ML20138C086

Clarifies Method Used to Assure Facility Could Be Safely Shut Down After Postulated Moderate Energy Line Break in Areas Outside Containment.Safe Shutdown Achieved Through Use of Separated Redundant Equipment

ML20138C086
Person / Time
Site:	Clinton
Issue date:	03/31/1986
From:	Spangenberg F ILLINOIS POWER CO.
To:	Butler W Office of Nuclear Reactor Regulation
References
U-600502, NUDOCS 8604020201
Download: ML20138C086 (1)

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U -600502 L30 - 86(03-31)-L 1A.120 ILLINOIS POWER 00MPANY CLINTON POWER STATION P.o. BOX 678. CLINTON. ILLINOIS 61727 Docket No. 50-461 March 31, 1986 Director of Nuclear Reactor Regulation Attention: Dr. W. R. Butler, Director BWR Project Directorate No. 4 Division of BWR Licensing U.S. Nuclear R dulatory Commission Washington, DC 20555

Subject:

Clinton Power Station Moderate Energy Line Break Safe Shutdown Analysis

Dear Dr. Butler:

During a discussion with a member of the NRC Staff, clarification was requested on the method used to assure that Clinton Power Station-(CPS) could be safely shut down after a postulated moderate energy line break (MELB) in areas outside containment where a high energy line break (HELB) is not postulated.

The existing analyses have been reviewed and show that the plant can be safely shut down in the event of a postulated MELB. In performing these analyses, instrumentation which was assumed to be sprayed from a postulated MELB was conservatively assumed not to

-function. Safe shutdown is achieved through the use of separated redundant equipment or the use of equipment which is qualified for spray from a postulated MELB.

If you need any further information, please contact me.

Sincerel yours, I r F. A. pang 1 berg Manager - L: censing and Safety DWW/kaf cc: B. L. Siegel, NRC Clinton Project Manager NRC Resident Office Regional Administrator, Region III, USNRC Illinois Department of Nuclear Safety l

8604020201 860331 ,A PDR ADOCK 05000461 l A PDR -h U 1

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