ML19257A709

Forwards LER 79-062/03L-0

ML19257A709
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/28/1979
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19257A710	List: ML19257A709 ML19257A711
References
P-79313, NUDOCS 8001070417
Download: ML19257A709 (4)

Text

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public service company oe cdlease 16805 Weld County Road 191/2, Platteville, Colorado 80651 December 28, 1979 Fort St. Vrain Unit No. 1 P-79313 Mr. Karl V. Seyfrit , Director Nuclear Regulatory Comission 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. 50-267/79-62, Final, subnitted per the requirements of Technical Specifi-cation AC 7.5.2(b)1 and 7.5.2(b)2.

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/79-62.

Very truly yours, MV w 7

Don Warembourg Manager, Nuclear Production DW/cis cc: Director, MIPC 00 k

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l 1693 23I s 001078 4i;g '~f S

REPORT DATE: December 28, 1979 REPORTABLE OCCURRENCE 79-62 ISSUE O OCCURRENCE DATE: December 1,1979 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 191/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/79-62 FINAL IDENTIFICATION OF OCCURRENCE:

On December 1,1979, with the reactor shutdown for scheduled maintenance, two moisture monitor flow transmitters were found to be out of tolerance, This could have resulted in plant protective system moisture monitors having actual sample flows lower than those specified by LCO 4.4.1 note (t) .

This is reportable per Fcrt St. Vrain Technical Specification AC 7.5.2(b)1 and 7.5.2(b)2.

EVENT DESCRIPTION:

On December 1,1979, with the reactor shutdown for scheduled maintenance, plant instrument personnel performing routine surveillance testing observed that two moisture monitor flow transmitters were out of tolerance.

Technical Specification LCO 4.4.1, note (t) specifies the minimum sample flow required at a given power level in order for a moisture monitor to be considered operable, as referenced in Table 4.4-1.

As a result of surveillance testing, it was discovered that two moisture monitors had actual sacple flcws which, when corrected for temperature and pressure, were less than the indicated flows. As a res ult , it is possible that the minimum sa=ple flow requirements of LCO 4.4.1 note (t) could not b3 met.

The table below provides a comparison of the values obtained during this surveillance.

Moisture Monitor Meter Indication Actual Corrected Flow Transmitter Flow in sec/see Samole Flcw (sec/sec)

FT-ll17 10 4.3 50 43.1 80 74.7 FT-ll18 10 5.4 b9 50 45.5 80 75.4

REPORTABLE OCCURRENCE 79-62 ISSUE O Page 2 of 3 EVENT DESCRIPTION: (Cont' d)

Per LCO 4.4.1 note (t) minimum sa=ple flew requirements for power levels above 70% are to be determined at a later date. Therefore, the values obtained at requirements.

sample flow an indicated flow of 80 sec/see wo ld not have affected the The monitors were still capable of providing a trip input to the plant protective system on high moisture. The moisture monitor system is oper-ated with sa=ple flows in excess of the minimum required.

CAUSE DESCRIPTION:

Cause of moisture monitor flow transmitters being out of tolerance was instrument calibration drif t.

CORRECTIVE ACTION :

Upon discovery that these fle/ transmitters were out of tolerance, they were recalibrated and the surveillance test successfully completed.

No further corrective action is anticipated or required.

1693 233

REPORTABLE OCCURRENCE 73-62 ISSUE O Page 3 of 3 Prepared By: 2M.# toc /b Cathy C.(Alirsch Technical Services Technician Reviewed By: L -

.I* W. Gah6 echnical Services Supervisor Reviewed By:

Frank M. Mathie Operations vanager Approved 3y: N [A h d 4M6,!h Don Warembourg Q'

Manager, Nuclear Production 1693 234