Event Notification Report for April 22, 2021
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/21/2021 - 04/22/2021
Power Reactor
Event Number: 55205
Facility: Palo Verde
Region: 4 State: AZ
Unit: [1] [2] [3]
RX Type: [1] CE,[2] CE,[3] CE
NRC Notified By: Diego Gil-Azamar
HQ OPS Officer: Solomon Sahle
Region: 4 State: AZ
Unit: [1] [2] [3]
RX Type: [1] CE,[2] CE,[3] CE
NRC Notified By: Diego Gil-Azamar
HQ OPS Officer: Solomon Sahle
Notification Date: 04/22/2021
Notification Time: 15:41 [ET]
Event Date: 04/22/2021
Event Time: 09:25 [MST]
Last Update Date: 04/22/2021
Notification Time: 15:41 [ET]
Event Date: 04/22/2021
Event Time: 09:25 [MST]
Last Update Date: 04/22/2021
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(xi) - Offsite Notification
10 CFR Section:
50.72(b)(2)(xi) - Offsite Notification
Person (Organization):
AZUA, RAY (R4)
AZUA, RAY (R4)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 100 | Power Operation | 100 | Power Operation |
| 2 | N | N | 100 | Power Operation | 100 | Power Operation |
| 3 | N | N | 0 | Power Operation | 0 | Power Operation |
EN Revision Imported Date: 5/21/2021
EN Revision Text: INADVERTANT ACTIVATION OF EMERGENCY SIRENS
At 0925 Mountain Standard Time (MST) on April 22, 2021, Palo Verde Nuclear Generating Station staff received reports that Emergency Notification sirens were activated. Current information indicates that the inadvertent activation of the sirens was caused by an offsite agency during performance of a planned silent test that occurred at approximately 0916 MST. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi).
All sirens remain functional, and the NRC Resident Inspectors have been notified of the issue.
Additional notifications will be made as needed.
EN Revision Text: INADVERTANT ACTIVATION OF EMERGENCY SIRENS
At 0925 Mountain Standard Time (MST) on April 22, 2021, Palo Verde Nuclear Generating Station staff received reports that Emergency Notification sirens were activated. Current information indicates that the inadvertent activation of the sirens was caused by an offsite agency during performance of a planned silent test that occurred at approximately 0916 MST. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi).
All sirens remain functional, and the NRC Resident Inspectors have been notified of the issue.
Additional notifications will be made as needed.
Power Reactor
Event Number: 55206
Facility: Farley
Region: 2 State: AL
Unit: [1] [] []
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: Richard Langford
HQ OPS Officer: Brian P. Smith
Region: 2 State: AL
Unit: [1] [] []
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: Richard Langford
HQ OPS Officer: Brian P. Smith
Notification Date: 04/22/2021
Notification Time: 17:17 [ET]
Event Date: 04/22/2021
Event Time: 14:50 [CDT]
Last Update Date: 04/22/2021
Notification Time: 17:17 [ET]
Event Date: 04/22/2021
Event Time: 14:50 [CDT]
Last Update Date: 04/22/2021
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS Actuation - Critical
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS Actuation - Critical
Person (Organization):
MARK MILLER (R2DO)
MARK MILLER (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 48 | Power Operation | 0 | Hot Standby |
EN Revision Imported Date: 5/21/2021
EN Revision Text: AUTOMATIC REACTOR TRIP DUE TO TURBINE TRIP
"At 1450 CDT on April 22, 2021, with Unit 1 in Mode 1 at 48 percent reactor power, the reactor automatically tripped due to a turbine trip. The trip was not complex with all systems responding normally post-trip.
"Operations responded and stabilized the plant. Auxiliary feedwater pumps were manually started using operations procedures. Main steam isolation valves were closed to prevent excessive cooldown. Decay heat is being removed by the steam generators through the main steam system via atmospheric relief valves. Unit 2 is not affected.
"Due to the Reactor Protection System actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).
"There was no impact on the health and safety of the public or plant personnel."
