ML20209E250
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'f UNITED sTAYEs
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g NUCLEAR REGULATORY COMMISSION 3
j WASHINGTON. D. C. 20655 s
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f APR 9'1985~
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MEMORANDUM FOR: James P. Knight, Assistant Director for Components and Structures'Englaeering, Dfvision of Engineering i
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,d FROM:
,L.S.,Rubehsteid, Assistant, rector for Core and Plant Systems, Division of Systems' Integration f
SUBJECT:
DIABLO CANYON UNIT 2 - A53 EVALUATION OF EQUUNENT QUALI-FICATION FOR A MSLB OUTS 1DE CONTAINMENT
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- o Enclosed is our evaluation of the applicant's re-analysis of the compartmental temperature response due to a main steam line break outside of containment.
The applicagUs re-analysis was necessitated when Westinghous9 produced revised
, infomation involvino; mass / energy release rates for a main steam line break.
Main steam' lice breaks may uncover the steam.generatur. tuber,which can result
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in superhtated > steam being discharged into the compartmnts; The applicant's original analysis only addresses saturated steam.
t Based on the enclosed tvaluation, we conclude that tne app 11 cant'has demon-strated '. hat '.mcovering the steam generator tubes at Diablo Canyon, Unit 2 produces an insignificant amgnt of superheated steam. Therefore, the original ceopactrantal temperature response for saturated steam' remains valid.
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sL. S. Rubenstein, Assistant Director
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for Core?and Plant Systems j ! gs 1
Division of' Systems Integration a
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Enclosure:
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As Stated cc: See next page s
Contact:
A P. Hearn.
X29461 4
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2-APR 9 G35 cc w/ enclosure:
R.-Bernero
- 0. Parr V. Noonan W. Butler B. Sheron
- J. Wilson J. Wemiel R. LaGrange
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H. Walker W. Jensen C. Li H. Shierling
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.D. Wigginton P. Hearn
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