ML19347B154: Difference between revisions

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| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 1
| page count = 1
| project =
| stage = Other
}}
}}


=Text=
=Text=
{{#Wiki_filter:-
{{#Wiki_filter:-
                                                                                                  / i er l Compar1yof PUBLIC                 SERVICE
/ 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
New     Hampshir e SEA 8 ROOK STATION Engineering Office:
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
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:==
==Reference:==
: 1. Docket No. 50-443 and 50-444
1.
: 2. NRC letter dated July 31, 1980
Docket No. 50-443 and 50-444 2.
: 3. NRC letter dated August 15, 1980
NRC {{letter dated|date=July 31, 1980|text=letter dated July 31, 1980}} 3.
: 4. IE Bulletin No. 80-19
NRC {{letter dated|date=August 15, 1980|text=letter dated August 15, 1980}} 4.
: 5. IE Bulletin No. 80-19, Revision 1
IE Bulletin No. 80-19 5.
IE Bulletin No. 80-19, Revision 1


==Subject:==
==Subject:==
Failures of Mercury-Wetted Matrix Relays in Reactor Protective System of Operating Nuclear Power Plants Designed by Combustion                 l Engineering
Failures of Mercury-Wetted Matrix Relays in Reactor Protective System of Operating Nuclear Power Plants Designed by Combustion l
Engineering


==Dear Sir:==
==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.
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                       ,
j If you require further information, please do not hesitate to contact us.
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.
Very truly yours,
1 Very truly yours,                               l
%'w John DeVincentis Project Manager j
                                                                    %'w 1
DAM: tan i
John DeVincentis                               i Project Manager                                 j DAM: tan i
cc:
cc:   Director Division of Reactor Operations Inspection Office of Inspection and Enforcement Nuclear Regulatory Commission Washington, D.C.                 20555 801001-0077                         Q
Director Division of Reactor Operations Inspection Office of Inspection and Enforcement Nuclear Regulatory Commission Washington, D.C.
          .}}
20555 801001-0077 Q
.}}

Latest revision as of 06:37, 24 December 2024

Responds to IE Bulletin 80-19 & 80-19,Revision 1. Mercury-wetted Relays Are Used in Protection Sys Equipment. Relays Are Hermetically Sealed,Not Used in Matrix Logic Applications & Not Used in Scram Circuits
ML19347B154
Person / Time
Site: Seabrook  NextEra Energy icon.png
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)
v • d • e


Text

-

/ 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 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 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

.

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