ULNRC-04921, 10CFR21 Notification for GE Nuclear AKE-30 Low Voltage Circuit Breaker Upper Stud Assemblies, Part Number Q139C4632G1
| ML033320399 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 11/20/2003 |
| From: | Affolter R AmerenUE |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| ULNRC-04921 | |
| Download: ML033320399 (3) | |
Text
AmerenUE Cal/away Plant PO Box 620 Fulton, MO 65251 573.676.8240 573.676.4056 fax Ronald D. Affolter Vice President -Nuclear November 20, 2003 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 ULNRC-04921 Amteren UE Ladies and Gentlemen:
DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.
FACILITY OPERATING LICENSE NPF-30 10 CFR 21 notification for GE Nuclear AKR-30 low voltage circuit breaker upper stud assemblies, part number 0139C4632G1 This notice is being sent within the two day period to inform you of a deviation related to upper stud assemblies for General Electric Nuclear AKR-30 low voltage circuit breakers.
The concern is specific to upper stud assemblies supplied under part number Q 139C4632G1. The deviation consists of an incorrect angle between the stud and pivot. Of the fifteen assemblies supplied with possible deviations, to AmerenUE, five were returned and ten had been installed in Callaway Plant. The deviation will not prevent the circuit breakers from performing their design basis function at the Callaway Plant, however the capability of the assemblies is indeterminate for severe faulted conditions. A circuit breaker could fail if an upper stud assembly with the identified deviation was installed and the circuit breaker was called upon to interrupt a severe fault.
If you have any questions, please contact David M. Epperson at 573/676-4664 or via e-mail at dmeppersonkJcal.ameren.com.
Very truly yours, Ronal
.Af Vice President, Nuclear RDA/JER/slk Enclosure a subsidiary of Ameren Corporation
ULNRC-04921 November 20, 2003 Page 2 cc: Mr. Bruce S. Mallet Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Jack N. Donohew (2 copies)
Licensing Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 7E1 Washington, DC 20555-2738 Manager, Electric Department Missouri Public Service Commission PO Box 360 Jefferson City, MO 65102 Records Center Institute of Nuclear Power Operations 700 Galleria Parkway Atlanta, GA 30339
Enclosure:
ULNRC04921 Page 1 of 1 Name and address of individuals informing the NRC:
Basic component which contains a defect:
Firm supplying basic component which contains a defect:
Nature of defect:
Date on which information of the defect was obtained:
Location of basic components containing defect:
Corrective action which has been taken:
Advice related to the defect:
David M. Epperson (573) 676-4664 AmerenUE P.O. Box 620 Fulton, MO 65251 G.E. Nuclear AKR-30 Low Voltage Circuit Breaker Upper Stud Assemblies, part number Q139C4632G1 General Electric Nuclear Energy The angle between the stud and pivot were less than indicated on the design drawing. This deviation results in an overlap between the moveable main and stationary arcing contacts which GE states is an untested and uncertified configuration. The assemblies will perform their design basis function however, the condition, function, operability, and capability of the assembly is indeterminate for severe faulted conditions.
09-24-2003 AmerenUE purchased 15 potentially defective assemblies. Five have been returned to GE. The remaining 10 assemblies have been installed in AKR-30 load center circuit breakers. GE states that AmerenUE/Callaway Plant is the only plant to receive defective upper stud assemblies. Callaway is not in the position to determine if similar assemblies with this defect have been supplied commercially, through third party dedication entities, or through GE overhaul facilities.
Five defective assemblies were returned to GE. The locations of 10 potentially defective assemblies have been determined. Work documents have been initiated to inspect and rework, as necessary, all breakers that could have defective assemblies.
Based on the information provided, Callaway has concluded that this deviation does not constitute a "defect" as defined in IOCFR Part 21 because the breakers would still perform their design basis requirements and would not create a substantial safety hazard. However, Callaway can not determine if the potential for a significant safety hazard or exceeding of a technical specification safety limit could exist at another nuclear power plant.