Safety Evaluation Of Indian Nuclear Power Plants Post Fukushima Incident
Assessment of Seismic Margins
Station
Seismic
Magnitude
Zone (Richter Scale)
Epicentral
Distance (km)
Design PGA
(g)
Conservative
Margin (PGA) (g)
TAPS 1,2
III
5.7
16
0.2g
0.337 to 1.83 @
RAPS-1,2
II
6.0
40
0.1g
0.233 to 2.26 @
MAPS-1,2
||
6.0
20
0.156 g
0.233 to 2.26 @
NAPS-1,2
IV
6.7
12
0.3g
0.6 #
KAPS-1,2
III
6.5
30
0.2g
0.6 #
KGS-1,2,3,4
III
5.7
12
0.2g
0.6 #
RAPS-3,4,5,6
II
6.0
40
0.1g
0.6 #
TAPS-3,4
III
5.7
16
0.2g
0.337 to 1.83 @
KK 1&2
II
6.0
33
0.15
0.6#
@: These values are based on analysis conducted during the seismic re-evaluation of the plants based on permissible
stress values. Very few components are close to the low Peak Ground Acceleration (PGA) values, majority are close to
0.6g PGA.
#: Design of new plants from NAPS onwards was done for allowable stress values However, the actual stress values are
much less than the allowable values. Based on the analytical values calculated for TAPS 1&2, RAPS 1&2 and MAPS 1&2
and performance of Kasiwaziki Kariwa and Shika NPP's in Japan, GSECL's plant at Jamnagar and Panendhro, IFFCO
plant at Kandla, the Seismic Margin Assessment PGA will be about two to three times those of the analytical values.View entire presentation