General Provisions - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 18

automated regulation, logic control, but also
reactor protection functions. Similar tasks were
solved by Westinghouse Electric Company at
NPP Sizewell B in England and also by Canadian
corporation Atomic Energy of Canada Ltd. at NPP
Darlington-A. In 2002-2003 Westinghouse Elec-
tric Company imbedded overall I&C systems in
two power units of Czech NPP Temelín, in which
software methods for reactor protection, power
regulation, reactor power limitation, in-core re-
actor monitoring, control of technological equip-
ment, information display in main and emergency
control rooms and radiation safety monitoring were
used. Also programmable electronic devices were
widely used in systems implemented by Siemens
Power Corporation within the last 12 years at a
number of European NPPs and at power units in
China.
Programmable electronic devices at USSR
NPPs were first used in automatic turbine control
systems, developed in the early 1980-s. Nowadays,
at most Ukrainian power units all main functions
of reactor control and protection are performed by
software-hardware complexes based on program-
mable electronic devices.
SHC software is a set of programs, which:

• Prevent personnel errors during reconigu-

ration, maintenance and recovery of SHC.

Application and system software is located in
SHC components - on hard discs in read-only and
random-access memory and / or in logic structures
of complex programmable electronic components,
supports software - on external carriers and/or in
memory of service components. SHC software
also includes copies of current program versions
on external carriers and software documentation.
Development of electronic projects of complex
programmable electronic components is usu-
ally considered as one of programming types,
though it is slightly different from point of view
of requirements to design and verification - see
Kharchenko & Sklyar, 2008.
Figure 5 shows an example of interaction of
hardware and software SHC.

EQUIPMENT FAMILIES

Equipment family (equipment platform) is set of
hardware and software components that may work
co-operatively in one or more defined architectures
(configurations).
The purpose of equipment family creation
- provide a possibility to use uniform hardware
containing into equipment family during design
and packaging of SHC or I&C systems instead
from of separate items of different suppliers
(often not compatible with each other and not
always conformed to system requirements). The
equipment family is characterized by:

• Control operation of all components of
SHC, provide their interaction with each
other, with conjugate peripheral devices
and other SHCs.
• Provide performance of human-machine
interface functions.
• Diagnose components of SHC, conjugate
peripheral devices and connecting lines
during power-up and operation.
• Automate checking of proper operation
of components of SHC and calibration of
measuring channels in the process of main-
tenance and after recovery.

• Functional, structural and constructive
completeness for the main ield of applica-
tion of this equipment family.
• Informational, power, constructive, opera-
tional and other types of compatibility.
• Advanced software, metrological, stan-
dard-methodological,

• Support personnel actions during recon-

iguration of SHC (change of set-points,
blocking of command generation, etc.).

informational and

other types of support.