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Regional Basic Professional Training Course in Korea

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❙ 233 ❙<br />

4. DESIGN OF NUCLEAR REACTORS<br />

The method for classify<strong>in</strong>g the safety significance of a structure, system or component<br />

shall primarily be based on determ<strong>in</strong>istic methods, complemented where appropriate by<br />

probabilistic methods and eng<strong>in</strong>eer<strong>in</strong>g judgment, with account taken of factors such as:<br />

The safety function(s) to be performed by the item;<br />

The consequences of failure to perform their function;<br />

The probability that the item will be called upon to perform a safety function; and<br />

The time follow<strong>in</strong>g a PIE at which, or the period throughout which, it will be called<br />

upon to operate.<br />

The design shall ensure that any failure <strong>in</strong> a system classified <strong>in</strong> a lower class will not<br />

propagate to a system classified <strong>in</strong> a higher class.<br />

4.1.4.2. General design basis<br />

The design basis shall specify the necessary capabilities of the plant to cope with a<br />

specified range of operational states and design basis accidents with<strong>in</strong> the def<strong>in</strong>ed<br />

radiological protection requirements. The design basis shall <strong>in</strong>clude the specification for<br />

normal operation, conditions created by the PIEs, the safety classification, important<br />

assumptions and, <strong>in</strong> some cases, the particular methods of analysis.<br />

In addition to the design basis, the performance of the plant <strong>in</strong> specified accidents beyond<br />

the design basis, <strong>in</strong>clud<strong>in</strong>g selected severe accidents, shall also be addressed <strong>in</strong> the<br />

design. The assumptions and methods used for these evaluations may be on a best<br />

estimate basis.<br />

Categories of plant conditions<br />

The plant conditions shall be identified and grouped <strong>in</strong>to a limited number of categories

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