ML19309A980

LER 80-005/03L-0:on 800303,while Performing LPCI & Containment Cooling Modes of Rhrs Logic test,5-s Delay Timer 10A-M2A for 1002B RHR Pump Failed to Actuate Relay K21A.Relay Failed to Energize.Caused by Microswitch Drift

ML19309A980
Person / Time
Site:	Quad Cities
Issue date:	03/24/1980
From:	Hafera T COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19309A971	List: ML19309A970 ML19309A980
References
LER-80-005-03L-02, LER-80-5-3L-2, NUDOCS 8004020445
Download: ML19309A980 (2)

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I 8 61 R EVENT DEScalPTION AND PROBABLE CONSEQUENCES h 10121l While performing the LPCI and Containment Cooling Modes of RHRS Logic Test, procedure l l0#3[l QMS 700-2, the 5 second delay timer for the 1002B RHR pump, timer 10A-M2A failed to l l 014 l l actuate relay K21A and the relay failed to energize. The three remaining timers in l 10IslI the one-out-of-two-twice logic circuit tested satisfactorily. Subsequently the l IT Tii1 I logic circuit would have operated as designed and started the 10028 RHR pump in the l

@l required 5 seconds. Testing was being done in accordance with Technical Specification l i O is i l 4.5.A.3 l 7 8 9 so E CODE S 8C E COMPONENT CODE SUSCODE SU E 7

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36 l0l0l0l0l 31 40-lY lg l Ylg {g 44 42 4J lH l1 l2 l O gg 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li l0 l l The micro-switch on the timer had drifted from its initial adjustment preventing the i gl timer from actuating the relay properly. The micro-switch was adjusted and the i i

gl timer was retested satisfactorily, actuating the relay after the 5 second time r

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l. .LER NUMBER: R0.80-05/03L-0

.11. LICENSEE NAME: . Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Unit Two IV. DOCKET NUMBER: 050-265 V. EVENT DESCRIPTION:

On March 3,1980, while performing the' LPCI and Containment Cooling Modes of RHRS Logic Test, procedure QMS 700-2, timer 10A-M2A failed. to actuate relay K21 A and the relay failed to energize. The-10A-M2A timer is used to delay the starting of the 10028 RHR pump. The three remaining timers in the one-out-of-two-twice logic circuit were tested satisfactorily.

The-testing of the LPCI and Containment Cooling modes of the RHR system were being performed in accordance with Technical Specification 4.5.A.3 VI. PROBABLE CONSQUENCES OF THE OCCURRENCE:

The starting of the. pump is delayed to prevent' Diesel Generator overload. Because the timers are connected i.' a one-out-of-two-twice logic circuit, and the 10A-M4A timer operated properly, the logic circuit would have operated as designed and started the 1002B RHR Pump in the required 5 seconds.

Plant safety was not affected.

Vll. CAUSE:

The cause of this occurrence is designated as equipment failure.

The micro-switch on the timer had drifted from its initial adjustment, preventing the timer f rom actuating the relay properly. The timer unit is manufactured by Hayden Manufacturing Company.

Vill. CORRECTIVE ACTION:

The micro switch on the timer was readjusted to allow the timer to work properly. The timer was retested and was found to actuate the relay af ter the 5 second time delay as designed.

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