ENS 50180
ENS Event | |
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21:15 Jun 8, 2014 | |
Title | Offsite Notification Due to Tritium Discovered in Onsite Well |
Event Description | This notification is being made pursuant to 10 CFR 50.72(b)(2)(xi) because Dresden Nuclear Power Station is in the process of informing the Illinois Emergency Management Agency (lEMA) and Illinois Environmental Protection Agency (IEPA) of recent groundwater monitoring results at Dresden Station. Additionally, the station intends to issue a press release.
As part of the Station's extensive environmental monitoring and sampling program, sample results from an onsite sampling well near the 2/3 contaminated water storage tank (CST) indicate elevated levels of tritium. This is an on-site leak, requiring the notification of the State of Illinois. Based on sampling data obtained, the tritium is currently confined to Exelon property. The IEPA/lEMA regulation requires notification when a release to soil, groundwater or surface water goes offsite at greater than 200 pCi/L or remains on-site greater than 0.002 Curies. Based upon the sampling results from the monitoring well near the 2/3 CST with a concentration of approximately 0.0000013 Curies/liter it is likely that the 0.002 Curie on-site threshold has been exceeded. The Station continues to track this issue by monitoring the existing wells and initiation of mitigative actions to contain any release and ensure it remains on-site. At this time, the source of the tritium has not been identified. Investigation continues to determine if an off-site release occurred. The licensee has notified the NRC Resident Inspector.
At 1830 [CDT], the station notified IEPA/IEMA, pursuant to 35 ILL. ADM. Code 1010.202, that from the time period of April 2, 2014, to June 8, 2014, elevated levels of tritium existed at the discharge of the plant. As part of the site investigation that was done in response to the event reported in EN 50180, it has been determined that no greater than 0.1 Curies were discharged from the site. The majority of this discharge was to the Kankakee River via the sewage treatment plant effluent. A small amount, determined to be less than 2%, was discharged to the Morris Illinois sewage treatment facility. This release is associated with the elevated tritium levels discovered on June 7, 2014 and reported to the IEPA on June 8, 2014. The system is currently isolated, and is not discharging to the Kankakee River. The licensee notified the NRC Resident Inspector. Notified the R3DO (Daley). |
Where | |
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Dresden Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
Time - Person (Reporting Time:+-4.2 h-0.175 days <br />-0.025 weeks <br />-0.00575 months <br />) | |
Opened: | Edward Burns 17:03 Jun 8, 2014 |
NRC Officer: | Howie Crouch |
Last Updated: | Jun 9, 2014 |
50180 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 3 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 557212022-02-01T16:25:0001 February 2022 16:25:00
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