Event Notification Report for November 01, 2021
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/31/2021 - 11/01/2021
Agreement State
Event Number: 55541
Rep Org: Illinois Emergency Mgmt. Agency
Licensee: Flood Testing Labratories
Region: 3
City: Chicago State: IL
County:
License #: IL-01651-01
Agreement: Y
Docket:
NRC Notified By: Gary Forsee
HQ OPS Officer: Brian Lin
Licensee: Flood Testing Labratories
Region: 3
City: Chicago State: IL
County:
License #: IL-01651-01
Agreement: Y
Docket:
NRC Notified By: Gary Forsee
HQ OPS Officer: Brian Lin
Notification Date: 10/22/2021
Notification Time: 22:25 [ET]
Event Date: 10/22/2021
Event Time: 15:00 [CDT]
Last Update Date: 10/22/2021
Notification Time: 22:25 [ET]
Event Date: 10/22/2021
Event Time: 15:00 [CDT]
Last Update Date: 10/22/2021
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Szwarc, Dariusz (R3)
NMSS_EVENTS_NOTIFICATION, (EMAIL)
Szwarc, Dariusz (R3)
NMSS_EVENTS_NOTIFICATION, (EMAIL)
EN Revision Imported Date: 11/1/2021
EN Revision Text: AGREEMENT STATE REPORT - DAMAGED MOISTURE DENSITY GAUGE
The following information was received from the state of Illinois via email:
"The Illinois Emergency Management Agency operations center was contacted at 1904 CDT on 10/22/21 by the Radiation Safety Officer (RSO) for Flood Testing Laboratories (RML IL-01651-01) to advise that at approximately 1500 CDT that afternoon, a Troxler 3430 moisture density gauge [(40 milliCurie Am-241/Be and 8 milliCurie Cs-137 source)] was struck by a bulldozer on a construction site. The operator was uninjured and reportedly promptly notified the RSO. The area was secured and the RSO responded to the scene to package and secure the damaged gauge. The source rod was not extended when struck (glancing blow with blade) and both the source rod and the americium source housing were undamaged. The gauge was able to be repackaged in the transport container and is currently in safe storage in the licensee's facility in Chicago. The licensee does not own a radiation survey meter. Leak tests have been collected and the manufacturer contacted for expedited processing. Agency inspectors will investigate further next week to determine the adequacy of emergency procedures, results of leak tests, and the proximity/awareness of the operator during the incident.
"This matter is reportable under 32 Ill. Adm. Code 340.1220(c)(2) and was reported to the NRC Operations Center the same day under NMED event number IL210033."
EN Revision Text: AGREEMENT STATE REPORT - DAMAGED MOISTURE DENSITY GAUGE
The following information was received from the state of Illinois via email:
"The Illinois Emergency Management Agency operations center was contacted at 1904 CDT on 10/22/21 by the Radiation Safety Officer (RSO) for Flood Testing Laboratories (RML IL-01651-01) to advise that at approximately 1500 CDT that afternoon, a Troxler 3430 moisture density gauge [(40 milliCurie Am-241/Be and 8 milliCurie Cs-137 source)] was struck by a bulldozer on a construction site. The operator was uninjured and reportedly promptly notified the RSO. The area was secured and the RSO responded to the scene to package and secure the damaged gauge. The source rod was not extended when struck (glancing blow with blade) and both the source rod and the americium source housing were undamaged. The gauge was able to be repackaged in the transport container and is currently in safe storage in the licensee's facility in Chicago. The licensee does not own a radiation survey meter. Leak tests have been collected and the manufacturer contacted for expedited processing. Agency inspectors will investigate further next week to determine the adequacy of emergency procedures, results of leak tests, and the proximity/awareness of the operator during the incident.
"This matter is reportable under 32 Ill. Adm. Code 340.1220(c)(2) and was reported to the NRC Operations Center the same day under NMED event number IL210033."
