ORNL-2106 - the Molten Salt Energy Technologies Web Site

ANP PROJECT PROGRESS REPORT
86
4:)
5.37
4.67
4.21
4.1 1
3.98
3.82
3.72
3.56
3.52
3.44
3.3 1
3.22
3.12
3.1 1
3.07
3.01
2.95
2.571
2.482
2.356
2.243
2.164
2.111
2.088
2.060
2.025
2.004
1 e976
1.947
1.909
1 a861
1.812
1.727
1 a638
1 e591
I/$
30
9
37
10
15
22
30
5
11
100
8
30
63
100
5
20
6
10
8
8
8
10
15
15
33
30
8
7
28
18
85
6
10
10
10
THE SYSTEM NoF-RbF-ZrF4-UF4 w
H. A. Friedman H.. Davis7
I
Two areas of the quaternary system NaF-RbF-
ZrF,-UF, offer mixtures which may be suitable
fuels for circulating-fuel reactors. Solvents with
approximately 10 mole % NaF, 52 mole % RbF,
and 38 mole % ZrF, with the addition of 4 mole %
UF, give a fuel with a liquidus temperature of
approximately 500°C. With the addition of 7 mole
% UF, a fuel with a liquidus temperature of approximately
545°C is obtained. These fuel
mixtures have RbF-UF, or RbF*3UF4 as the
primary phase. No serious segregation of the
uranium phase has been evident in the experi-
,
mental work. These mixtures are not optimal
choices for the fuel mixture because the uranium
phase contains a high concentration of UF, and
there is a large difference between the temperatures
at which the uranium phase and the primary
phase of the solvent separate.
Solvents with approximately 35 mole 96 NaF,
25 mole % RbF, and 40 mole % ZrF, with the
f
addition of 4 mole % UF, give a fuel with a
liquidus temperature of approximately 480%.
With the addition of 7 mole % UF, a fuel with a
liquidus temperature of approximately 51 O°C is
obtained. At both UF, levels the uranium is contained
entirely in the solid solution 7NaF.6Zr(U)F4.
Mixtures of this general type should have physical
’
properties and corrosion characteristics that
would make them of definite interest as fuels.
THE SYSTEM NaF-LiF-BeF,
R. E. Meadows
Quenching studies of the system NaF-LiF-BeF,
were continued, and it is now possible to present
a diagram (Fig. 2.1.6) of the triangle having LiF,
NaF, and NaF-BeF, at the apexes. Work on the
other portion of the system is under way, Petrographic
identification of phases in this system is
very difficult, because several of the compounds
have nearly the same indices of refraction and are
isotropic, or nearly so. As a result reliance was
placed on identification by means of x-ray diffraction
patterns; even this identification is
70n assignment from Pratt & Whitney Aircraft.