ML19323F186

Forwards LER 79-018/03X-1

ML19323F186
Person / Time
Site:	Fort Saint Vrain
Issue date:	05/09/1980
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19323F187	List: ML19323F186 ML19323F196
References
P-80101, NUDOCS 8005280625
Download: ML19323F186 (4)

Text

-n.,

public service company e cdonde

( 16805 Weld County Road 191/2, Platteville, Colorado 80651 l%-:a May 9, 1980 Fort S t. Vrain Unit No. 1 P-80101 Mr. Karl V. Seyfrit, Director Nuclear Regulatory Commission Region IV Office of Inspection and Enforcement til 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/

79-18, Final Supplement, submitted per the requirements of Technical Speci-fication AC 7.5.2(b)2.

Also, please find enclosed one copy of the Licensee Event Report for Re ortable Occurrence Report No. 50-267/79-18.

Very truly yours, Ww Don Warembourg Manager, Nuclear Production DW/cls Enclosure cc: Director, MIFC f

S005@O b

REPORT DATE: May 9, 1980 REPORTABLE OCCURRENCE 79-18 ISSUE 1 OCCURRENCE DATE: June 30. 1980 Page 1 of 3 i

3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 19 1/2 PLATTEVILLE, COLORADO 80651 l REPORT NO. 50-267/79-18/03-X-1

! Final Supplement i IDENTIFICATION OF OCCURRENCE:

On June 30, 1979, with the reactor operating at approximately 1.4%, HV-4153, one of two motor operated butterfly valves which provide a tie between the circulating water system and the service water system, was found to j be inoperable by remote manual control. Because the basis of LCO 4.2.4,

Service Water Pumps, references operability of this valve by remote manual j action as outlined in Final Safety Analysis Report Section 10.3, this consti-i tutes operation under a degraded mode of LCO 4.2.4, and is reportable per Technical Specification AC 7.5.2(b)2.

EVENT DESCRIPTION:

i On June 30, 1979, while operating at approximately 1.4% thermal power, plant operations personnel observed dual position indication for HV-4153, where ZI-4153 on I-06 was indicating both open and closed. Further investi- _

gation revealed that the valve was closed, but was not fully seated. Subse-quent attempts to operate the valve from its associated hand switch were unsuccessful. Although this valve would not operate from the motor drive

due to the amount of torque required, it could be operated locally with the handjack.

The basis of Technical Specification LCO 4.2.4, Service Water Pumps, states that the availability of the service water system ensures the capability of supplying essential components with cooling water as described in Final Safety Analysis Report, Sections 1.4, 10.3, and 14.4 Section 10.3.9 of the Final Safety Analysis Report, Cooldown with Safe Shutdown Equipment Items Following " Safe Shutdown Earthquake" or " Maximum Tornado", references ,

, the fact that makeup pump discharge is connected by remote manual action (via this valve as operated from the hand switch) to the service water pump suction pit. With this valve inoperable from the switch, the tie between the two systems is still available by manual operation of the valve; thus, requirements for cooling water to essential components could still be met.

REPORTABLE OCCURRENCE 79-18 ISSUE 1 Page 2 of 3 CAUSE DESCRIPTION:

The reason for the inability to operate this valve from the associated hand switch is unknown. Attempts to cycle the valve indicated that it would partially open by operation of the hand switch.

CORRECTIVE ACTION:

I Investigation by both Electrical and Maintenance personnel found the reported problem to be an isolated occurrence. The system was cleared out for work on November 27, 1979, and repeated valve manipulations via the hand switch indicated that the valve was operable. Because no problem existed with valve operability, no maintenance was performed.

No further corrective action is anticipated or required.

4 6

, a"w -

9 REPORTABLE OCCURRENCE ?"-18 ISSUE 1 Page 3 of 3 Prepared By: tr$4_ b ) I'c e b Cathy C/ Hirsch Technical Services Technician Reviewed By: o// ,

W/ Gahm

/~TedhnicalServicesSupervisor Reviewed By:

Frank M. Mathie Operations Manager Approved By: 7/[tre ,

Don Warembourg ff Manager, Nuclear Productron i

I

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