05000267/LER-1980-046, Forwards LER 80-046/03L-0

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Forwards LER 80-046/03L-0
ML19338D642
Person / Time
Site: Fort Saint Vrain 
Issue date: 09/19/1980
From: Warembourg D
PUBLIC SERVICE CO. OF COLORADO
To: Seyfrit K
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19338D643 List:
References
P-80328, NUDOCS 8009230597
Download: ML19338D642 (4)
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LER-1980-046, Forwards LER 80-046/03L-0
Event date:
Report date:
2671980046R00 - NRC Website
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text

-

- 7 public service company or Odendo:

l 16805 ROAD 19%

PLATTEVILLC, COLC AADO 80651 -

Sr.p tember. 19, 1980 lort St. Vrain Unit No. l'

~

P-80328 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:

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

80-45, Final, submitted per the requirements of Technical Specification AC 7.5.2(b)2..

Also, please find enclosed ona copy of the Licensee Event Report for Reportable Occurrenc'e Report No. 50-267/80-46.

Very truly yours,

$U u.w l%

w Don Warembourg Manager Nuclear Production DW/cis Q

Enclosure cc: Director, MIPC f[

80092305.971

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Tjc y

-. REPORT DATE:

Septemb'er 19, 1980' REPORTABLE OCCURRENCE 80-46'

- ISSUE O OCCURRENCE - DATE:

'Auaust'20, 1980 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATIZ STATION PUBLIC SERVICE CGIPANY'0F COLORADO t16805 WELD COUNTY ROAD 191/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/80-46/03-L-0 Final IDENTIFICATION OF-OCCURRENCE:

From 1000lto'1115 hours0.0129 days <br />0.31 hours <br />0.00184 weeks <br />4.242575e-4 months <br /> on August 20, 1980, the plant was operated at power with the outlet 1 water temperature of the PCRV cooling water system greater than 120*F.

This constitutes operation in a degraded mode of LCO 4.2.15 b) and is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)2.

EVENT

DESCRIPTION

At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on August 20, 1980, with the plant operating at approximately 25% thermal power,. an entry was made in the operations log to indicate that the PCRV. cooling water outlet temperature was greater than 120*F.

Technical Specification LCO 4.2.15 b) states that the maximum outlet uater temperature of the PCRV cooling water system shall'not exceed 120*F.

The-reactor plant cooling water system provides cooling water to maintain PCRV concrete temperatures within established limits based on design heat loads.-

The. temperature of cooling water supplied to the PCRV barrel and top head, core support floor, 'and PCRV bottom head and bottom penetrations is via temperature controllers TC-4637 and TC-4638. These controllers are normally

. operated in the ~ automatic mode with the valves modulating to maintain temp-erature at a preset value.

A portion o5 the cooling water supplied via the on-line cooling water pump is diverted _to. the ~ PCRV top penetrations.. If desired, this water can be ad-mitted to the penetrations via -operation of TC-46209 and TC-46210 to vary the temperature by mixing hot and cold cooling. water supply. During normal plant operation, this design fenture is not utilized, and the system is oper-ated with TC-46209 and TC-46210 in manual with the corresponding valves closed.

TC-4637 and TC-4638, controllers for, the remainder of the system, are located in close proximity on~ che same control panel.

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,e REPORTABLE OCCURRENCE 80-46 ISSUE O Page 2 of 3

' EVENT

. DESCRIPTION: (Cont'd).

On. the day of this 'occurr2nce, the Shift Supervisor noticed that TC-46209 and TC-46210. were in the automatic mode with. the corresponding valves fluctu-ating. At that time, TC-4637 and TC-4638 were in automatic, which was the correct configuration. ' Discussion between the Operator and Shif t-Supervisor disclosed no reason f or TC-46209 and TC-46210 being.in automatic, and a.de-cision 'was made to return the ' controllers to manual. However, because of-the clcse proximity on the control ~ panel of-the four controllers in question, the Operator inadvertently placed TC-4637 and TC-463S in manual,-leaving TC-46209 and _ TC-46210 in automatic.1The ~ corresponding valves (TV-4637, 4637-1,14638, and 4638-1) went closed, thus isolating the cooling water to

- the system. Shortly after TC-4637 and TC-4638 were placed in manual, PCRV outlet cooling water temperature exceeded the Technical Specification limit of 120*F.

Chech of.the temperature. recorder' revealed a maximum temperature of 134*F. was reached-at approximately 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />.

Immediately upon. discovery of the out' of limit temperature, TC-4637 and TC-4638 were~ returned to the automatic position, the valves opened, and by 1115 hours0.0129 days <br />0.31 hours <br />0.00184 weeks <br />4.242575e-4 months <br />, the temperature had returned to an acceptable' limit. By 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br />, temperature had stabilized 'at approximately 110 to 112*F, which is the normal operating temperature.

No further operation-in a degraded mode of LCO 4.2.13 was observed'.

CAUSE

DESCRIPTION:

Cause of the out of. limit PCRV cooling water. outlet temperature was the in-advertent isolation of the cooling water to system 46 due to operation of the wrong controllers,

= CORRECTIVE ACTION:

Upon discovery that-the temperature had exceeded the Technical Specification limits, TC-46209. and TC-46210 were placed in 'nanual, TC-4637 and TC-4638 were returned 'to automatic, and the corresponding valves opened. PCRV cooling water outlet temperatures returned to acceptable limits by 1115 hours0.0129 days <br />0.31 hours <br />0.00184 weeks <br />4.242575e-4 months <br /> and no further operation occurred in a degraded mode-of LCO 4.2.15.

No further corrective-action is anticipated or required.

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o REPORTABLE CCCURRENCE 80-46 ISSUE O Page 3 of 3 Prepared By:

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bd.

Cathy C. Hirsch a

Technical Services Technician Reviewed 3y:

./

/ Technical Services Supervisor

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- Reviewed By:

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Frank M.

!athie

~

Operations Manager (E'

[4./tt.A t-Approved By:

'> c..t.fy i;

Don Warembourg

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Manager, Nuclear Production d'~

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