ML19340B262

Forwards LER 80-049/03L-0

ML19340B262
Person / Time
Site:	Fort Saint Vrain
Issue date:	10/01/1980
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19340B263	List: ML19340B262 ML19340B272
References
P-80347, NUDOCS 8010210711
Download: ML19340B262 (5)

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puhue a " .vice company e conende 16805 ROAD 19%

PLATTEVILLE, COLOR ADO 80651 October 1,1980

-Fort St. Vrain Unit No.1

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P-80347 Mr. Karl V. Seyfrit, Director Nuclear Regulatory Commission

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Region IV Office of Inspection and Enforcement ,

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611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012

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Re ference: Facility Operating License No. DPR-34

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Docket No. 50-267

Dear Mr. Seyfrit:

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Enclosed please find a sapy of Reportable Occurrence Report No. 50-267/

80-49,' Final, submitted per the requirements of Technical. Specification AC 7.5.2(b)l.

Also, please find enclosed one copy-of the Licensee Event Report for 3

- Reportable Occurrence Report No. 50-267/80-49.

Very truly yours, bu y Don Warembourg Q Manager, Nuclear. Production

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DW/cl's Enclosure '

cc: - Director, MIPC

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80-1021407//i -

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OCCL'RRENCE REPORT DISTR 13L7 ION

' Number of Copies De pa r tment is f Ener gy - - . - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter) -

San Francisco Operations Office Atta: California Patent Group 1333 Broadway Cakland, California 94612 De p a r tmen t o f E ne r gy - - - - - '- - - - - - - - - - - - - - - - - - - - - - - -

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1 (P Letter)

Office of Nuclear Engineering Programs .

4 Washington, D.C. 20545 Dep ar tmen t o f Ene r gy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

?!r. Glen A. Newby, Chief 1 (P Letter)

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dTR 3 ranch

, Division of Nuclear. Power Development

, Mail Station B-107 Washington, D.C. - 20545 Depar tme nt o f Ene r gy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter) 1 Atta: . Senior Program Coordinator

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P. O. Sox 81325 i

, ' San Diego, California .92138 r--

Mr. Karl V. Seyfrit,' Director -- ---- ------------------- 1 (Original of P Letter

- Region IV and Copy of LER)

Office of Inspection and Enfortement '

Nuclear Regulatory Comr.ission 611 Ryan Plaza Drive Saite 1000 arlington, Texas . 7601:

D i re c t o r - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1- (P Letter, LER)

Office of Managemenc Information and Program Control U. S._ Nuclear Regulatory Commission.

Washington, D.C. 20555 Mr . Ti ch a r d Ph e lp s - - - - - - - - - - - - - - - - - - - ' - - - - - - - - - - - - 1 FSV, GA. $f re (Original of FPLG Letter Representative plus Two Copier, One

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"eneral Atomic Company

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cooy og p t,ge 7, c,

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P. O. Box 426 copy og (gg)

• Platteville, Colorado 80651 g M r . ' Bil l Lava lee - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter, LER)

Nuclear Safety. Analysis . Center ,

i. 3412 Killview Avenue P. O.' Sox 10412

. Palo Alto, California 94303

-NRC Resident Site Inspector ------------------------- - 1 (P Letter, LER)

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REPORT DATE: -October 1, 1980 REPORIABLE OCCURRENCE 80-49 ,

-ISSUE O

.0CCURRENCE DATE: _ Seotember 4. 1980 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WE1D COUNTY ROAD 19 1/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/80-49/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

During a routine surveillance calibration check, the setpoint of the PCRV rupture disc assembly, M-11702, was found to be 826 psig. Since this set-point is higher than the 312 psig

• 1% allowable bv Fort St. Vrain Techni-cal Specification LSSS 3.3.2(c), it is being reported per Fort St. Vrain Technical Specification AC 7.5.2(b)1.

EVENT DESCRIPTION:

With the reactor shutdown and depressurized for a maintenance shutdoun per-iod, low set rupture disc, M-11702, was removed from service for a scheduled

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surveillance calibration bench test. The "as found" pressure setpoint was 326 psig. The acceptance criterion of LSSS 3.3.2(c) requires the set pres-sure to be 812 psig + 1% (804 psig to 820 psig).

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.; Re# r to Figure 1. Before the te.it gas pressure is applied, the cutter, 1 , is removed and a special ring is installed to limit the travel of the Be1Js7111e washers, 2 . These washers snap over when the set pressure is

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reached. Adj us nt of the set pressure is made by positioning of the When the set pressure is reached, the diaphragm and

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4 threaded ring, .

l washers travel a ew '.housandths of an inch, which produces an audible

" thump." d CAUSE DESCRIPTION:

The rupture disc. movement setpoint being out of tolerance was caused by drift of the Belleville washer operating point over the period since its last cali-bration surveillance.

CORRECTIVE ACTION:

The threaded ring holding the Belleville washers was adjusted until the

-rupture disc operated at. 812 psig and the unit was returned to service.

No.further corrective-action is. anticipated or required.

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REPORTABLE OCCURRENCE 80-49 ISSUE O Page 3 of 3 l

Prepared By: _

Asa B. Reed Technical Services Technician Reviewed By:

W. Gahm echnical Services Supervisor Reviewed By: /7' d Frank M. Mathie Operations Manager l Approved'By: W Ww fAf h Don Warembourg .

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Manager,' Nuclear Production j

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