International Standard Bases and Safety Classification - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 38

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION STANDARD BASE

Safety systems have been divided into the
groups, which shown in Figure2.

1. Protection systems, which initiate I&C for:
a. Reactor trip.
b. Emergency core cooling.
c. Decay heat removal.
d. Containment isolation.
e. Containment spray.
f. Containment heat removal.
2. Safety actuation systems, which actuate I&C
for:
a. Reactor trip.
b. Emergency core cooling.
c. Decay heat removal.
d. Confinement isolation.
e. Containment spray.
f. Containment heat removal.
3. Safety systems support features:
a. Emergency power supply.
b. Control room habitability.
c. Safety equipment heating and cooling.

IEC Standards Related
Directly to NPP I&C

International Electrotechnical Commission
(IEC) was founded in 1906 in order to facilitate
international cooperation in the field of electrical
and communication technology. Afterwards IEC
sphere of activity was extended by electronics,
instrument engineering, computers and other
branches of modern technology, connected with
information technologies. IEC is the oldest interna-
tional organization of standardization. As of 2011,
IEC members are represented by 81 countries.
IEC member countries cover 80% of the world
population and produce more than 95% of world
electric energy. IEC is the biggest and the most
authoritative organization of standardization in
the world, covering a wide range of issues such
as electrical engineering, electronics, instrument
engineering, and computer technology.
IEC standardization covers two main aspects:

Safety related I&C systems are I&C systems
important to safety that perform other functions
important to safety which are not performed by
I&C safety systems.
Examples of safety related systems are:

• The interchangeability of products.

• Standard methods of measuring and as-

sessing quality and performance.

• Reactor control systems.
• Plant control systems.
• I&C control room.
• I&C ire detection and extinguishing.
• Radiation monitoring.
• Emergency control center.
• Communication equipment.
• I&C fuel handling and storage.
• I&C associated with the operation of the
safety system.
• I&C for monitoring the state of the safety
system.
• Access control systems.

More information on IEC activity can be found
at http:\www.iec.ch. IEC work is organized among
technical committees (ТС), and each TC is respon-
sible for a specific course. Many of technical com-
mittees contains of subcommittees (SC), which
in turn are divided in a range of Working Groups
(WG) (Bouard, 2002; Cox&Shumov, 2011).
The subject of the topic corresponds foremost
to activities of ТС 45 (Nuclear Instrumentation)
and, in particular, to its subcommittee SC 45A
(I&C of nuclear facilities). This subcommittee was
formed in 1963 and is concerned with electronic