Yankee Core Evaluation Program Quarterly Progress Report: April-June 1964 Page: 400.2
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The LASER program is written in FORTRAN IV. The overlay structure
includes 8 links and 9 tape drives are required. Preliminary results
show the program to be relatively fast. For instance a typical
THERMOS calculation in LASER is performed in somewhat over a minute,
compared to about 5 minutes for the FORTRAN II version of THERMOS.
The output from LASER has been made very comprehensive and includes
the following information: neutron flux data, including flux
distributions in space and energy, flux ratios and disadvantage
factors, and neutron temperatures; reaction rate data, include ing
isotopic reaction rates, thermal utilization factor, 625, 620, X28
and conversion ratios, multiplication factor, capture-to-fission
ratios and power generation data; average and effective cross sections.
In addition, pointwise (radial) and averaged isotopic composition data
are available in a form which permits direct comparison with experi-
mental data (for example, plutonium to uranium ratios). These results
will be compared with isotopic data obtained as part of the EYC program
as well as wit experimental data obtained during the Yankee Core
Follow ProgramL. In addition to the whole-pellet isotopic data
obtained under subtask EYC-352, isotopic data pertaining to radial
samples obtained by microdrilling two fuel pellets have been obtained.
The microdrilling technique is discussed under subtask EYC-233. These
data are now being evaluated. The radial isotopic data should provide
a stringent test of the depletion model incorporated in LASER and of
the ability of the program to make accurate predictions of the isotopic
composition of irradiated fuel. A comparison of LASER results with
existing models should then provide an evaluation of unit cell homog-
enization methods.
Preparation of a topical report describing the theoretical basis of
the calculations together with results and evaluations was initiated
during the current period.
1. C. G. Poncelet, "Analysis of the Reactivity Characteristics of
Yankee Core I," WCAP-6050 (1963).-.400.2 -
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Yankee Core Evaluation Program Quarterly Progress Report: April-June 1964, report, July 1964; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc784209/m1/82/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.