ML20210C161

Submits Daily Highlight.On 860304,exemption Granted to Allow Util to Perform Necessary Peak Cladding Temp Calculations W/Approved Code & Based on Actual Plant Conditions. Calculations Will Be Completed by 860831

ML20210C161
Person / Time
Site:	05000000, Diablo Canyon
Issue date:	03/04/1986
From:	Schierling H Office of Nuclear Reactor Regulation
To:	Harold Denton, Eisenhut D, Lyons J NRC
Shared Package
ML082840462	List: ML20197J561 ML20197J565 ML20197J706 ML20197J711 ML20197J756 ML20197J770 ML20197J799 ML20197J806 ML20197J819 ML20197J838 ML20197J887 ML20197J893 ML20197J911 ML20197J919 ML20197J925 ML20197J939 ML20197J949 ML20197J973 ML20197J987 ML20197J997 ML20197K022 ML20197K029 ML20197K052 ML20197K055 ML20197K065 ML20197K070 ML20197K126 ML20197K130 ML20197K136 ML20197K144 ML20197K155 ML20197K164 ML20197K170 ML20197K198 ML20197K221 ML20197K228 ML20197K243 ML20198A020 ML20198A192 ML20198A211 ML20198A219 ML20198A225 ML20198A249 ML20198A254 ML20198A262 ML20198A359 ML20198D828 ML20198G197 ML20198G219 ML20198G265 ... further results
References
FOIA-86-197 NUDOCS 8603120086
Download: ML20210C161 (1)

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E WASHINGTON, D. C. 20555 E

March 4, 1980 Docket No. 50-323 MEMORANDUM FOR:

H. Denton R. Houston L. Rubenstein

' D. Eisenhut D. Crutchfield J. B. Youngblood J. Lyons E. Rossi V. Noonan H. Thompson G. Lainas G. Lear F. Miraglia T. Speis C. Berlinger R. Bernero W. Russell G. Holahan V. Benaroya T. Novak J. Milhoan F. Schroeder D. Vassallo THRU:

Steven A. Varga, Director PWR Project Directorate #

Division of PWR Licensing FROM:

Hans E. Schierling, Senior Project Manager PWR Project Directorate #3 Division of PWR Licensing-A

SUBJECT:

DAILY HIGHLIGHT Plant Name Diablo Canyon Unit 2 Exemption A n-Ex emp t ion -h a s-been-g ra n ted-tod ay-fo r-Di a bl o-C a nyon-Uni ttre ga rding1 tie requirement in 10 CFR 50.46(a)(1) that a plant specific ECCS cooling performance analysis must be performed with an approved code which demonstrates that the peak cladding temperature (PCT) limit of 2200*F in 10 CFR 50.46(b) is not exceeded. The heat transfer characteristics of the Unit 2 steam generators are better and the reactor operates with a lower Tavg than was assumed in the original analysis, resulting in a PCT that exceeds the 2200*F limit by about 7 F.

The Exemption was granted to allow the licensee to perform the necessary PCT calculations with an approved code and based on actual pTant operation conditions, which are expected to be completed in late August, 1986. The Exemption is based on the heat flux hot channel factor, Fq, being reduced through administrative control, from the value of 2.32 in the Technical Specifications to 2.30 to assure that the calculated PCT does not exceed 'the 2200*F limit.

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The operational characteristics of Unit 1 are consistent with the analysis and do not require an exemption.

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Hans E. Schierling yft h

) M PWR Project Directorate #3 Senior Project Manager s

Division of PWR Licensing-A f ifr\\

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