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408 Fundamentals of Magnetic Thermonuclear Reactor Design
l Ensuring the efficiency of safety important systems and components.
l Ensuring adequate qualification and safety culture of the staff (the human
factor).
Level 2
l Prevention of incident development into AWDB by ongoing monitoring of
the systems and equipment status to promptly detect and correct deviations
from prescribed limits and operating conditions.
Level 3
l Management of accidents within the design basis using safety-related sys-
tems, prevention of AWDB escalation into accidents beyond the design ba-
sis; mitigation of the consequences of accidents by detecting and containing
harmful substances and bringing the facility under control.
Level 4
l Management of accidents beyond the design basis, that is, taking measures
to mitigate ABDB consequences, protecting the integrity of barriers and
bringing the reactor back under control.
Level 5
l Emergency planning, including the development and realisation of on-site
and off-site emergency plans to mitigate the consequences of external re-
leases of harmful substances.
The defence in depth protection principle is applied at every stage of the
reactor’s life cycle [5].
14.3.3 Radiation Safety Functions
The principal function of the fusion reactor safety systems is to confine radioac-
tive and other harmful substances and risks within design safety limits to ensure
that the facility meets safety requirements in all operational states (Fig. 14.2).
FIGURE 14.2 Functions of fusion reactor safety system.
