ML18079A314
| ML18079A314 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 05/15/1979 |
| From: | Mittl R Public Service Enterprise Group |
| To: | Parr O Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7905220349 | |
| Download: ML18079A314 (2) | |
Text
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3 Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /430-7000 May 15, 1979 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, D. c.
20555 Attentio:p:
Gentlemen:
Mr. Olan D. Parr, Chief Light Water Reactors Branch 3 Division of Project Management ROD DROP ANALYSIS UNREVIEWED SAFETY QUESTIONS NO. 1 AND NO. 2 UNITS SALEM NUCLEAR GENERATING STATION DOCKET NOS. 50-272 AND 50-3ll On March 28, 1979, Westinghouse notified the NRC, under 10 CFR 50.59, of the potential of certain single dropped rod events which could lead to calculated DNB ratios lower than reported to the NRC for certain *classes of Westinghouse plants.
This is discussed in detail in the letter NS-TMA~2063 dated March 30, 1979 from Westinghouse to John G. Davis, Acting Director of Inspection and Enforcement.
Salem Units 1 & 2 are four loop plants and do not have the potential problem as indicated in this letter since its design incorporates an auctioneering system which uses the highest output signal as input to the rod control system.
This design feature prevents the power overshoot and is more conservative as compared to the older design in which the flux signal is derived by averaging the signals from all NIS channels.
- The Energy People 95-2001 (400M) 9-77
Mr. Olan D. Parr, Chief May 15, 1979 Page 2 Should you have any further questions related to the above subject, please do not hesitate to contact us.
RJ?7.
R. L. Mittl General Manager -
Licensing and Environment Engineering and Construction
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