ML20097J712
| ML20097J712 | |
| 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 | |
| SDR-153, NUDOCS 8409210357 | |
| Download: ML20097J712 (2) | |
Text
o 2840807830 PHILADEl.PHIA ELECTRIC COMPANY 2301 M ARKET STREET AUG 3 01984 P.O. BOX 8699 PHILADELPHIA. PA.19101 JOHN S. KEMPER V IC E-PR ESI D E N T ENG0 NEE ADNO AND WESS ARC 04 Mr. Thomas E. Murley, Director United States Nuclear Regulatory Commission office of Inspection and Enforcement, Region 1 631 Park Avenue King of Prussia, PA 19406
SUBJECT:
Significant Deficiency Report #153 Final Report on Defective General Electric Relay Connection Plugs Limerick Generating Station Units 1 and 2 NRC Construction Permits Nos. CPPR-106 & 107
REFERENCE:
Telecon of August 24, 1984 P. K. Pavlides (PECO) to Jane Grant (USNRC)
FILE:
QUAL 2-10-2 (SDR#153)
I
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 infomation was forwarded to the USNRC via the reference.
Sincerely, l
MHH:tws l
ts8278411008 l
Attachment l
r Copy to: Director of Inspection and Enforcement United States Nuclear Regulatory Commission l
Washington, DC 20555 l
l S. K. Chaudhary, Resident NRC Inspector (Limerick)
J. Wiggins, Resident NRC Inspector (Limerick) 8409210357 840830 PDR ADOCK 05000352 Ik S
PDR 16 O
a Limerick Gensrcting St tion Significant Deficiency Report #153 Defective General Electric Relay Connection Plugs Final Report 1.0 Iatroduction This report is intended as a final report concerning defec-tive General Electric relay connection plugs at the Limerick Generating Station (ISS).
The USNRC was notified of this reportable condition in a 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 t.he 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 1 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.
MHH:tws ts82784r950 i
,6 J