United States Nuclear Regulatory Commission - Protecting People and the Environment
Home > NRC Library > Document Collections > Reports Associated with Events > Event Notification Reports > 2017 > June 21

Event Notification Report for June 21, 2017

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
06/20/2017 - 06/21/2017

** EVENT NUMBERS **


52802 52813 52814

To top of page
Power Reactor Event Number: 52802
Facility: BRAIDWOOD
Region: 3 State: IL
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: RYAN CRAGG
HQ OPS Officer: BETHANY CECERE
Notification Date: 06/12/2017
Notification Time: 13:50 [ET]
Event Date: 06/12/2017
Event Time: 09:14 [CDT]
Last Update Date: 06/20/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
OTHER UNSPEC REQMNT
Person (Organization):
ANN MARIE STONE (R3DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
2 N Y 100 Power Operation 100 Power Operation

Event Text

OFFSITE NOTIFICATION FOR DISCHARGE OF CIRCULATING WATER

"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)."

* * * UPDATE ON 6/14/17 AT 1650 EDT FROM JOHN LOGAN TO DONG PARK * * *

"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).

* * * UPDATE FROM CRAIG FOBERT TO HOWIE CROUCH AT 1656 EDT ON 6/16/17 * * *

"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).

* * * UPDATE ON 6/20/17 AT 1435 EDT FROM MIKE NOLAN TO BETHANY CECERE * * *

"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).

To top of page
Power Reactor Event Number: 52813
Facility: COOPER
Region: 4 State: NE
Unit: [1] [ ] [ ]
RX Type: [1] GE-4
NRC Notified By: ARIC HARRIS
HQ OPS Officer: DONALD NORWOOD
Notification Date: 06/20/2017
Notification Time: 03:31 [ET]
Event Date: 06/19/2017
Event Time: 21:15 [CDT]
Last Update Date: 06/20/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
VINCENT GADDY (R4DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation

Event Text

PRIMARY CONTAINMENT DECLARED INOPERABLE DUE TO FAILURE OF DRYWELL TO SUPPRESSION CHAMBER VACUUM BREAKER TO FULLY CLOSE

"This report is being made pursuant to 10 CFR 50.72(b)(3)(v)(D), 'any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident.'

"At time 2115 CDT on June 19, 2017, one torus to drywell vacuum breaker failed to indicate that it was closed after being cycled for surveillance testing. The vacuum breaker had been cycled open and then closed to satisfy SR 3.6.1.8.2 - Perform a functional test of each required vacuum breaker. Failure of the vacuum breaker to indicate closed after the control switch was taken to the closed position represents a failure to satisfy SR 3.6.1.8.2 and SR 3.6.1.8.1 - Verify each vacuum breaker is closed. Primary containment is allowed to have a bypass area between the drywell and suppression chamber less than or equivalent to a one inch diameter hole. The are of bypass was indeterminate while the vacuum breaker did not indicate fully closed. Primary containment was declared inoperable during the time the vacuum breaker did not indicate fully closed.

"The vacuum breaker control switch was subsequently cycled open and closed one additional time. At time 2311 CDT, the vacuum breaker indicated fully closed. At that time, primary containment was declared operable.

"Currently, all twelve Drywell to Suppression Chamber vacuum relief valves are closed and in the normal line-up.

"The NRC Senior Resident Inspector has been notified."

To top of page
Power Reactor Event Number: 52814
Facility: MONTICELLO
Region: 3 State: MN
Unit: [1] [ ] [ ]
RX Type: [1] GE-3
NRC Notified By: SCOTT CHRISTOS
HQ OPS Officer: DONALD NORWOOD
Notification Date: 06/20/2017
Notification Time: 08:18 [ET]
Event Date: 06/19/2017
Event Time: 23:53 [CDT]
Last Update Date: 06/20/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
PATRICIA PELKE (R3DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation

Event Text

HIGH PRESSURE COOLANT INJECTION INOPERABLE

"At 2353 CDT on 6/19/2017, while performing the High Pressure Coolant Injection (HPCI) quarterly surveillance following planned maintenance, the HPCI turbine did not start as expected due to the HPCI turbine stop valve failing to open. This issue is being reported under 10 CFR 50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of a safety function at the time of discovery. Investigation into the failure of the HPCI system to start is in progress. The unit remains at 100% power. The health and safety of the public was not affected.

"The NRC Resident Inspector has been notified."

Page Last Reviewed/Updated Wednesday, June 21, 2017
Wednesday, June 21, 2017