05000255/FIN-2008004-03
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Finding | |
|---|---|
| Title | Unexpected Activity Through Turbine Building Monitor During Gas Release |
| Description | During Condition Report (CR) review, the inspectors noted that CR-PLP-2008-03433 documented a situation in mode three where control room operators received an unexpected alarm from the condenser off-gas monitor RIA-0631 in the turbine building. The alarm was received about four minutes after commencing a waste gas decay tank release. The normal exhaust path for waste gas and other gasses with activity is up and out of the plant stack. The licensee initially evaluated the alarm as spurious and closed the CR during the Condition Report Review Group meeting. The inspectors reviewed historical charts of both the stack activity and the condenser off-gas activity and concluded that the alarm was not an electrical anomaly because the gas activity trends showed an increase of activity flowing to the turbine building during the release. The inspectors determined that if the flow of all gaseous activity was not out through the stack as assumed in the UFSAR, then there could be an impact on the sites dose calculations. The licensee wrote CR-PLP-2008-3626 and CR-PLP-2008-4104. The mechanism for activity to flow to the turbine building is not known and a review of the CR database revealed a similar occurrence in 2007. Until the cause evaluation of the activity flow to the turbine building and the impact on licensing basis dose calculations are completed and reviewed by the NRC, this item will remain an unresolved item: URI 05000255/2008004-03, Unexpected Activity Detected in Condenser Off-gas During Waste Gas Release. |
| Site: | Palisades  |
|---|---|
| Report | IR 05000255/2008004 Section 4OA2 |
| Date counted | Sep 30, 2008 (2008Q3) |
| Type: | URI: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | J Cassidy J Ellegood V Meghani J Giessner F Tran P Laflamme T Taylorn Valosj Ellegood J Giessner T Taylor |
| INPO aspect | |
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Finding - Palisades - IR 05000255/2008004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palisades) @ 2008Q3
Self-Identified List (Palisades)
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