Rod Group and Individual Control System - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 347

During human-machine interface develop-
ment NP, 2000 requirements, applicable to SHC
RG&IC-R, were realized: to information display
devices (video monitors); to means of displayed
and indication of data unreliability; to organization
of visual system and video frame call; to signaliza-
tion of arisen malfunctions, failures and errors; to
acknowledgment of receiving and prohibiting of
alarm messages sending; to conventional symbols
used during data input, display and registration.
Stability of function performance is provided
by SHC RG&IC-R operating stand-alone compo-
nent parts resistance to environmental influence
and mechanical (seismic) influence, as well as by
immunity to change of primary power supply and
to electromagnetic interference.
Environmental influence resistance require-
ments comply with set in Ukrainian norms and
regulations for specified groups of operation
conditions (E.2.2 and E.2.3 - see Chapter 3). SHC
RG&IC-R compliance with the set requirements
is confirmed during validation of deliverable
complete set.
Generalized parameters of seismic influence
(requested response spectrum), is according to
maximum calculation earthquake (7 point) in-
tensity (with regard to, which seismic category
I device stability must be provided) and project
earthquake with 6 point intensity (with regard to,
which seismic category II device stability must
be provided) are set in compliance with require-
ments GOST, 1998 (see Chapter 3), and are more
severe in comparison with NP, 2000 requirements.
Stability to seismic influence is proven by device
prototypes test results.
During deliverable complete set validation
were confirmed operating stand-alone component
parts immunity to: electrostatic discharge; elec-
trical fast transient / burst; surge; radiated radio
frequency electromagnetic field; conducted distur-
bances induced by radio-frequency fields; power
voltage fluctuation, dips, short interruptions and
variations; power frequency variation; pulse and
damped oscillatory magnetic fields; oscillatory

waves; conducted common mode disturbances;
alternating and microsecond impulse disturbances
in ground circuits. Test disturbances parameters
were defined for each type of disturbances in
compliance with NP, 2000 and recommended
International standards in a way by the test results
to confirm the possibility of SHC RG&IC-R
performance in premises with electromagnetic
environment of medium severity.
Independence of performed functions is de-
fined by preservation of capacity to perform the
set functions in case of failure or removal of any
redundant channel or any system connected with it.
For following of independence principle in
SHC RG&IC-R is provided galvanic isolation of
input-output circuits and power supply circuits
with usage of optical separation devices; physi-
cal division of elements, which belong to differ-
ent redundant channels, including placement of
channel forming safety, output and control signals
in separate cabinets; reserved channels power
supply from different sources. In case of any
SHC RG&IC-R component parts failure per-
formance of adjacent systems (E&PRP system,
RPwCUL&APP system, CIS and IRMS) is pre-
served, excluding functions for performance of,
which the required data cannot be received due
to SHC RG&IC-R failures. Any CIS and IRMS
failures and single failures in SHC E&PRP and
RPwCUL&APP systems do not influence the SHC
RG&IC-R capacity to perform its functions. Means
concerning following of independence principle,
which correspond to the actual Ukrainian nuclear
and radiation safety norms and regulations (NP,
2000) and international standards (IAEA, 2002
and IEC, 2011) are provided and realized.
SHC RG&IC-R meets requirements of Ukrai-
nian fire regulations of designing nuclear power
plants. The probability of fire in each operating
stand-alone component parts not more than 10 -6
in a year. Fire prevention means, assumed during
developments, correspond to that regimented in
NP, 2000 and NP, 2008,a Ukrainian norms and
regulations.