ENS 51285
ENS Event | |
|---|---|
04:00 Jun 5, 2015 | |
| Title | Part 21 Report - Ferraz Shawmut/Mersen Fuses P/N: Ajt25 and Ajt60 |
| Event Description | The following information was excerpted from the email provided by the reporting organization:
On April 2015, United Controls International (UCI) performed dedication testing on time delay fuses AJT25 and AJT60 for First Energy - Perry Nuclear Power Plant under purchase orders 45469886 and 45469450, respectively. The subject fuses were being tested per United Controls Standard dedication testing which excludes seismic and environmental testing requirements. Both fuses, AJT25 and AJT60 opened during their current clearing tests at times that are within their respective clearing time tolerance ranges but their Smartspot labels did not change color, as required, to indicate the fuses cleared. For fuse AJT25, eight fuses have been tested, including one (1) fuse from the first lot which comprises 30 fuses (with manufacture date 09/15 [9th week of 2015]) and seven (7) fuses from the second lot which comprises 32 fuses (with manufacture date 10/15). Five (5) fuses were tested for current clearing at 135% of the fuse rated current, two (2) fuses were tested for current clearing at 200% of the fuse rated current and one (1) fuse was tested for current clearing at 500% of the fuse rated current. For fuse AJT60 with manufacture date 06/15, only one (1) fuse was tested from the received lot of fuses which comprises 24 fuses for current clearing time at 135% of the fuse rated current. Further testing of the AJT60 fuses was not performed since a trend was already observed in regard to the fuses AJT25 failure. UCI has returned all received fuses in the three (3) received lots. Mersen [Ferraz/Shawmut/Mersen] has then performed evaluation on the 30 AJT25 fuses with manufacture date of 9/15 (9th week of 2015), confirmed that the seven (7) fuses that UCI has tested were open and conducted testing on six (6) among the remaining 23 fuses. Testing by Mersen revealed that only two out of the six fuses had their Smartspot indicator that went off to indicate that the fuses cleared. Upon further examination by Mersen; it is believed that over tightening of the crimping jars during installation and crimping of the ferrule endcaps is the cause of the Smartspot indicator's malfunction. The fuses are Ferraz Shawmut/Mersen part numbers AJT25 and AJT60. UCI recommends the purchaser to include a requirement for suppliers to provide fuse with manufacture date after 6/30/15 where the manufacturer has performed corrective action to prevent this issue from recurring. Point of Contact: Divya Paidy, Engineering Manager, dpaidy@unitedcontrols.com, (770) 496-1406, ext. 106, |
| Where | |
|---|---|
| Ferraz Shawmut/Mersen Norcross, Georgia (NRC Region 1) | |
| Organization: | United Controls International |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+1446.48 h60.27 days <br />8.61 weeks <br />1.981 months <br />) | |
| Opened: | Korina Looft 10:29 Aug 4, 2015 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Aug 4, 2015 |
| 51285 - NRC Website | |
Ferraz Shawmut/Mersen with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 512852015-06-05T04:00:0005 June 2015 04:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Ferraz Shawmut/Mersen Fuses P/N: Ajt25 and Ajt60 2015-06-05T04:00:00 | |