Event Notification Report for January 11, 2021
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
01/10/2021 - 01/11/2021
Power Reactor
Event Number: 55130
Facility: Sequoyah
Region: 2 State: TN
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Ryan Radel
HQ OPS Officer: Brian Lin
Region: 2 State: TN
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Ryan Radel
HQ OPS Officer: Brian Lin
Notification Date: 03/09/2021
Notification Time: 11:58 [ET]
Event Date: 01/11/2021
Event Time: 11:52 [EST]
Last Update Date: 03/09/2021
Notification Time: 11:58 [ET]
Event Date: 01/11/2021
Event Time: 11:52 [EST]
Last Update Date: 03/09/2021
Emergency Class: Non Emergency
10 CFR Section:
50.73(a)(1) - Invalid Specif System Actuation
10 CFR Section:
50.73(a)(1) - Invalid Specif System Actuation
Person (Organization):
MILLER, MARK (R2)
MILLER, MARK (R2)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
EN Revision Imported Date: 4/9/2021
EN Revision Text: 60-DAY OPTIONAL TELEPHONIC NOTIFICATION FOR INVALID CONTAINMENT VENTILATION ISOLATION ACTUATION
"This 60-day telephone notification is being submitted in accordance with 10 CFR 50.73(a)(1) and 50.73(a)(2)(iv)(A). The event was an invalid actuation of the Unit 1 Containment Ventilation Isolation (CVI) system.
"On January 11, 2021 at 1152 Eastern Standard Time (EST) with Unit 1 at 100% power, Train 'A' of the CVI System actuated due to an invalid high radiation signal from 1-RM-90-130, Containment Purge Air Exhaust Monitor. The cause of the signal was determined to be a failed sample pump associated with the radiation monitor. 1-RM-90-130 was in service at the time of the invalid signal. The Train 'A' Containment Ventilation Isolation signal was a full actuation of that train and the system functioned as designed.
"Prior to and following the invalid high radiation alarms, all radiation monitors except 1-RM-90-130 were stable at their normal values; therefore, the CVI was invalid. Control room operators performed appropriate checks and confirmed that all required automatic actuations occurred as designed. The failed pump was replaced and returned to service. This event was entered into the corrective action program as CR 1663398.
"The NRC Resident Inspector was notified."
EN Revision Text: 60-DAY OPTIONAL TELEPHONIC NOTIFICATION FOR INVALID CONTAINMENT VENTILATION ISOLATION ACTUATION
"This 60-day telephone notification is being submitted in accordance with 10 CFR 50.73(a)(1) and 50.73(a)(2)(iv)(A). The event was an invalid actuation of the Unit 1 Containment Ventilation Isolation (CVI) system.
"On January 11, 2021 at 1152 Eastern Standard Time (EST) with Unit 1 at 100% power, Train 'A' of the CVI System actuated due to an invalid high radiation signal from 1-RM-90-130, Containment Purge Air Exhaust Monitor. The cause of the signal was determined to be a failed sample pump associated with the radiation monitor. 1-RM-90-130 was in service at the time of the invalid signal. The Train 'A' Containment Ventilation Isolation signal was a full actuation of that train and the system functioned as designed.
"Prior to and following the invalid high radiation alarms, all radiation monitors except 1-RM-90-130 were stable at their normal values; therefore, the CVI was invalid. Control room operators performed appropriate checks and confirmed that all required automatic actuations occurred as designed. The failed pump was replaced and returned to service. This event was entered into the corrective action program as CR 1663398.
"The NRC Resident Inspector was notified."
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Agreement State
Event Number: 55062
Rep Org: NE DIV OF RADIOACTIVE MATERIALS
Licensee: Church of Jesus Christ Latter Day Saints
Region: 4
City: Omaha State: NE
County:
License #: GL448
Agreement: Y
Docket:
NRC Notified By: Deb Wilson
HQ OPS Officer: Thomas Kendzia
Licensee: Church of Jesus Christ Latter Day Saints
Region: 4
City: Omaha State: NE
County:
License #: GL448
Agreement: Y
Docket:
NRC Notified By: Deb Wilson
HQ OPS Officer: Thomas Kendzia
Notification Date: 01/12/2021
Notification Time: 10:00 [ET]
Event Date: 01/11/2021
Event Time: 00:00 [CST]
Last Update Date: 01/13/2021
Notification Time: 10:00 [ET]
Event Date: 01/11/2021
Event Time: 00:00 [CST]
Last Update Date: 01/13/2021
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
NEIL O'KEEFE (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
ILTAB (EMAIL)
NEIL O'KEEFE (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
ILTAB (EMAIL)
EN Revision Imported Date: 1/14/2021
EN Revision Text: AGREEMENT STATE REPORT - TWO MISSING TRITIUM EXIT SIGNS
The following is a summary of a telephone notification from the Nebraska Division of Radioactive Materials (the Department):
The Department was notified by the Church of Jesus Christ Latter Day Saints (church) that they were replacing their Tritium exit signs with LED signs. When the Department compared the inventory lists they identified that two signs were missing from the list. The church is investigating, with the signs identified as missing at this time. The documentation indicates the two missing signs are Isolite brand with serial numbers A391989 and A391995. The original curie content was 11.5 curies of tritium each.
The Department will update this report when they receive more information.
* * * RETRACTION ON 1/13/2021 AT 1652 EST FROM DEB WILSON TO OSSY FONT * * *
The following retraction was received via telephone from the Department:
The two missing tritium exit signs were found.
Notified R4DO (O'Keefe) and NMSS Events Notification and ILTAB via 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 - TWO MISSING TRITIUM EXIT SIGNS
The following is a summary of a telephone notification from the Nebraska Division of Radioactive Materials (the Department):
The Department was notified by the Church of Jesus Christ Latter Day Saints (church) that they were replacing their Tritium exit signs with LED signs. When the Department compared the inventory lists they identified that two signs were missing from the list. The church is investigating, with the signs identified as missing at this time. The documentation indicates the two missing signs are Isolite brand with serial numbers A391989 and A391995. The original curie content was 11.5 curies of tritium each.
The Department will update this report when they receive more information.
* * * RETRACTION ON 1/13/2021 AT 1652 EST FROM DEB WILSON TO OSSY FONT * * *
The following retraction was received via telephone from the Department:
The two missing tritium exit signs were found.
Notified R4DO (O'Keefe) and NMSS Events Notification and ILTAB via 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