ML19341C975

LER 81-009/03L-0:on 810203,diesel Generator 3C Failed to Stop within Appropriate Time.Diesel Shut Down & on Attempted Restart Failed Two Out of Three Times.Failure to Stop Caused by Relay Failure.Cause of Inoperability Unknown

ML19341C975
Person / Time
Site:	Browns Ferry
Issue date:	02/27/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19341C974	List: 05000296/LER-1981-009, Forwards LER 81-009/03L-0 05000296/LER-1981-009-03, /03L-0:on 810203,diesel Generator 3C Failed to Stop within Appropriate Time.Diesel Shut Down & on Attempted Restart Failed Two Out of Three Times.Failure to Stop Caused by Relay Failure.Cause of Inoperability Unknown
References
LER-81-009-03L-01, LER-81-9-3L-1, NUDOCS 8103040643
Download: ML19341C975 (2)

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1. 4 to 61 OOCKET NVMSER Evf NT DESCn.PTION AND PROSA8LE CONSEQUENCES h l D'tring nornal operation. while verfoming SI h.c.A.1 surelement A. D/G '4C fail-1 to l

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1 O I 31 l stop within appropriate time frame during nomal diesel shutdown. Diesel was shut-f7TTl i down manually isolating the fuel. On attemeted restart the diesel failed to start on 1 4

l o I s l I two of three attempts. The diesel generator was then declared inoverable. Other l I O is I l equiment recuired by tech. stecs. was overable. I!o significant resulting events. Nel I o i il 1 dan.7er to health or safety of public. Uo erevious events.

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l i l o l ] Investigation by elect. main, revealed nothing that would have prevented D/G from l Iil l l starting. Do starting problems were experienced during investigation. Since event I rTT 1 l D/G has been successfully tested for operability several times. SI program and l Ib g l bimonthly redtuxiant start testing should identify any starting problems. l t i i i t I recurrence control is required. l 80

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Tennessee Valley Authority Form BF-17 Browns Ferry Nudear Plant BF 15.2

- 1/10/79 LER SUPPLEMENTAL INFORMATION B FRO 2c6 /_81000 Technical Specification involved 3.9.3.2 Reported Under Technical Specification 6.7.2.b. (2)

Date of Occurrence 2/7/61 Time of Occurrence ch22 __ Unit 3 Identification and Description of Occurrence:

During a nomal diesel shutdown. D/G 3C failed to stop within the appropriate time frame. The diesel was shutdown by =anually isolatin6 the fuel. On atte=pted restart the diesel failed to start on two out of three attempts. The diesel generator was then declared inoperable.

Conditions ' Prior to Occurrence: ,

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Action specified in the Technical Specificaticn Surveillance Requirements met due to inocerable equipment. Describe.

Equipment required by tech specs wa's operable, Appa_ rent Cause of Occurrence:

Investigation by electrical maintenance personnel did not reveal anything .that would have e

prevented the D/G from starting. Ihe reason the D/G failed to stop was failure or A!ECR (engine control relay). Also the seal-in contact for STLDI (start lockout relay for start circuit 1) was ' chattering. Ileither of these relsys separately or together would have pre-vented the D/G frem starting or made the D/G inoperable. The STLDI problem would have Analysis of Occurrence: trasuited in atte-mts to start beyond the coreal three attempts.

There was no damage to plant equipment. There was no activity release, no personnel exposure or injury and no danger to the health or safety of the public.

- Corrective Action: Th'c ECR AIO STLDI relays were replaced. portions of the redundant start test were satisfactoril'; performed. D/C operability was verified by performance of SIh.9.A.1 supplement A. IIo problems with starting were experienced during investigation by electrical maintenance pers,nnel. Tio recurrence control is required. *he present .-onthly SI program and hi-enthl: remindant start testing should identify any problems with D/G starting. Since f.hc event the 3/r has tested for operability several times. The next scheduled redundant

! Failure Data: start test is for the period Feb. 23 through " arch 6. This should serve as an adecuate follow up on any start problems.

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• Retention : Period - Lifetime; Responsibility - Administrative Supervisor

• Revision: s f

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