ML20003B243

Forwards LER 81-005/03L-0

ML20003B243
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
ML20003B244	List: ML20003B243 ML20003B255
References
P-81036, NUDOCS 8102100545
Download: ML20003B243 (3)

Text

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public service company oe cdonda 16805 ROAD 1E%

PLATTEVILLE, COLOR ADO 80651 February 3, 1981 For t S t. Vrain Unit No.1 P-81036 Mr. Karl V. Seyfrit, Director Nuclear Regulato:cf Commission 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 .leport No. 50-267/

81-005, Final, submitted per the requirements of Techn'. cal Specification SC 7. 5.2(b)1 and AC 7. 5.2 (b)2.

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/81-005.

Very truly yours, W

Don Warembourg l

i Mauager, Nuclear Production r

i DW/cis Enclosure cc: Director, MIPC

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81021006Y g

REPORT DATE: Februarv 3, 1981 REPORTABLE OCCURREICE S1-005 ISSUE O OCCURRENCE DATE: Januarv 7, 1981 Page 1 of 2 ,

FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 191/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/ 81-005 /03-L-0 Final IDENTIFICATION OF OCCURRENCE:

One of three channels of the loss of circulator bearing water of one of four circulators was found with the setpoint below the limit specified in LCO 4.4.1.

This event is reportabic per Fort St. Vrain Technical Specification AC 7.5.2(b)1 and AC 7. 5.2 (b)2.

EVENT 5ESCRIPTION:

During performance of a scheduled Surveillance Test, one of three pressure differential indicating switches per circulator which measure 'clium circu-lator bearing cavity differential pressure, was found to have a setpoint below the limit specified in LCO 4.4.1, Table 4.4-3. The reactor was in a I

shutdown condition at the time. The LCO specifies a trip setting of equal to or greater than 475 PSID and PDIS-21177 was found to have a trip setting 4

of 380 PSID. The LCO 4.4.1 requires that an inoperable channel be tripped, and since it cannot be established when the channel became inoperable, oper-atton in a degraded mode of the LCO must be assumed.

The switch setting which was found to be less conservative than that es-tablished in the Technical Specification did not prevent fulfillment of the functional requirement of the systes.

. CAUSE DESCRIPTION:

The cause of the below limit setpoint was irstrument drif t. During per-formance of this surveillance, twelve eritches were checked and three were found to have setpoints which had shif ted. Only one was found to have l shif ted below the Technical Specification limit.

CORRECTIVE ACTION:

l The PDIS wa's adjusted to a trip setting above 475 PSID and returned to ser-vice, and the Surveiliance Test was successfully completed.

No additional action is required or anticipated.

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REPORTABLE OCCURRENCE 81-005 ISSUE O Page 2 of 2 Prepared By: dt C sJ4.e vi 44.

Richard R. Frost Technical Services Technician Reviewed By: ,

. W. Gahm Technical Seriices Super /isor Reviewed By:

D Frank M. Mathie Operations Manager Approved By: _ m_ Yh%[W Dcn Warembourg 9 i Manager, Nuclear Production i

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