05000289/FIN-2009005-01
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Finding | |
|---|---|
| Title | Potential CO2 Migration Outside the Relay Room Fire Area |
| Description | The inspectors identified a Green, non-cited violation of the Three Mile Island operating license for not adequately considering the effects of carbon dioxide (C02) toxicity. Specifically, for a fire in the relay room which causes a C02 initiation and a control room evacuation, C02would migrate into adjacent areas. Because operators must enter these adjacent areas to perform time critical, safe shutdown actions, the potential existed to delay or incapacitate the operators which would negatively impact the ability to safely shutdown the plant. Exelon made procedural and training changes to ensure that operators immediately don self-contained breathing apparatus in the event of a control room evacuation after a C02 initiation in the relay room. The finding was more than minor because it was associated with the external factors (fire) attribute of the Mitigating Systems Cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. This issue was found to be of very low safety significance (Green) due to the low degradation rating resulting from the minimal impact on the fire protection program. This finding did not have a cross-cutting aspect because the most significant contributor of the performance deficiency was not reflective of current licensee performance. |
| Site: | Three Mile Island  |
|---|---|
| Report | IR 05000289/2009005 Section 1R05 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | D Spindler R Bellamy H Gray E Burket D Everhart J Lilliendahl P Kaufman R Nimitz J Brand D Kern |
| INPO aspect | |
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Finding - Three Mile Island - IR 05000289/2009005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Three Mile Island) @ 2009Q4
Self-Identified List (Three Mile Island)
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