ML19343C333
| ML19343C333 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/08/1977 |
| From: | Switzer D NORTHEAST NUCLEAR ENERGY CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-77-05, IEB-77-05A, IEB-77-5, NUDOCS 8103090520 | |
| Download: ML19343C333 (2) | |
Text
0 b
- L
=
NNEGO
. = Eem
- A:TFO:0 C0v.ECT cui :Em NORTHEAST NUCLEAR ENERGY COMPANY m66an A NC8tmEAST UTILmES COMPANY December 8, 1977 Docket No. 50-245 50-336 Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I U. S. Nuclear Regulatory Cocraission
'631 Park Avenue King of Prussia, PA 19406
References:
(1)
- 8. H. Grier letter to D. C. Switzer dated November 8,1977 (2)
B. H. Grier letter to D. C. Switzer dated November 15, 1977 Gentlemen:.
Millstone Nuclear Power Station, Units No.1 and 2 Electrical Connector Assemblies As requested in IE Bulletins 77-05 and 77-05A, we have investigated the existence in Millstone Units 1 and 2 of electrical connectors that are subject to accident conditions and are contained in a system whose function it is to mitigate the consequences of that accident.
In Millstone Unit No. l-there are no electrical conncetors of any type that are subject Lto accident conditions and that are contained in systems whose function it is to mitigate the consequences of that accident.
In this regard there:is no further action required by the above IE Bulletins on Millstone Unit No.1.
In Millstone Unit No. 2 we have determined that there are no electrical connectors manufactured by Bendix, ITT Cannon or Gulton in safety systems.
and exposed to an accident environment. There are however, approxirately 16 coaxial connectors associated with 8 pcwer range nuclear detectors that are loca_ted in the containment and may possibly be required to function in order to mitigate an accident. - Documented evidence that these connectors will successfully function under accident conditions is not presently available.
However, our review of _ the postulated accidents for which these connectors are required to function, indicates that they will perform this function before there is a possibility of_ their failure due to the environ-
- mental consequences of such accidents.
In the unif kely event.of a connecter failure from such accident environment, the accident would be detected by other non-connector dependent sensors which will ' initiate appropriate accident mitigating equipments.
a
/Ol fl036$0SWd e
S
~;.
. Coaxial connectors are utilized in this application since they are the only device available to satisfactorily join circuit components required to be' interconnected by coaxial cable.
There are no other electrical connectors either inside or outside the containment that are subject to accident conditions and that are contained in systems whose function it is to mitigate the consequences of that accident.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY D. C. Switzer President cc:
U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Construction Inspection Washington, D. C.
20555 A
i Y-
~~
.