
 DOESTD301496
APPENDIX C
Degen Formula (1980)
Based on experimental investigations, Peter Degen (Reference 8) proposed a
partial revision to the Modified NDRC formula (Reference 4). The basic
penetration depth, x, computed by the Modified NDRC can be used to compute
the perforation thickness as follows:
tp
x
0.69
1.29
D
D
(C 613)
tp
for 2.65
18
D
or
tp
2
x
x
2.2
0.3
D
D
D
(C 614)
x
for
1.52
D
To prevent perforation, minimum concrete thickness, td, shall be
1.2 tp.
CRIEPI Formula (1985)
The Central Research Institute of the Electric Power Industry (CRIEPI) of Japan
the CRIEPI formula, which amended the Modified NDRC formula and the Chang formula
given by:
C12

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