ORNL-2106 - the Molten Salt Energy Technologies Web Site

ANP PROJECT PROCRESS REPORT
1 2 5 10 2 5 102 2 5
TIME (sec)
EeoRH
ORNL-LR-DWG (4919
2 5 io4
Fig. 1.2.4. Power Density in the Off-Gas Line as a Function of Time and Gas Volume in the Ex-
pansion Tank for a Fuel Flow Rate of 22 gpm.
The activities to be expected at shutdown and
100 and 300 days after shutdown for reactor oper-
ating periods of 500 and lo00 hr at 60 Mw are
presented in Table 1.2.3, which also gives the
average beta-ray energies, the gamma-ray energies,
and the gamma-ray yields in photons per 100
disintegrations. It has been assumed that, at
shutdown, the fuel is dumped instantaneously SO
that no more plating takes place. Also, the
activities of RhlOBm and Rh106 are zero at shut-
38
down, since these nuclides are carried away with
the fuel and have a chance to build up only when
their precursors decay.
The gamma activity at 100 days after shutdown
for 500 hr of operation at 60 Mw is approximately
2 x 105 curies, and at 300 days after shutdown,
for the same operating conditions, it is about
8 x IO3 curies. These high activities at times
long after shutdown must be contended with in
any disassembly procedure suggested for the ART.
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