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Regional Basic Professional Training Course in Korea

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16.2.2. Safety Functions<br />

❙ 899 ❙<br />

16. In‐Plant Accident Management<br />

A safety function is def<strong>in</strong>ed as a condition or action that prevents core damage or<br />

m<strong>in</strong>imizes radiation release to the public. The concept of safety functions <strong>in</strong>troduces a<br />

systematic approach to plant operations based on a hierarchy of protective actions. The<br />

protective actions are directed at mitigat<strong>in</strong>g the consequences of an event and, once<br />

fulfilled, ensure proper control of the event <strong>in</strong> progress. All safety functions are directed<br />

mitigat<strong>in</strong>g an event and conta<strong>in</strong><strong>in</strong>g and/or controll<strong>in</strong>g radioactivity releases. These safety<br />

functions can be grouped <strong>in</strong>to four major classes as below. The number on the right box<br />

represents the hierarchy of the safety function.<br />

anti‐core melt safety functions 1. reactivity control<br />

i. RCS <strong>in</strong>ventory control<br />

i. RCS pressure control<br />

i. core heat removal<br />

RCS heat removal<br />

conta<strong>in</strong>ment <strong>in</strong>tegrity safety<br />

functions<br />

<strong>in</strong>direct radioactive release safety<br />

functions<br />

ma<strong>in</strong>tenance of vital auxiliaries<br />

needed to support the other<br />

safety functions<br />

16.2.3. Standard Post Trip Actions (SPTAs)<br />

i. conta<strong>in</strong>ment isolation<br />

i. conta<strong>in</strong>ment temperature and pressure<br />

control<br />

conta<strong>in</strong>ment combustible gas control<br />

<strong>in</strong>direct radioactive release<br />

1. ma<strong>in</strong>tenance of vital auxiliaries<br />

(AC and DC power)<br />

The purpose of the SPTAs is to provide the entry po<strong>in</strong>t for all EPGs and conta<strong>in</strong>s a check<br />

of safety functions aga<strong>in</strong>st acceptance criteria, along with cont<strong>in</strong>gency actions which can

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