ML20132G899
| ML20132G899 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 09/17/1985 |
| From: | Diederich G COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8510020004 | |
| Download: ML20132G899 (1) | |
Text
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Commonwmith Edison O
) LaSalle County Nuclear Station Rural Route #1, Box 220 V
Marseilles, Illinois 61341 Telephone 815/357-6761 PRIORITY EC'JIING September 17, 1985 f 'L_D W L-
,3 Mr. James G. Keppler b
6[
Regional Administrator Ed5 Region III d
U.S. Nuclear Regulatory Commission FItus 799 Roosevelt Road Glen Ellyn, Illinois 60137 1
Dear Mr. Keppler:
This special report is being submitted in accordance with Technical Specifica-tions 3.7.7_ Action a and 6.6.6.c and the C. W. Schroeder to J. G. Keppler letter dated December 22, 1983, regarding LaSalle Unit 1 Drywell temperature.
The above letter established individual temperature limits for several of the key pieces of equipment in the Unit 1 drywell.
It was determined on August 20, 1985, that the 173 F temperature limit for the SRV solenoids was misinterpreted as an ambient air temperature when it in fact was intended as the metal housing temperature.
The 173 F metal housing temperature corresponds to a 150 F ambient air tempera-ture based on actual operating data. A review of all available temperature data determined that the ambient air temperature in the vicinity of the SRV solenoids exceeded the 150 F temperature limit on several occasions during 1984. Existing data indicates temperatures above 150 F may have existed during periods of operation from January 12, 1984 to May 14, 1984; May 22, 1984 to July 11, 1984; July 17, 1984 to July 23, 1984; and July 25, 1984 to August 30, 1984.
In addition, temperatures in excess of 150 F have existed since August 8, 1985. Since no data on the temporary monitoring system is available for the period from December 27, 1984 to August 8, 1985, it is not known how long the current high temperatures have existed.
A conservative analysis of all available temperature data indicated that the SRV solenoids have a NUREG 0588 Category II remaining life of about 1h years assuming that the current high temperature conditions continue to exist.
During the upcoming Unit 1 refueling outage, attempts will be made to return the SRV solenoid temperatures to within established limits, cL2 9 G. J. Diederich j
Station Manager LaSalle County Station GJD/KCW/DRR/kg Enclosure xc: NRC Resident Inspector INPO - Records Center
,h{p 231985 i 0 US NRC Document Control Desk I
8510020004 850917 i
PDR ADOCK 05000373 S