Vermont Yankee begins remediation planning of contaminated area

first_imgVermont Yankee reports that engineers and technicians continue their investigation into the source of tritium in the plant’s groundwater and have commenced soil and groundwater remediation planning. Tritium, a radioactive isotope of hydrogen associated with nuclear fission, was first identified in a test well at the nuclear power plant in Vernon in January.According to a Vermont Yankee statement, sample results from all the monitoring wells remain consistent with inspectors’ expectations and increased understanding of the movement of groundwater in the Advanced Off Gas courtyard. The information being provided is helping hydrologists to characterize the tritium concentration in that area and is assisting engineers in developing plans for remediation work. Upcoming near term activities include taking additional soil samples in the area near the previously identified leakage pathway and the use of guided wave technology to confirm the integrity of other hard to reach piping systems.According to a Vermont Yankee statement, the temporary piping modification involving the rerouting of the two drainlines to eliminate the leak pathway from the AOG drainlines into the tunnel is in progress. The rerouting of the Bravo ‘B’ drainline will be completed today, allowing the switchover from the ‘A” train to the ‘B’ AOG recombiner train. ROV camera inspections of the tunnel will be conducted at that time, followed by the rerouting of the ‘A” drainline. The rerouting work is scheduled to be completed later in the week. This leak in the AOG tunnel is being collected in a sump for processing through plant systems as designed. It is not reaching the environment.While this investigation continues, it is important to note that there has been no detectable tritium levels found in any samples taken from drinking water wells or the adjacent Connecticut River. The Vermont Department of Health and Nuclear Regulatory Commission personnel are monitoring the investigation.Source: Entergy Vermont Yankee. 3.16.2010last_img

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