ENS Event | |
|---|---|
19:36 May 26, 2015 | |
| Title | Part 21 Notification - Allen Bradley 700Rtc Relay Configuration |
| Event Description | This is a non-emergency notification, required by 10 CFR 21.21(d)(3)(i).
Brunswick has determined that Allen Bradley relays, base model 700RTC, contain an unevaluated Complex Programmable Logic Device (CPLD). This was an unpublished design change that was implemented to replace an obsolete integrated circuit chip. The undocumented design change did not result in a part number change from Allen Bradley. There was no change to the external appearance of the relay that would indicate that a design change had been made to the relay configuration. Therefore, qualification/dedication of the modified relays have not included additional testing for the new CPLD component. Testing, performed by Duke Energy, has demonstrated that this CPLD can be affected by electrical noise from operation of nearby relays which can reset the timing of the relay. This condition was discovered as a result of a post-maintenance test of an emergency diesel generator. Additional details associated with the discovery of this condition are contained in Brunswick Licensee Event Report 1-2015-002, dated May 20, 2015. Brunswick purchased, as commercial grade, 25 of the modified Allen Bradley 700RTC relays beginning in October, 2008. Duke Energy dedicated these relays for use in safety related applications at Brunswick. The dedicated relays were not provided to any third party customers. The NRC Senior Resident Inspector has been notified. Brunswick has taken applicable compensatory measures to insure no equipment is inoperable because of these relays. This problem was previously reported by AZZ/NLI Nuclear Logistics, Inc. in EN#51030. |
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+41.7 h1.738 days <br />0.248 weeks <br />0.0571 months <br />) | |
| Opened: | Mark Turkal 13:18 May 28, 2015 |
| NRC Officer: | John Shoemaker |
| Last Updated: | May 28, 2015 |
| 51095 - NRC Website
Loading map... | |
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 %) |
WEEKMONTHYEARENS 510952015-05-26T19:36:00026 May 2015 19:36:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Notification - Allen Bradley 700Rtc Relay Configuration 2015-05-26T19:36:00 | |