Event Notification Report for January 08, 2021

U.S. Nuclear Regulatory Commission
Operations Center

EVENT REPORTS FOR
01/07/2021 - 01/08/2021

EVENT NUMBERS
55056 55058
Power Reactor Event Number: 55056
Facility: Grand Gulf
Region: 4     State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: Leroy Purdy
HQ OPS Officer: Brian Lin
Notification Date: 01/07/2021
Notification Time: 03:18 [ET]
Event Date: 01/07/2021
Event Time: 01:24 [CST]
Last Update Date: 01/07/2021
Emergency Class: Unusual Event
10 CFR Section:
50.72(a) (1) (i) - Emergency Declared
Person (Organization):
JASON KOZAL (R4DO)
WILLIAM GOTT (IR)
RUSS FELTS (NRR EO)
HO NIEH (NRR)
SCOTT MORRIS (R4 RA)
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
EN Revision Imported Date: 1/8/2021

EN Revision Text: UNUSUAL EVENT DECLARED DUE TO RISE IN DRYWELL UNIDENTIFIED REACTOR COOLANT SYSTEM LEAKAGE

"An Unusual Event was declared at Grand Gulf Nuclear Station at 0124 [CST] on 01/07/2021 due to Unidentified Drywell Leakage exceeding 10 GPM for 15 minutes. Unidentified leakage has reduced to less than 0.44 GPM as of 0213 CST on 01/07/2021."

The cause of the increase leakage rate is under investigation.

The licensee notified the NRC Resident Inspector.

Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).

* * * UPDATE ON 01/07/21 AT 0619 EST FROM LEROY PURDY TO BRIAN LIN * * *

At 0356 CST, Grand Gulf Nuclear Station terminated the Unusual Event following plant parameters returning to normal. The current leakage rate is 0.3 gallons per minute and stable. The NRC Resident Inspector has been notified.

Notified R4DO (Kozal), IRD MOC (Gott), NRR EO (Felts), DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).


Power Reactor Event Number: 55058
Facility: Diablo Canyon
Region: 4     State: CA
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Don Townsend
HQ OPS Officer: Thomas Herrity
Notification Date: 01/07/2021
Notification Time: 18:51 [ET]
Event Date: 01/07/2021
Event Time: 07:43 [PST]
Last Update Date: 01/07/2021
Emergency Class: Non Emergency
10 CFR Section:
26.719 - Fitness For Duty
Person (Organization):
JASON KOZAL (R4DO)
FFD GROUP (EMAIL)
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
FITNESS FOR DUTY REPORT

A non-licensed employee supervisor had a confirmed positive for alcohol during a follow-up test. The employee's access to the plant has been terminated.

The licensee informed the NRC Resident Inspector.

Page Last Reviewed/Updated Friday, January 08, 2021