ENS 44463
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ENS Event | |
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04:43 Sep 4, 2008 | |
Title | Failure of Dampers to Auto Close |
Event Description | Due to RPS A Circuit Protector surveillance testing, a transfer of 'A' Reactor Protection System from alternate power supply back to the 1A RPS MG-set was required. An expected group 6 containment isolation signal was received during the power transfer. Upon review of plant status to ensure systems responded as expected, it was determined that reactor ventilation zone exhaust dampers 1-DMP-64-42 and 1-DMP-64-43 (Inboard and Outboard Reactor Zone Exhaust Dampers) failed to auto-close. Isolation of these dampers is a required safety function.
The dampers were administratively closed and deactivated in accordance with plant technical specification 3.6.4.2 action B. At the time of this report the cause for failure to auto close has not been determined. The licensee notified the NRC Resident Inspector. |
Where | |
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Browns Ferry Alabama (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
Time - Person (Reporting Time:+0.35 h0.0146 days <br />0.00208 weeks <br />4.7943e-4 months <br />) | |
Opened: | Ricky Givins 05:04 Sep 4, 2008 |
NRC Officer: | Pete Snyder |
Last Updated: | Sep 4, 2008 |
44463 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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