Event Notification Report for October 20, 2012
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/19/2012 - 10/20/2012
Power Reactor
Event Number: 48426
Facility: DRESDEN
Region: 3 State: IL
Unit: [] [2] [3]
RX Type: [1] GE-1,[2] GE-3,[3] GE-3
NRC Notified By: OWEN SHOGER
HQ OPS Officer: MARK ABRAMOVITZ
Region: 3 State: IL
Unit: [] [2] [3]
RX Type: [1] GE-1,[2] GE-3,[3] GE-3
NRC Notified By: OWEN SHOGER
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 10/20/2012
Notification Time: 15:09 [ET]
Event Date: 10/20/2012
Event Time: 11:00 [CDT]
Last Update Date: 10/20/2012
Notification Time: 15:09 [ET]
Event Date: 10/20/2012
Event Time: 11:00 [CDT]
Last Update Date: 10/20/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
Person (Organization):
STEVE ORTH (R3DO)
STEVE ORTH (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
| 3 | N | Y | 100 | Power Operation | 100 | Power Operation |
OFFSITE NOTIFICATION DUE TO A POTENTIAL INADVERTENT RELEASE OF TRITIUM
"The notification is being made pursuant to 10 CFR 50.72(b )(2)(xi) due to the fact that Exelon Nuclear has informed the Illinois Emergency Management Agency (lEMA) and the Illinois Environmental Protection Agency (IEPA) of the discovery of a hole in the 'A' Waste Sample Tank resulting in a potential inadvertent release of tritium at Dresden Station. Any release is currently contained within the plant's restricted area. The notifications to lEMA and IEPA were made at 1340 hours CDT on October 20, 2012.
"The tank was out of service and had been emptied for internal inspection. Therefore at the time of discovery, there was no active leak.
"The IEPA/lEMA regulations require notification when newly occurring, event-related unpermitted releases of radionuclides are identified. A release has not been confirmed but is suspected. A review of the historical groundwater monitoring well data trends and trending analysis from wells in proximity to the tank indicates no impact on groundwater. Further investigation of the groundwater in the area of the tank is ongoing to determine if an actual release has occurred. The potential leak was not released to an unrestricted area; therefore there is no anticipated adverse impact to the health and safety of the public.
"Since there was no release to an unrestricted area, 10 CFR Part 20 limits were not impacted.
"The licensee has notified the NRC Resident Inspector."
The Waste Sample Tank normally contains processed rad waste water. The hole was found at the bottom of the tank.
"The notification is being made pursuant to 10 CFR 50.72(b )(2)(xi) due to the fact that Exelon Nuclear has informed the Illinois Emergency Management Agency (lEMA) and the Illinois Environmental Protection Agency (IEPA) of the discovery of a hole in the 'A' Waste Sample Tank resulting in a potential inadvertent release of tritium at Dresden Station. Any release is currently contained within the plant's restricted area. The notifications to lEMA and IEPA were made at 1340 hours CDT on October 20, 2012.
"The tank was out of service and had been emptied for internal inspection. Therefore at the time of discovery, there was no active leak.
"The IEPA/lEMA regulations require notification when newly occurring, event-related unpermitted releases of radionuclides are identified. A release has not been confirmed but is suspected. A review of the historical groundwater monitoring well data trends and trending analysis from wells in proximity to the tank indicates no impact on groundwater. Further investigation of the groundwater in the area of the tank is ongoing to determine if an actual release has occurred. The potential leak was not released to an unrestricted area; therefore there is no anticipated adverse impact to the health and safety of the public.
"Since there was no release to an unrestricted area, 10 CFR Part 20 limits were not impacted.
"The licensee has notified the NRC Resident Inspector."
The Waste Sample Tank normally contains processed rad waste water. The hole was found at the bottom of the tank.
Power Reactor
Event Number: 48601
Facility: DUANE ARNOLD
Region: 3 State: IA
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: BOB MURRELL
HQ OPS Officer: BILL HUFFMAN
Region: 3 State: IA
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: BOB MURRELL
HQ OPS Officer: BILL HUFFMAN
Notification Date: 12/18/2012
Notification Time: 11:20 [ET]
Event Date: 10/20/2012
Event Time: 19:20 [CST]
Last Update Date: 12/18/2012
Notification Time: 11:20 [ET]
Event Date: 10/20/2012
Event Time: 19:20 [CST]
Last Update Date: 12/18/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION
10 CFR Section:
50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION
Person (Organization):
KENNETH RIEMER (R3DO)
KENNETH RIEMER (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Refueling | 0 | Refueling |
60 DAY OPTIONAL TELEPHONIC NOTIFICATION OF INVALID PRIMARY CONTAINMENT ISOLATION SYSTEM (PCIS) ACTUATION
"This 60-day telephone notification is being made under reporting requirements specified by 10CFR50.73(a)(2)(iv)(A) to describe an invalid actuation of a containment isolation signal affecting more than one system.
"At 1920 on October 20, 2012, with the Duane Arnold Energy Center (DAEC) shut down for a preplanned refueling outage, an invalid Group 3 isolation on the 'A' side of the Primary Containment Isolation System occurred. Group 3 isolation signals were generated for Primary Containment Isolation Valves for Drywell and Torus Ventilation, and Purge, Containment Nitrogen Compressor Suction and Discharge, Recirculation Pump Seals, and Post Accident Sample System.
"This event was caused by failed components in the power supply circuitry for the 'A' Refuel Floor Exhaust Radiation Monitor.
"All equipment responded in accordance with the plant design. Specifically, all actuations were complete and successful.
"There were no safety consequences or impacts on the health and safety of the public. The event was entered into DAEC's corrective action program for resolution.
"The licensee notified the NRC Resident Inspector."
"This 60-day telephone notification is being made under reporting requirements specified by 10CFR50.73(a)(2)(iv)(A) to describe an invalid actuation of a containment isolation signal affecting more than one system.
"At 1920 on October 20, 2012, with the Duane Arnold Energy Center (DAEC) shut down for a preplanned refueling outage, an invalid Group 3 isolation on the 'A' side of the Primary Containment Isolation System occurred. Group 3 isolation signals were generated for Primary Containment Isolation Valves for Drywell and Torus Ventilation, and Purge, Containment Nitrogen Compressor Suction and Discharge, Recirculation Pump Seals, and Post Accident Sample System.
"This event was caused by failed components in the power supply circuitry for the 'A' Refuel Floor Exhaust Radiation Monitor.
"All equipment responded in accordance with the plant design. Specifically, all actuations were complete and successful.
"There were no safety consequences or impacts on the health and safety of the public. The event was entered into DAEC's corrective action program for resolution.
"The licensee notified the NRC Resident Inspector."