ML19210C640
| ML19210C640 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 11/08/1979 |
| From: | Counsil W NORTHEAST UTILITIES |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-03-05.A, TASK-3-5.A, TASK-RR NUDOCS 7911190279 | |
| Download: ML19210C640 (1) | |
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November 8,1979 Docket No. 50-245 Director of Nuclear Reactor Regulation Atta: Mr. D. L. Ziemann, Chief Operating Reactors Branch #2 U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Gentlemen:
Millstone Nuclear Power Station, Unit No. 1 SEP Topic III-5.A High Energy Line Breaks Inside Containment In accordance with the previously established criteria for performing an analysis of SEP Topic III-5.A, "High Energy Line Breaks Inside Containment", the inter-action matrices described in Section 7.3 of the report have been completed.
In those instances where a potentially adverse interaction exists, a specific safe shutdown scenario was developed and is provided in Appendix C.
The evaluation was conducted utilizing the " effects-oriented" approach.
The conclusions resulting from this study are provided in Section 8 of the report and are summarized below. For 346 out of a total of 349 postulated break locations, acceptable consequences result. The three exceptions co this con-clusion involve break locations on Main Steam Line 3, and the resultant potential interaction with the control rod drive system. Various alternatives exist to address this concern, among them a mechanistic evaluation of the interaction.
With the exception of the above interaction which will be the subject of a supplement to this report, Northeast Nuclear Energy Company (NNECO) has concluded that the attached evaluation serves as the basis for resolution of the subject SEP Topic.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY W. G. Counsil Vice President 2 65MC
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