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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 />

The aim of the fourth level of defence is to address severe accidents <strong>in</strong> which the<br />

design basis may be exceeded and to ensure that radioactive releases are kept as<br />

low as practicable. The most important objective of this level is the protection of<br />

the conf<strong>in</strong>ement function.<br />

The fifth and f<strong>in</strong>al level of defence is aimed at mitigation of the radiological<br />

consequences of potential releases of radioactive materials that may result from<br />

accident conditions. This requires the provision of an adequately equipped<br />

emergency control centre, and plans for the on‐site and off‐site emergency<br />

response.<br />

A relevant aspect of the implementation of defence <strong>in</strong> depth is the provision <strong>in</strong> the design<br />

of a series of physical barriers to conf<strong>in</strong>e the radioactive material at specified locations.<br />

The number of physical barriers that will be necessary will depend on the potential<br />

<strong>in</strong>ternal and external hazards, and the potential consequences of failures.<br />

Fig.4.1 Concept of Defence‐<strong>in</strong>‐depth<br />

❙ 224 ❙

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