ML20235R984

Forwards Evaluation Re Fast Neutron Fluence & SER Concerning Matl Properties for Fracture Toughness Requirements for Protection Against PTS Events.Periodic Future Reevaluations of Register Temp PTS Requested

ML20235R984
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	10/02/1987
From:	Frank Akstulewicz Office of Nuclear Reactor Regulation
To:	Mroczka E CONNECTICUT YANKEE ATOMIC POWER CO.
Shared Package
ML20235R987	List: ML20235R984 ML20235S006
References
TAC-59957, NUDOCS 8710080254
Download: ML20235R984 (4)

Text

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t A# o,, UNITED STATES l1 8 o NUCLEAR REGULATORY COMMISSION l  :; j w Ass NGTON, D. C. 20655

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Docket No.: 50-213 October 2,1987 Mr. Edward J. Mroczka, Senior Vice President Nuclear Engineering and Operations Connecticut Yankee Atomic Power Company Post Office Box 270  ;

Hartford, Connecticut 06141-0270 '

SUBJECT:

PROTECTION AGAINST PRESSURIZED THERMAL SH0CK EVENTS 10 CFR 50.61 (TAC NO. 59957)

RE: Haddam Neck Plant By letters dated January 23, 1986, April 1, 1987, and August 21, 1987, Connecticut Yankee Atomic Power Company, the licensee for the Haddam Neck Plant, submitted infonnation on the material properties and fast neutron fluence of the reactor pressure vessel in compliance with the requirements of 10 CFR 50.61.

l The staff has reviewed the material submitted with special emphasis on the material properties and chemical composition of the beltline region of the reactor pressure vessel as well as the fast neutron fluence on the inside surface of the vessel. The staff has completed its review and concluded that the Haddam Neck Plant meets the toughness requirements of 10 CFR 50.61 for 32 effective full power years of operation. A copy of our related Safety Evaluation is enclosed. This approval is based on the existence of margin between the projected value of the peak fast neutron fluence on the inside surface of the l pressure vessel and that required to reach the 10 CFR 50.61 screening criteria. '

As described in the Safety Evaluation, the staff was unable to completely quantify the uncertainty in the submitted Haddam Neck Plant evaluation and, therefore, CYAPC0 has committed to upgrade the RTpts evaluation prior to Cycle 17 operation. This commitment is contained in the CYAPC0 .61|letter dated August 21, 1987]]. Guidance and acceptance criteria for fluence estimates will be included in a forthcoming Regulatory Guide.

In addition, we request that the licensee submit periodic future reevaluations of the RTpts and the corresponding comparison with the predictions contained in the CYAPC0 letter dated January 23, 1986. Such submittals could be made at manBMBu8lh3 P

.; Edward J. Mroczka October 2,1987 the same time as the revisions to the Pressure-Temperature operating limits which are required by 10 CFR 50 Appendix G.

Sincerely, original signed by Francis M. Akstulewicz, Jr., Project Manager Integrated Safety Assessment Project Directorate Division of Reactor Projects III/IV/V and Special Projects

Enclosure:

As stated cc: see next page Distribution

Docket File ELJordan

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Edward J. Mroczka October 2,1987 ,

l l the same time as the revisions to the Pressure-Temperature operating limits I which are required by 10 CFR 50 Appendix G.

Sincerely, original signed by Francis M. Akstulewicz, Jr., Project Manager Integrated Safety Assessment Project Directorate Division of Reactor Projects III/IV/V and Special Projects

Enclosure:

As stated cc: see next page Distribution Docket File ELJordan NRC & Local PDR DHagan ISAPD RF JPartlow DCrutchfield EConner FSchroeder TBarnhart (4)

FAkstulewicz LJHarmon MShuttleworth WJones OGC-Bethesda AWang EButcher GPA/PA ACRS (10) LLofs ARM /LFMB PRandall DEST:SRXB DEST /}l/N PM:ISAPD FAkstulewid < i":dr LLois blM. WHod es p/c,l /87 /s/2./87 09/!c/87 - 09/fo/67 0FFICIAL RECORD COPY l

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Mr. Edward J. Mroczka Haddam Neck Plant

• " Connecticut Yankee Atomic Power Company cc: Gerald Garfield, Esquire Kevin McCarthy, Director Day, Berry.& Howard Radiation Control Unit Counselors at Law-- Department of Environmental City Place . Protection Hartford, Connecticut 06103-3499 State Office Building Hartford, Connecticut 06106 Superintendent Richard M. Kacich, Manager Haddam Neck Plant Generation Facilities Licensing RFD #1 Northeast Utilities Service Company Post Office Box 127E Post Office Box 270 East Hampton, Connecticut 06424 Hartford, Connecticut 06141-0270 Wayne D. Romberg Donald O. Nordquist, Director Vice President, Nuclear Operations Quality Services Department i Northeast Utilities Service Company Northeast Utilities Service Department Post Office Box 270 Post Office Box 270 Hartford, Connecticut 06141-0270 Hartford, Connecticut 06141-0270 Board of Selectmen Town Hall Haddam, Connecticut 06103 Bradford S. Chase, Under Secretary Energy Division Office of Policy and Management 80 Washington Street l Hartford, Connecticut 06106 q l

Resident Inspector Haddam Neck Nuclear Power Station c/o U.S. NRC P. O. Box 116 l East Haddam Post Office )

East Haddam, Connecticut 06423 Regional Administrator, Region I U.S. Nuclehr Regulatory Cc"unission 631 Park Avenue King of Prussia, Pennsylvania 19406 l

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