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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 />

absorber movement for ma<strong>in</strong>tenance, dilution of boron content and refuel<strong>in</strong>g actions) and<br />

a s<strong>in</strong>gle failure <strong>in</strong> the shutdown means shall be taken <strong>in</strong>to account.<br />

Instrumentation shall be provided and tests shall be specified to ensure that the shutdown<br />

means are always <strong>in</strong> the state stipulated for the given plant condition.<br />

4.1.5.2. Reactor coolant system<br />

Design of the reactor coolant system<br />

The reactor coolant system, associated auxiliary systems, and the control and protection<br />

systems shall be designed with sufficient marg<strong>in</strong> to ensure that the design conditions of<br />

the reactor coolant pressure boundary are not exceeded <strong>in</strong> operational states. The reactor<br />

coolant pressure boundary shall be equipped with adequate isolation devices to limit any<br />

loss of radioactive fluid.<br />

The component parts conta<strong>in</strong><strong>in</strong>g the reactor coolant, such as the reactor pressure vessel or<br />

the pressure tubes, pip<strong>in</strong>g and connections, valves, fitt<strong>in</strong>gs, pumps, circulators and heat<br />

exchangers, together with the devices by which such parts are held <strong>in</strong> place, shall be<br />

designed <strong>in</strong> such a way as to withstand the static and dynamic loads anticipated <strong>in</strong> all<br />

operational states and <strong>in</strong> design‐basis accidents. The materials used <strong>in</strong> the fabrication of<br />

the component parts shall be selected so as to m<strong>in</strong>imize activation of the material.<br />

The reactor pressure vessel and the pressure tubes shall be designed and constructed to be<br />

of the highest quality with respect to materials, design standards, capability of <strong>in</strong>spection<br />

and fabrication.<br />

The design of the components conta<strong>in</strong>ed <strong>in</strong>side the reactor coolant pressure boundary,<br />

such as pump impellers and valve parts, shall be such as to m<strong>in</strong>imize the likelihood of<br />

failure and associated consequential damage to other items of the primary coolant system<br />

❙ 252 ❙

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