Environmental Engineering Reference
In-Depth Information
Every element of the construction, equipment or pipeline of NPP can operate
as long as it preserves its integrity and shape (i.e. strength). Integrity is the
most important property of structural elements of nuclear power plants. The
relationships of the integrity and propagation of fracture (i.e. violation of
integrity) of structural elements are studied by the science of strength.
Strength
is the property of materials and products produced from them
to resist mechanical loads over a specific period of time and in a particular
environment, characterised by temperature, chemical composition and
physical fields, without destruction, while preserving the shape and integrity
to the extent sufficient to perform their functions.
Strength is a fundamental property. For most of the products of modern
technology, including nuclear power plants, strength is the most important
property after the functionality property and determines the properties of
products such as reliability, service life, safety.
The strength properties of the elements of nuclear power plants such as
steam pipes, turbines, bearing elements of structures, lifting mechanisms,
1
st
barrier: fuel matrix (tablet)
2
nd
barrier: fuel element casing
3
rd
barrier: reactor
vessel, main pipelines,
pressure compensator,
elements of steam
generator
4
th
barrier: protective shell
1.22
Physical security barriers and their location.
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