Environmental Engineering Reference
In-Depth Information
Table 8. Generalized working values of mechanical EIF
Type of EIF and Measurements Unit
Values of Mechanical EIF
for a Group of Location Conditions
Р.2.1
Р.2.2
Р.3.1
Р.3.2
Р.3.3
Sinusoidal vibrations:
upper value of displacement amplitude*, mm
0,75
1,5
3,5
3,5
7,5
2
5
10
10
20
upper value of acceleration amplitude**, m/seс
2
upper value of frequency, Hz
150
150
150
150
150
Relative duration, %
100
100
100
100
100
influence direction
Z
Z
Z
Z
X, Y, Z
Mechanical shock:
upper value of peak acceleration, m/sec
2
40
40
70
70
70
100
100
50
50
50
shock impulse duration, msec
influence direction
Z
Z
Z
Z
X, Y, Z
* At frequencies lower than crossover frequency (9-10 Hz) ** At frequencies higher than crossover frequency Note. In the table the
following conventional symbols are used: X - direction along the horizontal plane; Y - direction along the horizontal plane, perpendicular
X; Z - direction along the vertical plane
Table 9. Degrees of test hardness for resistance to mechanical EIF
EIF Type
Degrees of Test Hardness
for a Group of Location Conditions
Р.1.1
Р.1.2
Р.1.3
Р.2.1
Р.2.2
Р.3.1
Р.3.2
Р.3.3
Sinusoidal vibrations
−
−
−
1
2
3
3
4
Mechanical shock
−
−
−
1
1
2
2
3
Note. Sign “-“ means that tests are not executed
every 10 000 years (further - maximum credible
earthquake or MCE).
Devices, which didn't come into category
I, relate to category II earthquake resistance if
failures of performed functions, caused by an
earthquake, can lead to power generation break
(reactor power control, retention of technological
parameters within specified limits, etc.). Device,
related to category II earthquake resistance,
should be resistant to seismic EIF on the place
of its location, caused by an earthquake that can
occur on-site with a repeatability period 1 in 500
years (further - design basis earthquake or DBE).
Devices that cannot be related to categories I or II
by the above specified criteria, relate to category
III earthquake resistance. Earthquake resistance
requirements for them are not regulated.
Seismic EIF on the place of device's location
define response spectrum that considers a possible
response of building and intermediate construc-
tions to horizontal and vertical earth seismic
vibrations, which can be filtered or intensified on
the basis of typical for these constructions own
vibration rate and damping.
Response spectrum is determined by calcula-
tion and / or modeling, taking into account:
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