ENS Event | |
|---|---|
02:17 Nov 18, 2017 | |
| Title | Part 21 - Chapman Gate Valve Weak Link Analysis Defect |
| Event Description | The following information was excerpted from a facsimile received from Crane Nuclear:
This letter provides notification of a defect in a Weak Link Analysis provided to the Tennessee Valley Authority (TVA) by Crane-Aloyco, Inc. (CAI), a Crane Nuclear, Inc. (CNI) predecessor business unit, for a Chapman Gate Valve, Figure L900, Item # 18, Drawing CC05307, Revision B for the Browns Ferry Nuclear (BFN) plant. The subject valve was originally procured from Crane Chapman in 1968. In 1988, TVA requested Crane to supply a Weak Leak Analysis for the original valve. A Weak Link Analysis (OTC-258 Rev.0) was developed by CAI, which identified a maximum thrust capacity of approximately 112,000 lbf. In November 2017, Crane Nuclear, Inc. developed a new Weak Link Analysis for the valve. Crane Nuclear, Inc. provided the new Weak Link Analysis (WL-103 Rev. 0) to TVA on November 17th, 2017. Crane Nuclear. Inc. identified in the new Weak Link Analysis a maximum thrust capacity of approximately 96,000 lbf. CNI is reviewing our records to determine if the maximum thrust rating in any other Weak Link Analyses provided by CNI for gate valve designs with an SMB-4T or SMB-5T actuator exceeds the rating for the thrust bearings. Should you have any questions regarding this matter, please contact me, Joyce Hamman, Director, Safety & Quality at (678) 451-2280, Burt Anderson, Site Leader, at (630) 226-4990, or Samson Kay, Engineering Manager at (630) 226-4983. |
| Where | |
|---|---|
| Crane Nuclear Inc. Bolingbrook, Illinois (NRC Region 3) | |
| Organization: | Crane Nuclear Inc. |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+754.48 h31.437 days <br />4.491 weeks <br />1.033 months <br />) | |
| Opened: | Joyce Hamman 12:46 Dec 19, 2017 |
| NRC Officer: | Vince Klco |
| Last Updated: | Dec 19, 2017 |
| 53126 - NRC Website | |
Crane Nuclear Inc. with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 531262017-11-18T02:17:00018 November 2017 02:17:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Chapman Gate Valve Weak Link Analysis Defect 2017-11-18T02:17:00 | |