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Event Notification Report for May 31, 2017

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
05/30/2017 - 05/31/2017

** EVENT NUMBERS **


52775 52777

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Power Reactor Event Number: 52775
Facility: SOUTH TEXAS
Region: 4 State: TX
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: WILLIAM HERZOG
HQ OPS Officer: JEFF ROTTON
Notification Date: 05/30/2017
Notification Time: 14:10 [ET]
Event Date: 05/30/2017
Event Time: 09:29 [CDT]
Last Update Date: 05/30/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
NEIL OKEEFE (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
2 N Y 100 Power Operation 100 Power Operation

Event Text

LOSS OF EMERGENCY OPERATIONS FACILITY INTEGRATED COMPUTER SYSTEM DATA FOR PLANNED MAINTENANCE

"On May 30, 2017 at 0929 (CDT), South Texas Project (STP) removed from service Integrated Computer System (ICS) connections to the Emergency Operations Facility (EOF) for planned maintenance. The ICS computers are used in the EOF to directly monitor selected plant parameters and to provide Emergency Response assessment capabilities. This planned maintenance implements a software modification and is expected to last for four days.

"This is reportable under 10 CFR 50.72(b)(3)(xiii) because the EOF assessment capabilities would not be able to be restored within the facility activation time and assessment capabilities cannot be performed at a backup facility (i.e., there is no backup EOF).

"While ICS connections in the EOF are out of service, if the Emergency Plan is entered and the Technical Support Center (TSC) and EOF are staffed, the EOF will not activate and Emergency Director authority will remain in the TSC. The Emergency Response Organization team members that report to the EOF and TSC have been notified regarding the status of the ICS computers in the EOF.

"The planned modification that impacts the ICS computers in the EOF does not affect the health and safety of the public or station employees. The NRC Resident Inspector has been notified."

The licensee notified the Matagorda County Sheriff, and the State of Texas Department of Public Safety and the Department of State Health Services.

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Power Reactor Event Number: 52777
Facility: CLINTON
Region: 3 State: IL
Unit: [1] [ ] [ ]
RX Type: [1] GE-6
NRC Notified By: GLENN BENJAMIN
HQ OPS Officer: JEFF ROTTON
Notification Date: 05/30/2017
Notification Time: 22:22 [ET]
Event Date: 05/30/2017
Event Time: 20:38 [CDT]
Last Update Date: 05/30/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
ROBERT DALEY (R3DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 A/R Y 28 Power Operation 0 Hot Shutdown

Event Text

AUTOMATIC REACTOR SCRAM

"At 2038 [CDT], Clinton Power Station received an automatic RPS [Reactor Protection System]actuation. EOP-1 [Emergency Operating Procedure] was entered on RPV [Reactor Pressure Vessel] Level 3. The cause of the scram is unknown at this time. All systems responded appropriately following the scram and the plant is currently stable."

Reactor level is being maintained by normal feedwater and decay heat is being removed to the main condenser via the steam dump bypass valves. The plant is in a normal shutdown electrical lineup. The plant main generator was synchronized to the electrical grid and the plant was conducting control rod scram time testing at the time of the reactor trip.

The licensee notified the NRC Resident Inspector.

Page Last Reviewed/Updated Wednesday, May 31, 2017
Wednesday, May 31, 2017