Agreement State
Event Number: 55542
Rep Org: Ohio Bureau of Radiation Protection
Licensee: University of Cincinnati Medical Center
Region: 3
City: Cincinnati State: OH
County:
License #: 02110310001
Agreement: Y
Docket:
NRC Notified By: Michael Rubadue
HQ OPS Officer: Brian P. Smith
Licensee: University of Cincinnati Medical Center
Region: 3
City: Cincinnati State: OH
County:
License #: 02110310001
Agreement: Y
Docket:
NRC Notified By: Michael Rubadue
HQ OPS Officer: Brian P. Smith
Notification Date: 10/25/2021
Notification Time: 15:40 [ET]
Event Date: 10/22/2021
Event Time: 12:00 [EDT]
Last Update Date: 10/25/2021
Notification Time: 15:40 [ET]
Event Date: 10/22/2021
Event Time: 12:00 [EDT]
Last Update Date: 10/25/2021
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Orlikowski, Robert (R3)
NMSS_Events_Notification, (EMAIL)
Orlikowski, Robert (R3)
NMSS_Events_Notification, (EMAIL)
EN Revision Imported Date: 11/2/2021
EN Revision Text: AGREEMENT STATE - EQUIPMENT FAILURE
The following report was received by the Ohio Bureau of Radiation Protection via email:
"The licensee reported a Varian Varisource 200 HDR unit failed to indicate the source was fully retracted at the conclusion of patient treatment. The licensee initiated emergency procedures and entered the room. Surveys confirmed the source had fully retracted into the unit and the patient did not receive any additional dose beyond what was prescribed. The unit console has been locked and placed out of service until the manufacturer can inspect and repair the device."
Ohio Report Number: OH210008
A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.
EN Revision Text: AGREEMENT STATE - EQUIPMENT FAILURE
The following report was received by the Ohio Bureau of Radiation Protection via email:
"The licensee reported a Varian Varisource 200 HDR unit failed to indicate the source was fully retracted at the conclusion of patient treatment. The licensee initiated emergency procedures and entered the room. Surveys confirmed the source had fully retracted into the unit and the patient did not receive any additional dose beyond what was prescribed. The unit console has been locked and placed out of service until the manufacturer can inspect and repair the device."
Ohio Report Number: OH210008
A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.
Agreement State
Event Number: 55543
Rep Org: NJ Dept of Environmental Protection
Licensee: SOFIE
Region: 1
City: Totowa State: NJ
County:
License #: 832599-RAD-210001
Agreement: Y
Docket:
NRC Notified By: Nancy Stanley
HQ OPS Officer: Brian P. Smith
Licensee: SOFIE
Region: 1
City: Totowa State: NJ
County:
License #: 832599-RAD-210001
Agreement: Y
Docket:
NRC Notified By: Nancy Stanley
HQ OPS Officer: Brian P. Smith
Notification Date: 10/25/2021
Notification Time: 16:36 [ET]
Event Date: 10/25/2021
Event Time: 10:45 [EDT]
Last Update Date: 10/25/2021
Notification Time: 16:36 [ET]
Event Date: 10/25/2021
Event Time: 10:45 [EDT]
Last Update Date: 10/25/2021
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Ferdas, Marc (R1)
NMSS_Events_Notification, (EMAIL)
Ferdas, Marc (R1)
NMSS_Events_Notification, (EMAIL)
EN Revision Imported Date: 11/2/2021
EN Revision Text: AGREEMENT STATE - CONTAMINATED PACKAGE
The following information was received from the New Jersey Department of Environmental Protection via email:
"At 1030 EDT on October 25, 2021, a package containing Zr-89 was received from the common carrier (airway bill number 770242368189) at the licensee's facility in New Jersey. At 1045 EDT, the package was wipe tested by a licensee employee and results indicated a high level of removable contamination. The bottom of the box read 217,410 counts per minute (cpm), while the background read 1,510 cpm. The box was opened and the top of the lead pig which holds the vial of liquid (approximately 200 microliters) radioactive Zr-89, which was 2,139 MBq at time of packaging on October 22, 2021, was found to be detached from the bottom of the lead pig. Pieces of the vial were observed to be outside of the lead pig which indicates the vial was indeed broken. The box was re-sealed and placed into the cyclotron vault at the licensee's facility for safety and containment purposes. At 1100 EDT, the Zr-89 manufacturer and shipper were notified of the situation. The box has been secured and contained within the cyclotron vault, 50 feet away from personnel at the facility."
EN Revision Text: AGREEMENT STATE - CONTAMINATED PACKAGE
The following information was received from the New Jersey Department of Environmental Protection via email:
"At 1030 EDT on October 25, 2021, a package containing Zr-89 was received from the common carrier (airway bill number 770242368189) at the licensee's facility in New Jersey. At 1045 EDT, the package was wipe tested by a licensee employee and results indicated a high level of removable contamination. The bottom of the box read 217,410 counts per minute (cpm), while the background read 1,510 cpm. The box was opened and the top of the lead pig which holds the vial of liquid (approximately 200 microliters) radioactive Zr-89, which was 2,139 MBq at time of packaging on October 22, 2021, was found to be detached from the bottom of the lead pig. Pieces of the vial were observed to be outside of the lead pig which indicates the vial was indeed broken. The box was re-sealed and placed into the cyclotron vault at the licensee's facility for safety and containment purposes. At 1100 EDT, the Zr-89 manufacturer and shipper were notified of the situation. The box has been secured and contained within the cyclotron vault, 50 feet away from personnel at the facility."
