05000322/LER-1989-003

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LER 89-003-01:on 890310,emergency Diesel Generator (EDG) 102 Manually Shutdown During 18-month Surveillance Test Due to Failure of EDG Output Breaker.Cause Not Determined. Replacement Breaker Installed in Cubicle 102-8
ML20055C507
Person / Time
Site: Shoreham File:Long Island Lighting Company icon.png
Issue date: 05/16/1990
From: Schnaars G
LONG ISLAND LIGHTING CO.
To:
Shared Package
ML20055C491 List:
References
LER-89-003, LER-89-3, NUDOCS 9005240095
Download: ML20055C507 (3)
v • d • e


LER-2089-003,
Event date:
Report date:
3222089003R00 - NRC Website
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" " C' " ' ' CauSE 8v8 TEM COMPONENT C- R ORiAgl pp CJ.U$ t Sv$7tM COMPONENT TO PR 5 Mf l I l 1 1 1 1 I i 1 l l l l l l l l l l 1 I I I I I I I SUPPLEMENT AL REPORT t kPECTED 1141 MONTH Day vtAR SU9uis$ ION vit II9 res eenvete LJr9tCTIO Sv0 Acts 5 ION DA tt! No l l l Aut i. ACT a -, ,, mo .,e<e.. , e . ,,...,,,,,e, ,,nes. ..,, < e ... ne ..,o n e i On March 10, 1989 at 2104, Emergency Diesel Generator (EDG) 102 was manually shutdown during an 18 month surveillance test due to the failure of the EDG output breaker (1R43-ACB-102-8) to close.

EDG 102 had just completed its 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> run to satisfy Tech. Spec.

requirement 4.8.1.1.2.8. The next step of the procedure required.a hot-restart of the engine within 5 minutes S Bus 102 was

.deenergized, starting EDG 102. The engine satisfactorily achieved its required frequency and voltage, but the output breaker did not close as' expected. Additional attempts to close the breaker were unsuccessful. The EDG was shut down approximately 2 minutes and 43 seconds after the engine was started. An immediate investigation ensued to determine the cause for the failure of the breaker to close. Operators inspected the cubicle where the breaker (102-8) was located. No unusual conditions were found. The breaker was removed from service and inspected and tested with acceptable results. The diesel test was performed three more times with a replacement breaker, without incident. EDG 102 was returned to service. A multi-disciplined review was conducted to determine the root cause of the failure of the breaker to close after receiving an EDG start signal.

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-This is a Supplemental.to a Special Report submitted pursuant to l Technical Specification 6.9.2 to comply with Technical Specification 4.8.1.1.3.

.On March 10, 1989 at 2104, Emergency Diesel Generator (EDG) 102 was

- manually shutdown during an 18 month surveillance test due to the failure of the EDG' output breaker (1R43-ACB-102-B)-to close.

Operators had just completed a portion of SP 24.307.02 (TDI DG Emergency AC Power Load Sequencing Tests) to satisfy Tech. Spec.

requirement =4.8.1.1.2.8 (24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> EDG run) for EDG 102. The next, step of the procedure required a hot-restart of the engine within 5

- minutes. The RSST breaker was placed in " Pull to Lock". Then the NSST breaker was placed in " Pull to Lock" deenergizing Bus 102. The.

engine started and satisfactorily achieved its required generator

. frequency and voltage, but the. output breaker did not close as-expected.

,^ .At;this-time, it was observed that the green indicator light (for breaker position and control. power availability) had dimmed for a moment and then returned to its normal brightness. The red light 6 (closed indication) did not come on. The Watch Engineer instructed

$ l me NASO (Nuclear Assistant Station Operator) to give the engine

d h n+,ther start signal. The output breaker would not close. He then f I c Aiccessfully attempted to manually close the breaker in the.

) Control' Room. The EDG was shut down approximately 2 minutes-and 43

{ m onds after the engine had started. An immediate. investigation j onsued to determine the cause for the fallure of the breaker to close.

OperatorsweredispatchedtotheEmkrgencySwitchgearRoom102

'(Control. Bldg. Elev. 25') to check the cubicle 102-8 relays (where the 4KV EDG. Output Breaker 102-8 is located) for trips and targets.

S None were found. The cubicle door was opened and no unusual conditions.wpre found. The'4KV Breaker was open, the aprings were charged and the' fuse holders were in place. The NSST and RSST

supply cubicle relays were checked for trips and targets and none Jwere found. At this time, the operators placed the 4KV 102 bus back into service.

The following morning a visual inspection of the 102-8 breaker was Performed. No abnormal conditions were found. The breaker was cycled 6 times, with satisfactory results. In addition, a voltage was applied to the closing coil and the breaker closed at 50 V DC.

. Resistance readings were taken across the fuses in the circuit with acceptable results. The fuse holder tabs were inspected identifying no abnormal conditions. The tabs were cleaned and regreased with conductive greasc.

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[6fwasrepeated.x,f1notherbreakerwasinstalledincubicle102-8 f The output breaker closed without incident. The test be ;was succerd ully performed two more times. EDG 102 was returned to cervice'on March 11, 1989 at 2150.

e 'A Aulti-disciplined review was conducted to determine the root cau'se of the failure of the breaker to close after receiving an EDG start  :

aignal. This involved reviewing the plant process computer logs, y plant-personnel statements, Control Room logs and associated electrical circuit-diagrams. However, a definitive cause could not be determined.

Further investigation to. determine the root-cause of the failure of the breaker to close has been deferred indefinitely due to the New '

York State - LILCO Shoreham Settlement Agreement.

The following provides the information required by Regulatory

-Position C 3 b of Regulatory Guide 1.108;

1) -The unit involved was Emergency Diesel Generator 102.
2) This test failure is the first valid test failure in the past 100 y EDG. tests.  ;
3) .The cause of the failure could not be determined.
4) The EDG breaker was replaced with a spare.

L 5) EDG 102.was unavailable for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and 46 minutes.

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6) The current surveillance test interval is monthly.

-7 ) . -The current monthly test interval conforms to the schedule of Regulatory Position C.2.d of Regulatory Guide 1.108.

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