M0-2-1001-34A in the A loop of the RHR System would not open f rom the Control Room. At 0845 hours0.00978 days <br />0.235 hours <br />0.0014 weeks <br />3.215225e-4 months <br />, the operator transferred suppression chamber water to the main condenser hotwell via the condensate deminer-alizers using the redundant B loop of the RHR System until 0905 hours0.0105 days <br />0.251 hours <br />0.0015 weeks <br />3.443525e-4 months <br />.

Per Technical Specification 3.5.B., verification of Core Spray valve operability was started to demonstrate the availability of adequate emergency cooling capability. At 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />, after corrective maintenance was performed, MO-2-1001-34A was tested satisfactorily three times and containment cooling A loop of the RHR System was returned to service.

The Core Spray valve operability testing was then terminated.

VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The containment cooling mode of the RHR System is provided to remove heat energy f rom the containment in the event of a loss-of-coolent accident.

The containment cooling mode of the RHR System consists of two loops.

Loss of one loop of the containment cooling mode of the RHR System leaves one remaining system to perform the containment cooling function. The operable loop was demonstrated to be operable immediately. In addition, valve M0-2-1001-34A in the A loop could have been opened manually, if necessary. Thus, there were no safety implications related to this occurrence.

Vll. CAUSE:

The cause of valve MO-2-1001-34A not opening from the Control Room was corroded electrical contacts in the auxiliary interlock contactor located in MCC 28-1B. The interlock contactor prevents the operator from reversing the motor direction when it is running to protect the electric motor.

Vill. CORRECTIVE ACTION:

The faulty contact was replaced with General Electric contact kit 500E17 The valve was operated three times successfully, and the A loop of the RHR System was returned to ' service at 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br /> on December 30, 1980.