ML20246K200

Advises That NRC Considers USI A-2, Asymmetric Blowdown Loads on Reactor Primary Coolant Sys, Resolved for Plant, Per Generic Ltr 84-04

ML20246K200
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	07/11/1989
From:	Wang A Office of Nuclear Reactor Regulation
To:	Mroczka E CONNECTICUT YANKEE ATOMIC POWER CO.
References
REF-GTECI-A-02, REF-GTECI-RV, TASK-A-02, TASK-A-2, TASK-OR GL-84-04, GL-84-4, NUDOCS 8907180092
Download: ML20246K200 (4)

Text

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• t UNITED STATES

. ;r ' y NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20655 k July 11. 1989 Docket No. S0-213 i

Mr. Edward J.'Mroczka, Senior Vice President Nuclear Engineering and Operations Connecticut Yankee Atomic Power Company

P.O. Box 270 Hartford, Connecticut 06141-0270

SUBJECT:

HADDAM NECK PLANT - GENERIC LETTER 84-04 " SAFETY EVALUATION CF WESTINGHOUSE TOPICAL REPORTS DEALING WITH ELIMINATION OF P0dTillATED PIPE BREAKS IN PWR PRIMARY MAIN LOOPS" By letter dated February l',1984, the staff issued the subject Generic Letter (GL). GL 84-04 concluded that an acceptable basis had'been provided by Westinghouse Topical Reports so that the asymetric blowdown loads resulting from double ended pipe breaks in main coolant loop piping need not be considered as a design basis for the Haddam Neck Plant, provided the following two conditions are met:

1. Reactor primary coolant main loop piping at-Haddam Neck is acceptable provided the results of seismic analyses confinn that the maximum bending moments do not exceed 42,000 in-kips for the highest stressed vessel nozzle / pipe junction. '

2. Leakage detection systems at the facility should be sufficient to provide adequate margin to detect the leakage from the postulated

, circumferential throughwall flaw utilizing the guidance of Regulatory Guide 1.45, " Reactor Coolant Pressure Boundary Leakage Detection Systems," with the exception that the seismic qualification of the airborne particulate radiation monitor is not necessary. At least one leakage detection system with a sensitivity capable of detecting 1 gpm in 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> must be operable.

By letter dated June 16, 1989, Connecticut Yankee Atomic Power Company (CYAPCO) stated both of the above conditions were met. The staff has reviewed your response and agrees that with the completion of the reactor coolant system seismic modifications as recommended by the Systematic Evaluation Program and the issuance of the leakage detection Technical Specification, CYAPCO has met the two conditions of GL 84-04 and the " leak-before-break" 8907160092 890711

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.Mr. Edward J. Mroczka r philosophy is applicable to-the Haddam Neck Plant. The staff therefore

.- considers Unresolved Safety Issue-A-2, " Asymmetric Blowdown loads on Reactor

, Primary Coolant System" to be resolved for the Haddam Neck Plant. If-you.have any questions or comments please call me at (301) 492-1313.

Sincerely,.

Original sign'ed by ifichael Boyle for Alan Wang, Project Manager Project Directorate I-4 Division of Reactor Projects' 'II Office of Nuclear Reactor Regu dtion '

'cc: See next page DISTRIBUTION

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. Mr. Edward J. Mroczka philosophy is applicable to the Haddam Neck Plant. The staff therefore considers Unresolved Safety Issue A-2, " Asymmetric Blowdown Loads on Reactor Primary Coolant System" to be resolved for the Haddam Neck Plant. If you have any questions or comments please call me at (301) 492-1313.

Sincerely, Original signed by Michael Boyle for Alan Wang, Project Manager Project Directorate I-4 Division of Reactor Projects I/II Office of Nuclear Reactor. Regulation cc: See next page DISTRIBUTION Docket File NRC & Local PDRs Plant File SVarga BBoger SNorris AWang Slee CCheng OGC EJordan BGrimes ACRS(10)

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, Mr. Edward J. Mroczka Connecticut Yankee Atomic Power Company Haddam Neck Plant cc:

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Gerald Garfield, Esquire R. M. Kacich, Manager Day, Berry and Howard Generation Facilities Licensing Counselors at Law Northeast Utilities Service Company City. Place Post Office Box 270 Hartford, Connecticut 06103-3499 Hartford, Connecticut 06141-0270 W. D. Romberg,-Vice President D. O. Nordquist Nuclear Operations Director of Quality Services Northeast Utilities Service Company Northeast Nuclear Energy Company Post Office Box 270 Post Office Box 270 Hartford, Connecticut 06141-0270 Hartford, Connecticut 06141-0270 Kevin McCarthy, Director Regional Administrator l Radiatica Control Unit Region I Departmr.nt of Environmental Protection U. S. Nuclear Regulatory Commission State Office Building 475 Allendale Road Hartforc.,. Connecticut 06106 King of Prussia, Pennsylvania 19406 i

Bradford S. Chase, Under Secretary Board of Selectmen Energy Division Town Hall Office of Policy and Management Haddam, Connecticut 06103 80 Washington Street Hartford, Connecticut 06106 J. T. Shedlosky, Resident Inspector Haddam Neck Plant D. B. Miller, Station Superintendent c/o U. S. Nuclear Regulatory Commission Haddam Neck Plant Post Office Box 116 Connecticut Yankee Atomic Power Company East Haddam Post Office RFD 1, Post Office Box 127E East Haddam, Connecticut 06423 East Hampton, Connecticut 06424 G. H. Bouchard Unit Superintendent Haddam Neck Plant RFD #1 Post Office Box 127E East Hampton, Connecticut 06424 l

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