Proposal for an Advanced Engineering Test Reactor : ETR II Page: 5
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PROPOSAL FOR AN ADVANCED ENGINEERING TEST REACTOR - ETR II
This report presents the results of a study which was directed at
providing additional experimental loop irradiation space for the AEC-DRD
testing program. It was a premise that the experiments allocated to this
reactor were those that could not be accommodated in the MTR, ETR or in
existing commercial test reactors.
To accomplish the design objectives called for a reactor producing
perturbed neutron fluxes exceeding 1015 thermal neutrons per square centi-
meter per second and 1.5 x 1015 epithermal neutrons per square centimeter
per second. To accommodate the experimental samples, the reactor fuel
core is four feet long in the direction of experimental loops. This is
twice the length of the MTR core and a third longer than the ETR core.
The reactor concept herein proposed represents an advance in test re-
actor technology and can be expected to contribute a substantial body of
information to reactor development as has been the case with the MTR and ETR.
The vertical arrangement of reactor and experiments permits the use of
straight and vertical loops penetrating the top cap of the reactor vessel.
The design offers a high degree of accessibility of the exterior portions
of the experiments and offers very convenient handling and discharge of
experiments. Since the loops are to be integrated into the reactor design
and the in-pile portions installed before reactor startup, it is felt that
many of the problems encountered in MTR and ETR experience will cease to
exist. Installation of the loops prior to startup will have an added ad-
vantage in that the flux variations experienced in experiments in ETR
every time a new loop is installed will be absent.
ETR II (formerly called ETR IV) has a core configuration which
provides essentially nine flux-trap regions in a geometry which is almost
optimum for cylindrical experiments. The geometry is similar to that of
a four-leaf clover with one flux trap in each leaf, one at the inter-
section of the leaves, and one between each pair of leaves. The nominal
power level is 250 megawatts.
This study was carried out in enough detail to permit the establish-
ment of the design parameters and to develop the power requirement which,
conservatively rated, will definitely reach the flux specifications. A
critical mockup of an arrangement similar to ETR II was loaded into the
Engineering Test Reactor Critical Facility. A two-dimensional calculation
of this actual test provided a confirmation of validity of these computer
techniques in predicting the behavior of this reactor.
The study of the remainder of the plant layout and the engineering
performance of the plant incorporated the large body of test reactor ex-
perience developed at the MTR and ETR site. This design contemplates an
integrated, self-sufficient site, including all service facilities
required for the operation and maintenance of the reactor and experiments.
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deBoisblanc, D. R. Proposal for an Advanced Engineering Test Reactor : ETR II, report, March 17, 1960; [Idaho Falls, Idaho]. (https://digital.library.unt.edu/ark:/67531/metadc67288/m1/5/: accessed May 27, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.