Environmental Engineering Reference
In-Depth Information
As indicated in Fig. 1.20, nuclear power plant safety is ensured by active
and passive elements that are important for safety.
The passive safety elements include, first of all, all the elements of the
safety barries 1,2,3, and 4 of the NPP as well as the mechanical elements
of systems important to safety (Figs. 1.21 and 1.22).
The most important passive elements which determin in many case the
reliability and safety of nuclear power plants, as well as their economic
characteristics during operation, are equipment and piping.
Suffice to say that the maximum design accident starts with the rupture
Power unit
Reactor core
SSCs (1st and
2nd safety
barriers
)
Primary coolant
circuit SSCs (3rd
safety barrier)
SSCs of normal operation
systems important
for safety
1.21
Systems, structures and components (SSC) of a power unit of a
cooling system; FSS - frontline safety systems; LSS - localising safety
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