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Publicatie Laka-bibliotheek:
Safety of CANDU nuclear power stations (1985)

Auteur	V.G.Snell
Datum	1985
Classificatie	6.01.3.30/01 (VEILIGHEID - REACTOREN - CANDU)
Voorkant

Abstract

A nuclear plant contains a large amount of radioactive material which could be a 
potential threat to public health. The plant is therefore designed, built and operated 
so that the risk to the public is low. Careful design of the normal reactor systems is 
the first line of defense. These systems are highly resistant to an accident happening 
in the first place, and can also be effective in stopping it if it does happen.
We back up the normal systems with special independent and redundant safety 
systems. Their sole purpose is to minimize the effects of an accident, or to stop 
it completely. They include shutdown systems, emergency core cooling systems, and 
containment systems. We also show that massive impairment of any one safety 
system, together with an accident, can be tolerated. This "defense in depth" approach 
recognizes that men and machines are imperfect and that the unexpected happens. 
The nuclear power plant need not be perfect to be safe. To allow meaningful 
judgments, we must know how safe the plant is. The Atomic Energy Control 
Board guidelines give one such measure, but there are several reasons why these 
may over-estimate the true risk. We interpret the guidelines as an upper limit to 
the total risk, and trace their evolution.

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