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ITEM TOOLKIT

ITEM Toolkit Manual

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186 <strong>ITEM</strong> ToolKit Getting Started Guide<br />

What is an Event?<br />

Events appear in both Fault and Event trees, and may represent components unavailability, human errors, system failures,<br />

initiating events, etc.<br />

Adding an Event<br />

1. Select a Basic Event symbol from the Fault Tree Toolbar with the left mouse button (A).<br />

2. Move the mouse cursor to the 1.1 OR Gate within the Fault Tree canvas (B).<br />

3. Once the Gate has been reached, click the left mouse button to add.<br />

4. Repeat the same operation until 3 Basic Event are added below the OR Gate.<br />

5. Click on the Select Symbol to stop adding Events (C).<br />

C<br />

A<br />

B<br />

Types of Event<br />

The following types of Event are available in the Fault Tree Module:<br />

• Basic Event<br />

A Basic event indicates an event for which failure and repair data is available.<br />

• House Event<br />

A House event indicates whether an event is definitely operating or definitely not operating (dormant).<br />

• Undeveloped Event<br />

An Undeveloped event indicates a system event, which is yet to be developed.

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