ML20052G448
| ML20052G448 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 05/12/1982 |
| From: | Tramm T COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8205180366 | |
| Download: ML20052G448 (2) | |
Text
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\\ Commonwealth Edison C
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) One First National Plaza, Chicago. Ilknois C ] Address Reply to: Post Office Box 767 y Chicago, Illinois 60690 May 12, 1982 Mr. Harold R. Denton, Director Of fice of Nuclear Reactor Regulation U.S.
Nuclear Regulatory Commission Washington, DC 20555
Subject:
Byron Station Units 1 and 2 Braidwood StationUnits 1 and 2 Testing o f P-4 Interlock NRC Docke t Nos. 50-454, 50-455, 50-456 and 50-457 Reference (a):
January 26, 1982, letter from T.R.
Tramm to H. R. Den to n.
4
Dear Mr. Denton:
This is to provide information regarding the testing o f P-4 interlocks in the Reactor Protection Systems at Byron and Braidwood Stations.
Prompt review of this information should close out.
Confirmatory Issue 24 of the Byron SER.
In a meeting with the NRC Staff on November 12 and 13, 1981, we agreed to install test jacks to facilitate the routine testing o f the P-4 interlocks.
This commitment was documented in notes of that meeting which were transmitted in reference (a).
Upon further review we have decided to permanently install voltmeters which can be switched into the cirucit to check the inter-lock inputs.
These additional components will be safety-related and will eliminate the need for temporary connection of portable testing equipment.
Attachment A to this letter contains details of the revised circuit, f
This information will be incorporated into the Byron /
Braidwood FSAR in a revised response to question 031.21.
Please address further questions regardng this matter to this office.
One signed original and fif teen copies of this letter and the attachment are provided for your review and ' approval.
Very truly yours, 30 fi h r[Ah~-
i o
20 5 a. 8 0%Q T.R.
Tramm Nuclear Licensing Administrator 1m Attachment 4102N
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tns During normal plant operation it is required to periodically on line test -(manually) the "P4" interlock which is developed from the reactor trip breaker position inputs.
To provide this test feature, the circuit below has been deve opei.
The test circuit, as shown, monitors the actual contacts from each trip breaker and bypass breaker independently through a qualified double throw (with of f) double pole momentary (spring return) action rotary switch which then is in series with a voltmeter.
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