05000267/LER-1981-010, Forwards LER 81-010/03L-0

Forwards LER 81-010/03L-0

ML20003B832
Person / Time
Site:	Fort Saint Vrain
Issue date:	02/19/1981
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20003B833	List: 05000267/LER-1981-010, Forwards LER 81-010/03L-0 05000267/LER-1981-010-03, /03L-0:on 810120,five Sample Flow Circuits Found Out of Calibr.Caused by Change of Instrument Characteristics.Calibr Values Revised & Flow Transmitters Recalibr.Alarm Setpoint Functional Test Values Also Changed
References
NUDOCS 8102250648
Download: ML20003B832 (4)

LER-1981-010, Forwards LER 81-010/03L-0

Event date:
Report date:
2671981010R00 - NRC Website

text

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l February 19, 1981 Fort St. Vrain u

Unit Nc. 1 P-81059 Mr. Karl V. Seyfrit, Director Nuclear Regulatory Cornission Region IV Office of Inspection and Enforcement 611 Ryan Pla:a 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/

81-010, Final, submitted per the requirements of Technical Specification AC 7.5. (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. 50-267/81-010.

Very truly yours, W&

Don Warembourg Manager, Nuclear Production DW/cls O

Enclosura.

S cc: Director, MIPC

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8102 250 d d

REPORT DATE:

February 19, 1981 REPORTABLE OCCURRENCE 81-010 Determined ISSUE O OCCURRENCE DATE:

January 20. 1981 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 19 1/2 PLATIEVIILE, COLORADO 80651 REPORT NO. 50-267/ 81-010/03-L-0 i

Final IDENTIFICATION OF OCCURRENCE:

During the annual calibration of the primary coolant dewpoint moisture moni-tor flow instrumentation, it was discovered that five of the sample flow circuits were out of calibration either before or af ter the surveillance procedure was completed. This is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)1 as setpoints being less conservative than required and per Fort St. Vrain Technical Specification AC 7.5.2(b)2 as a degraded mode of LCO 4.4.1, Table 4.4-1.

EVENT

DESCRIPTION

While performing the annual calibration of the primary coolant moisture scram instruments, plant instrument personnel observed that five of the sam-ple flow instruments were out of calibration in the non-conservative direc-tion and could have resulted in the operation of the primary coolant moi-sture scram instruments with the sample flow lower than required by note (c) of LCO 4.4.1.

The instruments were recalibrated, as required, and the sur-veillance completed.

Review of the surveillance data at a later date revealed that five of the -

4 sample flow instruments were left out of calibration in the non-conserva-tive direction. The instruments could not be brought into calibration be-cause of shift of the characteristic curve. The Results Engineering Super-visor analyzed the data and provided new calibration data for the sample flow instruments to insure that the sample flows are conservative with re-spect to the limits of LCO 4.4.1 note (t).

The new calibration data was also incorporated into the sample flow alarm functional test to provide the proper alarm setpoints to ensure compliance with the sample flows alarm setpoints specified in note (t) of LCO 4.4.1.

The monitors vere still capable of providing a trip input to the plant pro-tactive system-on high moisture. The moisture monitor system is operated with sample flows -in excess of the minimum required.

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REPORTABLE OCCURRENCE 81-010 ISSUE O Page 2 of 3

CAUSE

DESCRIPTION:

The cause of the instruments being out of calibration was the changs of

- characteristics of the flow elements during the time the elements have been in service. The individual changes in the flow elements characteristic curves has necessitated the use of individual calibration curve and alarm setpoint values for each of the separate flow elements.

CORRECTIVE ACTION:

The revised calibration values for each of the flow elements is being incor-porated into the annual calibration procedure and the monthly alarm functional test.

The sample flow alarm setpoints were adjusted to the new calibration values to assure that the alarm requirements of LCO 4.4.1 note (t) are met.

No further corrective action is anticipated or required for the calibration change of the FE's as stated in this report.

REPORTABLE OCCURRENCE 81-010 ISSUE O Page 3 of 3 Prepared By:

Asa B. Reed Technical Services Te hnician Reviewed By:

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. W. CEm' echnical Services Supervisor Reviewed By:

Frank M. Mathie Operations Manager Approved By:

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Don Warembourg g

Manager, Nuclear Production

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