ML19326D206

Notifies That Safety Analysis Will Be Revised to Reflect B&W Changes in Transient Computer Code Specific Heat Curve for U Dioxide Fuel.Elevated Fuel Temps Will Have Higher Specific Heat Values.Revised Safety Analysis to Be Submitted W/Fsar

ML19326D206
Person / Time
Site:	Midland
Issue date:	01/22/1974
From:	Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 8006090630
Download: ML19326D206 (2)

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General Omces. 212 West Micnigan Avenue. Jackson. Michsgan 49201 e Area Coce $17 788-0550 January 22, 19'74 MIDIAliD PINIT .-- %

Safety Analyses N Docket Nos 50-329 and 50-330 , ,

Mr. A. Giambusso, Deputy Director Reactor Projects

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Dear Mr. Gianbusso:

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e/r[TiB Babcock & Wilcox has notified us oI a change they are making in the specific heat curve for UO2 fuel as utili::ed in some of their transient computer codes. This change will be reflected in the higher value of the specific heat for elevated fuel temperatures.

The studies necessary to quantify the i= pact that this revi-sion may have on the safety analyses reported in the Preliminary Safety Analysis Report are under way. The general effect will be a change in the level of stored energy of fuel as well as in the time response of some transients. 3ased on Babcock & Wilcom's present evaluation, this revision will not affect the steady state analysis because the basic data from which the curve is derived are valid. It is these basic data that are used for the steady state calculations. The particular effect on kinetic behavior is determined only by an evaluation of the safety analyses. To indicate the magnitude of this revision, preliminary calcu-lations on Oconee 2 show that a reduction in the maximum linear heat rate of less than 1.0 MT/ft should offset the effects of this cir.nge in the specific heat.

We will revise the safety analyses to reflect these changes and submit the revised analyses with the Final Safety Analysis Report. We understand that 3abcock & Wilcox will be discussing this information with you on a generic basis in an effort to keep you fully informed of further developments.

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" AEC P"9TRIEUTION FOR P ART 50 DOCKET P'7 RIAL (TD!PORARY F0Tdi) CONTROL NO: 720 FILE:

4 FROM: DATE OF DOC DATE REC'D LTR MD10 RPT OTHER Consumers Power Company Jackson, Michigan Stephan H. Howell 1-22-74 1-25-74 X TO: ORIG CC OTHER SENT AEC PDR XXX A Giambusso 1 signed CLASS UNCLASS PROP INFO IITPUT NO CYS REC'D DOCKET NO:

XXX 1 " 30 DESCRIPIION: ENCLCSU?SS:

Ltr advising that, changes in the specific heat curve for UO2 fuel will be submitted TA N0i L.sm ,/2 with the FSAR ---

PLANT NAME: MIDLAND UNITS 1 & 2

%CKNOWLEDGED FOR ACTION /INTOM'.ATION 1-28-74 GMC BUTLER (L) SCIL'ENCER(L) ZIDIANN(L) REGAN(E)

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