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Regional Basic Professional Training Course in Korea

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6.4.3. Seismic category 1:<br />

6.4.3.1. Seismic category 1:<br />

6. Safety Classification Of Structures, Systems and Components<br />

(a) Process systems: the primary coolant system, the ma<strong>in</strong> steam and feed water<br />

system, the primary heat removal system, the control rod drive system, the safety<br />

<strong>in</strong>jection system.<br />

(b) Electrical systems: the emergency power supply, <strong>in</strong>clud<strong>in</strong>g diesel generators,<br />

auxiliaries and distribution systems.<br />

(c) Instrumentation and control systems: reactor protection and control systems required<br />

for safe shutdown functions, monitor<strong>in</strong>g <strong>in</strong>strumentation to measure important<br />

parameters of the safety functions, control rooms required for safe shutdown.<br />

(d) Structures and build<strong>in</strong>gs which house or support systems for safe shutdown,<br />

power systems, and <strong>in</strong>strumentation and control systems (<strong>in</strong>clud<strong>in</strong>g the<br />

conta<strong>in</strong>ment).<br />

(e) Dams or dykes for site protection.<br />

6.4.3.2. Examples of items <strong>in</strong> seismic category 2 that may <strong>in</strong>fluence the safety functions of<br />

items <strong>in</strong> seismic category 1 or 3 or safety related operator actions are: the turb<strong>in</strong>e<br />

build<strong>in</strong>g, the vent stack, cool<strong>in</strong>g water <strong>in</strong>take structures, access roads.<br />

Seismic <strong>in</strong>duced collapse, fall<strong>in</strong>g, dislodgement or spatial response of structures and<br />

equipment <strong>in</strong> seismic category 2 may generate or cause, for example, the follow<strong>in</strong>g:<br />

debris load<strong>in</strong>g, missiles due to failure of rotat<strong>in</strong>g mach<strong>in</strong>ery, pressure waves due to<br />

burst<strong>in</strong>g tanks, block<strong>in</strong>g of emergency cool<strong>in</strong>g l<strong>in</strong>es, flood<strong>in</strong>g, fire, release of hazardous<br />

substances.<br />

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