05000305/FIN-2012002-03
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Finding | |
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| Title | Potential Inadequate Commercial Grade Dedication |
| Description | On January 21, the licensee discovered elevated noise on TBFCU motor 1B. Subsequent vibration data indicated that the outboard bearing was in imminent failure. The licensee declared the FCU inoperable, replaced the motor, and returned the FCU to a functional status at 7:41 a.m. on January 22. A failure analysis of the motor and bearing determined that the apparent cause of the motor failure was incorrect assembly of the motor after installation of sealed bearings at a local vendor. The licensee also considered an undetected original manufacturing defect of the motor that resulted in excessive thrust load on the bearing was also a potential apparent cause because it could not be ruled out. The motor was procured as NSR; the original bearings were replaced at a local vendor for double shielded bearings; and then the motor was commercially dedicated. Since the opposite train motor was procured at the same time using the same process, the licensee replaced that the motor and also sent it off for analysis. The inspectors were concerned that the incorrect assembly error was not discovered during the commercial dedication process and inspected the commercial dedication package for the motor. The inspectors found that the critical characteristics for the dedication process may have been inadequate to identify the incorrect assembly at the vendor; however, the licensee informed the inspectors near the end of the inspection period that the failure analysis for the second motor may have had different conclusions than the first. The inspectors were unable to evaluate the second failure analysis prior to the end of the inspection period, and needed additional time to determine if a performance deficiency existed. As a result, this item was considered to be unresolved pending a review of the second failure analysis. |
| Site: | Kewaunee  |
|---|---|
| Report | IR 05000305/2012002 Section 1R18 |
| Date counted | Mar 31, 2012 (2012Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.18 |
| Inspectors (proximate) | R Winter K Riemer J Jandovitz R Krsek V Meghani K Barclay A Shaikh V Myersd Mcneilk Riemer R Krsek K Barclay A Shaikh |
| INPO aspect | |
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Finding - Kewaunee - IR 05000305/2012002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Kewaunee) @ 2012Q1
Self-Identified List (Kewaunee)
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