Environmental Engineering Reference
In-Depth Information
During PRP-1 preventative protection com-
mand or command of reactor unloading (RPwU)
every signal forming cabinet forms signals, which
initiate downwards movement of CR and transmits
them via fiber-optical lines (marked in Figure 6
as control bus) to power control cabinets, which
control main group drives. After the main group
reached position of lower intermediate switcher
signal forming cabinet starts transmission of
signals, which initiate movement of CR also to
the power control forming cabinets, which control
auxiliary group drives. Transmission of signals
on main CR group movement is stopped as it
reaches position of lower limit switcher.
In the same way forming and sending of sig-
nals on upward (downward) CR movement by
the command of automatic control B↑ (D↓) from
SHC RPwCUL&APP or from group control key
on control and monitoring panel (if group selec-
tion switch is set in position, which corresponds
moving of groups in design order). If switch is
set on a specific CR group, upwards (downwards)
movement signals are transmitted via control bus
only to the power control cabinets, which control
the selected group drives. By command B↑ (D↓)
from individual control key on control and moni-
toring panel every signal forming cabinet forms
upwards (downwards) movement signal and sends
it by control bus to power control channel, which
controls the selected CR group drive.
Forming and transmission of signals in per-
formed in accordance with commands control
priorities. During PRP-2 command from the first
or second SHC E&PRP set, as well as in case
of influence on key set on MCP, which controls
opening of valve pure condensate input into the
first circuit, forming and sending of any signals
on CR upwards movement is blocked. If com-
mands received from different sources require
simultaneous movement of two CR groups, the
highest priority has preventive protection com-
mand PRP-1, lower -RPwU and manual control
command D↓, next - manual control command
B↑, the lowest priority have commands B↑ and
D↓ from the RPwCUL&APP system. To bring
all CR, which did not reach upper (while lift)
or lower (while lowering) end switch to the end
position dragging algorithm is performed for the
rest CR after the respective group is no longer
the main one.
Each signal forming cabinet forms and sends
to control and monitoring panel data on vertical
position of all CR, misalignment of CR in each
group and alarm message in case of excess of al-
lowable misalignment (± 40 mm) in, at least, one
group. With the help of SFC diagnostic blocks
of signal forming cabinet continuous automatic
monitoring of components and connection lines
technical condition is performed. Diagnostic
message on the monitoring results and data on
the received commands from first and second set
E&PRP system, RPwCUL&APP system, control
and monitoring panel are sent to workstation via
fiber-optic lines (Figure 3). Generalized signal
about faults is sent to workstation via separate
lines from every signals forming cabinet, where
failure any component parts or defect intercon-
necting lines are detected.
Panel PC with touch-screen display and du-
plicating keyboard is used for setting (change)
of group components and selection of CR group.
On the computer display snapshots with data on
control mode, received commands, coordinates
of selected CR, number of the moving group in
case of manual control, etc., can be displayed.
CR position cabinets
are intended for work
with linear or stepwise position sensors.
Linear position sensor
consists of coil block,
case, cover and magnetic shunt. Coil block includes
mechanically-connected single-wound coils:
seven base ones placed at the same distance from
one another and two reserve: one is placed between
the first and the second, the other - between the
second and the third base coils. In order to iso-
late the first circuit, coil block is placed in solid
sealed case in form of variable section pipe made
of non-magnetic steel. The whole case along with
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