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Regional Basic Professional Training Course in Korea

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10-B. Technical Specifications for Research Reactors & Non‐power Reactors<br />

fuel elements, reflector elements, and regulat<strong>in</strong>g / control / transient rods occupy<strong>in</strong>g the<br />

core grid.<br />

Rod regulat<strong>in</strong>g : The regulat<strong>in</strong>g rod is a low worth control rod used primarily to ma<strong>in</strong>ta<strong>in</strong><br />

an <strong>in</strong>tended power level that need not have scram capability and may have a fueled<br />

follower. Its position may be varied manually or by a servo‐controller.<br />

Rod control : A control rod is a device fabricated from neutron‐absorb<strong>in</strong>g material or fuel,<br />

or both, that is used to establish neutron flux changes and to compensate for rout<strong>in</strong>e<br />

reactivity losses. A control rod can be coupled to its drive unit allow<strong>in</strong>g it to perform a<br />

safety function when the coupl<strong>in</strong>g is disengaged.<br />

Rod transient : The transient rod is a control rod that is capable of provid<strong>in</strong>g rapid<br />

reactivity <strong>in</strong>sertion to produce a pulse.<br />

Reactivity worth of an experiment : The reactivity worth of an experiment is the value of<br />

the reactivity change that results from the experiment, be<strong>in</strong>g <strong>in</strong>serted <strong>in</strong>to or removed<br />

from its <strong>in</strong>tended position.<br />

Excess reactivity : Excess reactivity is that amount of reactivity that would exist if all<br />

reactivity control devices were moved to the maximum reactive condition from the po<strong>in</strong>t<br />

where the reactor is exactly critical (keff=1) at reference core conditions or at a specified<br />

set of conditions.<br />

Reactor safety systems are those systems, <strong>in</strong>clud<strong>in</strong>g their associated <strong>in</strong>put channels, that<br />

are designed to <strong>in</strong>itiate automatic reactor protection or to provide <strong>in</strong>formation for<br />

<strong>in</strong>itiation of manual protective action.<br />

Protective action is the <strong>in</strong>itiation of a signal or the operation of equipment with<strong>in</strong> the<br />

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