ML20214S823
| ML20214S823 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/16/1977 |
| From: | Switzer D NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | Lear G Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20214S825 | List: |
| References | |
| TAC-7317, TAC-7321, TAC-7420, TAC-7546, TAC-8169, TAC-8631, NUDOCS 8706090460 | |
| Download: ML20214S823 (3) | |
Text
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o' Y PO DOf ?i3 UARTFOND CONNEC itGuT mi in NORTHEAST NUCLEAR ENERGY COMPANY mos wii A NORIHEAST UTILITIES COMPANY December 15, 1977 Docket No. 50-336 Director of Nuclear Reactor Regulation Attn : Mr. G. Lear, Chief Operating Reactors Branch #3 U. S. Nuclear Regulatory Commission Washing ton, D. C.
20555
Reference:
(1)
B. H. Grier letter to D. C. Switzer dated November 4, 1977.
Gentlemen:
Millstone Nuclear Power Station, Unit No. 2 Proposed Revisions to Technical Specifications Pursuant to 10CFR50.90, Northeast Nuclear Energy Company (NNECO) hereby proposes to amend its operating license, DPR-65, by incorporating the following proposed revisions into the Millstone Unit No. 2 Technical Specifications:
On Page 3/4 5-5, increase the minimum required amount of trisodium phosphate dodecahydrate l(TSP)F in Item 4.5.2.c.3 as shown in Attach-ment 1.
In Reference (1), NNECO was informed of the NRC's concern that calculations deter-mining minimum requirements for TSP may not have been based on the maximum boron concentrations and water volumes that could be postulated. Our review of the original calculation has indicated that minimum water volumes and boron concen-trations were assumed.
A more conservative calculation has been completed. This analysis assumed maxi-mum water volumes and boron concentrations of 2400 ppm for the Refueling Water Storage Tank, Safety injection Tanks, and the Reactor Coolant System, and 21,000 ppm for the Boric Acid Tanks. Administrative controls have been implemented to limit the boron concentrations to a level below these maximum values. As a result of the higher assumed boron concentrations, the volume of TSP must be increased from the current technical specification minimum of 65 cubic feet to slightly less than 110 cubic feet to ensure adequate pH control of the containment sump water during a LOCA. To allow for spillage and settling of the TSP, a total capacity of 125 cubic feet will be installed. This proposed specification ensures that, post-LOCA, the pH of the water will be greater than 7.0, thereby minimizing the possibility of corrosion cracking of certain metal components during operation of the ECCS.
8706090460 771216 PDR ADOCK 05000336 p
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.' This proposed change has been reviewed pursuant to 10CFR50.59 and has not been found to constitute an unreviewed safety question.
The Millstone Unit No. 2 Nuclear Review Board has reviewed and approved the above proposed change and concurred in the above determination.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY LG, 2 t,
t D. C. Switzer f
President Attacinnent I
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i STATE OF CONNECTICUT COUNTY OF HARTFORD
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/4 N Then personally appeared before me D. C. Switzer, who.being duly sworn, i
did state that he is President of Northeast Nuclear Energy Company, a Licensee herein, that he is authorized to execute and file the foregoing information in the name and on behalf of the Licensees herein and that the statements contained in said information are true and correct to the' best of his knowledge and belief.
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Notary Public c
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