ML19345F907
| ML19345F907 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 01/23/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Tallman W PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| References | |
| NUDOCS 8102190509 | |
| Download: ML19345F907 (1) | |
Text
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NUCLEAR REGULATORY COMMISSION E
REGION 1
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631 PARK AVENUE V
KING OF PRUSSIA, PENNSYLVANIA 19406
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JAN 2 31981 Docket Nos. 50-443 50-444 Public Service Company of New Hampshire D
o ATTN: Mr. W. C. Tallman I
}Q 41 Chairman and Chief Executive Officer IL I
1000 Elm Street g
NLUM Manchester, New Hampshire 03105 cED 0 219M * -
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h' Gentlemen:
3 WITl_r The enclosed IE Circular No. 81-01, " Design Problems Involving drcating 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, Boyc H. Grier Director
Enclosures:
1.
List of Recently Issued Circulars CONTACT:
E. G. Greenman (215-337-5267) l 1
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cc w/ enc 1s:
l John DeVincentis, Project Manager l
1 8102190 %
SSINS No.:
6830 Accession No.:
8008220280 IEC No. 81-01 i
UNITED STATES NUCLEAR REGULATORY COMMISSION l
OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C. 20555 January 23, 1981 j
IE CIRCULAR h0. 8!-01:
DESIGN PROBLEMS. INVOLVING INDICATING PUSHBUTTON SWITCHES MANUFACTURED BY HONEYWELL INCORPORATED
Background:
By letter dated September 18,1980 (J. M. Curran to R. H. Erigelken), 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 Switch Division of Honeywell Incorporated.
The switches identified by SCE as having design deficiencies are used on the contairment isolation panels at San Onofre Unit 1 (Docket 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 circu' ? 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 addressin-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.
Discussion:
The SCF report provided the following details of the problems previously mentioned:
"1.
The design of indicating pushbutton swif.ches is such that during l
insertion of the lamp assembly into the switch nousing, shorting could occur between the metallic plunger and the energized indicator lamp connection inside the
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