Properties of Safety Important I&C Systems and their Components - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 90

Table 6. Test values of EIF of environment

Type Of EIF And Measurements Unit Test Values of EIF

for Degrees of Test Hardness (see Table 5)

1 2 3 4

Air temperature (exposure time, h, not less):
low, not more 15°С (6 h) 15°С (6 h) 15°С (6 h) 15°С (6 h)

upper, not less 40°С (6 h) 50°С (6 h) 75°С (6 h) 150°С (10 h)

Rate of change, not less − 5°С / h 10°С / h 20°С / h

Relative humidity (exposure time, h, not less):
low, at 15°С, not more − 10% (24 h) 5% (24 h) 5% (24 h)

upper, at 30°С, not less − − 90% (72 h) 100% (72 h)

at 40°С, not less 90% (6 h) − − −

at 50°С, not less − 100% (6 h) − −

at 75°С, not less − − 100% (6 h) −

at 150°С, not less − − − 100% (6 h)

Barometric pressure
(exposure time, h, not less):
low, not more − − −

50 кPа (24 h)

upper, not less 130 (5 h) − −

560 кPа (24 h)

0,3·10 -4 Gy / h 1,5·10 -4 Gy / h 9·10 -4 Gy / h 0,03 Gy / h*
3 Gy / h**
* Test value for products, located outside of technological boxes ** Test value for products, located inside of technological boxes Note.
Sign “-“means that tests are not executed

Absorbed dose rate of ionizing radiation,
not less

Table 7. Groups of location conditions

Sources
of Mechanical EIF

Group of Operation
Conditions

Mounting Technique Group of Location

Conditions

Absent Any On building constructions Р.1.1

On supporting constructions Р.1.2

On technological equipment Р.1.3

Available Е.1.3, Е.1.4, Е.2.2 On building constructions Р.2.1

On supporting constructions Р.2.2

Е.1.1, Е.1.2, Е.2.1 On building constructions Р.3.1

On supporting constructions Р.3.2

On technological equipment Р.3.3

Devices, participating in performance of
those functions that should be initiated and / or
performed during an earthquake (emergency reac-
tor shutdown, interlocking of driven mechanisms,
etc.) or directly after an earthquake (emergency
reactor cooling, residual heat removal, automatic

control of critical parameters, radiation environ-
ment control, etc.) relate to categories I earthquake
resistance. Device, related to category I earthquake
resistance, should be resistant to seismic EIF on a
place of its location, caused by an earthquake that
can occur on-site with a repeatability period of