ENS 52670
ENS Event | |
|---|---|
07:00 Apr 5, 2017 | |
| Title | Part 21 - Circuit Breaker Defect Discovered During Current Injection Testing |
| Event Description | On April 5, 2017, Arizona Public Service Company (APS) completed an evaluation of a deviation, and concluded the condition represented a defect under 10 CFR 21. APS previously submitted an interim report (ADAMS Accession Number ML 16344A118) for this condition pursuant to 10 CFR 21.21(a)(2).
A GE-Hitachi Type AKR-2BE-50, 2000 Amp circuit breaker (used to connect Class 1E batteries to the related Class 1E 125 VDC busses) exhibited arcing and smoking during current injection testing performed to test the overcurrent trip setpoint prior to installation. Arcing occurred at one of two hex bolts anchoring the protective trip device to the line side bus. The electrical arcing resulted from inadequate tightening of both hex bolts which caused a loose electrical connection on the bus within the breaker. APS concluded this condition could result in the breaker failing to perform its safety function and thus could create a substantial safety hazard. The breaker had been refurbished by GE-Hitachi and was received by APS and tested on October 13, 2016. Following the test failure, the damaged bolt was replaced, both bolts were tightened, and the breaker was retested and installed. Pre-installation inspection and testing that includes current injection testing, recommended in GEH document GEK-64459, should, and did, detect faults such as the condition identified in this notification. GE-Hitachi entered this failure into their corrective action program. Vendor: GE HITACHI NUCLEAR ENERGY, 3901 CASTLE HAYNE RD., WILMINGTON, NC 28402-2819 Device: Breaker Model AKR-2BE-50, 2000 Amp, Serial No. N8682600001 The NRC Resident Inspector has been informed. |
| Where | |
|---|---|
Palo Verde  Arizona (NRC Region 4) | |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+55.82 h2.326 days <br />0.332 weeks <br />0.0765 months <br />) | |
| Opened: | David Heckman 14:49 Apr 7, 2017 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Apr 7, 2017 |
| 52670 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 546212020-03-19T07:00:00019 March 2020 07:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Notification - Transducer Defect ENS 543092019-03-03T07:00:0003 March 2019 07:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Ge Hitachi Primary Contact Finger Surface Defect ENS 526702017-04-05T07:00:0005 April 2017 07:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Circuit Breaker Defect Discovered During Current Injection Testing 2020-03-19T07:00:00 | |