ML20112H292
| ML20112H292 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 01/02/1985 |
| From: | Rybak B COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 9565N, NUDOCS 8501170064 | |
| Download: ML20112H292 (2) | |
Text
~ N Commonwealth Edison
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' ) One First N1tioral Plaza. Chicago. Illinois C"
Address Riply to: Post Offica Box 767 Chicago, Illinois 60690
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January 2, 1985 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Quad Cities Station Units 1 and 2 125 Volt DC System NRC Docket Nos. 50-254 and 50-265 Reference (a):
B. Rybak letter to H. R. Denton dated August 1, 1984.
Dear Mr. Denton:
In Reference (a), Commonwealth Edison responded to a series of questions concerning the 125 Volt DC System at Quad Cities Station.
In a subsequent telecon additional questions were raised.
Our response is in the form of an attachment to this letter.
If you have any further questions regarding this matter, please contact this office.
One signed original and forty (40) copies of this letter and its attachment are enclosed for your use.
Very truly yours, B. R a
Nuclear Licens g Administrator 1m cc:
NRC Resident Inspector - Quad Cities R. Bevan - NRR Attachment go\\
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9565N 3501170064 850102
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ATTACHMENT Response to Additonal Questions Concerning 125 Volt DC System 1.
Ventilation System Design Temperature
' Original HVAC specification requires the turbine building temperature, where the 125V batteries are located, be maintained between 650F and 1050F.
However, there is a modification underway to maintain a minimum temperature in the batter / rooms of 700F.
This particular modification will be completed in March, 1985.
2.
Battery Cell Temperature Limits There is no temperature at which the batteries are declared inoperative.
3.
Limitations on Battery Testing QTS-120-8 and 9, Quad Cities Units 1 and 2, Battery Test specifically requires in the Discharge procedures respectively,d Unit 2 be in Shutdown and/or prerequisities that both Unit 1 an Refuel ~ Mode.
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