Environmental Engineering Reference
In-Depth Information
Chapter 3
Properties of Safety
Important I&C Systems
and their Components
Yuri Rozen
State Scientiic and Technical Centre for Nuclear and Radiation Safety, Ukraine
ABSTRACT
Operation reliability of NPP I&C and its components is considered in this chapter. Besides quantitative
measures, qualitative features that provide required functional reliability such as protection against
Common Cause Failures (CCF), single-failure criterion, redundancy, diversity, prevention of personnel
errors, and technical diagnostics, are discussed. A group of features of NPP I&C and its components,
united by “performance resistance,” is also considered. In particular, they are resistance to environment
inluences, mechanical inluences (including earthquake impacts), insensitivity changes of power supply,
and electromagnetic disturbances. Operation quality issues are considered. By quality (in a broad sense),
the authors mean the accuracy, response rate characteristics, and features of human-machine interfaces.
Features that provide NPP I&C independence from malfunction or removal from operation of system
components (including redundant ones) or from adjacent NPP I&C, and the decrease of possible impact
of components on other adjacent systems (electromagnetic emission, ire safety) are described as well.
INTRODUCTION
• A procedure of development, design,
manufacturing, testing, acceptance and op-
eration of the system and its components
determined by regulations, rules and stan-
dards of nuclear safety should be observed.
for each I&C system.
The steadily growing role of up-to-date instru-
mentation and control (I&C) systems that assure
NPP safety and security requires that:
•
Properties of each I&C system and its
components (hardware and software) at all
life cycle stages should meet requirements
of national and international regulations,
rules and standards of nuclear safety.
IEC standard 61508 (IEC, 2008) interprets
compliance with the indicated requirements as
functional safety
of I&C system.
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