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Regional Basic Professional Training Course in Korea

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<strong>Regional</strong> <strong>Basic</strong> <strong>Professional</strong> <strong>Tra<strong>in</strong><strong>in</strong>g</strong> <strong>Course</strong> (BPTC) on Nuclear Safety<br />

FIG. 9.2. Example of a s<strong>in</strong>gle event tree<br />

For example, this applies to the follow<strong>in</strong>g conditions:<br />

Prolonged dry out of the core with no means of <strong>in</strong>jection available;<br />

Clad temperature above 1204°C;<br />

Exceed<strong>in</strong>g primary system test pressure;<br />

These criteria enabl<strong>in</strong>g characterization of core damagedown are <strong>in</strong>troduced for the<br />

purposes of simplification, which <strong>in</strong>troduces a degree of conservativeness.<br />

9.2.4.3. Physical calculations<br />

In many cases, there is not sufficient material available from the analysis of accident<br />

sequences to draw clear-cut conclusions about the consequences of such sequences, and<br />

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