Rod Group and Individual Control System - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 331

CONSTRUCTION PRINCIPLES

influences, simulating disturbances of each type
and places of their application, also as criteria of
estimation coordinate with international standards
devoted Electromagnetic compatibility (EMC)
and identical to them Ukrainian state standards
(see Chapter 3 and Rozen, 2007; Rozen, 2008).
Reliability measures define fulfilling reliability
of control and information functions according
criteria described in Chapter 3 (Table 1).
Mean Time to Restoration (MTTR) for de-
vices recoverable on operating site and fulfilling
control functions - no more 1 hour, fulfilling
information functions - no more 2 hours. Com-
ponent parts, which include in operating stand-
alone devices, permit replacement without
power shutdown and without own adjustment and
adjustment of the other connected component
parts. Mean life (durability measure) of deliver-
able complete set are not less than 30 years.

Composition of deliverable complete set SHC
RG&IC-R is shown at Table 2, structure of a
software-hardware complex - at Figure 2 (for
basic control functions) and Figure 3 (for basic
information and additional functions).
For data exchange between SHC RG&IC-R
component parts (devices) electrical discrete
signals and / or) digital messages sent via fiber-
optic communication lines are used. Data on CR
position are sent to sensors of CR position, which
are in MCR and ECR, in form of electrical analog
direct current signals. Messages from workstation
are sent to In-core reactor monitoring system and
unit computer information system via duplicated
optical communication channel using ТСР / IP
protocol.
The deliverable set includes electrical and
optical cables, which connect all operating stand-
alone component parts of SHC RG&IC-R, and
also optical cables and related equipment (com-
mutation switches, adapter units) for data transfer
to IRMS and CIS.

Table 1. Reliability measures of SHC RG&IC-R

Function Measures

availability failure flow

parameter

mean time between
failures

Execution of ERP commands 0.99999 1,0∙10 -5 1 / h -

Execution of RAPP commands 0.99999 2,0∙10 -5 1 / h -

Execution of PRP1 commands 0.99997 3,0∙10 -5 1 / h -

Execution of PRP2 commands 0.99997 3,0∙10 -5 1 / h -

Execution of RPwAR (B↑, D↓) commands 0.999985 1,0∙10 -5 1 / h -

Execution of operator commands 0.999985 1,0∙10 -5 1 / h -

Information to MCR panel 0.999 1,0∙10 -4 1 / h -

Display of operator directives 0.99996 2,0∙10 -5 1 / h -

Display of CR positions - - 1.0∙10 5 h

Output information about CR position to IRMS - - 2.5∙10 4 h

Output digital messages to CIS - - 2.0∙10 4 h