Power Reactor
Event Number: 55550
Facility: Watts Bar
Region: 2 State: TN
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Rob Collins
HQ OPS Officer: Donald Norwood
Region: 2 State: TN
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Rob Collins
HQ OPS Officer: Donald Norwood
Notification Date: 10/28/2021
Notification Time: 14:19 [ET]
Event Date: 10/28/2021
Event Time: 13:40 [EDT]
Last Update Date: 10/28/2021
Notification Time: 14:19 [ET]
Event Date: 10/28/2021
Event Time: 13:40 [EDT]
Last Update Date: 10/28/2021
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(xi) - Offsite Notification
10 CFR Section:
50.72(b)(2)(xi) - Offsite Notification
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 | 92 | Power Operation | 92 | Power Operation |
| 2 | N | Y | 95 | Power Operation | 95 | Power Operation |
EN Revision Imported Date: 11/1/2021
EN Revision Text: OFFSITE NOTIFICATION DUE TO TWO MONITORING WELLS EXCEEDING NEI GPI TRITIUM THRESHOLD VALUES
"At 1340 EDT on October 28, 2021, Watts Bar Nuclear Plant (WBN) Units 1 and 2 initiated voluntary communication to the State of Tennessee and local officials as part of the Nuclear Energy Institute (NEI) Groundwater Protection Initiative (GPI), after receiving analysis results for two on-site monitoring wells that indicated tritium activity above the GPI voluntary communication threshold. The suspected source, a permitted release line, has been isolated, and additional corrective actions are in progress. This condition did not exceed any NRC regulations or reporting criteria. This notification is being made solely as a four-hour, non-emergency notification for a Notification of Other Government Agency. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
EN Revision Text: OFFSITE NOTIFICATION DUE TO TWO MONITORING WELLS EXCEEDING NEI GPI TRITIUM THRESHOLD VALUES
"At 1340 EDT on October 28, 2021, Watts Bar Nuclear Plant (WBN) Units 1 and 2 initiated voluntary communication to the State of Tennessee and local officials as part of the Nuclear Energy Institute (NEI) Groundwater Protection Initiative (GPI), after receiving analysis results for two on-site monitoring wells that indicated tritium activity above the GPI voluntary communication threshold. The suspected source, a permitted release line, has been isolated, and additional corrective actions are in progress. This condition did not exceed any NRC regulations or reporting criteria. This notification is being made solely as a four-hour, non-emergency notification for a Notification of Other Government Agency. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
Part 21
Event Number: 55551
Rep Org: United Controls International
Licensee:
Region: 2
City: Norcross State: GA
County:
License #:
Agreement: Y
Docket:
NRC Notified By: Rob Hale
HQ OPS Officer: Donald Norwood
Licensee:
Region: 2
City: Norcross State: GA
County:
License #:
Agreement: Y
Docket:
NRC Notified By: Rob Hale
HQ OPS Officer: Donald Norwood
Notification Date: 10/28/2021
Notification Time: 17:14 [ET]
Event Date: 06/18/2021
Event Time: 00:00 [EDT]
Last Update Date: 10/28/2021
Notification Time: 17:14 [ET]
Event Date: 06/18/2021
Event Time: 00:00 [EDT]
Last Update Date: 10/28/2021
Emergency Class: Non Emergency
10 CFR Section:
21.21(d)(3)(i) - Defects And Noncompliance
10 CFR Section:
21.21(d)(3)(i) - Defects And Noncompliance
Person (Organization):
Miller, Mark (R2DO)
Pick, Greg (R4DO)
Part 21/50.55 Reactors, - (EMAIL)
Miller, Mark (R2DO)
Pick, Greg (R4DO)
Part 21/50.55 Reactors, - (EMAIL)
EN Revision Imported Date: 11/1/2021
EN Revision Text: PART 21 REPORT - FAILURE OF A BASLER ELECTRIC TRANSFORMER IN A YORK TEMPERATURE CONTROL MODULE
The following is a synopsis of information received via facsimile:
On June 18, 2021, STP Nuclear Operating Company returned a York TCM-1A temperature control module with the reported issue that the module would not respond in auto or manual vane control and that internal relays 1R and 2R would not pick up. The subject temperature control module was previously returned by STP Nuclear Operating Company to United Controls International (UCI) for refurbishment and modification, after which it was returned by UCI to STP Nuclear Operating Company on March 13, 2017.
