Criticality Safety Evaluation of a LLNL Training Assembly for Criticality Safety (TACS) Page: 3 of 33
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Hands-on experimental training in the physical behavior of multiplying systems is
one of ten key areas of training required for practitioners to become qualified in
the discipline of criticality safety as identified in DOE-STD-1135-99, Guidance for
Nuclear Criticality Safety Engineer Training and Qualification.
This document is a criticality safety evaluation of the training activities (or
operations) associated with HS-3200, Laboratory Class for Criticality Safety.
These activities utilize the Training Assembly for Criticality Safety (TACS).
The original intent of HS-3200 was to provide LLNL fissile material handlers with
a practical hands-on experience as a supplement to the academic training they
receive biennially in HS-3100, Fundamentals of Criticality Safety, as required by
ANSI/ANS-8.20-1991, Nuclear Criticality Safety Training.
HS-3200 is to be enhanced to also address the training needs of nuclear
criticality safety professionals under the auspices of the NNSA Nuclear Criticality
This document is provided in response to a Livermore Site Office2 (previously a
part of the DOE Oakland Operations Office) identified need for a new criticality
safety evaluation to revise and supercede the preliminary study3 by Koponen.
This document satisfies the format and content requirements of DOE-STD-3007-
93, Change Notice No. 1, Guidelines for Preparing Criticality Safety Evaluations
at Department of Energy Non-Reactor Nuclear Facilities. The document also
satisfies additional LLNL content requirements specified in CSG-P-004, Rev. 3,
Criticality Safety Evaluations.
1 David H. Crandall, letter to A. J. Eggenberger, February 8, 2006.
2 Carol Sohn, letter to Alan Copeland, Subject: USQ 334-98-02, "Training Assembly for Criticality
Safety (TACS) Use in B334", June 17, 1999.
3 CSM-279, Preliminary Criticality Study for Criticality Training Assembly, CSM-279, Brian
Koponen, Lawrence Livermore National Laboratory, April 19, 1977.
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Heinrichs, D P. Criticality Safety Evaluation of a LLNL Training Assembly for Criticality Safety (TACS), report, June 26, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc883517/m1/3/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.