ML20062N183

Unique Rept 82-1:on 820706,diesel Fire Pump 1P-49 Declared Inoperable When Jacket Cooling Water Boiled Out During Surveillance Test.Caused by Abnormally High Operating Temp, Due to Malfunctioning Hx.Hx Cleaned & Repaired

ML20062N183
Person / Time
Site:	Duane Arnold
Issue date:	08/12/1982
From:	Mineck D IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
DAEC-82-543, RO-82-1, NUDOCS 8208230037
Download: ML20062N183 (2)

Text

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,u Iowa Electric l.ight and ther Company August 12, 1982 DAEC 543 l

l Mr. James G. Keppler Regional Administrator Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 1

Re: Duane Arnold Energy Center i

Subject:

Unique Report 82-1 File: A-ll8, NRC-1

Dear Mr. Keppler:

This report is submitted in accordance with the requirements of Appendix A to Operating License DPR-49, Specification 6.11.3.

Problem On July 6,1982, diesel fire pump IP-49 was declared inoperable when the jacket cooling water was lost following 30 minutes of pump operation for a weekly surveillance test. The closed-circuit jacket cooling water boiled out through a relief valve less.than 2 seconds after the diesel fire pump was secured, apparently from abnormally high engine operating temperature.

Electric fire pump 1P-48 was demonstrated operable inanediately. and daily thereafter in accordance with Technical. Specification 4.13.B.2, with the .

exception that IP-48 was inadvertently not demonstrated operable for three l days (July 15-17,1982) while diesel fire pump 1P-49 was inoperable. Diesel fire pump 1P-49 was made operable after 13 days, on July 19, 1982. This 13-day period exceeded the 7 days.specified by Technical Specification 3.13.B.2..

The plant was in cold shutdown during the time that diesel fire pump 1P-49 was inoperable.

Cause The abnormally high diesel. engine operating temperature was caused by a malfunctioning jacket cooling water heat: exchanger. The 13-day diesel fire pump downtime included troubleshooting the overheating problem, repairs to

.the heat exchanger, and the performance of annual maintenance items. The troubleshooting required the use of two test rigs whose fabrication required several days.

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Mr. James G. Keppler August 12, 1982 Page 2 Investigation into the root cause of the f ailure to perform serveillance on the three days as specified above is continuing.

Corrective Action The diesel fire pump jacket cooling water heat exchanger was cleaned and one leaking tube was plugged. A new thermostat was installed and all annual maintenance items were checked. Parts replaced include the oil, oil filter, fuel filter, coolant, coolant filter, and coolant hoses. After the maintenance and repairs were completed, diesel fire pump 1P-49 was functionally tested satisfactorily.

Because the diesel engine still runs at the high end of the acceptable operating temperature range, a design review of the adequacy of cooling water flow to the shell side of the jacket cooling water heat exchanger will be performed.

Appropriate personnel have been reinstructed on the procedural controls that assure that surveillance requirements are met for inoperable equipment.

Additional corrective action as determined by further investigation will be implemented as appropriate and an update report will be submitted by August 31, 1982.

This report has been reviewed.by the DAEC Operations Committee.

Very truly yours,

'7 Daniel L. Mineck Plant Superintendent - Nuclear Duane Arnold Energy Center DLM/DMV/pl Docket No. 50-0331 cc: Resident NRC Inspector - DAEC 8

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