ML20041C394

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Forwards Large Break Loca/Eccs Performance Results W/Addl Plugged Steam Generator Tubes.
ML20041C394
Person / Time
Site: Millstone Dominion icon.png
Issue date: 02/19/1982
From: Counsil W
NORTHEAST NUCLEAR ENERGY CO.
To: Clark R
Office of Nuclear Reactor Regulation
Shared Package
ML20041C395 List:
References
B10425, TAC-47355, TAC-47389, TAC-47473, TAC-47577, NUDOCS 8203010275
Download: ML20041C394 (2)


Text

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February 19, 1982 g '4 4,

Docket No. 50-336 2- . ..

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.D '*U B10425

% FEB23 Iggy a U/M.!Crn re,um 0 4i aM:2a TCC Director Nuclear Reactor Regulation 8 Attn: Mr. Robert A. Clark, Chief Operating Reactors Branch #3 hg / y #

U. S. Nuclear Regulatory Commission Washington, D.C. 20555 i

References:

(1) W. G. Counsil letter to R. A. Clark, dated February 4, 1982.

(2) W. G. Counsil letter to R. A. Clark, dated December 2, 1981.

Gentlemen:

Millstone Nuclear Power Station, Unit No. 2 Large Break LOCA/ECCS Performance Results With Additional Plugged Steam Generator Tubes In Reference (1), Northeast Nuclear Energy Company (NNECO) informed the NRC Staff of the continued validity of the results of the non-LOCA transient analyses and the small break LOCA analysis with additional plugged steam generator tubes for Millstone Unit No. 2.

The large break LOCA/ECCS performance analysis with additional plugged steam generator tubes has been completed and is provided in Attachment

1. These results have been QA verified by Westinghouse, the Cycle 5 fuel supplier.

The analyses presented herein were performed assuming 800 plugged tubes per steam generator. The results show the double-ended cold leg guillotine (DECLG) break at the pump discharge to be the limiting large break. The maximum clad temperature calculated for the DECLG large break was 2045 F and the maximum local and core-wide metal-water reactions were calculated to be 4.4 and 0.3 percent, respectively. These values are within the acceptance criteria established in 10CFR50.46.

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O d . gr NNECO has reviewed these results pursuant to the requirements of 10CFR 170 and has determined that the applicable fee has been previously transmitted to the NRC Staff in Reference (2).

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY

, $l14l4 W.'G. Counsil Senior Vice President i

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