ENS Event | |
|---|---|
14:47 Aug 24, 2007 | |
| Title | Reactor Trip Breaker Undervoltage Trip Failure During Surveillance Testing |
| Event Description | During routine surveillance testing on Unit 1 'B' Train Solid State Protection System, per FNP-1-STP-33.2B, the 'B' Train Rx Trip Breaker Failed to trip when a trip signal was sent from one of the manual function test push buttons. Indicated voltage did go to zero, but the Reactor Trip Breaker did not open. Per the testing sequence, the shunt trip for this breaker was being blocked at this time. A timeout was taken to determine the best course of action. Following discussions with Shift Manager, Duty manager, Emergency Director, and Electrical Maintenance supervision, it was decided to determine if the breaker would trip via the shunt trip mechanism. The surveillance testing was continued, and the 'B' Reactor Trip Breaker opened when the test signal was again inserted with the shunt trip unblocked. The 'B' Reactor Trip Breaker was replaced with a new breaker, and was subsequently tested sat per applicable sections of the surveillance test procedure.
|
| Where | |
|---|---|
Farley  Alabama (NRC Region 2) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+0.63 h0.0263 days <br />0.00375 weeks <br />8.62974e-4 months <br />) | |
| Opened: | Scott Smith 15:25 Aug 24, 2007 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Aug 24, 2007 |
| 43593 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 532902018-03-26T18:38:00026 March 2018 18:38:00
[Table view]Other Unspec Reqmnt Technical Specifications Required Shutdown Due to Inoperable Main Steam Isolation Valve ENS 435932007-08-24T14:47:00024 August 2007 14:47:00 Other Unspec Reqmnt Reactor Trip Breaker Undervoltage Trip Failure During Surveillance Testing 2018-03-26T18:38:00 | |