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Table 5.4. Blanket Heat Exchanger Specifications
Number required
Rate of heat transfer, Nw
Eate of heat transfer, Btu/hr
Shell side
Hot fluid or cold fluid
Entrance temperature, OF
Exit temperature, OF
Entrance pressure, a psi
Exit pressure,a psi
Ai’ across exchanger, psi
Mass flow rate, Ib/h
Tube side
Not fluid or cold fluid
Entrsnce temperature, “F
Exit temperature, OF
Entrance pressure,” psi
Exit pressure,a psi
i\P across exchanger, psi
Mass flow rate, Ib/hr
Velocity, fps
Tube material
Tube OD, in.
Tube thickness, in.
Tube length, tube sheet to
tube sheet, ft
Shell materiel
Shell thickness, in.
Shell ID, in.
Tube sheet material
Tiibe sheet thickness, in.
Number of tubes
Inner annulus
Outer annulus
1
Pitch of tubes, in.
Total heat transfer area, ft2
Basis for area calculation
Type of baffle
Number of baffles
Rafkle spacing, in.
Disk OD, in.
Doughnut ID, in.
Overall heat transfer coef-
ficient, U, &tu hr-’ ft-2
aIncludes pressure due to gravity head.
bPressnre loss due to friction only.
4
27.8
9.47 107
Cold
(coolant salt)
1110
1125
138
129
15
1.63 x 10’
Hot
(blanket salt)
1250
1150
111
20
91
4.3 x 106
10.5
Hastelloy N
0.375
0.035
8.3
Hastelloy N
0.50
55
Hastelloy N
1
83 4
822
0.8125,
triarigiilar
1318
Tube OD
Disk and
doughnut
4
19.8
33.6
31.8
1030
79
5.6 FUEL DRAIN TANKS
H. L. Watts T. W. Pickel
Two 60-iti.-diam by 20-ft -high dump tanks are
required for draining the fuel salt from each of the
reactor systems. These ate shown in Fig. 5.13.
One drain tank is connected to the 5-in.-diam
overflow connection on the sump tank of the fuel
circulating pump and receives all tht3 salt from
the reactor when it is drained. The drain time
is estimated to be short, probably less than 10
sec, and this method could be used for emergency
shutdown if necessary. The other drain tank is
connected to the fuel heat exchanger and fills
through a siphon action due to the differences in
elcvat i on.
The maximum heat to be removed in each fuel
drain tank is 12 Mw (thermal). The two tanks are
cooled by a total of 422,000 lt)/hr of steam taken
from the high-pressure turbine-generator exhaust
at about 550 psia. ‘The steam is heated from G O O F
to about 1000OF in vertical thimblcs spaced on 3-
in. centers in each dump tank. There are 271 of
these thimbles per tank, extending to within 1 in.
of the hot tom. The reentrant -type steam thimbles
are inserted in 2-in.-OD INOR-8 thimbles which
contact the fuel salt, the 0.025-in. radial clearance
between the two thimbles being filled with stag-
nant inert fuel salt to serve as a heat transfer
medium. The double thimble arrangement provides
the necessary double barrier between the steam
and the enriched fuel salt. Steam leaves the
thimbles at about 72 fps and enters the steam
chest at the top of the dump tank.
5.7 BLANKET AND COOLANT SALT
DRAIN TANKS
H. L. Watts W. C. George
The drain tanks for the blanket salt and for the
secondary coolant salt are essentially simple
storage reservoirs. Cooling systems such as
those used in the fuel salt tanks are not required.
‘The details of the designs for these tanks have
not been completed. The location of the tanks
in the cells is shown in Fig. 5.3.