Event Notification Report for July 15, 2014
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/14/2014 - 07/15/2014
Power Reactor
Event Number: 50281
Facility: MILLSTONE
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: GERALD BAKER
HQ OPS Officer: CHARLES TEAL
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: GERALD BAKER
HQ OPS Officer: CHARLES TEAL
Notification Date: 07/15/2014
Notification Time: 13:20 [ET]
Event Date: 07/15/2014
Event Time: 09:40 [EDT]
Last Update Date: 07/15/2014
Notification Time: 13:20 [ET]
Event Date: 07/15/2014
Event Time: 09:40 [EDT]
Last Update Date: 07/15/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
CHRISTOPHER CAHILL (R1DO)
CHRISTOPHER CAHILL (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
STACK HIGH RANGE RADIATION MONITOR OUT OF SERVICE FOR PLANNED MAINTENANCE
The Unit 2 stack high range radiation monitor (RM 8169) was removed from service at 0940 EDT for planned maintenance. The monitor was returned to service at 1119 EDT after the completion of maintenance.
The licensee notified the NRC Resident Inspector, the Connecticut Department of Energy and Environmental Protection, and the city of Waterford for this event.
The Unit 2 stack high range radiation monitor (RM 8169) was removed from service at 0940 EDT for planned maintenance. The monitor was returned to service at 1119 EDT after the completion of maintenance.
The licensee notified the NRC Resident Inspector, the Connecticut Department of Energy and Environmental Protection, and the city of Waterford for this event.
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 50282
Facility: BRAIDWOOD
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: JOE CONQUEST
HQ OPS Officer: MARK ABRAMOVITZ
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: JOE CONQUEST
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 07/15/2014
Notification Time: 17:57 [ET]
Event Date: 07/15/2014
Event Time: 09:42 [CDT]
Last Update Date: 08/01/2014
Notification Time: 17:57 [ET]
Event Date: 07/15/2014
Event Time: 09:42 [CDT]
Last Update Date: 08/01/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
PATTY PELKE (R3DO)
PATTY PELKE (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 |
UNANALYZED CONDITION - LOW CONTAINMENT SPRAY FLOW RATE
"At 0942 [CDT] on 7/15/2014, the 2A Containment Spray chemical additive flow was found out of tolerance low during surveillance testing. This resulted in an unanalyzed condition in that insufficient chemical additive flow might have resulted in lower than assumed containment spray pH values during past periods.
"Based on the above, this is being reported in accordance with 10CFR50.72(b)(3)(ii)(B). Actions are in progress to restore the 2A Containment Spray chemical additive flow to within tolerance. The 2B Containment Spray system is operable per Technical Specification 3.6.6 and is capable of providing required chemical additive flow.
"The required flow is 18 to 67 gallons per minute (gpm), however, the measured flow was 17.96 gpm.
"The licensee has notified the NRC Resident Inspector."
* * * RETRACTION FROM JAMES PETTY TO JOHN SHOEMAKER AT 1729 EDT ON 8/1/14 * * *
"The purpose of this report is to retract ENS report #50282 (July 15, 2014). This ENS report was made for the 2A Containment Spray chemical additive flow which was found out of tolerance low during surveillance testing. At the time of reporting, it was concluded that this was an unanalyzed condition in that insufficient chemical additive flow may have resulted in lower than assumed containment spray pH values during past periods. This was reported in accordance with 10CFR50.72(b)(3)(11)(B) as an unanalyzed condition that significantly degrades plant safety.
"On Wednesday, July 29, 2014, Braidwood Generating Station concluded that the prior ENS notification could be retracted based on the completion of Engineering Change 398884, 'Evaluation Of 2A CS NaOH Spray Additive Test Results And Discussion of IRs 1682209 and 1683413.'
"The Engineering Change concluded that the approval of the alternate source term (AST) license amendment resulted in the elimination of a minimum containment spray (CS) spray pH value. The current containment release analysis does not credit the addition of sodium hydroxide (NaOH) to CS spray for fission product removal from the containment atmosphere. The long-term retention of captured fission products in the sump water assumes the sump water pH is greater than 7. This is established by the transfer of the containment spray additive tank (CSAT) contents to the sump during CS system operation. To transfer the maximum CSAT inventory to the sump within 8 hours, a minimum NaOH eductor flow of approximately 10 gpm is required. The minimum NaOH injection flow for the 2A CS eductor system exceeded 10 gpm so the eductor injection flows meet the criteria to transfer CSAT inventory to the containment recirculation sump within the expected minimum CS system operating time. The out of tolerance flow values recorded at the time of the initial ENS notification are acceptable.
"The licensee has notified the NRC Resident Inspector."
Notified the R3DO (Lara).
"At 0942 [CDT] on 7/15/2014, the 2A Containment Spray chemical additive flow was found out of tolerance low during surveillance testing. This resulted in an unanalyzed condition in that insufficient chemical additive flow might have resulted in lower than assumed containment spray pH values during past periods.
"Based on the above, this is being reported in accordance with 10CFR50.72(b)(3)(ii)(B). Actions are in progress to restore the 2A Containment Spray chemical additive flow to within tolerance. The 2B Containment Spray system is operable per Technical Specification 3.6.6 and is capable of providing required chemical additive flow.
"The required flow is 18 to 67 gallons per minute (gpm), however, the measured flow was 17.96 gpm.
"The licensee has notified the NRC Resident Inspector."
* * * RETRACTION FROM JAMES PETTY TO JOHN SHOEMAKER AT 1729 EDT ON 8/1/14 * * *
"The purpose of this report is to retract ENS report #50282 (July 15, 2014). This ENS report was made for the 2A Containment Spray chemical additive flow which was found out of tolerance low during surveillance testing. At the time of reporting, it was concluded that this was an unanalyzed condition in that insufficient chemical additive flow may have resulted in lower than assumed containment spray pH values during past periods. This was reported in accordance with 10CFR50.72(b)(3)(11)(B) as an unanalyzed condition that significantly degrades plant safety.
"On Wednesday, July 29, 2014, Braidwood Generating Station concluded that the prior ENS notification could be retracted based on the completion of Engineering Change 398884, 'Evaluation Of 2A CS NaOH Spray Additive Test Results And Discussion of IRs 1682209 and 1683413.'
"The Engineering Change concluded that the approval of the alternate source term (AST) license amendment resulted in the elimination of a minimum containment spray (CS) spray pH value. The current containment release analysis does not credit the addition of sodium hydroxide (NaOH) to CS spray for fission product removal from the containment atmosphere. The long-term retention of captured fission products in the sump water assumes the sump water pH is greater than 7. This is established by the transfer of the containment spray additive tank (CSAT) contents to the sump during CS system operation. To transfer the maximum CSAT inventory to the sump within 8 hours, a minimum NaOH eductor flow of approximately 10 gpm is required. The minimum NaOH injection flow for the 2A CS eductor system exceeded 10 gpm so the eductor injection flows meet the criteria to transfer CSAT inventory to the containment recirculation sump within the expected minimum CS system operating time. The out of tolerance flow values recorded at the time of the initial ENS notification are acceptable.
"The licensee has notified the NRC Resident Inspector."
Notified the R3DO (Lara).