Event Notification Report for October 28, 2013
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/27/2013 - 10/28/2013
Power Reactor
Event Number: 49478
Facility: FORT CALHOUN
Region: 4 State: NE
Unit: [1] [] []
RX Type: (1) CE
NRC Notified By: DAVID ORTIZ
HQ OPS Officer: JOHN SHOEMAKER
Region: 4 State: NE
Unit: [1] [] []
RX Type: (1) CE
NRC Notified By: DAVID ORTIZ
HQ OPS Officer: JOHN SHOEMAKER
Notification Date: 10/28/2013
Notification Time: 18:02 [ET]
Event Date: 10/28/2013
Event Time: 12:30 [CDT]
Last Update Date: 10/28/2013
Notification Time: 18:02 [ET]
Event Date: 10/28/2013
Event Time: 12:30 [CDT]
Last Update Date: 10/28/2013
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):
JAMES DRAKE (R4DO)
JAMES DRAKE (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 |
POSTULATED EVENT COULD RESULT IN A HOT SHORT THAT COULD ADVERSELY IMPACT SAFE SHUTDOWN EQUIPMENT
"A review of industry operating experience regarding the impact of unfused direct current (DC) ammeter circuits in the control room has determined that the condition described below applies to Fort Calhoun Nuclear Station. This could result in an unanalyzed condition with respect to 10 CFR 50 Appendix R analysis requirements.
"The control room ampere indications for the Class 1E batteries and their chargers do not include over-current protection to limit fault current.
"In a postulated event, a fire in the control room could cause one of the ammeter wires to hot-short to the ground plane. Simultaneously, the event could cause another DC wire from the opposite polarity on the same battery to hot-short to the ground plane. This would cause a ground-loop through unprotected ammeter wiring.
"Since this circuit is not protected (not fused), this event could result in excessive current flow in the ammeter wiring to the point of causing a secondary fire in the associated raceway system. This could potentially cause the loss of the ability to conduct a safe shutdown as required by 10CFR50 Appendix R.
"This condition is being reported in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition that significantly degrades plant safety. Compensatory measures (fire watches) have been implemented for affected areas of the plant.
"The NRC Resident Inspector has been notified."
"A review of industry operating experience regarding the impact of unfused direct current (DC) ammeter circuits in the control room has determined that the condition described below applies to Fort Calhoun Nuclear Station. This could result in an unanalyzed condition with respect to 10 CFR 50 Appendix R analysis requirements.
"The control room ampere indications for the Class 1E batteries and their chargers do not include over-current protection to limit fault current.
"In a postulated event, a fire in the control room could cause one of the ammeter wires to hot-short to the ground plane. Simultaneously, the event could cause another DC wire from the opposite polarity on the same battery to hot-short to the ground plane. This would cause a ground-loop through unprotected ammeter wiring.
"Since this circuit is not protected (not fused), this event could result in excessive current flow in the ammeter wiring to the point of causing a secondary fire in the associated raceway system. This could potentially cause the loss of the ability to conduct a safe shutdown as required by 10CFR50 Appendix R.
"This condition is being reported in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition that significantly degrades plant safety. Compensatory measures (fire watches) have been implemented for affected areas of the plant.
"The NRC Resident Inspector has been notified."
Agreement State
Event Number: 49479
Rep Org: CALIFORNIA RADIATION CONTROL PRGM
Licensee: AMEC ENVIRONMENT & INFRASTRUCTURE, INC.
Region: 4
City: IRVINE State: CA
County:
License #: CA5799-30
Agreement: Y
Docket:
NRC Notified By: K. HARKNESS
HQ OPS Officer: PETE SNYDER
Licensee: AMEC ENVIRONMENT & INFRASTRUCTURE, INC.
Region: 4
City: IRVINE State: CA
County:
License #: CA5799-30
Agreement: Y
Docket:
NRC Notified By: K. HARKNESS
HQ OPS Officer: PETE SNYDER
Notification Date: 10/28/2013
Notification Time: 16:03 [ET]
Event Date: 10/28/2013
Event Time: 11:30 [PDT]
Last Update Date: 10/28/2013
Notification Time: 16:03 [ET]
Event Date: 10/28/2013
Event Time: 11:30 [PDT]
Last Update Date: 10/28/2013
Emergency Class: NON EMERGENCY
10 CFR Section:
10 CFR Section:
Person (Organization):
JAMES DRAKE (R4DO)
FSME EVENT RESOURCE (EMAI)
ILTAB (EMAI)
MEXICO (EMAI)
JAMES DRAKE (R4DO)
FSME EVENT RESOURCE (EMAI)
ILTAB (EMAI)
MEXICO (EMAI)
AGREEMENT STATE REPORT - STOLEN MOISTURE DENSITY GAUGE
The State of California submitted the following via email:
"At 1130 [PDT] on October 28, 2013, the RSO for AMEC called to report a stolen moisture density [M/D] gauge: Troxler, model 3440, S/N 36036 that contains 8 millicuries of Cs-137 and 40 millicuries of Am-241/Be.
"The stolen gauge was last seen on Friday, October 25, 2013 by the authorized user, who secured the M/D gauge in safe mode inside the locked yellow transportation box which was placed inside a locked metal box. The contractor's tools at the site in Mission Valley, CA was also burglarized and a police report was filed.
"The [metal] box's lock had been drilled out and the chain attaching it to the building was cut. RHB [Radiation Health Branch] advised the RSO to place a Lost/Found notice in the local paper offering a reward for return of the gauge to AMEC."
CA 5010 Number: 102813
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
The State of California submitted the following via email:
"At 1130 [PDT] on October 28, 2013, the RSO for AMEC called to report a stolen moisture density [M/D] gauge: Troxler, model 3440, S/N 36036 that contains 8 millicuries of Cs-137 and 40 millicuries of Am-241/Be.
"The stolen gauge was last seen on Friday, October 25, 2013 by the authorized user, who secured the M/D gauge in safe mode inside the locked yellow transportation box which was placed inside a locked metal box. The contractor's tools at the site in Mission Valley, CA was also burglarized and a police report was filed.
"The [metal] box's lock had been drilled out and the chain attaching it to the building was cut. RHB [Radiation Health Branch] advised the RSO to place a Lost/Found notice in the local paper offering a reward for return of the gauge to AMEC."
CA 5010 Number: 102813
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