ML19305B176
| ML19305B176 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 03/07/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Leonard J POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK |
| References | |
| NUDOCS 8003190271 | |
| Download: ML19305B176 (1) | |
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UNITED STATES E
NUCLEAR REGULATORY COMMISSION g
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REGION I 4,*****,&[
631 PARK AVENUE 4
KING OF PRUSSIA, PENNSYLVANIA 19406 March 7, 1980 Docket No. 50-333 Power Authority of the State of New York James A. FitzPatrick Nuclear Power Plant ATTN:
Mr. J. D. Leonard, Jr.
Resident Manager P. O. Box 41 Lycoming, New York 13093 Gentlemen:
The enclosed IE Information Notice No. 80-08, The States Company Sliding Link Electrical Terminal Block, 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
Mff Boyce H. Grier Director
Enclosures:
1.
IE Information Notice No. 80-08 with Attachment 2.
List of Recently Issued IE Information Notices CONTACT:
S. D. Ebneter (215-337-5296) cc w/encls:
George T. Berry, Executive Director P. W. Lyon, Manager - Nuclear Operations A. Klausmann, Director, Quality Assurance M. C. Cosgrove, Quality Assurance Supervisor J. F. Davis, Chairman, Safety Review Committee C. M. Pratt, Assistant General Counsel G. M. Wil/erding, Licensing Supervisor 0003190273 s
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ENCLOSURE 1 SSINS: 6870 UNITED STATES Accession No.:
NUCLEAR REGULATORY COMMISSION 7912190689 0FFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Information Notice No. 80-08 Date:
March 7, 1980 Page 1 of 1
- THE STATES COMPANY SLIDING LINK ELECTRICAL TERMINAL BLOCK Description of Circumstances:
On July 19, 1979, the Consumers Power Company notified the Nuclear Regulatory Commission of a defect found in the sliding link electrical terminal block manufactured by the States Company, a subsidiary of Multi Amp Corp.
The defective terminal blocks were found at the Midland plant.
The connection between the two slotted bars on the terminal block is made by a U-shaped sliding link and spacer located between the two bars.
The top of the U-shaped link and the spacer are drilled and the bottom of the link is threaded to accept a 8-32 screw. When the screw is tightened it binds the link, spacer and bar together to make electrical connection.
Loosening the screw and sliding the link from between the bars breaks the connection.
The purpose of the link is to provide easy insertion of test instruments, etc. into the circuit.'
The defect, which has been identified in 5% of the terminal blocks checked, occurs in the form of a crack between the threaded screwhole and the side of the U-shaped link. When the screw is tightened the crack widens and a poor er intermittent electrical connection can result.
A defective link is impossible to cinch tightly in place and is difficult to detect visually. shows the States Company terminal block.
The defect. a crack in the bottom portion of the metal U-shaped link, is displayed in the exploded view of the terminal block assembly.
These terminal blocks are widely used in the nuclear industry and may be used as permanent installations in safety related systems.
The defective mechanical connection can cause an electrical circuit malfunction.
This Information Notice is provided to inform licensees of a potentially significan' matter.
It is expected that recipients will review the informa-tion for applicability to their facilities.
No written response to this IE leformation Notice is required.
However, the reporting requirements as set forth in the regulations must be met.
If you require additional information regcrding this matter, contact the Director of the appropriate NRC Regional Offise.
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Attachment:
Graphic Display of Terminal odJ
=MJh Block
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ENCLOSURE 2 IE Information Notice No. 80-08 Date:
March 7, 1980 Page 1 of 1 RECENTLY ISSUED IE INFORMATION NOTICES Information Subject Date Issued to j
Notice No.
Issued 79-32 Separation of Electrical 12/21/79 All Power Reactor Faci-Cables for HPCI and ADS lities with an Operating License (0L) or Construction Permit (CP) 79-33 Improper Closure of Primary 12/21/79 All Power Reactor Faci-Containment Access Hatches lities with an OL or CP 79-34 Inadequate Design of Safety-12/31/79 All Power Reactor Faci-Related Heat Exchangers lities with an OL or CP 79-35 Control of Maintenance 12/31/79 All Power Reactor Faci-and Essential Equipment lities with an OL or CP 79-36 Computt - Code Defect in 12/31/79 All Power Reactor Faci-Stress Analysis of Piping lities with an OL or CP Elbow 79-37 Cracking in Low Presssure 12/31/79 All Power Reactor Faci-Turbine Discs lities with an OL or CP 80-01 Fuel Handling Events 1/4/80 All Power Reactor Faci-lities with an OL or CP 80-02 8X8R Water Rod Lower 1/25/80 All BWR Facilities with End Plug Wear an OL or CP 80-03 Main Turbine Electro-1/31/80 All Power Reactor Faci-hydraulic Control System lities with an OL or CP-80-04 BWR Fuel Exposure in Excess 2/4/80 All BWR Facilities with of Limits an OL or CP 80-05 Chloride Contamination of 2/8/80 All Power Reactor Faci-Safety Related Piping and lities with an OL or CP Components and applicants for a CP 80-06 Notification of Signif-2/27/80 All Power Reactor Faci-icant Events lities with an OL and applicant for OL 80-07 Pump Fatigue Cracking 2/29/80 All Power Reactor Faci-lities with an OL or CP
Attacnment to IE Information Notice No. 80-08 ENCLOSURE 1 TO IE INFORMATION NOTICE 80-I I
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