Gas-Cooled Reactor Project Semiannual Progress Report: September 1963 Page: 17
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17
independent means for varying the reactivity of the core so that period
measurements may be made near critical. In a gas-cooled reactor a con-
venient means for obtaining this variation is by pressurizing the reactor
with a gaseous poison, such as air or nitrogen. For assessing the hazards
involved in this operation, calculations were performed to determine the
reactivity variations which would result from both single-ended and double-
ended ruptures of the inlet coolant ducts. If the rupture occurs when
the core is pressurized to 20 atm, the multiplication factor will increase
to k = 1.0464 for the release of air and to k = 1.0593 for the re-
eff eff
lease of nitrogen. It was assumed in the calculations that all voids
were filled, including those which reduce the actual graphite density to
a value below that of a perfect crystal. The time dependence of the
change in multiplication was calculated for both air and nitrogen, using
depressurization rates calculated by J. T. Lence,11 and the results are
given in Figs. 1.6 and 1.7. Studies are currently under way to determine
11J. T. Lence, Tennessee Valley Authority, personal communication
to J. I. Paulk.
UNCLASSIFIED
ORNL-DWG 63-5957
1.05
keff = 4.0464
DOUBLE-ENDED COLD-LEG RUPTURE
1.04
1.03
SINGLE-ENDED COLD-LEG RUPTURE
1.02
1.01
1.00
0 2 4 6 8 10 42
TIME (sec)
Fig. 1.6. Variation of Multiplication Factor with Time Following a
Rupture of the Primary System When Pressurized with 20 atm of Air.
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Oak Ridge National Laboratory. Gas-Cooled Reactor Project Semiannual Progress Report: September 1963, report, January 29, 1964; Oak Ridge, Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc100339/m1/53/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.