United States of America

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INES-event
INES 2

Potential Radiographer Extremity Overexposure

On January 20, 2007, Conam Inspection notified the Nuclear Regulatory Commission (NRC) of a potential occupational extremity overexposure. According to the licensee, a radiographer was conducting radiographic operations using an AEA 660 device containing a 2.85 TBq (77 curies) sealed iridium-192 source. The radiographer approached the device believing the source was in its shielded position and manipulated the source guide tube for the next exposure. Upon returning to crank assembly in an attempt to expose the source, the radiographer realized the source was not in the shielded position.

Category: Radiation Source United States of America »

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Overexposure to 15 members of the public

On November 28, the State of California notified the Nuclear Regulatory Commission (NRC) that 15 members of the public received committed effective dose equivalents ranging from approximately 1.5 to 18 mSv (0.15 to 1.8 rem), doses in excess of the NRC’s annual limit of 1 mSv (100 millirem).

Category: Other United States of America »

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Radiographer Overexposure

On July 25, 2006, the State of Texas notified the Nuclear Regulatory Commission (NRC) that a radiographer received a committed dose of 123 mSv (12.3 rem), a dose in excess of the NRC’s annual occupational limit of 50 mSv (5 rem).

Category: Radiation Source United States of America »

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Worker Overexposure

On November 1, three workers were involved in separating sources, shielded containers, and trash from a barrel. Work was being conducted in a ventilated enclosure within a PEcoS waste processing building. Two workers inside the enclosure were wearing respirators and the supervisor, who was not wearing a respirator, was immediately outside the enclosure directing the work. At the end of the day, the supervisor noted he was contaminated. The supervisor was scheduled for whole-body counting at the Battelle facility early the next day.

Category: Radwaste Facility United States of America »

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Radiography Overexposure

On October 4, 2006, the State of Texas notified the Nuclear Regulatory Commission (NRC) that an industrial radiographer’s dosimeter analysis indicated that the individual exceeded the NRC’s annual occupational total effective dose equivalent limit of 50 millisievert (mSv) or 5 rem.

Category: Radiation Source United States of America »

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Potential Flooding Common Mode Failure of Service Water Pumps

On July 18, 2006, V.C. Summer determined that their existing plant configuration did not match the assumptions in the Service Water (SW) Pump House flooding design calculations.

Category: Power Reactor United States of America »

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INES 1

Stolen Radiographic Exposure Device

On September 13, 2006 the Texas Department of State Health Services notified the Nuclear Regulatory Commission (NRC) that a radiography truck was stolen. An iridium 192 source with an activity of approximately 3.7 terabecquerels (100 Ci) was stored on the truck. The truck was parked at a gas station and the driver was in the store talking with his supervisor. The keys were reportedly left in the vehicle. The event was reported to the local law enforcement authorities, FBI, and the state of Texas.

Category: Radiation Source United States of America »

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Potential Radiography Overexposure

On June 6, 2006, the State of Louisiana notified the Nuclear Regulatory Commission (NRC) that two individuals conducting radiographic activities may have received an effective dose in excess of NRC's annual occupational limit of 50 millisievert (mSv) or 5 rem.

Category: Radiation Source United States of America »

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INES 2

Spill of High-Enriched Uranium Solution

In a facility authorized to process high-enriched uranium (HEU), a glovebox enclosure containing bag filters was connected to a transfer line for HEU solution when a new process system was first constructed. The facility operator decided not to use the filter glovebox enclosure when it began processing HEU solution in the new process system but left the enclosure connected to the HEU transfer line. Before the event, a system diagram was updated and mistakenly indicated that a sample valve was a ball valve.

Category: Other United States of America »

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Plant Design for Flooding Events May Not Mitigate the Consequences of Piping System Failures

During a past inspection, Nuclear Regulatory Commission inspectors identified, and Kewaunee later reported, that the Kewaunee plant design for internal flooding events may not mitigate the consequences of non-safety related piping system failures in the turbine building. High water level in the turbine building would result in water flowing into certain Engineered Safety Features (ESF) equipment rooms because ESF rooms are separated from the turbine building by non-water-tight doors and the plant floor drain system.

Category: Power Reactor United States of America »