ML19347B154
| ML19347B154 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 08/27/1980 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-19, SBN-134, NUDOCS 8010010697 | |
| Download: ML19347B154 (1) | |
Text
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/ i er l Compar1yof PUBLIC SERVICE New Hampshir e SEA 8 ROOK STATION Engineering Office:
20 Turnpike Road Westborough, MA 01581 August 27, 1980 SBN-134 i T.F. B 4.2.5 )
i U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention: Office of Inspection and Enforcement i
Reference:
- 1. Docket No. 50-443 and 50-444
- 2. NRC letter dated July 31, 1980
- 3. NRC letter dated August 15, 1980
- 5. IE Bulletin No. 80-19, Revision 1
Subject:
Failures of Mercury-Wetted Matrix Relays in Reactor Protective System of Operating Nuclear Power Plants Designed by Combustion l Engineering
Dear Sir:
The only application of Mercury-Wetted relays in reactor trip circuitry at Seabrook Station is in the 7300 protection system equipment. These relays are hermetically sealed and not used in matrix logic applications. They are ,
used for temperature channel test inputs from resistor thermal devices and I not used in scram circuits. j If you require further information, please do not hesitate to contact us.
1 Very truly yours, l
%'w 1
John DeVincentis i Project Manager j DAM: tan i
cc: Director Division of Reactor Operations Inspection Office of Inspection and Enforcement Nuclear Regulatory Commission Washington, D.C. 20555 801001-0077 Q
.