Event Notification Report for April 12, 2023
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/11/2023 - 04/12/2023
Part 21
Event Number: 56469
Rep Org: United Controls International
Licensee: United Controls International
Region: 1
City: Norcross State: GA
County:
License #:
Agreement: N
Docket:
NRC Notified By: Anu Kulkarni
HQ OPS Officer: Sam Colvard
Licensee: United Controls International
Region: 1
City: Norcross State: GA
County:
License #:
Agreement: N
Docket:
NRC Notified By: Anu Kulkarni
HQ OPS Officer: Sam Colvard
Notification Date: 04/14/2023
Notification Time: 07:53 [ET]
Event Date: 04/12/2023
Event Time: 00:00 [EDT]
Last Update Date: 04/14/2023
Notification Time: 07:53 [ET]
Event Date: 04/12/2023
Event Time: 00:00 [EDT]
Last Update Date: 04/14/2023
Emergency Class: Non Emergency
10 CFR Section:
21.21(d)(3)(i) - Defects And Noncompliance
10 CFR Section:
21.21(d)(3)(i) - Defects And Noncompliance
Person (Organization):
Lilliendahl, Jon (R1DO)
Miller, Mark (R2DO)
Part 21/50.55 Reactors, - (EMAIL)
Lilliendahl, Jon (R1DO)
Miller, Mark (R2DO)
Part 21/50.55 Reactors, - (EMAIL)
PART 21 - SCHNEIDER ELECTRIC POWER SUPPLY HARD FAILURES
The following information was provided by the licensee via email:
"On September 7, 2022, Dominion's Surry Power Station notified United Controls International (UCI) that three Schneider Electric PIN: ASP840-000 Modicon Primary/Secondary Power Supply units that were supplied by UCI in 2014 had failed after installation. Hard failures that shutdown the associated programmable logic controller were observed. The first unit was installed since June 6, 2017, and then failed in August of 2022. The second and third units failed approximately three days after installation. All units appeared to function properly at initial installation.
"The subject items were returned to UCI on October 19, 2022, for evaluation. Items were received at UCI with substantial shipping damage noted. One item was received with a loose transformer inside the unit. All items were received with bent or cracked cases. These issues are attributed to poor shipping practices as items were not supplied in such conditions and these issues would have been noted at receipt by the utility. Due to the complexity of the items and unavailability of design documentation for these obsolete items, further evaluation of item failures required manufacturer (Schneider Electric) evaluation. UCI returned all three items to the manufacturer for evaluation of failed components. The manufacturer was able to repair one item by replacing several capacitors, transistors, integrated circuits, and resistors; however, a specific cause of the failure could not be identified. The remaining two items were determined to be unrepairable, and cause of failure could not be identified.
"UCI is not capable of providing any further evaluation as to the root cause of the subject module failures. The item manufacturer Schneider Electric was also unable to provide a determination as to the cause of failure. Since the root cause of failure cannot be determined or inspected for, UCI will no longer be supplying these modules which are now obsolete."
North Anna and Surry Power Station are the plants affected.
The following information was provided by the licensee via email:
"On September 7, 2022, Dominion's Surry Power Station notified United Controls International (UCI) that three Schneider Electric PIN: ASP840-000 Modicon Primary/Secondary Power Supply units that were supplied by UCI in 2014 had failed after installation. Hard failures that shutdown the associated programmable logic controller were observed. The first unit was installed since June 6, 2017, and then failed in August of 2022. The second and third units failed approximately three days after installation. All units appeared to function properly at initial installation.
"The subject items were returned to UCI on October 19, 2022, for evaluation. Items were received at UCI with substantial shipping damage noted. One item was received with a loose transformer inside the unit. All items were received with bent or cracked cases. These issues are attributed to poor shipping practices as items were not supplied in such conditions and these issues would have been noted at receipt by the utility. Due to the complexity of the items and unavailability of design documentation for these obsolete items, further evaluation of item failures required manufacturer (Schneider Electric) evaluation. UCI returned all three items to the manufacturer for evaluation of failed components. The manufacturer was able to repair one item by replacing several capacitors, transistors, integrated circuits, and resistors; however, a specific cause of the failure could not be identified. The remaining two items were determined to be unrepairable, and cause of failure could not be identified.
"UCI is not capable of providing any further evaluation as to the root cause of the subject module failures. The item manufacturer Schneider Electric was also unable to provide a determination as to the cause of failure. Since the root cause of failure cannot be determined or inspected for, UCI will no longer be supplying these modules which are now obsolete."
North Anna and Surry Power Station are the plants affected.
Power Reactor
Event Number: 56564
Facility: Seabrook
Region: 1 State: NH
Unit: [1] [] []
RX Type: [1] W-4-LP
NRC Notified By: Andrew Ferraioli
HQ OPS Officer: Kerby Scales
Region: 1 State: NH
Unit: [1] [] []
RX Type: [1] W-4-LP
NRC Notified By: Andrew Ferraioli
HQ OPS Officer: Kerby Scales
Notification Date: 06/08/2023
Notification Time: 09:37 [ET]
Event Date: 04/12/2023
Event Time: 11:07 [EDT]
Last Update Date: 06/08/2023
Notification Time: 09:37 [ET]
Event Date: 04/12/2023
Event Time: 11:07 [EDT]
Last Update Date: 06/08/2023
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
10 CFR Section:
50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
Person (Organization):
Werkheiser, Dave (R1DO)
Werkheiser, Dave (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Refueling | 100 | Power Operation |
AUTOMATIC ACTUATION OF "B" EMERGENCY DIESEL GENERATOR EMERGENCY POWER SEQUENCER
The following information was provided by the licensee via email:
"On April 12, 2023, with Seabrook Station Unit 1 in Mode 6 at zero percent power, a valid actuation of the 'B' emergency diesel generator (EDG) emergency power sequencer occurred due to a loss of power to the 'B' train emergency bus. The 'B' EDG was removed from service for scheduled maintenance during this time.
"This event is being reported pursuant to 10 CFR 50.72(b)(3)(iv)(A) for a valid actuation of the 'B' EDG emergency power sequencer.
"The NRC Resident Inspector has been notified."
The following information was provided by the licensee via email:
"On April 12, 2023, with Seabrook Station Unit 1 in Mode 6 at zero percent power, a valid actuation of the 'B' emergency diesel generator (EDG) emergency power sequencer occurred due to a loss of power to the 'B' train emergency bus. The 'B' EDG was removed from service for scheduled maintenance during this time.
"This event is being reported pursuant to 10 CFR 50.72(b)(3)(iv)(A) for a valid actuation of the 'B' EDG emergency power sequencer.
"The NRC Resident Inspector has been notified."