05000267/LER-1980-061, Forwards LER 80-061/03L-0

Forwards LER 80-061/03L-0

ML20002A757
Person / Time
Site:	Fort Saint Vrain
Issue date:	10/31/1980
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20002A758	List: 05000267/LER-1980-061, Forwards LER 80-061/03L-0 05000267/LER-1980-061-03, /03L-0:between 801003 & 13,on Three Occasions, Plant Operated W/Individual Snubbers Out of Svc.Caused by Need for Maint.One Snubber Filled W/Oil & Two Snubbers Adjusted
References
P-80386, NUDOCS 8011210477
Download: ML20002A757 (5)

LER-1980-061, Forwards LER 80-061/03L-0

Event date:
Report date:
2671980061R00 - NRC Website

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PLATTEVILLE, COLOR ADO 80651 October 31, 1980 Fort St. Vrain Unit No. I r.

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Mr. Karl V. Seyf rit, Director rn on

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Nuclear Regulatory Commission V

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/

.80-61, 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. 50-267/80-61.

Very truly yours, c(

Don War ybourg Manager, Nuc3 ear Production DW/cis Enclosure cc: Director, MIPC 1

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- e OCC'JRRENCE REPORT D!5tRIBUtt0'i N 2meer of Copies De pa r tmen t o f Ene r gy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

1 (P Letter)

San Francisco Operatione Of fice Atta California Patent Group 1333 Broadway.

' Cakland, California 94612' De pa r tment o f E ne r gy. - - - - - - - - - -. - - - - - - - - - - - - - - - - - -

1 (P Letter)

Office of Nuclear Engineerios Programs

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Vashington, D.C.

20545 i

De p a r t ama t o f Ene r gy '. - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

1 (P Letter)

Mr. Glen A. Newby, Chief WTR Branch Diviaton of Nuclear Power Development.

Mail Station 8-107 Washington, D.C.

20$45 De pa r tme nt o f Ene r gy - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

1 (P Letter)

Attat Senior Program Coordinator P. O. Box 81325 San Diego, California 92138 Mr. Ka rl V. S e y f ri t. Dire ctor.. - - - - - - - - - - - - - - - - - - - - - - - -

1 (Original of P Letter Ragion IV and Copy of LER)

Office of Inspection and Enforcement Nuclear Regulatory Commission 611 Ryan Plaza Drive Suite 1000 i

Arlington, Texas 16012 Director - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

1 (P Letter, LER)

Of fice of Management Information and Program Co.itrol U. S. Nuclear Regulatory Commission Washington, D.C.

20555 Mr. 11 ch a rd Phe lp e - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (Original of FPLG Letter FSV. CA, Site plus.TVo Copies, One

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Representative Copy of P Letter, One General Atomic Company Copy of LER)

P. O. Box 426 Plattaville, Colorado 80651 3

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f r. B ill La va lee - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

1 (P Letter LER) h. clear Safety Analysis Center

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P. O. Box 10412 Palo Alto. California. 94303

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NRC Resident $1te Inspector

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REPORT DATE:

October 31, 1980 REPORTABLE OCCURRENCE 80-61 ISSUE O

' OCCURRENCE DATE:

October 3.1980 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WEIE COUNTY ROAD 191/2 PLATTEVILLE, COLORADO 80651 a

REPORT No. 50-267/80-61/03-L-0 i

Final l

IDENTIFICATION OF OCCURRENCE:

On three. separate occasions between October 3, 1980, and October 13, 1980, the plant was operated with individual suubbers out of service for corrective /

i preventive maintenance.

Although the snubbers were _ operable prior to removal from service, these oc-currences are being. interpreted as a degraded mode of I40 4.'3.10, and are being repo:ted per Fort St. Vrain Technical Specification AC 7.5.2(b)2.

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EVENT

DESCRIPTION

__ From October 3 through October 13, 1980, three snubbers were removed from service f or preventive / corrective maistenance. All three snubbers were in l

place and operable prior to their removal from service; however, a decision was made to perform the maintenance activities with the plant in operation in order to assure continued snubber operability. Because LCO 4.3.10 does not provide for removal of snubbers from service for preventive maintenance, i

these events are being interpreted as a degraded mode of the LCO. Details I

of ~ each occurrence are provided below.

a 1.

