ENS Event | |
|---|---|
04:00 Jun 17, 2019 | |
| Title | Part 21 Report - Na - Type Actuator Outer Clutch Ring Anomaly |
| Event Description | The following was received via fax:
Rotork Controls Inc. has identified a potential concern as defined under 10 CFR Part 21 with model NA1 [nuclear A-range (inside containment)] and NA5 [seismic component] nuclear safety related actuators manufactured [and shipped] between January 1, 1979 and December 31, 1982. Switch mechanism in these actuators utilize an Outer Clutch Ring ([Part number =] N40039) made from beryllium copper. [Duke Energy] has reported (4) instances of Outer Clutch Ring failure between 2000 and 2019 [at Catawba and McGuire]. All failures occurred in Outer Clutch Rings made from beryllium copper. The number of affected actuators remaining installed is thought to be low and those still installed are approaching the end of their 40 year service life. Rotork cannot assess the risk further. Rotork recommends licensed operators assess this potential failure mode if actuators from this date range are still installed and should consider risk if affected actuators are to remain in service beyond 40 years. Failure of the Outer Clutch Ring results in: 1) lost travel limit switch operation in open and closed directions; 2) lost auxiliary switch operation for open and closed indication limits; 3) lost mechanical torque latch operation, if fitted. Torque limit sensing is not affected. AOP [Add-On-Pack] operation is not affected. In 1982, Rotork changed the Outer Clutch Ring material to spring steel 'to improve setting and operation.' Rotork Controls, Inc. 675 Mile Crossing Blvd. Rochester, New York 14624 tel: 1-585-247-2304 fax: 1-585-247-2308 www.rotork.com info@rotork.com |
| Where | |
|---|---|
| Rotork Controls Rochester, New York (NRC Region 1) | |
| Organization: | Rotork Controls |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+2360.58 h98.358 days <br />14.051 weeks <br />3.234 months <br />) | |
| Opened: | Patrick A Shaw 12:35 Sep 23, 2019 |
| NRC Officer: | Ossy Font |
| Last Updated: | Sep 23, 2019 |
| 54288 - NRC Website | |
Rotork Controls with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 542882019-06-17T04:00:00017 June 2019 04:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Na - Type Actuator Outer Clutch Ring Anomaly 2019-06-17T04:00:00 | |