ML19338G160

Forwards LER 80-053/03L-0

ML19338G160
Person / Time
Site:	Fort Saint Vrain
Issue date:	10/24/1980
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19338G161	List: ML19338G160 ML19338G199
References
P-80377, NUDOCS 8010280527
Download: ML19338G160 (5)

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Public Service Company 2 Odomde 16805 ROAD 19%

. ._ . . ! PLATTEVILLE, COLOR ADO 80651 October 24, 1980 Fort St. Vrain Unit No. 1 P-80377 Mr. Karl V. Seyf rit, Director Nuclear Regulatory Cornission Region IV .

Office of Inspection and Enforcement 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012 Ref erence: Facility Operating License No. DPR-34 Docket No. 50-267

Dear Mr. Seyfrit:

Enclosed please find a copy of Reportable Occurrence Report No. 50-267/

80-53, Final, submitted per the requirements of Technical Specification AC 7.5.2(b)2.

l Also, please find enclosed one copy of the Licensee Event Report for '

Reportable Occurrence Report No. 50-267/80-55.

Very truly yours, Yus.s Don 'Jarembourg 9 Manager, Nuclear Produc. tion D'4/cis Enclosure cc: Director, MIFC Doo3 g

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REPORT DATE: October 24. 1980 REPORTABLE OCCURRENCE 80-53 ,

ISSUE O

, OCCURRENCE DATE: September' 26, 1980 Page 1 of 4

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FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WE1D COUNTY ROAD 191/2 PLAITEVILLE, COLORADO 80651 i

REPORT NO. 50-267/80-53/03-L-0 Final IDENTIFICATION OF

• OCCURRENCE:

During performance of the scheduled loss of outside power and turbine trip surveillance test, the automatic 13 load progracnning sequence did not oper-

• ate. This is reportable as a degraded mode of LCO 4.6.1.d)3 per Fort St.

Vrain Technical Specification AC 7.5.2(b)2.

EVENT DESQtIpTION:

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On September 26,- 1980, during a maintenance shutdown period, the semi-annual

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test of the standby diesel generators was conducted. The test verifies the automatic de-energization and load shedding f rem the essential 480V busses.

It also verifies that the standby diesel generstors start from ambient con-ditions on the auto-start signal and energizes the auto-connected (programmed) loads through the load sequencer. Refer to Figure 1. *he sequent al load programming is handled by two parallel programmers lA t and 13 2 . Th ese are independent of each other and if. one does not operate, the other one will

, energize the required equipment. The 13 program was scheduled for test but i did not start; therefore, the 1A program automatically took over and started

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to carry out the required actions as designed. Since the 13 program was to be tested, the test conductors terminated the test' at that point. Had an-

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actual loss of outside power and turbine trip occurred, automatic load j sequencing would have been completed on the 1A program.

, Electrical maintenance personnel examin :4 the 13 program Aquipment and found relay 286G13 had a wire interfering with contact 12/12C U3 . This pre-vented e initiation of the 13 program, but did not interfere with contact 11/ llc which started the la program.

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. N REPORTABLE OCCURRENCE 80-53 ISSUE C Page 2 of 4

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CAUSE DESCRIPTION:

Failure of the LB program to operate was due to a wire blocking the 12/12C contact of the 286G13 relay. . The wire had been inadvertently repositioned by being pulled somewhere along its length. This moved the wire into such a position that the 12/12C contact was blocked frca closing. The reason for the laterference of the wire and the relay is not determinable.

CORRECTIVE ACTION:

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1. The wire was repositioned such that it no longer interfered with relcy operation.

2. The other wires on relay 286G13 and on the unaffected relay 286G1A were examined to insure there was no other interference.

3. The surveillance test was satisfactorily completed.

4. Electrical naintenance personnel have been informed of tae situ-ation and instructed to be cautious while performing their work.

No further corrective action is anticipated or required.

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REPORTABLE OCCURRENCE 80-53 ISSUE O Page 4 of 4 Prepared By:

Asa B. Reed /

Technical Services Technician

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Reviewed By: -

. g Gahm Technical Services Supervisor Reviewed By: / )'2'l-f b.bh Frank M. Mathie Operations Manager Approved By: '

7)Tw Don Wareebourg V Manager, Nuclear Production

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