Event Notification Report for September 01, 2013
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
08/31/2013 - 09/01/2013
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Non-Agreement State
Event Number: 49315
Rep Org: ACUREN INSPECTION INC
Licensee: ACUREN INSPECTION INC
Region: 4
City: LA PORTE State: TX
County:
License #: 42-27593-01
Agreement: Y
Docket:
NRC Notified By: GAYLE STATON
HQ OPS Officer: CHARLES TEAL
Licensee: ACUREN INSPECTION INC
Region: 4
City: LA PORTE State: TX
County:
License #: 42-27593-01
Agreement: Y
Docket:
NRC Notified By: GAYLE STATON
HQ OPS Officer: CHARLES TEAL
Notification Date: 09/01/2013
Notification Time: 17:55 [ET]
Event Date: 09/01/2013
Event Time: 15:00 [CDT]
Last Update Date: 09/04/2013
Notification Time: 17:55 [ET]
Event Date: 09/01/2013
Event Time: 15:00 [CDT]
Last Update Date: 09/04/2013
Emergency Class: NON EMERGENCY
10 CFR Section:
20.2202(b)(1) - PERS OVEREXPOSURE/TEDE >= 5 REM
10 CFR Section:
20.2202(b)(1) - PERS OVEREXPOSURE/TEDE >= 5 REM
Person (Organization):
BOB HAGAR (R4DO)
FSME EVENT RESOURCE (EMAI)
BOB HAGAR (R4DO)
FSME EVENT RESOURCE (EMAI)
POTENTIAL OVEREXPOSURE OF RADIOGRAPHER
The RSO for the licensee called to report a potential overexposure of a radiographer. This event occurred while the radiographer was checking welds at a refinery in Wyoming. While moving the camera to another location, the radiographer's dosimeter alarmed. It is suspected that the camera's source was not fully retracted into the safe position. The source was subsequently retracted back into the fully shielded position.
The RSO calculates an estimated dose to the radiographer of 5 rem. The licensee will send the radiographer's dosimetry for expedited reading as soon as possible.
The licensee will update this report with additional details as they become available.
* * * RETRACTION FROM GAYLE STATON TO HUFFMAN AT 1436 EDT ON 9/04/13 * * *
The RSO has received the radiographer's dosimetry badge readings. The radiographer was still wearing his August dosimetry when the event occurred. His badge readings was 328 mrem for the entire month of August including the exposure from this event.
Since there was no significant exposure from the event, the licensee has retracted this event notification.
The licensee has notified NRC (Thompson) in Region 4. R4DO (Gaddy) notified and a copy of this report was sent to FSME Event Resource.
The RSO for the licensee called to report a potential overexposure of a radiographer. This event occurred while the radiographer was checking welds at a refinery in Wyoming. While moving the camera to another location, the radiographer's dosimeter alarmed. It is suspected that the camera's source was not fully retracted into the safe position. The source was subsequently retracted back into the fully shielded position.
The RSO calculates an estimated dose to the radiographer of 5 rem. The licensee will send the radiographer's dosimetry for expedited reading as soon as possible.
The licensee will update this report with additional details as they become available.
* * * RETRACTION FROM GAYLE STATON TO HUFFMAN AT 1436 EDT ON 9/04/13 * * *
The RSO has received the radiographer's dosimetry badge readings. The radiographer was still wearing his August dosimetry when the event occurred. His badge readings was 328 mrem for the entire month of August including the exposure from this event.
Since there was no significant exposure from the event, the licensee has retracted this event notification.
The licensee has notified NRC (Thompson) in Region 4. R4DO (Gaddy) notified and a copy of this report was sent to FSME Event Resource.
