ML20097G025
| ML20097G025 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/30/1984 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| OL, SDR#153, NUDOCS 8409190232 | |
| Download: ML20097G025 (3) | |
Text
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. Mr. Thoras E. Murley, Director United States Nuclear Regulatory Coneission Office of Inspection and Enforcement, Region 1 631 Park Avenue King of Prussia, PA 19406 CCCXETEE Uh.it
SUBJECT:
Significant Deficiency Report #153 Final Report on Defective General Electric Relay Connection Plugs
'84 $CP 10 All :36 Limerick Generating Station Units 1 and *2 NRC Construction Permits Nos.,.CPPR-106 & 10f' a
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REFERENCE:
Telecon of August 24, 1984 P. K. Pavlides (PECO) to Jane Grant (USNRC)
FILE:
QUAL 2-10-2 (SDR#153)
Dear Mr. Murley:
The enclosure to this letter is provided as a final report concerning improperly sized General Electric relay connection plugs at the Limerick Generating Station (LGS).
Previous information was forwarded to the USNRC via the reference.
Sincerely,
[<W- (I MHHetws ts8278411008 Attachment Y
Copy to Director of Inspection and Enforcement United States Nuclear Regulatory Connission Washington, DC 2055F S. K. Chaudhary, Resident NRC Inspector (Limerick)
J. Wiggins, Resident NRC Inspector (Limerick) e 8409190232 840830 PDR ADOCK 05000352 S
)
cc Judge' lawrence Brenner (w/svlosure)
Judge Petcr A. Morric (w/enclosura)
' Judge Richard F. Cole (w/ enclosure)
Judge Christine M. Kohl (w/ enclosure)
Judge Gary J. Edles (w/ enclosure)
Judge Reginald L. Gotchy~
(w/ enclosure)
Troy B. Conner, Jr., Esq.
(w/ enclosure)
Ann P. Hodgdon, Esq.
(w/ enclosure)
Mr. Frank R. Romano (w/ enclosure)
Mr. Robert L. Anthony (w/ enclosure)
Ms. Maureen Mulligan (w/ enclosure)
Charles W. Elliott, Esq.
(w/ enclosure)
Zori G. Ferkin, Esq.
(w/ enclosure)
Mr. Thomas Gerusky (w/ enclosure)
Director, Penna. Emergency (w/ enclosure)
Management Agency Angus Iove, Esq.
(w/ enclosure)
David Wersan, Esq.
(w/ enclosure)
Robert J. Sugarman, Esq.
(w/ enclosure)
Martha W. Bush, Esq.
(w/ enclosure)
Spence W. Perry, Esq.
(w/ enclosure)
Jay M. Gutierrez, Esq.
(w/ enclosure)
Atomic Safety & Licensing Appeal Board (w/ enclosure)
Atomic Safety & Licensing Board Panel (w/ enclosure)
Docket & Service Section (w/ enclosure - 3 copies))
James Wiggins (w/ enclosure)
Timothy R. S. Campbell (w/ enclosure)
J
Limerick Gen:rsting Stction Significant DeficiOncy R; port #153 Defective General Electric Relay Connection Plugs Final Report 1.0 Introduction This report is intended as a final report concerning defec-tive General Electric relay connection plugs at the Limerick Generating Station (LGS).
The USNRC was notified of this reportable condition in a I
telecon, dated August 24, 1984.
2.0 Description of Problem Initially, " snug-fitting" relay connection plugs were a nuisance.
It was difficult to insert the connection plug into the relay. Once inserted, force was required to remove the plug.
However, during testing, protective relays had sporadically failed to trip the breakers.
This problem was linked only to relays containing " snug-fitting" connection plugs.
The matter was investigated.
The vendor explained that the snug-fitting plugs were improperly sized connection plugs fur-nished with the relays. When inserted, the problem plug wedges in the relay and may become cocked so as to open the trip circuit contacts.
3.0 Safety Implications The problem connection plugs were furnished with relays located in the 13kV and 2.3kV, as well as the safeguard 4kV switchgear at LGS.
A defective connection plug resulting in loss of the relay's trip circuit continuity could adversely affect the operation of safety-related equipment and the safeguard switchgear.
4.0 Corrective Action Properly sized relay connection plugs were obtained from General Electric.
These plugs were used as replacement plugs in the Unit I safeguard relays and those Unit 2 safeguard relays required for Unit 1 operation. A non-conformance report has been written to track the replacement of the plugs in the remaining Unit 2 safeguard relays.
MHHitws ts82784r950 i