ML20003B121

Forwards LER 81-003/03L-0

ML20003B121
Person / Time
Site:	Fort Saint Vrain
Issue date:	02/03/1981
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20003B122	List: ML20003B121 ML20003B130
References
P-81039, NUDOCS 8102100377
Download: ML20003B121 (3)

Text

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pubue sendee company o? Ccacada 16805 ROAD 19%

PLATTEVILLE COLORADO 80651 February 3, 1981 Fort St. Vrain Unit No. 1 P-81039 Mr. Karl V. Seyfrit, Director Nuclear Regulatory Co::: mission Region IV ,

Office of Inspection and Enforcement 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012

Reference:

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/

81-003, Final, submitted per the requirements of Technical Specification-AC 7.5.2(b)2.

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/81-003.

Very truly yours, d Yh~

Don Warembourg Manager, Nuclear Production W/cls Enclosure cc: Director, MIPC 7k 5 81% 2 0e 3 77

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I REPORT DATE: February 3,1981 REPORTABLE OCCURRENCE 81-003 ISSUE O CCCURRENCE DATE: Januarv 6, 1981 Page 1 of 2 ,

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FCRT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 19 1/2 j PLATTEVILLE, COLO3 ADO 80651 REPORT No. 50-26 7/ 81-003 /03-L-0

! i Final l

IDENTIFICATION OF l OCCURRENCE:

i One of three channels of the circulator drain =alfunction for one circulator '

was found inoperable. This event constitutes operation in a degraded mode l

of LCO 4.4.1. Table 4.4-3 and is reportable per Fort St. Vrain Technical l Specification AC 7.5.2(b)2.

EVENT DESCRIPTION:

i l During performance of a scheduled test to verify plant protective system indicator lamp operability, when the reactor was in a shutdown condition, it was found that the lamps on one channel of 1D helium circulator drain mal-l function (XDIS-21328) would not light. Further invertigation found that if

} a drain malfunction had occurred, the channel would not have tripped. Tech-1 nical Specification LC0 4.4.1 requires that an inoperable channel be tripped.

! Since it cannot be established when this channel became inoperable, operation

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in a degraded mode of LCO 4.4.1 must be assumed.

i e CAUSE l DESCRIPTION:

The cause of the channel inoperability was a blown fuse in ene channel trip .

! circuitry of a model SW-2D switch module. The circuit design is such that

, with this fuse blown, the channel is made inoperable with no indication of its status available to the operator. No reason for the fuse blowing could be found. It was replaced and has remained operable since then.

i CORRECTIVE ACTION:

The blown fuse was replaced anu the channel was returned to service.

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Public Service Company Nuclear Project Department has been requested to evaluate the circuit design to determine the feasibility of providing the operator some indication of a blown fuse in similar modules.

No further action is anticipated or required.

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REPORTA3LE OCCL*RRENCE 81-003 ISSLT 0 Page 2 of 2 4

Prepared By: 'b 4 , AW j Richard R. Fros t Technical Services Technician i

Reviewed By: .

. Gahm chnical Services Supervisor

~n Reviewed By:

Frank M. Mathie Operations Manager

. Approved By: A M ,, , _

_[ m Don Warembourg jf" Manager, Nuclear Productiof i

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