Glossary and Abbreviations

ABWR

Advanced Boiling Water Reactor (General Electric, GE), boiling light water cooled & moderated.

AP1000

Advanced Passive 1000 MWe class pressurized water reactor (Westinghouse)

AP1000 accident A

Accident A is a severe accident with an intact containment (IC) and the release at a normal containment leakage rate.

AP1000 accident B

Accident B is a severe accident with a containment bypass scenario (BP) resulting from steam generator tube failure (either as the initiating event, or resulting from failure of one or more tubes due to high temperature during accident progression).

BWR

Boiling Water Reactor

BWR accident A

Source term of accident A results from a severe accident, with the containment staying intact. The release to the environment happens at normal containment leakage rates.

BWR accident B

Accident B is assumed to occur during shutdown, with an open Reactor Pressure Vessel (RPV), when cooling of the core is lost. In this scenario fission products have a direct path to the environment via the open RPV and containment. The Passive Flooder System is assumed to be operating, so the core-concrete interaction can be prevented.

EPR

European Pressurized Reactor (Areva NP), pressurized light water cooled & moderated

EPR accident A

Accident A is a severe accident with an intact containment, and a release at a normal containment leakage rate. It considers deposition in the annulus and fuel/safeguards buildings without building ventilation.

EPR accident B

Accident B is a severe accident with small interfacing system LOCA (loss of coolant accident), without fission product scrubbing and fission product deposition in fuel/safeguards building.

PWR

Pressurized Water Reactor