Part I - IPA SA

REVISTA ROMÂN DE AUTOMATIC
15
2.2 Controlling and Security System with
data base and processes analysis
Security and monitoring system is connected
to the controlling system from control room
in tritium removal pilot plant. The main
function of this system is to monitor all
parameters in installation.
In figure 3 is presented the diagram block
with the virtual security system and
monitoring system and in Figure 4 is shown a
capture screen from security software from
control room.
Control
room
Protection
System
Virtual
Security
System
Monitoring
system
Tritium Removal Plant
Data
Base
Figure 3. Block diagram with virtual security system (VSS)
Figure 4. Monitoring system for isotopic exchange
installation with security system
The control software will also include the
security and monitoring architecture of a
radioactive fluids-processing plant, mainly
composed of the following principal systems:
a. Interlocking and interconditioning
system – ensures the plant control for good
operation with minimum toxic fluids leaks; it
controls and commands the fluids recovery from
the plant and/or building after accidents as well.
The system must perform the following
functions:
- automatically control the technological
process with the help of the computer;
- command, at the reach of the actuating
threshold, the emergency shutdown and
drainage of the plant;
- command the sealing-off of the bay and
modules, individually;
- to command the closure of the bay
during operation;
- to indicate the levels in the liquid
effluent-collecting tanks;
- to command the ventilation system;
- to command the control system of access
into the technological bay.
These requests are fulfilled by establishing
some measurement parameters, of safe
operation and auto-triggering mode.
Processing the signals coming from the
sensors of process and of toxic emission
concentration, by its own software, secures
the intervention of the protection systems.
b. Dosimetric and emission quality
survey – ensures the dosimetric survey of the
personnel, checks the toxicity level from
within the building and also the gas release
into the environment; it also supplies the
warning values for the radioactive/toxic
substance concentrations.
The system must perform the following
functions:
- the dosimeter survey and of the toxicity
levels in the air and of the operation
personnel;
- monitoring of the working areas;
- supplying the actuating values for
radioactive/toxic fluids concentrations;
- monitoring the toxic gas and liquid leaks.
The system allows for the automatic tripping
(simultaneously with the signal from a
process transducer) of the plant through the
interlocking system. In case of accident, it
triggers the shut-down/discharge of the plant
and its sealing-off.