Environmental Engineering Reference
In-Depth Information
Table 8.4 Important mechanical systems and components and relevant ageing
mechanisms
Fatigue
Thermal
fatigue
Radiation
embrittle-
ment
Wear
Stress
corrosion
Corrosion
in boric acid
environment
`
RPV
x
x
x
x
x
x
In-vessel
structure
x
x
x
x
x
Reactor
supports
x
x
CRDM
x
x
x
Pressurizer
x
x
x
x
Steam
generator
x
x
x
x
MGV and MCP
x
x
x
x
RCS main
circulating
pipes
x
x
x
Pipes connected
to RCS
x
x
x
Hydro-
accumulators
x
ECCS quick-
closing
valves
x
x
ECCS pumps
x
x
x
Low-pressure
ECCS pumps
x
Sprinkler pumps
x
High-pressure
boron pumps
x
x
Pumps of
make-up
system
x
x
Essential service
water tank
x
￿ ￿ ￿ ￿ ￿ ￿
Essential service
water pumps
x
x
Containment
quick-closing
valves
x
x
Normal +
emergency
feed-water
pipes
x
x
Normal +
emergency
feed-water
pumps
x
Safety classifi ed
piping and
piping
elements
x
x
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