Troubleshooting performed by UCI identified that the secondary of the Basler Electric BE13410001 transformer that is used to isolate and step down the input voltage from 115V AC to 22V AC had an open circuit. When the subject transformer was bypassed, the module operated as designed. UCI is unable to determine the cause of the transformer failure. Post refurbishment/modification testing performed by UCI included verifying functionality of the unit before and after performance of a 48 hr. burn-in period.
The only facility that is listed as being affected is STP Nuclear Operating Company.
If you have any questions or wish to discuss this matter or this report, please contact: Wesley Hickle, Engineering Manager, whickle@unitedcontrols.com, 470-610-0870.
EN Revision Text: PART 21 REPORT - FAILURE OF A BASLER ELECTRIC TRANSFORMER IN A YORK TEMPERATURE CONTROL MODULE
The following is a synopsis of information received via facsimile:
On June 18, 2021, STP Nuclear Operating Company returned a York TCM-1A temperature control module with the reported issue that the module would not respond in auto or manual vane control and that internal relays 1R and 2R would not pick up. The subject temperature control module was previously returned by STP Nuclear Operating Company to United Controls International (UCI) for refurbishment and modification, after which it was returned by UCI to STP Nuclear Operating Company on March 13, 2017.
Troubleshooting performed by UCI identified that the secondary of the Basler Electric BE13410001 transformer that is used to isolate and step down the input voltage from 115V AC to 22V AC had an open circuit. When the subject transformer was bypassed, the module operated as designed. UCI is unable to determine the cause of the transformer failure. Post refurbishment/modification testing performed by UCI included verifying functionality of the unit before and after performance of a 48 hr. burn-in period.
The only facility that is listed as being affected is STP Nuclear Operating Company.
If you have any questions or wish to discuss this matter or this report, please contact: Wesley Hickle, Engineering Manager, whickle@unitedcontrols.com, 470-610-0870.
Power Reactor
Event Number: 55552
Facility: Vogtle
Region: 2 State: GA
Unit: [3] [4] []
RX Type: [3] W-AP1000,[4] W-AP1000
NRC Notified By: Steven Leighty
HQ OPS Officer: Brian Lin
Region: 2 State: GA
Unit: [3] [4] []
RX Type: [3] W-AP1000,[4] W-AP1000
NRC Notified By: Steven Leighty
HQ OPS Officer: Brian Lin
Notification Date: 10/29/2021
Notification Time: 14:25 [ET]
Event Date: 10/29/2021
Event Time: 10:10 [EDT]
Last Update Date: 10/29/2021
Notification Time: 14:25 [ET]
Event Date: 10/29/2021
Event Time: 10:10 [EDT]
Last Update Date: 10/29/2021
Emergency Class: Non Emergency
10 CFR Section:
26.719 - Fitness For Duty
10 CFR Section:
26.719 - Fitness For Duty
Person (Organization):
Miller, Mark (R2)
FFD Group, (EMAIL)
Miller, Mark (R2)
FFD Group, (EMAIL)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 3 | N | N | 0 | Under Construction | 0 | Under Construction |
| 4 | N | N | 0 | Under Construction | 0 | Under Construction |
CONTRACTOR SUPERVISOR FITNESS-FOR-DUTY FAILURE
"At 1010 EDT on October 29, 2021, Southern Nuclear Operating Company (SNC) determined a contractor supervisor attempted to subvert a random Fitness-for-Duty (FFD) test. The employee's badge has been confiscated. The NRC Resident Inspector has been notified."
"At 1010 EDT on October 29, 2021, Southern Nuclear Operating Company (SNC) determined a contractor supervisor attempted to subvert a random Fitness-for-Duty (FFD) test. The employee's badge has been confiscated. The NRC Resident Inspector has been notified."
