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
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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 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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