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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 />

necessity for any action to be <strong>in</strong>itiated.<br />

Auxiliary services<br />

Auxiliary services that support equipment that forms part of a system important to safety<br />

shall be considered part of that system and shall be classified accord<strong>in</strong>gly. Auxiliary<br />

services necessary to ma<strong>in</strong>ta<strong>in</strong> the plant <strong>in</strong> a safe state may <strong>in</strong>clude the supply of<br />

electricity, cool<strong>in</strong>g water and compressed air or other gases, and means of lubrication.<br />

4.1.4.4. Provision for <strong>in</strong>‐service test<strong>in</strong>g, ma<strong>in</strong>tenance, repair, <strong>in</strong>spection and monitor<strong>in</strong>g<br />

Structures, systems and components important to safety shall be designed to be<br />

calibrated, tested, ma<strong>in</strong>ta<strong>in</strong>ed, repaired or replaced, <strong>in</strong>spected and monitored with respect<br />

to their functional capability over the lifetime of the nuclear power plant to demonstrate<br />

that reliability targets are be<strong>in</strong>g met. The plant layout shall be such that these activities<br />

are facilitated and can be performed to standards commensurate with the importance of<br />

the safety functions to be performed, with no significant reduction <strong>in</strong> system availability<br />

and without undue exposure of the site personnel to radiation.<br />

4.1.4.5. Equipment qualification<br />

A qualification procedure shall be adopted to confirm that the items important to safety<br />

are capable of meet<strong>in</strong>g, throughout their design operational lives, the demands for<br />

perform<strong>in</strong>g their functions while be<strong>in</strong>g subject to the environmental conditions (of<br />

vibration, temperature, pressure, jet imp<strong>in</strong>gement, electromagnetic <strong>in</strong>terference,<br />

irradiation, humidity, or any likely comb<strong>in</strong>ation thereof) prevail<strong>in</strong>g at the time of need.<br />

The environmental conditions to be considered shall <strong>in</strong>clude the variations expected <strong>in</strong><br />

normal operation, anticipated operational occurrences, and design basis accidents. In the<br />

qualification programme, consideration shall be given to age<strong>in</strong>g effects caused by various<br />

environmental factors (such as vibration, irradiation and extreme temperature) over the<br />

expected lifetime of the equipment. In addition, any unusual environmental conditions<br />

❙ 240 ❙

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