Emergency and Preventive Reactor Protection Systems - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 318

REFERENCES

class technical means. During the development
the fundamental safety principles were complied
(coping of common cause failures, redundancy,
independent, diversity, etc.) and requirements of
current Ukrainian and International NPP safety
regulations and standards. The accepted concep-
tion of successive multistep tests provided suf-
ficient depth and validity of the results.
The complexes comply to the fire safety,
seismic resistance, electromagnetic compatibility
requirements, they are resistant to external effects
possible at the operating site, including power
circuit noise, ground network noise, signals and
command transmission chains noise, communi-
cation lines noise, as well as room space noise,
where the operating stand-alone items are located.
The inbuilt diagnostic system, independent
from the elements engaged in main control and
information functions performance, provides
automatic technical state test after power supply
switch-on and continuous defects detection during
the performance (with the depth to interchange-
able part), archiving, display and registration of
diagnostic messages. The possibility of quick
recovery by “hot” change of failed component
(without normal operation mode switch-off) is
provided.
All SHC E&PRP sets passed the whole licens-
ing cycle and were admitted as complying with
the respective requirements of the national and
international nuclear safety regulatory documents
and used almost at all Ukrainian NPP units.
Successful operation experience (since No-
vember 2003) proved the propriety of made
technical decisions and SHC E&PRP use per-
ceptiveness for emergency and preventative unit
protection systems reconstruction at the NPPs
and for new NPPs.

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