ML20076D082

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Submits Updated Info to 820924 Response to 820326 Request for Addl Info Re Fast Scram Loads on Control Rod Drive Sys. Test Data Revealed That 45-ms Valve Opening Parameter More Appropriately Models Valve Hydraulic Response
ML20076D082
Person / Time
Site: Clinton Constellation icon.png
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_637s3c05-18)-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 PDR