ML20076D082
| ML20076D082 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 05/18/1983 |
| From: | Wuller G ILLINOIS POWER CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| L30-83(05-18)-L, L30-83(5-18)-L, U-0637, U-637, NUDOCS 8305200667 | |
| Download: ML20076D082 (1) | |
Text
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IIHfilois Power Company
$o_637 s3c05-18)-t 500 SOUTH 27TH STREET, P. o. BOX 511, DECATUR, ILLINOIS 62525-1805 Docket No. 50-461 May 18, 1983 Director of Nuclear Reactor Regulation Attention:
Mr. A.
Schwencer, Chief Licensing Branch No. 2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Schwencer:
Reference:
1)
Letter 3/26/82, J. R. Miller (NRC) to L. J. Koch (lP), " Fast Scram Loads on Control Rod Drive Systems" 2)
Letter 9/24/82, (U-0552) G. E. Wuller (IPC) to C. D. Thomas (NRC), "Clinton Power Station Unit 1" The reference 1 letter requested information on the hydro-dynamic water hammer analysis of the Control Rod Drive (CRD)
System for Clinton Power Station.
We provided the requested information in the reference 2 letter.
We reported in the reference 2 letter that the design basis opening time for the inlet scram valve (V126) is twenty milli-seconds (20 ms).
Based on additional analysis and test data available since that time, we have determined that a forty-five millisecond (45 ms) valve opening parameter more appropriately models the valve hydraulic response.
Therefore, the design basis opening time for the inlet scram valve is forty-five milliseconds.
The remainder of the reference 2 response is unchanged.
Sincerely, J
G. E. Wuller Supervisor, Licensing Nuclear Station Engineering PEW /lt cc:
Dr. H. Abelson, NRC Clinton Project Manager Mr. H. H. Livermore, NRC Resident Insp;ctor Illinois Department of Nuclear Safety
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8305200667 830518 PDR ADOCK 05000461 A