ML20210C178

Submits Daily Highlight.On 860303,exemption Granted from 10CFR50.46(a)(1) Requirement That plant-specific ECCS Cooling Performance Analysis Be Performed W/Approved Code Demonstrating Peak Cladding Temp Limit within 2,200 F

ML20210C178
Person / Time
Site:	05000000, Diablo Canyon
Issue date:	03/03/1986
From:	Schierling H Office of Nuclear Reactor Regulation
To:	Harold Denton, Eisenhut D, Lyons J NRC
Shared Package
ML082840462	List: ML20197J561 ML20197J770 ML20197J806 ML20197J838 ML20197J925 ML20197K029 ML20197K130 ML20197K170 ML20198A211 ML20198A249 ML20198A359 ML20198G484 ML20198G746 ML20210A882 ML20210A891 ML20210A933 ML20210B174 ML20210C114 ML20210C143 ML20210C161 ML20210C178 ML20210C264 ML20215B657 ML20215B671 ML20215B778 ML20215B796 ML20215B801 ML20215B842 ML20215B846 ML20215B851 ML20215B872 ML20215B903 ML20215B906
References
FOIA-86-197 NUDOCS 8603120176
Download: ML20210C178 (1)

Text

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,3 March 3, 1986

2.. ddV Docket No. 50-323 MEMORANDUM FOR:, D. Eisenhut H. Denton R. Houston L. Rubenstein D. Crutchfield J. B. Youngblood J. Lyons E. Rossi V. Noonan H. Thompson G. Lainas G. Lear F. Miraglia T. Speis R. Bernero W. Russell G. Holahan V. Benaroya T. Novak W. Regan F. Schroeder D. Vassallo Steven A. Varga, Directo O THRU:

DivisionofPWRLicensingqA{d PWR Project Directorate (3 0

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 An Exemption has been granted today for Diablo Canyon Unit 2 regarding the requirement in 10 CFR 50.46(a)(1) that. a plant specific ECCS cooling performance analysis must be preformed hith 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 plant operation conditions, which are expected to be completed in late August, 1986.

The Exemptions does not apply to Unit I which operates at conditions closely to those assumed in the original analysis.

k 64.b Hans E. Schierling, Senior Project Manager PWR Project Directorate #3 Division of PWR Licensing-A bl

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