Environmental Engineering Reference
In-Depth Information
Figure 2. The structural scheme of the Zaporozhe NPP SPDS
monitoring system - IRMS, neutron flux monitor-
ing system - NFMS, radiation safety control
system - RSCS, reactor control rod system -
RCRS).
The signals of systems external to the SPDS are
transmitted over digital communication channels.
The SPDS is made in the form of an integrated,
distributed open system on the basis of local area
networks (LAN) of two kinds: data LAN and
information LAN.
The data LAN is used to transmit the required
amount of production information between sub-
scribers of the LAN at a predetermined access
time for each subscriber. The LAN made by
Westinghouse Corporation, the type Westnet II+,
is used as the data LAS.
The information LAN is used to transmit
large files of production and service information
between subscribers of the network and, if nec-
essary, to external users. A standard LAN of the
Ethernet type is used as the information LAN.
The LAN combine independent microproces-
sor sub-complexes, which use intelligent hardware
input/output devices, terminal units and, if neces-
sary, signal normalizers.
Structurally the SHC of the SPDS is a two-
level system.
The lower level stations perform input of
continuous and discrete signals from sensors,
reception of data from other unit systems and
primary processing of the derived information.
The upper level stations perform more complex
calculations, ensure maintenance of the man-
machine interface, perform the storage, display,
recording and archiving of data.
The upper level is comprised of workstations
(WEStation) that are specialized in accordance
with functions fulfilled, which are hooked up to
both the Westnet II+ and Ethernet main buses.
Upper level stations are stations on the base of
workstations made by Sun Microsystems Com-
pany with real-time operating system Solaris™
of the UNIX family
Base workstation crates and industrial personal
computers (IPC) are placed in the cabinets, which
perform computing operations that require high
speed, considerable volume of on-line memory and
access to databases in real time (thermotechnical,
economic and other calculations, inspection of
protection devices and interlocks and so forth).
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