05000267/LER-1982-031, Forwards LER 82-031/03L-0.Detailed Event Analysis Encl

Forwards LER 82-031/03L-0.Detailed Event Analysis Encl

ML20063K324
Person / Time
Site:	Fort Saint Vrain
Issue date:	08/26/1982
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20063K326	List: 05000267/LER-1982-031, Forwards LER 82-031/03L-0.Detailed Event Analysis Encl
References
P-82358, NUDOCS 8209030346
Download: ML20063K324 (4)

LER-2082-031, Forwards LER 82-031/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2672082031R00 - NRC Website

text

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. Public seMee Company *2 Odlemmflo 16805 Weld County Road 191/2, Platteville, Colorado 80651-9298 e

August 26, 1982 Fort St. Vrain Unit No. l P-82358 .l jf,

,L3 ~

NE 301982 i Mr. John T. Collins, Regional Administrator lL l Region IV f.

Nuclear Regulatory Comission 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/

82-031, Final, submitted per the requirements of Technical Specification AC 7.5.2(b)2.

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/82-031.

Very truly yours, O.m Wau m b,, q tv)W m cdA Don Warembourg Manager, Nuclear Production DW/cls Enclosure ,

cc: Director, MIPC 4

, 8209030346 820826 PDR ADOCK 05000267 S PDR

9 REPORT DATE: August 26, 1982 REPORTABLE OCCURRENCE 82-031 ISSUE O OCCURRENCE DATE: July 27, 1982 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 191/2 PLATTEVILLE, COLORADO 80651-9298 REPORT NO. 50-267/82-031/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

On July 27, 1982, with the reactor operating at approximately 70%

power, the Loop 2 emergency feedwater header to the Loop 2 helium circulator pelton wheel drives was taken out of service. This constitutes a degraded mode of Fort St. Vrain Technical Specification "

LCO 4.2.2 and is reportable per AC 7.5.2(b)2.

EVENT DESCRIPTION:

At 2230 hours0.0258 days <br />0.619 hours <br />0.00369 weeks <br />8.48515e-4 months <br /> on July 24, 1982, Loop 2 emergency feedwater pelton -

wheel drive header pressure control valve, PV-21244, was discovered to be leaking past its seat. Control Room operators were able to maintain proper system pressure control by adjustment of the pressure controller, PIC-21244.

At 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> on July 27, 1982, the Loop 2 emergency feedwater header to the pelton wheel drives was isolated to perform maintenance on PV-21244 At 1345 hours0.0156 days <br />0.374 hours <br />0.00222 weeks <br />5.117725e-4 months <br /> on July 27, 1982, it was decided to perform a preventative maintenance calibration and alignment of the valve controller, PIC-21244, while the header was out of service for the valve repair.

At 0545 hours0.00631 days <br />0.151 hours <br />9.011243e-4 weeks <br />2.073725e-4 months <br /> on July 28, 1982, the Loop 2 emergency feedwater header was returned to service. Fort St. Vrain Technical Specification LCO 4.2.2(a) requires that a supply of cmergency feedwater be available to drive the circulator water turbine drives, allowing however, for isolation of the emergency feedwater supply for up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> without the helium circulators being considered inoperable.

If necessary, the affected helium circulators could have been operated on the water turbine drive at reduced speed, utilizing the water supply from the emergency condensate or firewater systems.

REPORTABLE OCCURRENCE 82-031 ISSUE O Page 2 of 3 CAUSE DESCRIPTION:

The water / steam cutting of the disc and seat are attributed to normal wear.

CORRECTIVE ACTION:

The valve disc, seat ring, and gaskets were replaced, and the valve was returned to service.

During the repair of the valve internals, dye penetrant testing of the removed seat ring revealed a crack between the stellited seating surface and the surrounding base metal. Subsequent testing revealed similar flaws in another seat ring which had been previously removed from service and, also in a new seat ring. Another new seat ring, which was finally installed in the valve, passed the dye penetrant test. Even though the discovered flaws are not directly attributable to the seat leakage, as a precautionary measure, they were not placed in service.

The new, cracked seat ring was returned to the manufacturer for replacement. Future Quality Assurance requirements will include a dye penetrant check of the seat rings before stocking them into the plant stores warehouse.

The pressure controller flapper and nozzle were replaced as a preventative maintenance measure, and the unit was calibrated and aligned.

The Loop 2 emergency feedwater header to the circulator pelton wheel drives was returned to service after 22.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

~

0 REPORTABLE OCCURRENCE 82-031 ISSUE O Page 3 of 3 i

1 1 Prepared By: + N 11 -

Faut A.' Tramp /

Technical Services Technician 1

Reviewed By: L Charles Fuller Mh Technical Services Engineering Supervisor Reviewed By: 23 J:.0 U .f M Edwin D. H10

. Station Manager

, Approved By: Oso W e~ h ~.. M ynh aa '

00n Warembourg /

(

Manager, Nuclear Production l

i I

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