ML20064D824

/03L-0 on 781003:during FNP-1-STP-40.3,the 1C Diesel Generator Output Breaker Failed to Close on 4160V Bus 1H After D/G auto-started,due to Incorrect Landing of Jumper Installed for Unit 1/Unit 2 Separation

ML20064D824
Person / Time
Site:	Farley
Issue date:	11/02/1978
From:	Hairston W ALABAMA POWER CO.
To:
Shared Package
ML20064D802	List: ML20064D798 ML20064D805 ML20064D809 ML20064D817 ML20064D824
References
LER-78-072-03L, LER-78-72-3L, NUDOCS 7811090200
Download: ML20064D824 (3)

Text

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E% ENT DATE 74 75 REPORT DATE 80 7 8 60 61 DOCK ET Nuve ER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h Lo.MJ l on 10/3/78, while performing FNP-1-STP-40.3 (partial) the 1C diesel generator (D/G) l I o l 31 l output breaker failed to close on 4160V bus 1H after the D/G auto-started and came upl

[ o 1. l l to speed. The 1C D/G was declared inoperable at 1015 on 10/3/78, and was returned tol

[olsl l an operable status at 1110 on 10/3/78. T/S 3.8.1.2 requirements were met (one l 1010l l separate independent D/G set operable). The 1C D/G output breaker could have been l o 7 l closed and the D/C loaded manually. The health and safety of the public were not l IoI8Il affected. 80 I

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l1Io11 A jumper installed for Unit 1/ Unit 2 separation was incorrectly landed. The jumper l i i l was correctly positioned and the operability of the IC D/C verified per FNP-1-STP-40.31 1

Iil2l 1 (partial). A review of documentation verified the jumper was initially positioned l q l correctly. This occurrence will be discussed with applicable plant personnel. l 1

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NAVE OF PREP ARER W. G. Hairston, III PHONE:

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O ALABAMA P0b'ER COMPANY JOSEPH M. FARLEY NUCLEAR PLANT DOCKET No. 50-348 ATTACHMENT TO LER 78-072/03L-0 Facility Joseph !!. Farley Unit 1 ,.

Report Date: 11/02/78 I ".

Event Date: 10/03/78 >-.

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. Identification of Event Diesel generator 1C output breaker failed to close on 4160V bus 1H during performance of Surveillance Test Procedure FNP-1-STP-40.3.

Conditions Prior to Event

' The unit was in Mode 5 during a scheduled unit shutdos..

Description of Event On 9/18/78, while performing FNP-1-STP-40.3 to determine the operability of the on-site emergency power system during a safety injection in

'7 conjunction with a loss of off-site power, the 1C diesel generator started and came up to speed in the required time, but did not close on 4160V bus 1H. The reactor operator increased the 1C diesel generator voltage, which was low, and manually closed the 1C diesel generator out-put breaker. It was thought that the failure of the 1C diesel generator output breaker to close was related to the low voltage, and that the operability of the diesel generator was not affected.

A retest of FNP-1-STP-40.3 (partial) was performed on 10/3/78 to verify the ability of the 1C diesel generator to auto-start and pick up the required loads. When bus lH was deenergized, the 1C diesel generator I auto-started, came up to the required speed and voltage, but the output f breaker did not close on the lH bus. The 1C diesel generator was

- declared inoperable at 1015, and a work request was initiated to investi-gate and correct the problem.

' A jumper, initially installed for Unit 1/ Unit 2 separation during the startup test program prior to initial core load was found to be improperly landed. The jumper was correctly positioned and FNP-1-STP-40.3 (partial) was completed satisfactorily for the 1C diesel generator. The 1C diesel generator was returned to an operable status at 1110 on 10/3/73.

Designation of Apparent Cause A jumper installed for Unit 1/ Unit 2 separation was incorrectly landed.

j A review of plant documentation indicated that the jumper was installed correctly when the Temporary Alterations Log was implemented prior to initial core load. The 1C diesel generator auto-started and loaded as required when a loss of off-site power occurred on 9/16/78 (LER 77-012/01T-1).

The 1C diesel generator was also verified to be operable by the loss of off-site power test performed as part of the Phase III test program on e 4 .s m 24 s . . s **.P l

78-072/03L-0 10/2/77 and 10/3/77. A review of maintenance work requests revealed no evidence of the jumper being moved since its initial installation.

No cause could be deternined for the incorrect placement of the jumper.

Analysis of Event The 1C diesel generator could be aligned manually. The loads supplied (river water pumps 8, 9, and 10) would not be required in the early stages of an accident, therefore, operations personnel would have adequate time to close the breaker and manually load the diesel genera-tor. The other redundant diesel generator set was operable. At the time of discovery only one diesel generator set was required to be operable (unit in Mode 5). The health and safety of the general public were not affected by this occurrence.

Effect of Plant This occurrence had no significant effect on plant operation.

Corrective Action The jumper was correctly positioned af ter being discovered incorrectly positioned. The operability of the 1C diesel generator was verified by FSP-1-STP-40.3 (partial) . This incident will be discussed with applicable plant personnel.

Failure Data None.

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