ML19320A986

Forwards LER 80-026/03L-0

ML19320A986
Person / Time
Site:	Fort Saint Vrain
Issue date:	06/19/1980
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfritt K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19320A987	List: ML19320A986 ML19320A988
References
NUDOCS 8007080422
Download: ML19320A986 (6)

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1 punne service company e ceItende 16805 ROAD 19%

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PLATTEVILLE, COLOR ADO 80651

, June 19, 1980 Fort St. Vrain Unit No. 1 P-80165 Mr. Karl V. Seyfrit, Director Nuclear Regulatory Commission Region IV Office of Inspection and Enforcement 611 Ryan Plaza Drive

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Suite 1000 Arlington, Texas- 76012

Reference:

Facility Operating License No. DPR-34 Docket No. 50-267 i

Dear Mr. Seyfrit:

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

80-26, Preliminary, submitted per the requirements of Technical Specifi-cation' AC 7.5.2(b)1 and AC 7.5.2(b)2.

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

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Reportable Occurrence Report No. 502267/80-26.

Very truly yours,

+ W Don Warembourg / I Manager, Nuclear Production DW/cls Enclosure ,

l cc: Director, MIPC 1

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OCCURRENCE REPORT DISTRIBUTION Number of Copies De pa r t men t o f E ne r gy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter)

San Francisco Operations Office Attn: California Patent Group 1333 Broadway Oakland, California 94612 De pa r t me n t o f E ne r gy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter)

Office of Nuclear Engineering Programs Washington, D.C. 20545 De p a r t men t o f Ene r gy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter)

Mr. Glen A. Newby, Chief HTR Branch ,

Division of Nuclear Power Development Mail Station B-107 Washington, D.C. 20545 De p a r t me n t o ' Ene r gy - - - - - - - - - - . - - - - - - - - - - - - - - - - - - - 1 (P Letter)

Attn: Senior Program Coordinator P. O. Box 81325 San Diego, California 92138 Mr. Karl V. Seyf rit. Director ------------------------- l

( 1 (Original of P Letter Region IV .

and Copy of LER)

Of fice of Inspection and Enforcement Nuclear Regulatory Commission 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012 Di r e c to r - - - - - - - - - - - - - - - - - - - - - - . - - - - - - - - - - - - - 1 (P Letter, LER)

Of fice of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 W. Bushnell, Site Manager - -------------------------- 10 (Original of FPLC Letter General Atomic Company plus Two Copics, One P. O. Box 426 Copy of P Lettr . , One Platteville, Colorado 80651 Copy of LER)

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

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REPORT DATE: June 19,1980 REPORTABLE OCCURRENCE 80-26 ISSUE O OCCURRENCE DATE: May 24, 1980 Page 1 of 4 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 191/2 PLATTEVILLE, COLORADO 80651 REPORT No. 50-267/80-26/03-L-0 Preliminary i

IDENTIFICATION OF  ;

OCCURRENCE:

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During performance of the monthly check of the helium circulator seal mal-function pressure differential switches. it was discovered that eight of twelve switch units tripped outside the limits specified in LCO 4.4.1, Table 4.4-3.

This is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)1 and AC 7.5.2(b)2.

EVENT DESCRIPTION:

During normal plant operation, instrument personnel performed the circulator i seal malfunction (buffer-mid-buffer) switch operability check. The switches are normally calibrated on an annual basis; however, due to the problems cited in the previous reports as listed on the LER, a check of buffer-mid-buffer trip settings on a monthly basis has been undertaken as an interim measure to test operability.

There are twelve buffer-mid-buffer switch units, three per circulator. Each switch unit contains two electrical switches. The range of the sensing ele-ment is from (-) 100 inches of water to zero to (+) 100 inches of water.

One of the electrical switches in each unit must operate at greater than or equal to (-) 10 inches water (negative buffer-mid-buffer), and the other electrical switch must operate at less than or equal to (+) 80 inches water (positive buffer-mid-buffer) per Table 4.4-3.

The trip settings for the twelve switches - are listed in Table 1.

The. switch settings, which were found to be less conservative than those established by the Technical Specification did not prevent the fulfillment i of the functional requirements of the system. '

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REPORTABLE OCCURRENCE 80-26

. ISSUE O Page 2 of 4 CAUSE DESCRIPTION:-

Dirt buildup and accumulation in the electrical switches prevented them from making proper contact.

CORRECTIVE ACTION:

The trip settings of the electrical switches were re-adjusted to the proper trip points.

Due to the continuing problems being experienced with the electrical switches, the interim check of the trip settings is being conducted on a monthly basis.

The investigation of the problem associated with the helium circulator seal malfuction trip switches has been completed, and Public Service Company Nuclear Project Department is proceeding on a path to replace the existing eq uipment.

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REPORTABLE OCCURRENCE 80-26 ISSUE O Page 4 of 4-

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Prepared By: 22J.

Asa B. Reed Technical Services Technician Reviewed By: / f

/e.T chnical W. 'Gahm Services Supervisor Reviewed By:

Frank M. Mathie Operations Manager Approved By: 4 Wm M Don Warembourg f7 Manager, Nuclear Production i

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REPORTABLE OCCURRE!!CE 80-26 ISSUE O Page 3 of 4 TABLE 1 As Found Inches H2O As Lef t Inches 1120 Increasing Decreasing Increasing Decreasing Trip Point Trip Point Trip Point Trip Point 1A Circulator PDIS-21149 +77 -9 +77 -9 PDIS-21151 +75 -15 @ +75 -6 PDIS-21153 +74 -19 @ +74 -5 1B Circulator . PDIS-21155 +88 h -20 h +77 -6 PDIS-21157 +74 +74

-23 @ -6 PDIS-21159 +92 h -8 +74 -8 1C Circulator PDIS-21150 +76 -13h +76 -6 PDIS-21152 +74 -12 @ +74 -6 PDIS-21154 +75 -5 +75 -5 1D Circulator PDIS-21156 +74 +74

-28 @ -3 PDIS-21158 +74 -7 +74 -7 P DIS-21160 +75 -8 +75 -8

@ Denotes switches which were cut of tolerance.