04.02.2013 Views

Regional Basic Professional Training Course in Korea

Regional Basic Professional Training Course in Korea

Regional Basic Professional Training Course in Korea

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

<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 />

The network of weather stations ‐ more precisely its mesh ‐ is poorly suited to<br />

observations of tornadoes. An empirical scale def<strong>in</strong><strong>in</strong>g <strong>in</strong>tensities and attempt<strong>in</strong>g to relate<br />

them to the dimensions of observed damage zones and to the maximum velocities has<br />

been established.<br />

The effects of tornadoes are generally calculated us<strong>in</strong>g probabilistic methods.<br />

5.3.4.4. Extreme cold<br />

To alleviate the effects of frost on safety systems, <strong>in</strong> particular the loss of the cool<strong>in</strong>g<br />

water supply, often simple means provide satisfactory solutions. They <strong>in</strong>clude, for<br />

example, the circulation of discharged hot water or the judicious use of weather‐stripp<strong>in</strong>g.<br />

Even so, it is best to plan the appropriate arrangements when the plant is designed, based<br />

on local climatic conditions.<br />

5.4. EVALUATION OF EXTERNAL HAZARDS DUE<br />

TO HUMAN‐CAUSED EVENTS<br />

5.4.1. General<br />

In site selection studies, the impact of exist<strong>in</strong>g human activities is important, because they<br />

are often the economic justification for locat<strong>in</strong>g a nuclear power plant <strong>in</strong> a particular area.<br />

But, where safety is concerned, their capacity to be sources of external aggression for the<br />

❙ 338 ❙

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!