05000267/LER-1982-047, Forwards LER 82-047/03L-0.Detailed Event Analysis Encl

Forwards LER 82-047/03L-0.Detailed Event Analysis Encl

ML20064K174
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/29/1982
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20064K177	List: 05000267/LER-1982-047, Forwards LER 82-047/03L-0.Detailed Event Analysis Encl
References
P-82560, NUDOCS 8301180320
Download: ML20064K174 (5)

LER-2082-047, Forwards LER 82-047/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2672082047R00 - NRC Website

text

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C  ;'s ANl d 16805 Road 19 1/2, Platteville, Colorado 80651-9298 December 29, 1982 Fort St. Vrain Unit No. 1 P-82560 Mr. John T. Collins, Regional Administrator Region IV Nuclear Regulatory Commission 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011

Reference:

Facility Operating License No. DPR-34 Docket No. 50-267

Dear Mr. Collins:

Enclosed please find a copy of Reportable Occurrence Report No. 50-267/82-047, Final, submitted per the requirements of Technical Specification AC 7.5.2(b)1.

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/82-047.

Very truly yours, h(~

Don Warembourg Manager, Nuclear Production DW/cls Enclosure cc: Director, MIPC 8301100320 921229 PDR ADOCK 05000 V1l"u h 0

I FIPORTAB1.E OCCI'RFf'IG DISTRIBUTI0t4_

Number of Copies _

1 (P Latter)

Dep a rtmen t o f Ene rgy - - - - - - - - - - - - - - - - - - - - - -

San Francisco Operations Of fice Attas California Patent Group 1333 Broadway Oaitland. California 94612 1 (P Letter)

De p a r tment o f Ene rgy - - - - - - - - - - - - - - - - - - - - -

Mr. Cien A. Newby. Chief HTR Brinch Division of Nuclear Power Development Mail Station B-107 Washin gton. D.C. 20545

- - - - 1 (P 14tter)

Dep artmen t o f Ene rgy Attn Project Manager P. O. Box 8160s San Diego. California 92138 (Original of P Istter)

!!r. John T. Collins. Regional Administrator Region IV Nuclear Ragulatcry Commissim 611 Ryan Plaza Drive Suite 1000 Arlington. Texas 76011 1 (P istter)

Mr. George Kuzmycz - - - - - - - - - - - - - - - - - - - - - - -

Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Marylar d 20034 1 (P Letter)

Director - - - - - - - - - - d Program Control Of fice of Management Information an Nuclear Regulatory Commission Washin6 ton. D.C. 10555 1 (P Letter)

INPO Records Center Suite 1500 110G Circle 75 Parkway Atlanta, a 30339 Mr.

pichard Phelps . FSV. GA Site Rep resentative - - - - - - - - - - - - 1 (P tatter)

Ceneral Atomic Coupany 16864 Wald County Road 191/2 Platteville. Colorado 80651 1 (P Letter)

NRC Resident Site inspector - -- - --- - - --- --- - -

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r REPORT DATE: December 29, 1982 REPORTABLE OCCURRENCE 82-047 ISSUE O OCCURRENCE DATE: December 1, 1982 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 19 1/2 PLATTEVILLE, COLORADO 80651-9298 REPORT NO. 50-267/82-047/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

While performing regularly scheduled surveillance tests on the plant protective system (PPS), a portion of the "A" logic, " loss of bearing water" circuitry associated with "C" helium circulator (C-2103) was found inoperable.

This constitutes operation in a degraded mode of LC0 4.4.1, Table 4.4-3, and is reportable per Fort St. Vrain Technical Specification AC 7.5.2(o)1.

EVENT DESCRIPTION:

On December 1, 1982, with the reactor operating at less than 2%

thermal power, instrument personnel performed (SR 5.4.1.3.3b-M) the circulator bearing water pressure surveillance test. This surveillanca is a pulse test of the PPS circuitry associated with a loss of helium circulator bearing water pressure.

Upon performing the portion of the test associated with "C" helium circulator, the logic circuitry was found operable to trip the circulator on loss of bearing water but failed to actuate the control relay which would allow accumulator water to be admitted to the circulator bearings. The amount of water available in the accumulator is sufficient to allow circulator coast down after a trip, and therefore, prevent damage to the bearings.

The redundant "B" logic circuitry was found operable in its entirety and would have performed per design.

CAUSE DESCRIPTION:

Component failure.

The "A" logic circuitry failed due to a faulty "ch p" (Z-32) in the CT-2A2 logic module of the PPS.

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REPORTABLE OCCURRENCE 82-047 ISSUE O Page 2 of 3 CORRECTIVE ACTION:

The logic module was removed and temporarily replaced with a spare while the faulty chip was replaced. and the module functionally tested. The repaired module was installed, and the surveillance was successfully completed.

No further corrective action is anticipated or required. -

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REPORTABLE OCCURRENCE 82-047 ISSUE O Page 3 of 3 Prepared By: 31xM .. 1 Duine L. Frye /

Senior Technical Services Technician Reviewed By: b /MMm_/>L Charles Fulfer Technical Services Engineering supervisor Reviewed By: O b'A d Edwin D. Hill Station Manager Approved By: d h(

Don Wa'rembourg Manager, Nuclear Production