Environmental Engineering Reference
In-Depth Information
Using the safety factor in the justification of strength and service life of
equipment and piping makes it impossible to assess the reliability of their
elements. From a formal point of view, the probability of partial or complete
destruction in this case should be taken equal to zero.
In fact, the practice of operation of NPP (and other branches of
engineering) indicates that this probability is greater than zero. Therefore,
since it is difficult to evaluate the actual probability of failure (or accuracy
of such estimates is not sufficient high) the concept of maximum design-
Table 1.1
Major components of nuclear power plants with PWR and their degradation mechanisms
degradation
High-
frequency
mechanical
and thermal
fatigue
Low-
frequency
thermal
fatigue
Thermal
embrittle-
ment
Mechanical
wear, decay
and fatigue
Corrosion
fatigue
Corrosion
and FAC
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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