ML20127G784

Discusses Concern Re Util Installation of RPT Sys as Part of Addl Protection for Postulated ATWS Events at Plant & Reiterates That,For Plant,Relays Are Only Components for Which Such Functional Diversity Required

ML20127G784
Person / Time
Site:	Monticello
Issue date:	01/13/1978
From:	Goller K Office of Nuclear Reactor Regulation
To:	Mayer L NORTHERN STATES POWER CO.
References
NUDOCS 9211170427
Download: ML20127G784 (3)

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DISTRIBUTION DEisenhut focket NRC PDR TBAbernathy Local PDR JRBuchanan Docket No. 50-263 yn 131976 -ORB #2 Reading ACRS (16)

DKDavis RPSnaider Worthnern States Power Company - ,

.s gg3 ATTH: Mr. L. O. Mayer, Manager L01 shan Nuclear Support Services ' ^

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414 Mico11et Mall - Eighth Floor Hinneapolis Minnesota 55401 01&E(3)

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PShemanski- -

By letter to you dated October 14, 1977, we addressed a specific concern -

regarding your installation of the Recirculation Pump Trip (RPT) system as part of additional protection for postulated Anticipated Transients Without Scram (ATWS) events at the Monticello Nuclear Generating Plant.

We requested that you utilize relays of a dif ferent manufacturer than those installed in your Reactor Protection System, in order that a comon node failure would not occur.

You responded by letter dated November 30, 1977, in which you stated that the functional diversity requirement for the RPT would be met through

" functionally opposite application of the relays." You also stated that any nodification of this sort would require extensive redesign under revised criteria.

In subsequent telephone conversations with your staff, we determined that your interpretation of our requirements was that the functional diversity

, of all components was in ouestion, when in fact we had specifically addressed only relays.

In clarification of our recuirements, we reiterate that, for Monticello, and at this time, the re',ays are the only components for which such functional diversity is required and for which the installation of eouip-nent provided by different manufacturers is desired. Further, the NRC staff is considering other RPT criteria, but those reoutrements will not be applied to Monticello at the present time. Monticallo will be A"

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Northern States Power Company J g y 3 9973 reviewed against these reouirements at a later time and in accordance with then-established priorities. However, these requirecents, when fonnalized, vill definitely apply to other Boiling Water-Reactors in which the RPT ~

system has not been installed. , .:"J-.

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Northern States Power Company January 13, 1978 CC:

Gerald Charnof f, Esquire The Environmental Conservation Library Shaw, Pittman, Potts and Minneapolis Public Library Trowbridge 300 Nicollet lia11 1800 fi Street, N. W. Minneapolis, Minnesota 55401 Washington, D. C. 20036 Arthur Renquist, Esquire Vice President - Law Northern States Power Company 414 Nicollet Mall tiinneapolis, tiinnesota 55401 Mr. L. R. Eliason Plant fianager Monticello !!uclear Generating Plant florthern States Power Co.npany Monticello, Minnesota 55362 Russell J. Hatling, Chaiman Minnesota Environmental Control

. Citizens Association liECCA)

Energy Task Force 144 fleibourne Avenue, S. E.

Minneapolis, Minnesota 55414 Mr. Kenneth Dzugan Environnental Planning Consultant Of fice of City Planner Grace Building 421 Wabasha Street St. Paul, !!innesota 55102 Sandra S. Gardebring Executive Director Minnesota Pollution Control Agency 1935 W. County Road B2 Roseville, Minnesota 55113 Mr. Steve Gadler 2120 Carter Avenue St. Paul, Minnesota 55108 Anthony 2. Roisman, Esquire Sheldon, Harmon & Roisman 102515th Street, N. W., 5th Floor

'lashington, D. C.

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