ULNRC-04912, 10 CFR 21 Notification for GE Magne-Blast Breaker Tube and Piston Assemblies
| ML033090478 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 10/28/2003 |
| From: | Affolter R Union Electric Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| ULNRC-04912 | |
| Download: ML033090478 (3) | |
Text
I
%F' AmerenUE Callaway Plant PO Box 620 Fulton, MIO 65251 573.676.8240 573 676.4056 fax Ronald D. Affolter Vice President -Nuclear October 28, 2003 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop PI-] 37 Washington, DC 20555-0001 ULNRC-04912 WAmerenUE Ladies and Gentlemen:
DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT I UNION ELECTRIC CO.
FACILITY OPERATING LICENSE NPF-30 10 CFR 21 notification for GE Maerne-Blast breaker tube and piston assemblies This notice is being sent within the two day period to inform you of a safety concern related to tube and piston assemblies for GE Magne-Blast breakers (model AM-4.16-350-2h medium voltage circuit breaker).
The concern is specific to tube and piston assemblies supplied under part number Q0213X0343R094. All five assemblies supplied to AmerenUE contain a dimensional design error which would cause the assembly to interfere and bind with the circuit breaker movable contact assembly, which would render the breaker inoperative.
If you have any questions, please contact David M. Epperson at 573/676-4664 or via e-mail at dmepperson(~cal.ameren.com.
Vex truly yours, RonaA Affolter Vice President, Nuclear RDA/JER/slk Enclosure 1J )
a subsidiary of Ameren Corporation
ULNRC04912 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
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:
David M. Epperson (573) 676-4664 AmerenUE Callaway Plant P.O. Box 620 Fulton, MO 65251 G. E. Nuclear Magne-Blast breaker model AM-4.16-350-2H medium voltage circuit breaker tube and piston assembly, part number Q0213X0343R094 General Electric Nuclear Energy Dimensional Design error which would cause the assembly to interfere and bind with the circuit breaker movable contact assembly, which would render the breaker inoperative. A manufacturing defect was also present in one of the five assemblies supplied to Callaway. An incomplete crimp on one of the assemblies could have rendered the breaker inoperable.
If the defective assemblies were installed, this could have created the potential for multiple common-cause circuit breaker failures.
09-04-2003 Location of basic components containing defect:
Corrective Action which has been taken:
Advice related to the defect:
All five assemblies supplied to Callaway under Ameren P.O. 096441 were returned to GE Nuclear for evaluation. GENE states that the only utility to have ordered the assembly after the design change (which caused the defect) was the Callaway Plant/AmerenUE.
However, 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.
All basic components with the defect at Callaway were returned to GENE under RMA #U0301 1.
It is not believed that any installed breakers at other nuclear power plants are affected by this issue because standard maintenance procedures based on GE breaker instructions GEK-7320 would have detected that the primary contact gap would not meet acceptance criteria.
Additionally, breaker cycling after maintenance would have resulted in binding of the breaker during these pre installation test.