Demo Project

A demonstration project is loaded immediately upon opening EMRALD.

This project evaluates time it takes for a small or large radiological release due to a loss of offsite power (LOSP) of a nuclear plant to occur. The model starts in "Normal_Operations", stops any safety systems, and then samples a failure rate for an LOSP. When in "LOSP", the safety systems start up again then three more events are evaluated as follows: the Emergency Cooling System (ECS) can fail, the Containment Cooling System (CCS) and ECS can fail, or 24 hours can pass. The safety systems starting up are indicated by the moving to Start Systems state, which also moves the model into the ECS Active state and the CCS Active state. Those evaluate logic trees, made up of components represented by component diagrams, determine whether the overall safety systems failed or not.

If ECS system fails, then the model will move to the small release key state.

If CCS system also fails, then the model will move to the large release state, it will override/leave the small release state, and the simulation will end.

If the CCS system succeeds when the ECS system fails, the final event is evaluated, and the 24-hour mission time passes, then the simulation will end in the small release state.

If neither system fails, and therefore, no release occurs, the final event being evaluated and the passing of the 24-hour mission time will move the model back to normal operations. The model will cycle until either a small or large release occurs.

Upcoming sections of the documentation will detail how the model is set up to move between states via events, transition actions, and other structures. The Types of Diagrams section explains the dynamics of the component and system diagrams within the context of this demo project.

Below is a table outlining what acronyms are used in diagram names, event names, or action names.

Name	Description
LOSP	Loss of offsite power
ECS	Emergency Cooling System
CCS	Containment Cooling System
CKV	Check valve
MOV	Motor operated valve
PMP	Pump
DGN	Diesel generator
S-TNK	Storage tank
FR	Fails to run