ML19345F917
| ML19345F917 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 01/23/1981 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | William Jones OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 8102190537 | |
| Download: ML19345F917 (1) | |
Text
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CENTRAL FILES f
UNITED STATES NUCLEAR REGULATORY COMMISSION D
REGION IV A C' 8,'5.,,gg-.
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$11 RYAN Pt.AZA ORIVE SUITE 1000 NSIC ARuNGTON. TEXAS 76011 3
E January 23, 1981 Decket No.
50-235 6,4 9
a Omana Puolid Pcwer Distric i
6(L,b ATTN:
W. C. Jones, Division Manager -
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Preduction Coerations
-i p f N M $ "o $
1623 Harney Street Onana, Nebraska 68102 gu5 p
Gentlemen:
Ag Tne enciesed IE Circular No. 81-01 contains recomencations that may be acolicable to your facility with regard to design preolems associated with the sucject indicating pusncutton switches.
Shculd ycu nave any questions regarding :nis circular or the recemencations contained :nerein, clease contact
- nis office.
Sincerely, k
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Karl V. Seyfri Director Encicsures:
1.
IE Circular No. 31-01 2.
List of Recently issued IE Circulars 00:
- 5. C. Stevens, Manager
.cr: Calhcun Station Post Cffica Sox 98 cr: Calhoun, Necraska 63102 810 2190 9 )
l SSINS No.:
6830 Accession No.:
l 8008220280 l
IEC No. 81-01 UNITED STATES NUCLEAR REGULATORY COMMISSION l
0FFICE 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 l
Background:
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By letter dated September 18, 1980 (J. M. Curran to R. H. Engelken), Southern l
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 l
by SCE as having design deficiencies are used on the containment 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 i
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.
1 By letter dateu 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.
Discussion:
l The SCE report provided the following details of the problems previously mentioned:
"1.
The design of indicating pushbutton switches is such that during insertion of the laap assembly into the switch housing, shorting could occur between the metallic plunger and the energized indicator lamp connection inside the
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