ML19309F349

LER 80-003/03T-0:on 800318,during post-mod Testing of Containment Spray Sys,Relay 1CSB Would Not Latch.Caused by Latching Mechanism Misalignment.Latch Adjusted & Proper Operation Verified on 800318.Similar Relay Bench Tested

ML19309F349
Person / Time
Site:	Point Beach
Issue date:	04/16/1980
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19309F347	List: ML19309F346 ML19309F349
References
LER-80-003-03T, LER-80-3-3T, NUDOCS 8004290310
Download: ML19309F349 (2)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o 121 l At 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on 03-18-80 during post-modification testing of the con- I to!3l l tainment spray system, the ICSB relay would not latch. The unit was inl Io l4 l l the cold shutdown condition at the time. The Train "A" relay, 1CSA, l 10181 I was tested and found to be operable. Relay 1CSB activates when con- l l 016 l l tainment pressure reaches 30 psi or two manual pushbuttons are de- l 10l>ll pressed. This event is reportable in accordance with Technical l 10, s i l Spe cification 15. 6. 9. 2. B . l . l 7 8 9 80

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43 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS liloll The relav did not latch due to a misalicnment of the latchina mechanismJ liliJl The relay latch was adiusted and crocer coeration was verified on I i,12i l 0 3-18-80. A similar relay was bench tested and found that the co n- 1 yl tainment spray secuence would start if the relay would pick up but not l

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J ATTACHMENT TO LICENSEE EVENT REPORT 80-003/03T-0

Wisconsin Electric Power Company Point Beach Nuclear Plant Unit 1 Docke t No. 50-266 .

At 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on March 18, 1980, during post-modification testing of the containment spray system, the 1CSB relay would not latch. Unit 1 was in the cold shutdown condition at the time. The Train "A" relay, 1CSA, was immediately tested and found to be operable.

! Relay 1CSB is a Westinghouse MG-6 type relay in the Train "B" high-high containment pressure logic system. The

, relay is actuated on a containment pressure of 30 psi or manually by two pushbuttons.

Testing of a MG-6 relay demonstrated that if contain-ment spray was initiated either in automatic or manual the system would have performed its fu'ction. Bench testing of the similar relay verified that the relay contacts are closed long enough to initiate the containment spray system without a latching mechanism; that is, the reaction time of the relay was sufficient to provide cocplete actuation of the containment spray system.

The relay latching mechanism was adjusted and proper operation was verified on March 18, 1980.

This event is reportable in accordance with Technical Spe cification 15. 6. 9. 2. B .1 1

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