ENS 45477
ENS Event | |
|---|---|
05:00 Nov 6, 2009 | |
| Title | Part 21 Report - Potential Failure of Bonnet Valve |
| Event Description | The following is quoted selectively from the text of the original Part 21 notification received from Flowserve via fax:
On September 8, 2009, Flowserve Corporation was notified by Exelon-LaSalle Nuclear Power Station of a failure which occurred and was initially communicated via Flowserve Complaint Report #4914. The Referenced Complaint Report describes an anomaly with a Size 3/4 Figure 848Y bolted bonnet valve at the LaSalle Nuclear Power Station. The subject valve was in service at the time of disassembly. The disassembly revealed that the disk nut, which captures the valve stem in the valve main disk, had separated from the main disk. The valve in question is a manually operated, non-active valve. The safety function of this valve is to retain system pressure. This safety function was not affected by separation of the stem nut from the valve disk. However, other Figure 848 valves may have different safety related functions that could be affected by this type of failure. [Flowserve has determined that] the Nuclear Industry needs to be notified concerning the potential defect and encouraged to inspect the operation of their valves, especially if they have a safety-related function in the plant that may be adversely affected. The valves affected are Size 2 and smaller Edward Figure 848 valves manufactured by Rockwell International at the Sulphur Springs, Texas, and the Raleigh, North Carolina, manufacturing facilities prior to 1991. These valves may be tagged 'Rockwell', 'Rockwell Edward' or 'Edward'. The valves affected have the old design stem/disk assembly. Valves with Figure Number A848 incorporate the new design stem/disk connection and are not affected. The total number of valves affected and their installed locations are not known. The original report contains more technical details and information.
Upon further investigation, Flowserve has become aware that additional Figure Numbers, 849, 828, and 829 may also be affected by the deviation reported herein, as they share the OLD Stem/Disk Assembly Design. Notified R1DO (Ferdas), R2DO (Sykes), R3DO (Peterson), and R4DO (O'Keefe). |
| Where | |
|---|---|
| Flowserve Raleigh, North Carolina (NRC Region 1) | |
| Organization: | Flowserve |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+6.57 h0.274 days <br />0.0391 weeks <br />0.009 months <br />) | |
| Opened: | Robert Barry 11:34 Nov 6, 2009 |
| NRC Officer: | Eric Simpson |
| Last Updated: | Nov 24, 2009 |
| 45477 - NRC Website
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Flowserve with 10 CFR 21.21 | |
WEEKMONTHYEARENS 464032010-09-15T05:00:00015 September 2010 05:00:00
[Table view]10 CFR 21.21 Part 21 Report - Limitorque Limit Switch Defect ENS 454772009-11-06T05:00:0006 November 2009 05:00:00 10 CFR 21.21 Part 21 Report - Potential Failure of Bonnet Valve 2010-09-15T05:00:00 | |