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 PUBLIC SERVICE Compar1yof 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 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 4.
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 not used in scram circuits.
j If you require further information, please do not hesitate to contact us.
Very truly yours,
%'w John DeVincentis 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
.