Access hatch
Access hatch … An airtight door system that preserves the pressure integrity of the containment structure of a nuclear reactor , while allowing access to personnel and equipment. … Access …
Filter Search Results
Image
Search Results
Cold shutdown
Cold shutdown … The term used to define a reactor coolant system at atmospheric pressure and at a temperature below 200 degrees Fahrenheit following a reactor cooldown . … Cold …
Containment structure
Containment structure … A gas-tight shell or other enclosure around a nuclear reactor to confine fission products that otherwise might be released to the atmosphere in the event of an accident. Such enclosures are usually dome-shaped and made of …
Departure from nucleate boiling ratio (DNBR)
Departure from nucleate boiling ratio (DNBR) … The ratio of the heat flux needed to cause departure from nucleate boiling to the actual local heat flux of a fuel rod . … Departure from nucleate boiling ratio …
Film badge
Film badge … Photographic film used to measure exposure to ionizing radiation for purposes of personnel monitoring. The film badge may contain two or three films of differing sensitivities, and it may also contain a filter that shields part of the film …
Orphan sources (unwanted radioactive material)
Orphan sources (unwanted radioactive material) … Sealed sources of radioactive material contained in a small volume (but not radioactively contaminated soils and bulk metals) in any one or more of the following conditions: An uncontrolled condition that …
Source material
Source material … Uranium or thorium, or any combination thereof, in any physical or chemical form, or ores that contain, by weight, one-twentieth of one percent (0.05 percent) or more of (1) uranium, (2) thorium, or (3) any combination thereof. Source …
Safety-related
Safety-related … In the regulatory arena, this term applies to systems, structures, components, procedures, and controls (of a facility or process) that are relied upon to remain functional during and following design-basis events . Their functionality …
Top event
Top event … The events across the top of the event tree , which graphically represent the systems needed to keep the plant in a safe state following an initiating event (i.e., a challenge to plant operation). A top event is the starting point of the fault …
Deterministic (probabilistic)
Deterministic (probabilistic) … Consistent with the principles of "determinism," which hold that specific causes completely and certainly determine effects of all sorts. As applied in nuclear technology, it generally deals with evaluating the safety of a …