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| Entered date | Event description | |
|---|---|---|
| ENS 53180 | 23 January 2018 05:02:00 | At 0400 (CST) on 1/23/2018 the Braidwood Technical Support Center (TSC) HVAC (Heating, Ventilation and Air Conditioning) Emergency Makeup Air Filter train was taken out of service to perform a planned Makeup Air Filter charcoal replacement. The TSC HVAC Makeup Air Filter train will be rendered nonfunctional during the charcoal replacement. Subsequent charcoal and HEPA filter testing will restore functionality of the TSC HVAC Makeup Air Filter train. The expected duration of the charcoal replacement and subsequent testing is 30 hours. If an emergency is declared requiring TSC activation during the time TSC HVAC is non-functional, the TSC will be staffed and activated using existing emergency planning procedure unless the TSC becomes uninhabitable due to ambient temperature, radiological, or other conditions. If relocation of the TSC becomes necessary, the Emergency Director will relocate the TSC staff to an alternate location in accordance with applicable site procedures. This notification is being made in accordance with 10 CFR 50.72(b)(3)(xiii) due to a major loss of emergency preparedness capability. An update will be provided once the TSC HVAC Emergency Makeup Air Filter train functionality has been restored. The licensee has notified the NRC Resident Inspector.
On 1/26/18 at time 1539 EST, the TSC HVAC Emergency Makeup Air Filter train was returned to service following the planned Makeup Alr Filter charcoal replacement. Functionality was verified by charcoal and HEPA filter post maintenance testing. The licensee has notified the NRC Resident Inspector. Notified the R3DO (Cameron). |
| ENS 52802 | 12 June 2017 13:50:00 | On Sunday, June 11, 2017 at 1200 CDT, a Chemistry Technician reported water from the Circulating Water Blowdown (CW B/D) valve building had been pumped onto the ground outside the CW B/D building during a maintenance activity. The sump in the CW B/D building has a sump pump discharge hose that had been routed outside to the ground near the outfall canal rather than to the permitted outfall path. Water sample analysis results confirmed the presence of tritium. The sump pump discharge hose was rerouted to the required outfall on June 11th, 2017 at 1500 CDT. The discharge flow did not leave the site boundary before reaching the permitted discharge pathway. In accordance with the Braidwood Station Illinois Environmental Protection Agency (IEPA) Consent Order dated March 11, 2010, the IEPA was notified of the blowdown line release on June 12, 2017 at 0914 CDT; the Illinois Emergency Management Agency (IEMA) was subsequently notified. Local agencies in the Braidwood area will also be notified. Follow-up analyses are being performed to determine if additional IEPA or IEMA notifications will be required. The release tank values for other radionuclides (i.e., other than tritium) were interpolated based on tritium values for the release tank, dilution from the CW B/D, and sampled sump tritium values; and determined to be less than Minimum Detectable Activity (MDA). Within 4 hours of determination that state and local agencies notification will be made, the NRC Operations Center is required to be notified. There were no public health risks associated with the event. The NRC Resident Inspector was notified. Due to the notification of government agencies, this event is being reported under 10 CFR 50.72(b)(2)(xi).
The Illinois Environmental Protection Agency (IEPA) and the Illinois Emergency Management Agency (IEMA) were notified on Wednesday, June 14, 2017, at 1206 CDT and 1213 CDT, respectively, of the preliminary results of estimated quantity of curies of tritium release (approximately 0.009 curies of tritium) and the estimated volume of the release (approximately 35,000 gallons). The discharge flow did not leave the site boundary before reaching the permitted discharge pathway. The NRC Resident Inspector was notified of the update to IEPA and IEMA. Notified R3DO (Stone).
The Illinois Environmental Protection Agency (IEPA) and the Illinois Emergency Management Agency (IEMA) were provided with a follow-up report on June 16, 2017, at 1528 CDT as required by 35 IAC 1010.204. The report includes the estimated quantity of curies of tritium released (approximately 0.009 curies), the estimated volume of the release (approximately 35,000 gallons), and actions taken in response to the on-site release (installation of groundwater monitoring wells, implementation of a sampling program to monitor the concentrations and migration, if any, of the tritium in the groundwater on-site, and the installation of a remediation system). The NRC Resident Inspectors have been notified of the update to IEPA and IEMA. Notified R3DO (Stone).
On 6/20/2017, the Illinois Environmental Protection Agency (IEPA) Des Plaines Regional Office was sent a follow-up report pursuant to the Consent Order, dated March 11, 2010. This report contains that same information as the follow-up report required by 35 IAC 1010.204 that was submitted to the IEPA and the Illinois Emergency Management Agency on June 16. 2017. The NRC Resident Inspector has been notified of the update to IEPA. Notified R3DO (Pelke). |
| ENS 52103 | 18 July 2016 23:20:00 | Loss of the Offsite Emergency Response Organization (ERO) notification system (Everbridge) identified the system cannot notify all ERO individuals. This constitutes a loss of offsite communications capability. The Offsite ERO notification system (Everbridge) capability loss of Braidwood was identified at approximately 1500 CDT on July 18, 2016, due to an undetermined loss of system communications, which is currently being investigated. The Offsite ERO notification system (Everbridge) capability loss for the common Emergency Response Facility (ERF) (Emergency Offsite Facility (EOF) at Cantera) was identified at approximately 1500 CDT on July 18, 2016. The issue has subsequently been reported resolved by the vendor at 1912 CDT and site testing has verified resolution at 2108 CDT. The onsite communication system was not affected. This event is reportable under 10 CFR 50.72(b)(3)(xiii) as a loss of communications capability. The NRC Resident Inspector has been notified. |