| ReturnTo Theme-Group-Choice | Onelevelup |
| 2G002 | Structure of emergency protection for nuclear reactors | |
| G21C9/00 -9/06 | ||
| G21C9/00-9/016 | AA | AA00 REACTOR TYPES |
AA01 | AA02 | AA03 | AA04 | AA05 | AA06 | AA07 | AA08 | AA10 | |
| . Boiling-water nuclear reactors (BWR) | . . Mark I boiling-water nuclear reactors (BWR) | . . Mark II boiling-water nuclear reactors (BWR) | . Pressurized-water reactors (PWR) | . Fast-breeder reactors (FBR) | . . Tank fast-breeder reactors (FBR) | . . Loop fast-breeder reactors (FBR) | . Heavy-water reactors or new converter reactors | . Others and unknown reactor types | ||||
| BA | BA00 FAULT CONDITIONS |
BA01 | BA02 | BA03 | BA04 | BA05 | BA07 | BA08 | BA10 | |||
| . Loss-of-coolant accidents (LOCA) | . Abnormal reactor pressure | . Earthquakes | . Loss of power supply | . Load loss | . Melting of the reactor core (i.e., meltdown) | . Impossibility of insertion of control rods (e.g., anticipated transient without scram [ATWS]) | . Others and unknown abnormalities | |||||
| CA | CA00 OPERATIONAL RESPONSES TO FAULT CONDITIONS |
CA01 | CA02 | CA03 | CA04 | CA05 | CA06 | CA07 | CA08 | CA09 | CA10 | |
| . Pressure control | . . Release of pressure to pressure-control chambers | . . Release of safety valves or relief valves | . Prevention of coolant outflow | . Shock absorption | . Vibration control | . Splashing prevention (i.e., prevention of missiles) | . Emergency cooling | . Support and reinforcement | . Others and unknown operations | |||
| CA11 | ||||||||||||
| . Elimination of the vacuum | ||||||||||||
| DA | DA00 SYSTEMS THAT PROVIDE OPERATIONAL RESPONSES TO FAULT CONDITIONS |
DA01 | DA02 | DA03 | DA04 | DA05 | DA06 | DA07 | DA10 | |||
| . Pressure-control systems | . Normal cooling systems | . Emergency-cooling systems | . Safety systems | . Gas treatment or air-conditioning systems | . Water-treatment systems | . Liquid-metal-treatment systems | . Others and unknown systems | |||||
| EA | EA00 APPARATUSES AND PARTS THAT PROVIDE OPERATIONAL RESPONSES TO FAULTY CONDITIONS |
EA01 | EA02 | EA03 | EA04 | EA05 | EA10 | |||||
| . Pressure-control apparatuses | . . Pressure vents to control tanks (e.g., downcomers) | . . Blowing-out panels | . . Containment spray | . . Ice condensers | . Others, and unknown apparatuses and parts | |||||||
| EA11 | EA12 | EA13 | EA14 | |||||||||
| . Piping | . Vessels | . Pumps | . Valves |