| U.S. Nuclear Regulatory Commission
Operations Center Event Reports For
06/10/2013 - 06/11/2013 ** EVENT NUMBERS ** |
 | !!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!! | | Power Reactor | Event Number: 49050 | Facility: FORT CALHOUN
Region: 4 State: NE
Unit: [1] [ ] [ ]
RX Type: (1) CE
NRC Notified By: LUKE JENSEN
HQ OPS Officer: HOWIE CROUCH | Notification Date: 05/17/2013
Notification Time: 17:28 [ET]
Event Date: 05/17/2013
Event Time: [CDT]
Last Update Date: 06/10/2013 | Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
| Person (Organization):
WAYNE WALKER (R4DO)
|
| Unit | SCRAM Code | RX CRIT | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode | | 1 | N | N | 0 | Defueled | 0 | Defueled | Event Text EMBEDMENT DEPTH FOR SEISMIC ANCHORS INADEQUATE
"It has been determined that some instrument racks in the Containment and Auxiliary buildings do not meet their design basis capacity due to inadequate embedment depth of the seismic anchors. Assumptions made about embedment depth for a previous event were determined to be incorrect; therefore, the design basis capacity cannot be assured. This report is being made under 10 CFR 50.72(b)(3)(ii)(B), 'Unanalyzed condition'."
The licensee has notified the NRC Resident Inspector.
* * * RETRACTION ON 6/10/2013 AT 1630 EDT FROM DAVID ORTIZ TO MARK ABRAMOVITZ * * *
"Additional evaluation has determined that the instrument racks are adequately anchored. Therefore, this event is not reportable."
The licensee notified the NRC Resident Inspector.
Notified the R4DO (Gepford). |
| Power Reactor | Event Number: 49103 | Facility: CALLAWAY
Region: 4 State: MO
Unit: [1] [ ] [ ]
RX Type: [1] W-4-LP
NRC Notified By: STEVE PETZEL
HQ OPS Officer: DONALD NORWOOD | Notification Date: 06/10/2013
Notification Time: 17:06 [ET]
Event Date: 04/11/2013
Event Time: 01:28 [CDT]
Last Update Date: 06/10/2013 | Emergency Class: NON EMERGENCY
10 CFR Section:
50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION
| Person (Organization):
HEATHER GEPFORD (R4DO)
|
| Unit | SCRAM Code | RX CRIT | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode | | 1 | N | N | 0 | Cold Shutdown | 0 | Cold Shutdown | Event Text 60-DAY OPTIONAL TELEPHONE NOTIFICATION FOR AN INVALID SPECIFIED SYSTEM ACTUATION
"This 60-day telephone notification is being made per the reporting requirements specified in 10CFR50.73(a)(2)(iv)(A) and 10CFR50.73(a)(1) to describe an invalid actuation signal affecting the emergency feedwater system.
"While the plant was in Mode 5 on 4/11/2013, during performance of a maintenance procedure for AMSAC system logic verification, an invalid MDAFAS occurred. (Note: AMSAC is ATWAS Mitigation System Actuation Circuitry and MDAFAS is Motor Driven Auxiliary Feedwater Actuation Signal). Both trains of the Motor Driven Auxiliary Feedwater Pumps (MDAFPs) started. While generation of the actuation signal is an expected result of the procedure, the actuation occurred several steps earlier in the procedure than expected. Additionally, the Control Room Operators were not expecting the MDAFPs to start. The pumps were manually stopped.
"The actuation was caused by procedural guidance not containing a sufficiently prescribed sequence of activities that should occur when simulating plant conditions leading to the intended actuation of the AMSAC system. The plant was not in a condition where feedwater was required.
"The Senior NRC Resident Inspector was notified." | |