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 49316
Facility: MONTICELLO
Region: 3 State: MN
Unit: [1] [] []
RX Type: [1] GE-3
NRC Notified By: ANGLE BRAY
HQ OPS Officer: DONG HWA PARK
Region: 3 State: MN
Unit: [1] [] []
RX Type: [1] GE-3
NRC Notified By: ANGLE BRAY
HQ OPS Officer: DONG HWA PARK
Notification Date: 09/01/2013
Notification Time: 23:34 [ET]
Event Date: 09/01/2013
Event Time: 16:10 [CDT]
Last Update Date: 10/13/2013
Notification Time: 23:34 [ET]
Event Date: 09/01/2013
Event Time: 16:10 [CDT]
Last Update Date: 10/13/2013
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
RICHARD SKOKOWSKI (R3DO)
RICHARD SKOKOWSKI (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 98 | Power Operation |
RECIRC PUMP RUNBACK AND POWER REDUCTION
"On September 1, 2013 at 1610 CST, Monticello Nuclear Generating Plant (MNGP) experienced a runback of 'A' Recirc pump from 87% speed to 82% speed. Operators took action to lock 'A' Recirc pump scoop tube. This runback resulted in a power reduction from 100% to 98% RTP [Rated Thermal Power]. Should a LOCA [Loss of Coolant Accident] occur with the resultant mismatch between total jet pump flows of the two loops greater than required limits, the core flow coastdown and resultant core response may not be bounded by the LOCA analyses. It has been determined that this is an unanalyzed condition as defined by 10CFR50.72(b)(3)(ii)(B).
"At 2123 CST on September 1, 2013, MNGP completed adjusting recirc flow speed on 'A' and 'B' Recirc pumps to match jet pump loop flows to within the required limits and is no longer in an unanalyzed condition. Both 'A' and 'B' Recirc scoop tubes remain locked pending investigation."
The licensee has notified the NRC Resident Inspector.
* * * RETRACTION ON 10/11/13 AT 1253 EDT FROM MARK HOESCHEN TO DONG PARK * * *
"This is a retraction for ENS 49316: The licensee reviewed the MNGP design basis analysis to determine if the event was bounded. The licensee determined that the Loss of Coolant Accident (LOCA) provides a bounding analysis for this event.
"The limiting LOCA event for the MNGP as analyzed in accordance with 10CFR50 Appendix K conditions is based upon single failure of the Low Pressure Coolant Injection (LPCI) injection valve, effectively making LPCI inoperable for the event. The large break Design Basis Accident (DBA) with LPCI injection valve failure (which is analytically equivalent to the condition of both LPCI subsystems being inoperable) is the event analyzed for the current Licensing Basis Peak Cladding Temperature (PCT). This analysis bounds the event as a recirculation pump flow mismatch event is less limiting than the LOCA with LPCI injection valve failure analysis.
"Therefore, this recirculating loop flow mismatched event is less limiting than a previously analyzed event and ENS 49316 may be retracted as an unanalyzed event."
The licensee has notified the NRC Resident Inspector. Notified R3DO (Skokowski).
"On September 1, 2013 at 1610 CST, Monticello Nuclear Generating Plant (MNGP) experienced a runback of 'A' Recirc pump from 87% speed to 82% speed. Operators took action to lock 'A' Recirc pump scoop tube. This runback resulted in a power reduction from 100% to 98% RTP [Rated Thermal Power]. Should a LOCA [Loss of Coolant Accident] occur with the resultant mismatch between total jet pump flows of the two loops greater than required limits, the core flow coastdown and resultant core response may not be bounded by the LOCA analyses. It has been determined that this is an unanalyzed condition as defined by 10CFR50.72(b)(3)(ii)(B).
"At 2123 CST on September 1, 2013, MNGP completed adjusting recirc flow speed on 'A' and 'B' Recirc pumps to match jet pump loop flows to within the required limits and is no longer in an unanalyzed condition. Both 'A' and 'B' Recirc scoop tubes remain locked pending investigation."
The licensee has notified the NRC Resident Inspector.
* * * RETRACTION ON 10/11/13 AT 1253 EDT FROM MARK HOESCHEN TO DONG PARK * * *
"This is a retraction for ENS 49316: The licensee reviewed the MNGP design basis analysis to determine if the event was bounded. The licensee determined that the Loss of Coolant Accident (LOCA) provides a bounding analysis for this event.
"The limiting LOCA event for the MNGP as analyzed in accordance with 10CFR50 Appendix K conditions is based upon single failure of the Low Pressure Coolant Injection (LPCI) injection valve, effectively making LPCI inoperable for the event. The large break Design Basis Accident (DBA) with LPCI injection valve failure (which is analytically equivalent to the condition of both LPCI subsystems being inoperable) is the event analyzed for the current Licensing Basis Peak Cladding Temperature (PCT). This analysis bounds the event as a recirculation pump flow mismatch event is less limiting than the LOCA with LPCI injection valve failure analysis.
"Therefore, this recirculating loop flow mismatched event is less limiting than a previously analyzed event and ENS 49316 may be retracted as an unanalyzed event."
The licensee has notified the NRC Resident Inspector. Notified R3DO (Skokowski).