ML20004B697

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Submits Reactor Vessel Pressurized Thermal Shock Info in Response to 810420 Ltr.Program to Address Vessel Integrity Concerns Scheduled for Consideration at 810604 Meeting
ML20004B697
Person / Time
Site: Millstone Dominion icon.png
Issue date: 05/22/1981
From: Counsil W
NORTHEAST UTILITIES
To: Eisenhut D
Office of Nuclear Reactor Regulation
References
A01665, A1665, TAC-46893, NUDOCS 8105290307
Download: ML20004B697 (2)


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NORTHEAST UTIIJTIES w aw. u,.r.o.v e nw n ** P o. Box 270 U,CN.N.I[ CEm, HARTFoRo. CONNECTICUT 06101

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May 22, 1981 Docket No. 50-336 A01665 Mr. Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555

References:

(1) D. G. Eisenhut letter to All Licensees of Operating PWR Nuclear Power Plants, Generic Letter 81-19, dated April 20, 1981.

(2) K. P. Baskin letter to D. G. Eisenhut, docketed May 15, 1981.

Gentlemen:

Millstone Nuclear Power Station, Unit No. 2 Reactor Vescel Pressurized Thermal Shock In Reference (1) , the NRC Staff identified concerns related to thermal repressurization transients and their effects on reactor vessel in-tegrity for pressurized water reactors (PWR). Reference (1) requested that each licensee provide the Staff with the specific actions which they propose to undertake to resolve these concerns for their facility.

l To this effect, Northeact Nuclear Energy Company (NNECO) hereby pro-l vides the following information for Millstone Unit No. 2.

l The Combustion Engineering Owners Group, of which NNECO is a member, l commissioned CE to develop a program to address the potential reactor I vessel integrity concerns as identified in Reference (1). A proposed program is currently under review by the Owners and has been submitted to the Staff in Reference (2). The Reference (2) program is scheduled

! for consideration for authorization by the CE Owners Group at a meeting on June 4, 1981. At this time, it is NNECO's intention to authorize the Reference (2) program for Millstone Unit No. 2.

l 8105n80307 3 1

f As was discussed in Reference (2), approximately five more effective full power years of operation would have to elapse before vessel integrity during a pressurized thermal shock transient coald theo-retically become a concern for Millstone Unit. No. 2. This is based on conservative assumptions for vessel cooldown and radie. tion fluence as discussed in Reference (2).

Additional information concerning the program schedule will be docketed upon its availability.

We trust you find this information responsive to the Reference (1) requests.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY

/ 7

- 'ML@

W. G. Counsil Senior Vice President

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