ML19345F872
| ML19345F872 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 01/23/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Finfrock J JERSEY CENTRAL POWER & LIGHT CO. |
| References | |
| NUDOCS 8102190453 | |
| Download: ML19345F872 (1) | |
Text
-_
~
12
((p neag[o UNITED STATES g
- J' -'
g NUCLEAR REGULATORY COMMISSION y y ', "m C
REGION I 8
631 PARK AVENUE o-
%, ' V
,o#
KING OF PRUSSIA, PENNSYLVANIA 19406 Mjp,
Docket No. 50-219 jsg Jersey Central Power and Light Company
//7 y
ATTN:
Mr. Ivan R. Finfrock, Jr.
Y
~-
d Vice President
'I 0 ' CBF ';
n Madison Avenue at Punch Bowl Road 10H 775 gwo C. --
3 g,',ug[c Morristown, New Jersey 07960 e
%+
Gentlemen:
The enclosed IE Circular No. 81-01, " Design Problems Involving Indicating Pushbutton Switches Manufactured by Honeywell Incorporated," is forwarded to you for information.
No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, a
Boyc H. Grier Director
Enclosures:
1.
List of Recently Issued Circulars CONTACT:
E. G. Greenman (215-337-5267) cc w/encls:
J. T. Carroll, Station Manager Q
31021901)63
l SSINS No.:
6830 Accession No.:
8008220280 IEC No. 81-01 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C. 20555 January 23, 1981 IE CIRCULAR NO. 8!-01:
DESIGN PROBLENS. INVOLVING INDICATING PUSHBUTTON SWITCHES MANUFACTURED BY HONEYWELL INCORPORATED
Background:
By letter dated September 18, 1980 (J. M. Curran to R. H. Engelken), Southern California Edison Company (SCE) notified NRC of design problems involving certain indicating pushbutton switches.
The subject switches are of the type designated as Series 2 indicating pushbutton switches that are manufactured by the Micro Witch Division of Honeywell Incorporated.
The switches identified l
by SCE as having design deficiencies are used on the containment isolation panels at San Onofre Unit 1 (Decket No. 50-206).
SCE identified two problems with the subject switches, both of which manifest themselves during relamping:
(1) a short circuit may be induced; and (2) the circuit controlled by the switch may inadvertently be actuated.
Although the specificity of this circular is restricted to the previously mentioned Series 2 switches the deficiencies cited may be common to other indicating pushbutton switches.
Accordingly, holders of operating licenses and construction permits should scrutinize the design of other indicating pushbutton switches in their facilities for susceptiblity to the above problems.
By letter dated October 10,1980 (J. G. Haynes to R. H. Engelken), SCE submitted a detailed followup report addressing the defective switches.
Sections of the SCE report containing relevant information have been excerpted and included in the paragraphs that follow.
Sections so excerpted are identified by quotation marks.
l Discussion:
The SCE report provided the following details of the problems previously mentioned:
j "1.
The design of indicating pushbutton switches is such that during insertion of the lamp assembly into the switch housing, shorting could occur between the metallic plunger and the energized indicator l
lamp connection inside the
'~
~'
is connected to the cabinet
~ ^ _ ^
~'
control circuit could be sh control circuit if it is en DUPLICATE DOCUMENT
}
Entire document previously entered into system under:
94of? 7 4 240
^=
No. of pages: _h
~wama n =
_