ENS Event | |
|---|---|
05:00 Aug 28, 2008 | |
| Title | Replacement Diaphragm Failures Due Inadequate Cure and Operation Over Maximum Pressure |
| Event Description | Fisher was recently notified by Luminant, Comanche Peak SES of two replacement diaphragm failures. These diaphragms had been in service for approximately 3.1 years.
The diaphragms lost frictional flange retention in a progressive type failure which transferred retention stress to the bolt/diaphragm interfaces and caused localized stresses great enough to initiate rupture. Rupture propagation occurred catastrophically in multiple directions and rapid loss of actuator pressure resulted and consequently, opening of the valve. This is applicable to all Fisher size 80, type 657 and 657NS sliding stem valve actuators sold to the nuclear industry by Fisher Controls International LLC that are equipped with nitrile/nylon diaphragms (Fisher part number 1R6375X0072). It is unknown what plants in addition to Comanche Peak are affected by this report. |
| Where | |
|---|---|
| Fisher Controls International, Llc Marshalltown, Iowa (NRC Region 3) | |
| Organization: | Emerson Process Management |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+8.8 h0.367 days <br />0.0524 weeks <br />0.0121 months <br />) | |
| Opened: | Matthew Farrell 13:48 Aug 28, 2008 |
| NRC Officer: | Jason Kozal |
| Last Updated: | Aug 28, 2008 |
| 44445 - NRC Website | |
Fisher Controls International, Llc with 10 CFR 21.21 | |
WEEKMONTHYEARENS 446702008-10-28T06:00:00028 October 2008 06:00:00
[Table view]10 CFR 21.21 Part 21 - 18" Valve Assembly Bearings Not Dedicated Parts ENS 444452008-08-28T05:00:00028 August 2008 05:00:00 10 CFR 21.21 Replacement Diaphragm Failures Due Inadequate Cure and Operation Over Maximum Pressure ENS 443222008-06-27T05:00:00027 June 2008 05:00:00 10 CFR 21.21 Part 21 Notification - Performance Affected on 3" Cl150 Fisher V150 Valve Assemblies ENS 434722007-06-27T05:00:00027 June 2007 05:00:00 10 CFR 21.21 Part 21 Notification - Fisher Type 67C Series Regulator Screw Fracture 2008-08-28T05:00:00 | |