Agreement State
Event Number: 55544
Rep Org: Arizona Dept of Health Services
Licensee: Honorhealth dba Scottsdale Osborn Medical Center
Region: 4
City: Scottsdale State: AZ
County:
License #: 07-177
Agreement: Y
Docket:
NRC Notified By: Brian D. Goretzki
HQ OPS Officer: Lloyd Desotell
Licensee: Honorhealth dba Scottsdale Osborn Medical Center
Region: 4
City: Scottsdale State: AZ
County:
License #: 07-177
Agreement: Y
Docket:
NRC Notified By: Brian D. Goretzki
HQ OPS Officer: Lloyd Desotell
Notification Date: 10/26/2021
Notification Time: 11:03 [ET]
Event Date: 10/25/2021
Event Time: 00:00 [MST]
Last Update Date: 10/26/2021
Notification Time: 11:03 [ET]
Event Date: 10/25/2021
Event Time: 00:00 [MST]
Last Update Date: 10/26/2021
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Pick, Greg (R4)
NMSS_Events_Notification, (EMAIL)
Pick, Greg (R4)
NMSS_Events_Notification, (EMAIL)
EN Revision Imported Date: 11/2/2021
EN Revision Text: AGREEMENT STATE REPORT - DISLODGED I-125 EYE PLAQUE
The following information was received from the Arizona Department of Health Services (the Department) via email:
"On October 25, 2021, the Department received notification that an I-125 eye plaque became dislodged from a patient's eye and fell to the floor. The eye plaque contained 30 Iso-Aid High Activity Advantage seeds with an activity of 1.33 mCi per seed. The patient placed the eye plaque in a lead pouch and then contacted the Authorized User, who was able to take possession of the seeds. The Ophthalmologist that performed the surgery has been notified. The Department has requested additional information and continues to investigate the event.
"Additional information will be provided as it is received in accordance with SA-300."
Arizona Incident No: 21-007
EN Revision Text: AGREEMENT STATE REPORT - DISLODGED I-125 EYE PLAQUE
The following information was received from the Arizona Department of Health Services (the Department) via email:
"On October 25, 2021, the Department received notification that an I-125 eye plaque became dislodged from a patient's eye and fell to the floor. The eye plaque contained 30 Iso-Aid High Activity Advantage seeds with an activity of 1.33 mCi per seed. The patient placed the eye plaque in a lead pouch and then contacted the Authorized User, who was able to take possession of the seeds. The Ophthalmologist that performed the surgery has been notified. The Department has requested additional information and continues to investigate the event.
"Additional information will be provided as it is received in accordance with SA-300."
Arizona Incident No: 21-007
Agreement State
Event Number: 55545
Rep Org: California Radiation Control Prgm
Licensee: CTE CAL, Inc.
Region: 4
City: Fremont State: CA
County:
License #: 8327-01
Agreement: Y
Docket:
NRC Notified By: Arunika Hewadikaram
HQ OPS Officer: Donald Norwood
Licensee: CTE CAL, Inc.
Region: 4
City: Fremont State: CA
County:
License #: 8327-01
Agreement: Y
Docket:
NRC Notified By: Arunika Hewadikaram
HQ OPS Officer: Donald Norwood
Notification Date: 10/26/2021
Notification Time: 18:59 [ET]
Event Date: 10/26/2021
Event Time: 05:30 [PDT]
Last Update Date: 10/26/2021
Notification Time: 18:59 [ET]
Event Date: 10/26/2021
Event Time: 05:30 [PDT]
Last Update Date: 10/26/2021
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Pick, Greg (R4)
ILTAB, (EMAIL)
NMSS_Events_Notification, (EMAIL)
CNSNS (Mexico), - (EMAIL)
Pick, Greg (R4)
ILTAB, (EMAIL)
NMSS_Events_Notification, (EMAIL)
CNSNS (Mexico), - (EMAIL)
EN Revision Imported Date: 11/2/2021
EN Revision Text: AGREEMENT STATE REPORT - STOLEN MOISTURE DENSITY GAUGE
The following information was received via E-mail:
"On 10/26/21, California Office of Emergency Services (CALOES) contacted the Radiologic Health Branch (RHB) to report a stolen moisture density gauge. The gauge stolen is a Troxler Model 3430, S/N 23760, containing 9 mCi of Cs-137 and 44 mCi of Am-241. The report stated that the gauge was stolen out of user's truck parked at his residence located in San Leandro, CA, between 5:30-6:00 am on 10/26/2021. The licensee had notified San Leandro Police Department of the theft (report number unavailable).
"RHB will be following up on this investigation."
California 5010 Number: 102621
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 - STOLEN MOISTURE DENSITY GAUGE
The following information was received via E-mail:
"On 10/26/21, California Office of Emergency Services (CALOES) contacted the Radiologic Health Branch (RHB) to report a stolen moisture density gauge. The gauge stolen is a Troxler Model 3430, S/N 23760, containing 9 mCi of Cs-137 and 44 mCi of Am-241. The report stated that the gauge was stolen out of user's truck parked at his residence located in San Leandro, CA, between 5:30-6:00 am on 10/26/2021. The licensee had notified San Leandro Police Department of the theft (report number unavailable).
"RHB will be following up on this investigation."
California 5010 Number: 102621
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