The Resident Inspector has been notified.
EN Revision Text: AUTOMATIC REACTOR TRIP DUE TO TURBINE TRIP
"At 1450 CDT on April 22, 2021, with Unit 1 in Mode 1 at 48 percent reactor power, the reactor automatically tripped due to a turbine trip. The trip was not complex with all systems responding normally post-trip.
"Operations responded and stabilized the plant. Auxiliary feedwater pumps were manually started using operations procedures. Main steam isolation valves were closed to prevent excessive cooldown. Decay heat is being removed by the steam generators through the main steam system via atmospheric relief valves. Unit 2 is not affected.
"Due to the Reactor Protection System actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).
"There was no impact on the health and safety of the public or plant personnel."
The Resident Inspector has been notified.
Agreement State
Event Number: 55207
Rep Org: NEVADA RADIOLOGICAL HEALTH
Licensee: HC Companies Inc.
Region: 4
City: Sparks State: NV
County:
License #: N/A
Agreement: Y
Docket:
NRC Notified By: Cory Creveling
HQ OPS Officer: Ossy Font
Licensee: HC Companies Inc.
Region: 4
City: Sparks State: NV
County:
License #: N/A
Agreement: Y
Docket:
NRC Notified By: Cory Creveling
HQ OPS Officer: Ossy Font
Notification Date: 04/22/2021
Notification Time: 17:23 [ET]
Event Date: 04/22/2021
Event Time: 11:20 [PDT]
Last Update Date: 04/23/2021
Notification Time: 17:23 [ET]
Event Date: 04/22/2021
Event Time: 11:20 [PDT]
Last Update Date: 04/23/2021
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
AZUA, RAY (R4DO)
NMSS_EVENTS_NOTIFICATION, (EMAIL)
ILTAB, (EMAIL)
AZUA, RAY (R4DO)
NMSS_EVENTS_NOTIFICATION, (EMAIL)
ILTAB, (EMAIL)
EN Revision Imported Date: 5/21/2021
EN Revision Text: AGREEMENT STATE REPORT - UNREGISTERED GAUGES FOUND THEN ONE LOST
The following is a summary of a phone call from the state of Nevada:
A plant manager for the HC Companies Inc. was performing a walkthrough when three NDC-102 thickness gauges were discovered. The manager was familiar with the gauges from a different site, but this site did not have any registered, nor does this site have a license for any material. The gauges, potentially only requiring a general license, were moved and the corporate safety group notified in order to secure them. When the safety group arrived, one of the gauges was missing (s/n: 2690; source: 150 mCi of Am-241).
Item Number: NV210004
* * * UPDATE ON 4/23/2021 AT 1720 EDT FROM COREY CREVELING TO THOMAS KENDZIA * * *
The state of Nevada sent a picture of the missing source via email:
The picture confirms the the previous information and the date of the radiological strength was 1/92.
Notified: R4DO (Azua) (email), NMSS Event Notifications (email), and ILTAB (email).
THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL
Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf
EN Revision Text: AGREEMENT STATE REPORT - UNREGISTERED GAUGES FOUND THEN ONE LOST
The following is a summary of a phone call from the state of Nevada:
A plant manager for the HC Companies Inc. was performing a walkthrough when three NDC-102 thickness gauges were discovered. The manager was familiar with the gauges from a different site, but this site did not have any registered, nor does this site have a license for any material. The gauges, potentially only requiring a general license, were moved and the corporate safety group notified in order to secure them. When the safety group arrived, one of the gauges was missing (s/n: 2690; source: 150 mCi of Am-241).
Item Number: NV210004
* * * UPDATE ON 4/23/2021 AT 1720 EDT FROM COREY CREVELING TO THOMAS KENDZIA * * *
The state of Nevada sent a picture of the missing source via email:
The picture confirms the the previous information and the date of the radiological strength was 1/92.
Notified: R4DO (Azua) (email), NMSS Event Notifications (email), and ILTAB (email).
THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL
Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf