ML20064J201

/03L-0 on 781126:during Testing Containment Spray Pumps 51C & 51A Failed to Start on Signal Due to Excess Friction in Circuit Breaker Trip Bar Bearings.Bearings Were Cleaned & Lubricated

ML20064J201
Person / Time
Site:	Oyster Creek
Issue date:	12/22/1978
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:
Shared Package
ML20064J190	List: ML20064J187 ML20064J201
References
LER-78-030-03L, LER-78-30-3L, NUDOCS 7812290219
Download: ML20064J201 (3)

Text

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LICENSEE EVENT REPORT T ACL BLOCO l l l l l l PLEASE PRINT oR VYPE ALL REQUIRED INFORMATION)

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REPORT DATE 80 7 8 60 61 DOCK ET NUMB E R 68 69 EVENT CATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 1012Il On November 26, 1978, while performinO the Containment sorav svstem auto i lo lal [ actuation test, containment spray oump Sic failed to start on sianal . On I lo !al i subsequent attempts to start the system, SIC started each time. While l

[O !s j l performing the diesel generator auto actuation test on December 2, con- l l 0 is l l tainment spray pump 51A failed to start. In subsequent tests, there were l l 017 ! l pump motor power circuit breakers. l lOl8l l l 80 7 8 9 SYSTEM CAUSE CAUSE COYP. VALVE CODE COOE SUBCOOE COMPONENT CODE SUSCOCE SU8 CODE

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33 3b 3' 40 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 11 601 i The cause of the failure is attributed to excessive friction in the i li 111 l bearinos for the tric bar in the circuit breakers. The circuit breakers I l i l 21 l for the affected Dumos were disassembled and the trio bar bearinos were I l i 131 I cleaned and lubricated,  !

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f'd *J* / Madison Avenue at Punch Bowl Road M d E 0--*h .di't[:4 Mornstown, New Jer ey 07960 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report '

Reportable Occurrence No. 50-219/78-30/3L-0 Report Date  !

i December 22, 1978  !

Occurrence Date November 26, 1978 ,

Identification of Occurrence l

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Failure of cantainment spray system ll pump 51C to start during a system I automatic actuation test. This event is considered to be a reportable i occurrence as defined in the Technical Specifications, paragraph 6.9.2.b.2.

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Conditions Prior to Occurrence l The plant was in a refueling shutdown.

t i Reactor mode switch in shutdown.

Source range monitors - 30 cps.

All control rods at 00.  !

Reactor water level - 165 inches.  !

Reactor coolant temperature - 160*F.

Description of Occurrence [

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\, On Sunday, November 26, 1978, containment spray system ll pump SIC failed to start when a simulated high drywell pressure was applied to'drywell pressure i sensors. The failure occurred during the performance of the containment  !

l spray system automatic actuation test. On subsequent attempts to stsrt the j

( system, pump SIC started each time. The surveillance test was completed with i no additional discrepancy items. l t On Saturday, December 2, 1978, a similar failure occurred in containment  !

j spray system I when containment spray pump 51 A failed to start during performance  !

i of the diesel generator automatic actuation test. In subsequent tests, there  !

were no further pump breaker failures. Investigation indicates a similar i problem with both pump motor power circuit breakers.  !

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1 L Jersey Central Power & Light Company is a Member of the Genera! Puolic Utilmes System  !

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Reportpble 0ccurrence No. 50-219/78-30/3L-0 Page 2 December 22, 1978 i

Apparent Cause of Occurrence The apparent cause of the failure is attributed to greater than normal f riction in the bearings fcr the trip bar in the circuit breaker for pump SlC.

Analysis of Occurrence The containment spray system is provided to remove heat energy from the containment in the event of a loss-of-coolant accident. The flow f rom one pump in either loop is more than ample to provide the required heat removal capability. The loss of the operation of one of the four containment spray pumps is considered to have minimal safety significance.

Corrective Action The circuit breakrs for the affected containment spray pumps were disassembled and the trip bar bearings were cleaned and lubricated. As part of the j critical corrective action, the outer two (2) trip bar bearings were disassembled /

i inspected and the bar rotated approximately 30' to check for greater than normal friction on the two (2) inner trip bar bearings. This trip bar rotation is limited to 30* by the latch mechanism.

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Based on the preventative maintenance performed on the containment spray breakers during the 1978 outage, we consider the breakers fully operable.

But to preclude the potential for a similar failure, all 460 V. containment spray pump breakers and core spray pump 460 V. breakers will be disassembled  ;

with all four (4) trip bar bearings removed to further insure that no greater than normal friction exist in any trip bar bearings. This will be completed by February i, 1979 Additionally, the scope of the preventative maintenance 4

program concerning these breakers will be amplified to require complete disassembly / inspection of all breaker trip bar bearings.

Failure Data i General Electric '

Low voltage circuit breaker

Type AK-2A-50 1 Frame size 1500 amps No. 20AA1392-214-CC

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