ENS 39670

From kanterella

Jump to navigation Jump to search

v t e ENS Event
05:00 Mar 14, 2003
Title	10 Cfr Part 21 Report Regarding Failures of Abb Circuit Breakers
Event Description	Circuit breakers manufactured by ABB Inc. and used for Class 1E applications by Westinghouse were shipped to the Calvert Cliffs Plant with model 5 operating mechanisms installed. Recently, Westinghouse had retrofitted the breakers with model 7 operating mechanisms manufactured by ABB Inc. Westinghouse validated that the original breaker qualifications (for Class 1E applications) are still applicable with the model 7 operating mechanism installed. Two of these breakers failed to close and latch during testing at Calvert Cliffs. The first breaker failed to close and latch during acceptance testing on January 18, 2003. The second breaker failed to close and latch during its installation acceptance test in the breaker cubicle on January 27, 2001. * * UPDATE VIA FAX ON 12/24/03 AT 15:25 CST BY ABB INC * * * Summary: The issue reported in the notification above is limited in scope and there is no indication that the failure mode will exist in a K-Line breaker. ABB does concur that dimensional non-conformities were present in the breakers that exhibited the fail to close of the primary and secondary trip latches. ABB also concurs that this out-of-tolerance situation is contributory to the failure exhibited in the 5VHKR250 1200A breaker but is not in and of itself the root cause of failure. Notified R1DO (R. Lorson), R2DO (M. Ernstes), R3DO P. Louden), R4DO (L. Smith), NRR (Jack Foster) via email

ENS 39670 +/-
Where
Abb Inc Pittsburgh, Pennsylvania (NRC Region 1)
Organization:	Westinghouse
Reporting

10 CFR 21.21
Time - Person (Reporting Time:+10.78 h0.449 days <br />0.0642 weeks <br />0.0148 months <br />)
Opened:	Hank Sepp 15:47 Mar 14, 2003
NRC Officer:	Yamir Diaz
Last Updated:	Dec 25, 2003
39670 - NRC Website
v • d • e

v t e Emergency Notification System
Abb Inc with 10 CFR 21.21
WEEKMONTHYEAR2003-03-14T05:00:00 [Table view]
[ENS list for Abb Inc]

Retrieved from "https://kanterella.com/w/index.php?title=ENS_39670&oldid=428800"

ENS Notification