05000267/LER-1982-034, Forwards LER 82-034/03L-0.Detailed Event Analysis Encl

Forwards LER 82-034/03L-0.Detailed Event Analysis Encl

ML20071M438
Person / Time
Site:	Fort Saint Vrain
Issue date:	09/13/1982
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20071M441	List: 05000267/LER-1982-034, Forwards LER 82-034/03L-0.Detailed Event Analysis Encl 05000267/LER-1982-034-03, /03L-0:on 820814,emergency Feedwater Supply to Loop 1 Helium Circulator Pelton Wheel Drives Isolated During Maint on Pressure Control Valve PV-21243-1.Caused by Valve Internal & Outlet Piping Leakage Due to Normal Wear
References
P-82388, NUDOCS 8209270124
Download: ML20071M438 (5)

LER-1982-034, Forwards LER 82-034/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2671982034R00 - NRC Website

text

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September 13, 1982 Fort St. Vrain b:i SEP I 6122 c

Unit No. 1 P-82388 i

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h Mr. John T. Collins, Regional Administrator Region IV Nuclear Regulatory Commission 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. 50-267/82-034, 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. 50-267/82-034.

Very truly yours, JXund Don Warembourg Manager, Nuclear Production DW/cis Enclosure cc:

Director, MIPC 1

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9207270124 820913 PDR ADOCK 05000267 S

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REPORT DATE:

September 13, 1982 REPORTABLE OCCURRENCE 82-034 ISSUE O CCCURRENCE DATE: Aucust 14, 1982 Page 1 of 4 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 19 1/2 PLATTEVILLE, COLORADO 80651-9298 REPORT NO. 50-267/82-034,03-L-0 Final IDENTIFICATION OF OCCURRENCE:

On August 14, 1982, with the reactor operating at approximately 70%

power, the Loop 1 emergency feedwater header to the Loop 1 helium circulator pelton wheel drives was taken out of service for maintenance.

This constitutes a degraded mode of Fort St.

Vrain Technical Specification LCO 4.2.2, Section a, and is reportable per AC 7.5.2(b)2.

EVENT

DESCRIPTION

Reference Figure 1 On August 14, 1982, PV-21243-1 (Loop 1 emergency feedwater pelton wheel drive header pressure control valve) was reported to have a body-to-bonnet flange leak.

This leak did not affect the system control as PV-21243 (upstream of PV-21243-1) was still operational.

PV-21243-1 had previsusly been suspected of having internal seat leakage also.

At 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> the same day, a system clearance was obtained to isolate and perform corrective maintenance to PV-21243-1.

This isolation required closing V-211615 (Loop 1 emergency feedwater pelton wheel drive header isolation valve) which removed the emergency feedwater turbine drive capability to 1A and 1B helium circulators.

The header was isolated for a total of 5.25 hours2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br /> during maintenance, within the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> allowed by LCO 4.2.2, Section a.

Had it been necessary during this period, emergency condensate and firewater could have been utilized to drive tr.t circulator peltons.

CAUSE

DESCRIPTION:

The leakage observed at PV-21243-1 was found to be from a minute hole on the 1/2" outlet piping of PV-21243-1. Due to the location and direction of the leakage, it was first thought to be emitting from the body-to-bonnet area.

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REPORTABLE OCCURRENCE 82-034 ISSUE 0 Page 2 of 4 The internal leakage was due to normal wear of the seat and disc seating surfaces.

CORRECTIVE ACTION:

PV-21243-1 was disassembled, and repairs were made to the internals and the affected section of outlet piping. The piping was replaced with an acceptable replacement which has a thicker wall than the original section.

The header was returned to service at 2115 hours0.0245 days <br />0.588 hours <br />0.0035 weeks <br />8.047575e-4 months <br /> on August 14, 1982.

No further corrective actions are anticipated or required.

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V-211615 PV-21243 Water Turbine Drive liole Found in 1/2" Outlet d b Piping of PV-21243-1 IB llelium Circulator v

Water Turbine Drive PV-21243-1 1

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REPORTABLE OCCURRENCE 82-034 ISSUE O Page 4 of 4 Prepared By:

12M w Owen J. @ Services sechnician yton Q

Technica r Reviewed By:

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Techniedl Services Engineering SJperVisor

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Reviewed By:

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Edwin 0."HP11 D' Station Manager Approved By:

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Don Warembourg ff Manager, Nuclear Prodtrction