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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 />

9.4.4.3. Management actions<br />

Accident management actions after core damage should be credited as part of the CET,<br />

provided that the follow<strong>in</strong>g guidel<strong>in</strong>es are followed:<br />

The recovery actions are <strong>in</strong>cluded as part of emergency operat<strong>in</strong>g procedures for<br />

the plant under consideration;<br />

The CET quantification is based on a realistic human reliability analysis;<br />

The effect of the environmental conditions result<strong>in</strong>g from a severe accident on the<br />

survivability of active components must be considered (pressure and temperature,<br />

radiation, hydrogen combustion, aerosol load<strong>in</strong>g, etc.);<br />

Potential adverse effects of recovery must also be taken <strong>in</strong>to account.<br />

9.4.5. Source term evaluation<br />

The CET will provide the conditional probability that a conta<strong>in</strong>ment failure mode can be<br />

realized, given a PDS. The CET produces a large number of end states, some of which<br />

are either identical or similar <strong>in</strong> terms of key release attributes. The end states are often<br />

grouped <strong>in</strong> release b<strong>in</strong>s, referred to as release categories. These release categories group<br />

CET end states that would be expected to have similar radiological characteristics and<br />

potential off-site consequences.<br />

The source term <strong>in</strong>formation that the level 3 PSA requires for each release category covers:<br />

The radionuclides, <strong>in</strong>clud<strong>in</strong>g also the chemical form of each radionuclide;<br />

The frequency (or frequency distribution) of each release category;<br />

The amount of radionuclides released as a function of time, expressed as fractions<br />

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