Environmental Engineering Reference
In-Depth Information
In each NFM three independent interredundant
channels can be selected (Figure 8).
Channel includes:
Built-in panel computers, recordings on re-
movable media device, digital indicator located
in MCR, and аudio alarm placed on the board of
refueling machine control system (RMCS) are
common for the three channels.
Each device for data collection and processing:
• Three neutron level detectors (sensors S)
- for measurement of neutron lux density
in subranges controlled during nuclear fuel
reloading, reactor start-up and power op-
eration, respectively.
• Devices for data collection and processing
(DC&P 1, 2 or 3), implemented in a sepa-
rate cabinet.
• Manual control means and warning means
located in MCR.
• Device (not shown in Figure 8) that during
nuclear fuel reloading provides a possibil-
ity for manual control of transfer mecha-
nisms of neutron level detectors and indi-
cation of their position.
Receives encoded signals, corresponding
to neutron lux density value, from neu-
tron level detectors, operating in a required
measuring subrange.
Calculates relative neutron power Рw (in
percentage of the reactor power nominal
value), the period of power change Т and
reactivity.
Compares calculated values of relative
neutron power and the period with speci-
ied limit values (set-points).
Figure 8. Structure of a typical reactor control and protection system
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