Additional Information RE 11/09/79 Letter On ECCS Calculations (Generic Letter 79-66)
GL79066
UNITED STATES
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D.C. 20555
November 27, 1979
(LETTER TO ALL OPERATING LIGHT WATER REACTORS)
Gentlemen:
Letters, dated November 9, 1979, were sent to all the licensees requesting
information concerning the new fuel cladding strain and fuel assembly
blockage models and compliance with 10 CFR 50.46. Subsequently further
infornation was provided by the NSSS vendors and fuel suppliers regarding
the impact of cladding heating-rate dependent burst temperature effects on
rupture time and rupture strain/blockage and consequently on calculated peak
cladding temperatures. The vendors and fuel suppliers supplied additional
information by letters to the staff.
Copies of these additional letters are enclosed. This new information should
be used in preparing your response to the November 9, 1979 request.
Sincerely,
Darrell G. Eisenhut, Acting Director
Division of Operating Reactors
Enclosures:
1. Letter from Babcock & Wilcox, dated November 20, 1979
2. Letter from Combustion Engineering, dated November 16, 1979
3. Letter from Exxon Nuclear Co., dated November 16, 1979
4. Letter from General Electric Co., dated November 16, 1979
5. Letter from Westinghouse Electric Co., dated November 16, 1979
6. Letter from Yankee Atomic Electric Co., dated November 20, 1979
80 010703-276
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