الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
VC1-d formation and growth in the cladding and
structural materials of fast biEeder reactors iE;r.d in
the first wall and blanket materials of fusion reactors
is i; r.<jor problem the.t faces the commercial use of
these reactors. Voids cause the materials to swell
which leads to density decrease and accordingly changes
in the r.ectanical properties of the material. This
needs essential design considerations such as a more
open, and hence less’economical core structure.
For the above. iEasons, this problem was studied in
this thesis. The origin of the problem was studied and
the solutions were recommended. An existing theoretical
model was improved. The initial void radius used in
this model was optionally taken to be the critical
r&dius . Tte model ended with two quadratic algebraic
equations which were solved simultaneously with four
coupled non-linear first-order differential equations.
Haming’s c orrector-predictor method.was used to solve
the non-linear differential equations and a computer
code, SWRAT, was developed to stud,
.~ this phenomena_
This code was caliberated and found to be acceptable.
Two versions of this code were d(veloped, the first is
applicable to main frames and waLz compiled, linked and