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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 />

Reactivity differences<br />

Limits on permissible reactivity differences between predicted and actual critical<br />

configurations of reactivity control devices shall be stated, and conformance shall be<br />

verified dur<strong>in</strong>g <strong>in</strong>itial criticality, after every major refuel<strong>in</strong>g, and at specified <strong>in</strong>tervals.<br />

The cause of significant differences shall be evaluated and necessary corrective action<br />

taken.<br />

Liquid poison systems<br />

Concentration, storage and temperature limits affect<strong>in</strong>g solubility shall be stated for all<br />

liquid poison systems and appropriate measures specified to ensure detection and<br />

correction of deviations from these limits. Operability requirements to ensure proper<br />

actuation and function<strong>in</strong>g of the systems shall be stated.<br />

Boron dilution prevention<br />

Requirements for boron concentration <strong>in</strong> the coolant shall be established if necessary to<br />

ma<strong>in</strong>ta<strong>in</strong> an acceptable shutdown marg<strong>in</strong>. Boron concentration shall be monitored to<br />

assure that it is not reduced below the prescribed level.<br />

Reactor protection system<br />

Operability requirements for reactor protection and other safety system <strong>in</strong>strumentation<br />

and logic, together with limits on response times, <strong>in</strong>strument drift and accuracy, where<br />

appropriate, shall be stated. Interlocks required by the safety report shall be identified and<br />

appropriate operability requirements stated.<br />

10.3.2.2. Core cool<strong>in</strong>g<br />

Coolant temperature<br />

Limits of coolant temperature (maximum or m<strong>in</strong>imum) and rate of temperature change<br />

shall be stated for the various modes of normal operation to ensure that specified safety<br />

❙ 642 ❙

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