ML20080K268
| ML20080K268 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 02/08/1984 |
| From: | Diederich G COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8402150352 | |
| Download: ML20080K268 (3) | |
Text
_ _ _ _
N) Commonwealth Edison LaSails County Nuclear Station O
Rural Route #1, Box 220
-V Marseilles, Illinois 61341 Telephone 815/357-6761 February 8, 1984 Mr. James G. Keppler Reraional Administrator Region iII
[
U.S. Nuclear Regulatory Commission 799 Roosevelt Road l
Glen Ellyn, IL 60137
Dear Sir:
l This special report is submi tted in accordance wi th LaSalle Unit 1 Ooeratina l
License NPF-11, Appendix A, Technical Specifications 3.7.7 and 6.6.c.
This letter supplements the soecial report submi tted on January 16,198'i.
Between December 16, 1983, and January 1, 1984, the 0, 1A, 2A, and IB Diesel Generator Rooms and U-2 Division 1 Switchgear Room temperatures were outside the limits of Unit 1 Technical Speci fication 3.7.7.
A soecial lon of ambient i
room temperatures was measured hourly. Table 1 Indicates the amount by which the 65 F limit was exceeded and the cumulative time the temperature in the affected area exceeded the Ilmit.
The U-l Technical Soecification reauires a minimum room te nperature of 65 F and a maximum of 122 F (or maximum of 104 e for the Switchaear Room) when the serviced equipment is not oneratina. The Unit 2 Technical Specification, however, has a 50 F minimum for the 0, 2A. and j
1A Diesel Generator Rooms and the U-2 Division 1 Switchaear Rooms. This event l
occurred while LaSalle Unit I was in Cold Shutdown and during severe outside weather condi tions. At no time did the temperatures in the affected areas drop to less than 40 F (25 F below the limit of Table 3.7.7-1) and no equip-ment was declared inoperable due to low temoeratures.
An analysis by Sargent & Lundy has been performed as required by Technical l
Specification 3.7.7 All of the equipment in the Diesel Generator and Switch-gear Rooms that is safety related or required for safe sbutdown is qualified for operation to a temperature as low as 38 F and the equipment can operate at that temperature without adverse ef fects.
The 125 volt and 250 Volt Division I batteries in the Unit 2 Division I Switchgear Room had their capacities reduc.ed by approximately 20% durina 1
this period, however, this reduction in capacity had no effect on Unit (125 Volt battery only required for closing the AC unit crosstie breaker) or on Unit 2 which was in re fueling mode.
The rooms' temperature changes were aradual which precludes condensation inside equipment located in these areas, 8402150352 840200 PDR ADOCK 05000373 S
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D Mr. James G. Keppler February 8, 1984 From weather data sumnaries collected by Murray & Trettel Inc. for the period in question, the outside air dewpoint temperature never exceeded the inside drybulb temperatures.
Consequently, there was no possibility of incipient condensation forming on the equiprent inside the Diesel Generator or Switchaear Rooms.
The primary cause of low room temperatures in the Diesel Generator Rooms was due to leakage around the exhaust ducts.
This resulted in a flow of cold air into the Diesel Generator Rooms. The leaks have been sealed and additional station 1. eaters installed in Diesel Generator Room 2A per Modification M-1-2-82-015 and are being installed in the 0, IA, and IB Diesel Generator Rooms per M-1-0-82-069 The cause of the low room temoerature in the U-2 Division I Switchaear Room was due to the failure of 2VX19YA outside air suction damper and 2VX26Y re-circulation damper actuators which reverted to their failed open and failed closed positions respectively.
The dampers were moved to the recirculation mode which has the suction damper closed and the recirculation damper opened.
l l
The temperatures in all the rooms have returned within the ilmits of the Technical Specifications. Work Requests have been written to replace the l
damaged damper actuators.
I l
J A2J G
J. Diederich Superintendent LaSalle County Station GJD/JCR/PSW/rg cc:
LSCS Senior Resident inspector i
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