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ANP PROJECT PROGRESS REPORT
RADIATION HEATING ON THE ART
EQUATORIAL PLANE IN THE VICINITY
OF THE FUEL-TO-NaK HEAT EXCHANGER
H. W. Bertini
The results of calculations of the radiation
heating on the ART equatorial plane in the outer
3 cm of the beryllium reflector and in the Inconel
and the boron-containing shells on both sides of
the fuel-to-NaK heat exchanger are presented in
Figs. 1.2.1 and 1.2.2. The total gamma-ray
heating in each region is given in Fig. 1.2.1,
as well as the heating from the sources which
are the main contributors to the total in each
28
Source
No.
1*
2
3
4
5
6
7
8
9
10
11
12
13
14
1.2. ART PHYSICS
A. M. Perry
shell. The encircled numbers on Fig. 1.2.1 refer
to the sources described in Table 1.2.1.
The data on heating in the copper-boron layer
by alpha particles from the B10(n,u)Li7 reaction
are plotted in Fig. 1.2.2. The heating goes to
infinity at the face of the layer closest to the
core because the heating at various points is
governed by an E, function,
where h is the mean free path. The integral under
the curve will be finite.
TABLE 1.2.1. SOURCES OF RADIATION HEATING CONSIDERED IN CALCULATING
THE RESULTS PRESENTED IN FIG. 1.2.1
Source
Prompt gamma rays in the fuel region of the core of the
reactor
Decay gamma rays in the fuel region of the core of the
reactor
Gamma rays from inelastic scattering of neutrons in the
fuel region of the core
Capture gamma rays in the outer core shell
Capture gamma rays in the reflector (average)
Capture gamma rays in first Inconel shell outside of
beryl1 ium reflector
Boron capture gamma rays in copper-boron layer
Alpha particles from the B1O(np)Li7 reaction in the
copper-boron layer (average)
Decay gamma radiation from the fuel in the heat exchanger
Gamma rays from inelastic scattering of neutrons in first
9 cm of reflector (average)
Capture gamma rays from delayed neutrons in the heat exchanger
and Inconel shells (including the pressure shell)
Capture gamma rays in the copper of the capper-boron layer
Gamma rays from inelastic scattering in both core shells
Capture gamma rays in the island core shell
*In Fig. 1.2.1 the data for heating from sources I, 2, 3 are combined and labeled a.
Source Strength
28.3 w/cm3
6.84 w/cm3
10.1 w/cm3
41.4 w/cm2
-0.5 w/cm3
22.5 w/cm3
1.8 w/cm2
42 w/cm3
2.3 w/cm3
0.7 w/cm3
~0.1 w/cm’
OS w/cm2
-4 w/cm2
41.4 w/cm2
cs
e
.