Event Notification Report for October 12, 2006
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/11/2006 - 10/12/2006
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 42902
Facility: FT CALHOUN
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: MARK ABRAMOVITZ
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 10/12/2006
Notification Time: 19:26 [ET]
Event Date: 10/12/2006
Event Time: 17:30 [CDT]
Last Update Date: 11/07/2006
Notification Time: 19:26 [ET]
Event Date: 10/12/2006
Event Time: 17:30 [CDT]
Last Update Date: 11/07/2006
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):
JACK WHITTEN (R4)
JACK WHITTEN (R4)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Refueling | 0 | Refueling |
STEAM GENERATOR INSTRUMENTATION NONCONFORMANCE
"During a review of two nonconformances documented in the station's corrective action system, an unanalyzed condition which could significantly degrade plant safety was noted. The steam generator level instrumentation was not installed as documented in the UFSAR. Letdown valves and piping inside containment was not installed as described in the UFSAR. An unacceptable scenario is a postulated design basis accident in one of the steam generators and a single failure of the letdown piping in the vicinity of the instrumentation piping of the other steam generator, which could, produce conditions that would mislead the operator as to the condition of the plant during the accident."
This condition was discovered during steam generator replacement when the old steam generators were removed and the instrumentation piping became visible. The replacement piping will be routed in accordance with approved drawings. This piping is not required in the current mode.
The licensee notified the NRC Resident Inspector.
* * * RETRACTION ON 11/07/06 AT 1152 EST FROM ERICK MATZKE TO MACKINNON * * *
"Additional review of the situation previously reported has determined that there are no unanalyzed interactions between the SG level instrumentation tubing and the letdown system. The review determined that the previous determination was incorrectly postulating the occurrence of simultaneous accidents. This observation was not readily apparent during the initial review. Therefore this event is not reportable under 10CFR50.72. Event number 42902 is being withdrawn.
"However, the continuing review has identified a failure which will require reporting under part 50.73, but not 50.72."
R4DO (Jeffrey Clark) notified.
The NRC Resident Inspector was notified of the retraction of this event by the licensee.
"During a review of two nonconformances documented in the station's corrective action system, an unanalyzed condition which could significantly degrade plant safety was noted. The steam generator level instrumentation was not installed as documented in the UFSAR. Letdown valves and piping inside containment was not installed as described in the UFSAR. An unacceptable scenario is a postulated design basis accident in one of the steam generators and a single failure of the letdown piping in the vicinity of the instrumentation piping of the other steam generator, which could, produce conditions that would mislead the operator as to the condition of the plant during the accident."
This condition was discovered during steam generator replacement when the old steam generators were removed and the instrumentation piping became visible. The replacement piping will be routed in accordance with approved drawings. This piping is not required in the current mode.
The licensee notified the NRC Resident Inspector.
* * * RETRACTION ON 11/07/06 AT 1152 EST FROM ERICK MATZKE TO MACKINNON * * *
"Additional review of the situation previously reported has determined that there are no unanalyzed interactions between the SG level instrumentation tubing and the letdown system. The review determined that the previous determination was incorrectly postulating the occurrence of simultaneous accidents. This observation was not readily apparent during the initial review. Therefore this event is not reportable under 10CFR50.72. Event number 42902 is being withdrawn.
"However, the continuing review has identified a failure which will require reporting under part 50.73, but not 50.72."
R4DO (Jeffrey Clark) notified.
The NRC Resident Inspector was notified of the retraction of this event by the licensee.
General Information or Other
Event Number: 42903
Rep Org: SC DIV OF HEALTH & ENV CONTROL
Licensee: CAROLINA TECHNICAL SERVICES, INC
Region: 1
City: NEWBERRY State: SC
County:
License #: 558
Agreement: Y
Docket:
NRC Notified By: MARK WINDHAM
HQ OPS Officer: BILL GOTT
Licensee: CAROLINA TECHNICAL SERVICES, INC
Region: 1
City: NEWBERRY State: SC
County:
License #: 558
Agreement: Y
Docket:
NRC Notified By: MARK WINDHAM
HQ OPS Officer: BILL GOTT
Notification Date: 10/13/2006
Notification Time: 10:34 [ET]
Event Date: 10/12/2006
Event Time: 15:40 [EDT]
Last Update Date: 10/13/2006
Notification Time: 10:34 [ET]
Event Date: 10/12/2006
Event Time: 15:40 [EDT]
Last Update Date: 10/13/2006
Emergency Class: NON EMERGENCY
10 CFR Section:
10 CFR Section:
Person (Organization):
CHRISTOPHER CAHILL (R1)
SANDRA WASTLER (NMSS)
CHRISTOPHER CAHILL (R1)
SANDRA WASTLER (NMSS)
AGREEMENT STATE REPORT - DAMAGED MOISTURE DENSITY GAUGE
The State provided the following information via facsimile:
"The SC Department of Health and Environmental Control was notified on Thursday, October 12, 2006, at 3:45 p.m., that a CPN Model MC-1-DRP had been damaged at 3:40 p.m., on October 12, 2006. The RSO stated that the gauge had been run over by a dump truck during a soil compaction test. The SC Department of Health and Environmental Control Duty Officer responded to the scene and arrived at 5:15 p.m. and found the area properly roped off. The source rod was extended and the gauge had sustained considerable damage. The inspector and licensee personnel were able to retract the source rod to the shielded position and place the gauge in the transport container. The inspector advised the RSO to return the gauge to the storage location, secure it from further use, and to contact the gauge manufacturer for further instruction regarding disposal."
A typical CPN Model MC-1-DRP moisture density gauge contains 10 millicuries Cs-137 and 50 millicuries Am-241/Be.
The State provided the following information via facsimile:
"The SC Department of Health and Environmental Control was notified on Thursday, October 12, 2006, at 3:45 p.m., that a CPN Model MC-1-DRP had been damaged at 3:40 p.m., on October 12, 2006. The RSO stated that the gauge had been run over by a dump truck during a soil compaction test. The SC Department of Health and Environmental Control Duty Officer responded to the scene and arrived at 5:15 p.m. and found the area properly roped off. The source rod was extended and the gauge had sustained considerable damage. The inspector and licensee personnel were able to retract the source rod to the shielded position and place the gauge in the transport container. The inspector advised the RSO to return the gauge to the storage location, secure it from further use, and to contact the gauge manufacturer for further instruction regarding disposal."
A typical CPN Model MC-1-DRP moisture density gauge contains 10 millicuries Cs-137 and 50 millicuries Am-241/Be.