Rod Group and Individual Control System - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 321

• Preservation of operational system connec-

tions with other power unit I&C-systems:
emergency and preventative reactor protec-
tion (E&PRP) system; reactor power con-
trol, unloading, limitation and accelerated
preventive protection (RPwCUL&APP)
system; in-core reactor monitoring (IRM)
system; computer

ware-hardware complexes from other providers
such functions are performed by microprocessor
controllers and/or industrial PCs under system and
application software. The use of FPGA provides
high flexibility (adjustment to realization of differ-
ent I&C functions) comparable to the computing
hardware programmable means capabilities, and,
at the same time, good predictability of behavior
and testability of SHC RG&IC-R main functions,
typical for the devices with unconditional logic
(“hard-wired technology”). It decreases the risk
of common cause failures, which can be caused
by the errors during FPGA electronic design
development, in comparison with the risk of pos-
sible hidden errors during computing operations
programming. Besides, parallel (simultaneous)
way of FPGA functions realization allowed to
increase SHC RG&IC-R speed.

information system

(CIS);

• Preservation or reduction of the existing

cable lines;

• Improvement of application properties and

operational durability (reliability, main-
tainability, availability) by using of modern
information technologies, new electronic
components produced by world leading
manufacturers, industrial PCs, diagnostics,
etc.;

• Compliance with requirements of nuclear

and radiation safety rules and norms, oblig-
atory requirements of any other Ukrainian
standards and

BACKGROUND

international standards

requirements. Chapter 8 provided information on way of neutron

power control by moving of the absorbing rods
in the reactor core and a short description of the
system, which performs functions of rod group
and individual control being a part of reactor
control and protection system at the Ukrainian
NPPs. In this Chapter the detailed information
on the purpose, performed functions, technical
specifications, composition, structure and soft-
ware of the SHC RG&IC-R complex within the
modernized RG&IC system at South-Ukrainian
NPP unit 1 is provided, along with the assurance
of its functional safety.
Information on control rod drives and sen-
sors of control rod position is provided in this
Chapter in quantity required for understanding of
SHC RG&IC-R performance; detailed descrip-
tion, specifications and experience of using of
such peripheral equipment is given in the topic
Nikituk, 2004.
Characteristics of RG&IC system and SHC
RG&IC-R, provided in this Chapter, are the

As a technical base of rod group and individual
control system modernization on power unit 1
at South-Ukrainian NPP the designed Research
and Production Corporation (R&PC) “Radiy”
software-hardware complex SHC RG&IC-R
was accepted. The use of this complex for mod-
ernization of similar systems at the other South-
Ukrainian NPP power units is provided.
SHC RG&IC-R is designed for work with
the peripheral equipment (control rod drives and
sensors of control rod position) of all types used
at the Ukrainian NPPs.
All main SHC RG&IC-R functions (input
signals transformation, logical operations perfor-
mance, control algorithms realization, forming of
controlling actions on control rod drives) and a
range of auxiliary functions (diagnostics, etc.) are
realized basing on field programmable gate arrays
(FPGA), which electronic designs are developed
and implemented by RPC “Radiy”, while in soft-