ENS 50691
ENS Event | |
|---|---|
05:00 Dec 17, 2014 | |
| Title | Part 21 Report - Potential Defect Regarding Kf Relays |
| Event Description | Recent seismic testing results of the above Class 1E KF under-frequency relays uncovered inaccurate qualification by similarity to the tested relay 1328D72A03 (qualified in 2011). The subject relays do not meet the previously published ZPA rating, but meet a rating of 1.7g in accordance with IEEE C37.98-1987 requirements.
Records show a total of 37 suspect relays were provided to seven customers. ABB does not have the capability to perform the evaluation to determine if a defect exists, thus we are notifying the purchasers or affected licensees of this determination so that they may evaluate the deviation, pursuant to 10 CFR. 21.21(b). If you have any questions regarding this notice, please contact the ABB Technical Support 954-752-6700. Dennis Batovsky Managing Director
This letter is an update to the Part 21 Notification submitted on December 17, 2014, 'Potential defect regarding KF relay zero period acceleration (ZPA) rating'. ABB reminds all licensees, that per ABB KF Under-frequency relays, Instruction Leaflet 41-503.21A effective April 1997, 'the normally closed contact at terminal number 2 should not be used for critical circuits due to a low fragility rating'. ABB [has] conducted the following actions: -ABB has performed an initial extent of condition evaluation to determine if this situation exists in other electromechanical IE qualified relays. There are no additional findings at this time. -ABB issued a corrective action to improve existing engineering qualification procedures that govern qualification by similarity. If you have any questions regarding this notice, please contact the ABB Technical Support 954-752-6700. Notified R1DO (Burritt), R2DO (Sykes), R3DO (Cameron), R4DO (Kellar) and Part 21 Group (via email).
The following is a synopsis of the updated information received: The seismic testing results for 1328D72A01 and 1328D72A02 Class 1E KF Under-frequency relays met a ZPA rating of 1.72g. This was previously communicated as 1.7g. In lieu of previously communicated actions, future orders for 1328D72A01 and 1328D72A02 Class 1E KF Under-frequency relays will be only available at the published ZPA rating of 1.72g. Customers requiring higher ZPA will need to procure Class 1E KF style 1328D72A03 or 1328D72A04, as appropriate. Notified R1DO (Bickett), R2DO (Lopez), R3DO (Peterson), R4DO (Azua) and Part 21 Group (via email). |
| Where | |
|---|---|
| Abb Group Coral Springs, Florida (NRC Region 1) | |
| Organization: | Abb Group |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+12.63 h0.526 days <br />0.0752 weeks <br />0.0173 months <br />) | |
| Opened: | Dennis Batovsky 17:38 Dec 17, 2014 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Nov 17, 2016 |
| 50691 - NRC Website | |
Abb Group with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 506912014-12-17T05:00:00017 December 2014 05:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Potential Defect Regarding Kf Relays 2014-12-17T05:00:00 | |