United States of America

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INES-event
INES 1

Potential Loss of Containment Due to Small Crack in Torus

On June 27, 2005 at the James A. FitzPatrick plant, inspectors identified a small leak coming from a through-wall crack of the torus shell. The torus crack size was about 4.6 inches long, but with some branching cracks connected to the major crack. The crack at FitzPatrick was located close to an external support column which is welded to the outside of the torus. These external support columns were added in the 1980s as part of the Mark I improvements to stiffen the torus against blowdown stresses. The torus wall is 5/8 inch thick.

Category: Power Reactor United States of America »

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INES 2

Potential Extremity Overexposure at Texas A&M Research Reactor

The licensee reported that an employee at the Texas A&M Nuclear Science Center received 75,800 mRem (758 mSv) to the extremities during the month of January 2006. Furthermore, the licensee reported that the individual also received 37,540 mRem (375.4 mSv) to the extremities during the month of February 2006. The licensee reported that the employee was involved in neutron activation analysis work involving contact lenses and that all ALARA procedures were strictly enforced.

Category: Research Reactor United States of America »

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INES 2

Potential Radiation Overexposure of Radiographers

On March 11, 2005, a California industrial radiography licensee notified the state that two of its employees may have incurred an occupational overexposure. The licensee reported that two radiographers were conducting radiographic operations at a refinery located in Carson, CA using an Industrial Nuclear Corporation Model IR 100 exposure device. The device contained an iridium-192 sealed source with an activity of approximately 3.3 terabecquerels (90 Curies).

Category: Radiation Source United States of America »

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INES 0

Potential Radiation Overexposure to a Radiographer

On August 3, 2004, a licensee notified the Nuclear Regulatory Commission (NRC) an individual’s June film badge had a deep dose reading of 1.2 Sv (121 rem), potentially indicating an exposure in excess of NRC’s regulatory limit of 50 mSv (5 rem) total effective dose equivalent (whole body).

Category: Radiation Source United States of America »

INES-event
INES 2

Presumptive Radiographer Badge Overexposure

On March 9, 2006, the State of Texas notified the Nuclear Regulatory Commission (NRC) of a presumptive badge overexposure for a radiographer trainee. The company reported a film badge reading of 250mSv (25.343 Rem). The State of Texas is following up on the event to determine whether the dose was to the individual or to the badge only.

Category: Radiation Source United States of America »

INES-event
INES 1

Potential Radiographer Overexposure

On May 2, 2005, the State of Texas Department of State Health Services received notification from a radiography licensee indicating that a radiographer may have received a whole body dose of 46.6 millisievert (mSv) or 4.6 rem during the period of March 20, 2005 through April 19, 2005. Based on previous dosimetry results, the individual’s annual cumulative dose is 63.95 mSv (6.4 rem), a dose in excess of the NRC’s annual occupational total effective dose equivalent limit of 50 mSv (5 rem).

Category: Radiation Source United States of America »

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INES 1

Missing Radioactive Gauge

On January 6, 2004, Louisiana Radiation Protection Services notified the Nuclear Regulatory Commission that a licensee’s radioactive device could not be located. The device is a Kay-Ray Model 7063P gauge, with serial number 12349, currently containing a 11.71 Gbq (316.4 milliCurie) source of Cs-137. Since 1984, the device has been stored in a secured wooden crate with proper labeling, inside a locked warehouse with limited access at the licensee’s facility. The device was last accounted for during an inventory conducted on September 4, 2003.

Category: Radiation Source United States of America »

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INES 2

Radiographer Overexposure

On March 3, 2006, the State of Rhode Island notified the Nuclear Regulatory Commission (NRC) that a potential overexposure may have occurred at a fixed radiography location. According to the licensee, a fully qualified radiographer was training a new employee on the components of a radiography camera. They were not aware that the camera they were using for training purposes was actually in use by another radiographer and had a 93 curie iridium-192 source exposed.

Category: Radiation Source United States of America »

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Radiographer Overexposure

On November 19, 2005, the State of Oklahoma notified the Nuclear Regulatory Commission (NRC) that a radiographer received a calculated effective dose of 230 mSv (23 rem), and a hand dose of 1.7 Gy (173 rad), a dose in excess of the NRC’s annual occupational and extremity limit of 50 mSv (5 rem) and 0.5 Sv (50 rem) respectively.

Category: Radiation Source United States of America »

INES-event
INES 2

Radiographer Overexposure

On February 22, 2006, the State of California notified the Nuclear Regulatory Commission (NRC) that a radiographer’s assistant may have received a calculated shallow dose of 1.28-3.58 Gy (128-358 rad) to either hand, a dose in excess of the NRC’s annual occupational extremity limit of 0.5 Sv (50 rem).

Category: Radiation Source United States of America »