At 0950 hours0.011 days <br />0.264 hours <br />0.00157 weeks <br />3.61475e-4 months <br /> on October 3,1980, with the reactor operating at approximately 4% thermal power, CRS-822 was removed from service to fill the oil reservoir. A Plant Trouble Report had been initiated on September 22, 1980, stating that the snubber was low on oil.

The low oil situation did not render the snubber inoperable; however, on October 3, a decision was made to fill the snubber reservoir, thus ensuring its continued operability. The reservoir-was filled per approved procedure and the snubber returned en service at 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on October 3,1980.

I 2.

Analysis' of a Plant Trouble Report initiated on October 7,1980, indicated that re-orientation of HOS-89 would be advisable, although the snubber was operable. On October 10, with the plant operating at 46% power and 133 MWe, H05-89 was still operable, but a decision-

~ was made to re-orient the snubber to assure that possible inter-farence problems would not render it inoperable. It was necessary I'

to remove the snubber from service in order to revise the reservoir orientation.. The snubber was removed at 1020 hours0.0118 days <br />0.283 hours <br />0.00169 weeks <br />3.8811e-4 months <br /> on October 10, 1980, and was returned to. service at 1220 hours0.0141 days <br />0.339 hours <br />0.00202 weeks <br />4.6421e-4 months <br /> the same day.

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REPORTABLE OCCURRENCE 80-61 ISSUE O Page 2 of 3 EVENT

DESCRIPTION

(Cont'd) 3.

At 0937 hours0.0108 days <br />0.26 hours <br />0.00155 weeks <br />3.565285e-4 months <br /> on October 13, 1980, with the plant operating at ap-proximately 46% thermal power and 130 MWe, HRS-159 was removed from service to elevate the oil reservoir. Analysis of a Plant Trouble Report initiated on October 9 indicated that although tha reservoir was not at the optimum angle, the snubber was operable.

On October 13, the snubber was still operable, but a decision was made to remove it from service to raise the reservoir, thus pro-viding greater gravity feed of oil from the reservoir to the snub-bar, and ensuring continued operability. The work was completed and the snubber returned to service at 1300 hours0.015 days <br />0.361 hours <br />0.00215 weeks <br />4.9465e-4 months <br /> on October 13.

Because the snubbers were operable prior to their removal from service, no adjustnent to the surveillance interval for SR 5.3.8a-X is required.

CAUSE

DESCRIPTION:

Cause of degraded mode operation in each instance covered by this report was removal of operable snubbers from service in order to perform preventive /

corrective maintenance. Details are as follows:

1.

Snubber CRS-822 was removed from service to fill the oil reservoir.

Although operable, the snubber was previously noted to be low on oil.

2.

Snubber HOS-89 was removed from service to re-orient the reservoir to preclude the possibility of future interference with structural material.

3.

Snubber ERS-139 was removed from service to elevate the oil reser-voir, thus assuring :ontinued supply of oil to the snubber.

CORRECTIVE ACTION:

Corrective actions for the occurrences described in this report were as follows:

1.

Snubber reservoir of CRS-822 was filled with oil per approved pro -

cedure, and the scubber returned to service.

2.

The reservoir of snubber HOS-89 was re-oriented to preclude inter-ference problems, and the snubber returned to service.

3.

The reservoir of snubber HRS-159 was elevated to assure continued oil supply, and the snubber returned to service.

No further corrective action is anticipated or required.

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.m REPORTABLE OCCURRENCE 80-61 ISSUE O Page 3 of 3 Prepared By:

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Cathy C/ Rirsch Technical Serv' ;es Technician Reviewed By:

W. Gahm Technical Services Supervisor Reviewed By:

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Frank M.jMathiy

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Operations Manager Approved By:

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Don Warenbourg' -/

Managed Nuclear Production