U to Pu just after separation. Addition of
238 U results in
239 Pu production and
generally is undesirable for Pu transmutation. Table 19.3 lists two compositions.
Other conditions are similar to the MA-ADS.
19.3.3 Result of One-Batch Core
The reference ADS for MA transmutation is designed with a one-batch core, which
means that all the fuel is loaded and unloaded simultaneously. At first, this
one-batch design was adopted to Pu transmuters. Table 19.4 lists the in-core and
out-core time with operation efficiency. Out-core time of the ADSs is 3 years,
which allows decay of
244 Cm. In-core time of the reference MA-ADS is 2 years,
although that of Pu-ADS is reduced to 1 year because the decrease of criticality is
Fig. 19.2 R-Z model of
accelerator-driven system
(ADS)
Table 19.4 Efficiencies
of ADSs
ADS case
MA (Ref.)
Pu
Pu+U
T i (years)
2
1
2
T o (years)
3
3
3
ε o (%)
82.1
82.1
82.1
ε c (%)
40.0
25.0
40.0
212
K. Nishihara et al.