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Due to a lapse in appropriations, the NRC has ceased normal operations. However, excepted and exempted activities necessary to maintain critical health and safety functions—as well as essential progress on designated critical activities, including those specified in Executive Order 14300—will continue, consistent with the OMB-Approved NRC Lapse Plan.

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Coolant

Coolant … A substance circulated through a nuclear reactor to remove or transfer heat. The most commonly used coolant in the United States is water. Other coolants include heavy water , air, carbon dioxide, helium, liquid sodium, and a sodium-potassium …

Radiography

Radiography … The use of sealed sources of ionizing radiation for nondestructive examination of the structure of materials. When the radiation penetrates the material, it produces a shadow image by blackening a sheet of photographic film that has been …

Rad (radiation absorbed dose)

Rad (radiation absorbed dose) … One of the two units used to measure the amount of radiation absorbed by an object or person, known as the “ absorbed dose ,” which reflects the amount of energy that radioactive sources deposit in materials through which …

Emergency core cooling systems (ECCS)

Emergency core cooling systems (ECCS) … Reactor system components (pumps, valves, heat exchangers , tanks, and piping) that are specifically designed to remove residual heat from the reactor fuel rods in the event of a failure of the normal core cooling …

Extremities

Extremities … The hands, forearms, elbows, feet, knees, leg below the knees, and ankles. Permissible radiation exposures in these regions are generally greater than those for whole body exposure because the extremities contain fewer blood-forming organs …

Charged particle

Charged particle … An ion . An elementary particle (part of an element ) carrying a positive or negative electric charge. … Charged …

Critical mass

Critical mass … The smallest mass of fissionable material that will support a self-sustaining chain reaction . … Critical mass …

Cleanup system

Cleanup system … A system used for continuously filtering and demineralizing a reactor coolant system to reduce contamination levels and to minimize corrosion. … Cleanup …

Controlled area

Controlled area … At a nuclear facility, an area outside a restricted area but within the site boundary, to which the licensee can limit access for any reason. … Controlled …