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Regional Basic Professional Training Course in Korea

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❙ 257 ❙<br />

4. DESIGN OF NUCLEAR REACTORS<br />

This system may <strong>in</strong>clude, depend<strong>in</strong>g on design requirements: leaktight structures;<br />

associated systems for the control of pressures and temperatures; and features for the<br />

isolation, management and removal of fission products, hydrogen, oxygen and other<br />

substances that could be released <strong>in</strong>to the conta<strong>in</strong>ment atmosphere.<br />

Strength of the conta<strong>in</strong>ment structure<br />

The strength of the conta<strong>in</strong>ment structure, <strong>in</strong>clud<strong>in</strong>g access open<strong>in</strong>gs and penetrations and<br />

isolation valves, shall be calculated with sufficient marg<strong>in</strong>s of safety on the basis of the<br />

potential <strong>in</strong>ternal overpressures, under‐pressures and temperatures, dynamic effects such as<br />

missile impacts, and reaction forces anticipated to arise as a result of design‐basis accidents.<br />

Provision for ma<strong>in</strong>ta<strong>in</strong><strong>in</strong>g the <strong>in</strong>tegrity of the conta<strong>in</strong>ment <strong>in</strong> the event of a severe<br />

accident shall be considered. In particular, the effects of any predicted combustion of<br />

flammable gases shall be taken <strong>in</strong>to account.<br />

Fig. 4.8. Conta<strong>in</strong>ment Structure

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