ML20058K991

Forwards Permanent Plant Changes to Accommodate Equilibrum Core Scram Reactivity Characteristics, Which Provides Bases for Adoption & Implementation of Listed Changes & Mods During Spring Refueling Outage

ML20058K991
Person / Time
Site:	Monticello
Issue date:	01/23/1974
From:	Mayer L NORTHERN STATES POWER CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20058K994	List: ML20058K991 ML20058L004
References
NUDOCS 9105070343
Download: ML20058K991 (2)

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Dear Mr. O' Leary:

MONTICELLO NUCLEAR GENERATING PIRiT Docket No. 50-263 License No. DPR-22 Permanent Plant Changes to Accommodate Equilibrium Core Scram Reactivity Characteristics he attached t sport uitled "Pemanent Plant Changes to Accommodate Ec.uilibrium Core Scram Reac- ity Chr.racteristics, January 1974" provides bases for adoption and implementation of the following proposed changes and modifi- k cations during the Sprag 1974 refueling outage. ,

1. Installation of a Prompt Relief Trip System

2. Replacement of spring safety valves with combination safety relief valves.

3. Adoption of morc realistic control rod scram times in the Techrical Specifications.

This submittal is supplementa.y to the "Second Reload Submittal" dated Nove=ber 19, 1973 in that it 1,rovides reanalysis of all pertinent transients for a mir.ed core of 7 x 7 and 8 x 8 fuel and the proposed modifications.

C Also included in Appendix B of this submittal is a detailed discussion on the concept of Design and Operational Consenatism Factors (DCF/OCF).

l l The required Technical Specification changes will be formally submitted in the near future.

We have concluded that the proposed modifications do not involve an unreviewed safety question, he Montic allo Operations Comittee and Safety Audit Committee have revi - eed the submittal

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N O R*. ERN STATES POWER CO. 'ANY Mr. J F O' Leary January 23, 1974 Page 2 Our outage has been rescheduled to cormence on March 15, 1974 and is expected to conclude within two months of that date. Ik shall appreciate establishment of a review schedule which will permit resumption of plant operation as planned.

Yours very truly, d o.

L 0 Mayer, PE

. Director of Nuclear Support Services LOM/DWJ/kn ec: J G Keppler G diarnoff Minnesota Pollution Control Agency

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