ML20028B096

LER 82-045/01T-0:on 821109,during Normal Operation,Diesel Generator D-3 Tripped on Low Cooling Water Pressure.Caused by Bad Low Cooling Water Pressure Switch.Switch Replaced

ML20028B096
Person / Time
Site:	Dresden
Issue date:	11/18/1982
From:	Rhee S COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028B087	List: ML20028B086 ML20028B096
References
LER-82-045-01T, LER-82-45-1T, NUDOCS 8211290452
Download: ML20028B096 (2)

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U.S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT

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l@ (PLEAss PRINT OR TYPE ALL REQUIRED INPORMATION)

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60 63 COCKET NUMSER 64 69 - 74 EVENT OATE 75 REPORT DATE 40 EVENT DEScalPTION ANO PROBA8LE CONSEQUENCES h 10l2l l During normal operation, as a result of the U-2/3 D/G being declared inoperable, the l

[TTT] l Unit 3 D/G surveillance was performed. At 0445 hours0.00515 days <br />0.124 hours <br />7.357804e-4 weeks <br />1.693225e-4 months <br />, the D-3 D/G tripped on low l

[6TTl l cooling water pressure and was declared inoperable. At 0515 hours0.00596 days <br />0.143 hours <br />8.515212e-4 weeks <br />1.959575e-4 months <br />, a GSEP Unusual l ITTTl i1; vent was declared and an orderly unit shutdown was initiated per Tech. Spec. 3.5.F.1. [

10 Is l l Event was of minimal safety significance since the normal power supply was continuous ;

[0"TT1 5 Ily available. Previous similar event was reported by R.O. 81-46/03L on Docket //50-237.[

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l o l l The cause of this event was due to bad Low Cooling Water Pressure Switch. The switch,;

fi T"O l class 9012 type ACW SS48. was replaced with class 9012 type GAW-5 and Unit 3 D/G l g,,2, lsuccessfully tested at 1751 hours0.0203 days <br />0.486 hours <br />0.0029 weeks <br />6.662555e-4 months <br /> on 11/12/82. The Unit 3 D/G declared operable prior; l,13l l to the seven day requirement in'the Tech. Spec. The monthly surveillance will con- l g l tinue to be performed per DOS 6600-1. I 7 s 9 so ST  % POWER OTHER STATUS OIS O RY OtSCOVERY DESCRIPTION g l E l@ l 0 l 9 l 8 l@l N/A l lB l@l Diesel Surveillance l A VITY CO TENT KELEASE AMOUNT OF ACTIVITY .

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e ATTACHMENT TO LICENSEE EVENT REPORT 82-45/0lT-0 COMMONWEALTH EDISON COMPANY (CNE)

DRESDEN UNIT 3 (ILDRS-3)

DOCKET # 050-249 On 11/9/82 at 0320, the D-2/3 Diesel Generator (D/G) trouble alarm annunciated in the control room. Inspection by the operator and foreman deter '_n:.e ciiat the main lubrication oil circulation pump had tripped. ,

Attempts to reset the lubrication oil circulation pump breaker failed. .

U-2/3 D/G was declared inoperable and required ECCS surveillances were immediately initiated on both D2 and D3. At 0445 hours0.00515 days <br />0.124 hours <br />7.357804e-4 weeks <br />1.693225e-4 months <br />, the D3 D/G was initially reported as to have tripped on Hi Crankcase Pressure and declared inoperable. Since both D/G's were inoperable, at 0515 hours0.00596 days <br />0.143 hours <br />8.515212e-4 weeks <br />1.959575e-4 months <br />, a GSEP Unusual Event was declared and U-3 commenced shutting down per Tech.

Spec. 3.5.F.1. The effect on public safety was minimal since the normal power supplies were available and the 2/3 D/G was out-of-service for less than ten hours.

At 1240 hours0.0144 days <br />0.344 hours <br />0.00205 weeks <br />4.7182e-4 months <br />, the main lubrication oil circulation pump motor on the D-2/3 D/G was replaced and the operability surveillance was success-fully completed. The GSEP Unusual Event and unit shutdown were termina-ted. Further investigation of D-3 D/G revealed the cause to be a bad cooling water pressure switch. The switch was replaced within the seven -

day requirement and the U-3 D/G was returned to service.

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