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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 />

reactor safety system <strong>in</strong> response to a parameter or condition of the reactor facility hav<strong>in</strong>g<br />

reached a specified limit.<br />

10.6. SAFETY LIMITS & LIMITING SAFETY<br />

SYSTEM SETTINGS<br />

10.6.1. Safety Limits<br />

Safety Limit (SLs)s are limits on important process variables that are found to be<br />

necessary to reasonably protect the <strong>in</strong>tegrity of the pr<strong>in</strong>cipal physical barriers that guard<br />

aga<strong>in</strong>st the uncontrolled release of radioactivity. The pr<strong>in</strong>cipal physical barrier is often the<br />

fuel cladd<strong>in</strong>g (which <strong>in</strong> a solution‐type reactor, for example, is the reactor vessel). Safety<br />

limits do not have to be measured directly; they may be derived from important process<br />

variables.<br />

10.6.1.1. Important Process Variables<br />

Important process variables are measurable parameters that <strong>in</strong>dividually or <strong>in</strong><br />

comb<strong>in</strong>ation reflect the basic physical condition of physical barriers. They may <strong>in</strong>clude<br />

fuel temperature, reactor power, reactor coolant flow rate, reactor coolant <strong>in</strong>let or outlet<br />

temperature, pool level, or coolant pressure.<br />

10.6.1.2. Criteria: Reactors with Eng<strong>in</strong>eered Cool<strong>in</strong>g System<br />

❙ 676 ❙

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