STF simulation with PARKA and application to diagnostic instrumentation evaluation Page: 2 of 14

STF SIMULATION WITH PARKA AND APPLICATION TO
DIAGNOSTIC INSTRUMENTATION EVALUATION*
J. D. Orndoff and A. E. Evans
Los Alamos Scientific Laboratory
Los Alamos, New Mexico 87545 U.S.A.
ABSTRACT
The PARKA critical assembly at LASL has been modified
to serve as a driver for an array of 37 enriched UO2fuel pins.
Utilizing good simulation of typical STF conditions, fuel
motion diagnostic methods will be evaluated at low power for
multipin assemblies. Initial experiments are to establish
the capability of the neutron hodoscope and in-core detec-
tors. Preliminary results are reported for the latter tech-
nique.
SUMMARY
The PARKA critical assembly at LASL has been modified
to serve as a driver for an array of 37 highly enriched U02
fuel pins representing fast reactor fuel. PARKA is a Rover
Project Kiwi reactor loaded-with graphite-uranium fuel elements.
These are one-hole bead loaded elements that were used for
critical assembly studies for Rover reactor design. Four en-
riched uranium loadings of 100, 200, 300, and 400 kg/m3 are
distributed to give approximately flat fission density across
the 0.89-m fueled diameter. Figure 1 is a photograph of the
PARKA core with a 37 fuel-pin array at the center.
Onetran transport code calculations have been run for
the 37 pin array at the center of PARKA and also for the case
of a central subassembly (217 pins) surrounded by six half
subassemblies. The 37 pin array calculations had Na, H20, or
void in the region between fuel pins. Water was included since
its density is the same as Na and its moderating properties
*This work is funded by the Nuclear Regulatory Commission.

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Orndoff, J. D. & Evans, A. E. STF simulation with PARKA and application to diagnostic instrumentation evaluation, article, January 1, 1976; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1445485/m1/2/ocr/: accessed June 16, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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