ENS 48828
ENS Event | |
|---|---|
21:05 Mar 18, 2013 | |
| Title | Offsite Notification Due to Radioactive Release Onsite |
| Event Description | On March 18, 2013, at approximately 1605 CDT, the station commenced notification of the Louisiana Department of Environmental Quality and other offsite governmental agencies that traces of radioactive contaminants were found at the site of an underground pipe leak on station property. This leak could potentially contain tritium and cobalt-60, and is believed to have been contained on the plant site. The leakage path has been isolated. The station is currently starting up following a refueling outage.
In October 2012, water was found leaking from the ground and accumulating in a ditch near the station's sewage treatment plant. The initial investigation concluded that the source of the leak was domestic water, based on pH sample results, known buried piping in the area, and the fact that the sewage treatment plant operates intermittently. During the recent refueling outage, which started on February 16, it was noted that the leak had stopped. Testing of the potentially affected piping found that the leak was not domestic water, but was actually coming from the sewage treatment plant effluent line. It was determined that the constant leakage seen in October 2012 was due to a failed check valve in the effluent line. This check valve is designed to prevent backflow from the main condenser circulating water system blow-down line. The failed check valve was allowing water from the blow-down line to flow backwards into the sewage plant effluent line and out of the breach. The leak had stopped because the circulating water system blow-down line was shut down at the start of the refueling outage. Discharges from the liquid radwaste system also flow into the blow-down line at a point upstream of the connection to the sewage plant effluent line. During planned discharge of liquid radwaste, some of the diluted radioactive water was thus able to leak out on the ground. Samples of the dirt in the area of the leak obtained on March 17 found detectable levels of cobalt 60. No water is available to perform tritium analysis. This event is being reported in accordance with 10 CFR 50.72(b)(2)(xi) as a condition requiring notifications to local and state governmental agencies in accordance with the NEI 07-07 Industry Ground Water Protection Initiative. The leak path has been isolated. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
River Bend  Louisiana (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-3.08 h-0.128 days <br />-0.0183 weeks <br />-0.00422 months <br />) | |
| Opened: | Danny Williamson 18:00 Mar 18, 2013 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Mar 18, 2013 |
| 48828 - NRC Website
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WEEKMONTHYEARENS 549912020-11-11T00:27:00011 November 2020 00:27:00
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