ML19305D707

Forwards LER 80-016/03L-0

ML19305D707
Person / Time
Site:	Fort Saint Vrain
Issue date:	04/09/1980
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19305D708	List: ML19305D707 ML19305D709
References
P-80073, NUDOCS 8004150432
Download: ML19305D707 (5)

Text

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public Service Company & CeRomale

{j 16805 Weld County Road 191/2, Platteville, Colorado 80651 t_ . a April 9, 1980 Fort St. Vrain Unit No. 1 i P-80073 Mr. Karl V. Seyfrit, Director Nuclear Regulatory Commission 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:

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

80-16, Preliminary, submitted per the requirements of Technical Specifi-  !

cation AC 7.5.2O)1 and AC 7.5.20)2. ,

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/80-16.

Very truly yours, h Wwb Don Warembourg Manager, Nuclear Productiw DW/cis Enciosure cc: Director, MIPC kood 5

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8004150

i REPORT DATE: April 9, 1980 REPORTABLE OCCURRENCE 80-16 :

ISSUE O OCCURRENCE DATE: March 22, 1980 Page 1 of 4 FORT ST. VRAIN NUCLEAR GENERATING STATION  ;

PUBLIC SERVICE COMPANY OF COLORADO l 16805 WELD COUNTY ROAD 191/2 i PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/80-16/03-L-0 Preliminary IDENTIFICATION OF OCCURRENCF:

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

Since reactor operation had taken place during the test interval, this is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)1 and l AC 7.L.2(b)2.

i EVENT  !

DESCRIPTION: [

While the reactor was in a shutdown condition, instrument personnel per-formed the circulator seal malfunction (buffer-mid-buffer) switch oper-ability 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. l Each switch unit contains two electrical switches. 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 switch settings which were found to be less conservative than those established by the Technical Specification did not prevent the fulfillment of the functional requirements of the system.

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

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REPORTABLE OCCURRENCE 80-16 l 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 i a-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 i malfunction trip switches has been completed, and Public Service Company Nuclear Project Department is proceeding on a path to replace the existing equipment. '

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i REPORTABLE OCCURRENCE 80-16 r ISSUE O Page 3 of 4

, TME 1 As Found Inches H2O As Left Inches H2O [

Increasing Decreasing Increasing Decreasing l Trip Point Trip Point Trip Point Trip Point PDIS-21149 1A Circulator +75 -5 +75 -5 PDIS-21151 +76 -8 +76 -4 PDIS-21153 +72 -7 +72 -7

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1B Circulator PDIS-21155 +78 -6 +76 -6  ;

PDIS-21157 +810 -5 +76 -5 f

{

PDIS-21159 +73 -8 +73 -8 t 1C Circulator PDIS-21150 +77 -28 O +77 -8 [

PDIS-21152 +78 -35 O +78 -8 I

PDIS-21154 +77 -5 +77 -5 l 1D Circulator PDIS-21156 +73 -30 C +73 -6  !

PDIS-21158 +74 -5 +74 -5 PDIS-21160 +75 -8 +75 -8

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@ Denotes switches which were out of tolerance.

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REPORTABLE OCCURRENCE 80-16 ISSUE O Page 4 of 4 J >

Prepared By: ,

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Mic(ael J. Ferri '.

Techtlical Servi s Engineer l

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Reviewed By: > // , d75V l

J4 W. Gahm '

, Technical Services Supervisor

, Reviewed By: \ i Frank M. Mathie Operations Manager Approved By: N ,s,m _A _ y Don Wareinbourg g Manager, Nuclear Productioff f

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