Environmental Engineering Reference
In-Depth Information
•
Three-channel structure of each set us-
ing logical condition “two of three” while
forming protection commands on indepen-
dent channels signals;
which are connected on-site by electrical and
optical communication links. The set includes:
• Three identical signal forming cabinets,
which form three autonomous inter-redun-
dant protection channels;
• Cross output cabinet, which form set out-
put signals basing on data received from
three signal forming cabinets;
• Workstation which performs data ar-
chiving, displaying and registration;
• Automated operator workplace intended
for displaying of control parameters, con-
dition of discrete input and output, as well
as the reasons of protection actuation.
•
Primary use of parametrical discrete signal
(in form of low and high resistance of elec-
tric circuit, receiving energy from the load)
and logical agreement, on which signal ac-
tive state is represented by high resistance
of the chain (for example, breaking of nor-
mally opened contacts due to output relay
winding disconnecting of power supply);
•
Electric power supply of each set from
three autonomous sources, duplication of
secondary feed block in each channel and
their connection to reliable power sourc-
es, according to scheme allowing to save
set capacity in case of loss of one or two
sources.
The common feature for both sets is automated
technologist workplace where the operability test-
ing of SHC E&PRP parts can be carried out, as
well as set-points change.
Each signal forming cabinet receives the re-
quired data in form of continuous electrical and
discrete signals from its “own” sensors set and
software-hardware complex adjacent I&C sys-
tems: neutron flux monitoring system (NFMS),
in-core reactor monitoring system (IRMS), rod
group and individual control (RG&IC) system,
as well as from seismic sensors. The signals from
these sources are connected to signal forming
cabinet via intermediate terminal blocks cabinet.
Construction of terminal blocks allows to send test
impacts imitating input signals from the test bench
without external cables disconnection.
The output control and indicating signals
are sent via communication lines to the cross
output cabinet from each signal forming cabinet.
After the signals processing according to logical
condition “two or more of three”, ERP com-
mands form in the cross output cabinet of each
set and they are transferred via communication
lines to RG&IC system, turbine control system
(TCS), boron regulation system (BRS), power
supply system of control rod drives (PSS). PRP
commands are formed according to a logical
Since 2003 the modernization of the current
emergency and preventative reactor protection
systems at Ukrainian NPPs had started. The techni-
cal base of modernization was equipment family
(platform), developed by Research and Production
Corporation “Radiy” (Bachmatch, 2008), and
software-hardware complexes of emergency and
preventive reactor protection were created on its
base. In 2004-2005 SHC E&PRP were produced
and delivered for power unit 4 Rovno NPP. In 2007-
2009 according to the European Union program
of Technical Assistance for the Commonwealth of
Independent States (TACIS) the modernization of
power unit 1 reactor control & protection system
at Khmelnitsky NPP was performed.
SHC E&PRP (Figure 1) consists of two au-
tonomous functionally identical sets, each of them
can be removed for performance testing (control
and indicating signals forming accuracy in case
of imitation of limits and safety performance
violations).
Each set is designed in a form of operation-
ally autonomous component parts combination,
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