ZPPR-20 phase D : a cylindrical assembly of polyethylene moderated U metal reflected by beryllium oxide and polyethylene.

Abstract

SP-100 fuel type, was not available. ZPPR Assembly 20D was designed to simulate a water immersion accident. The water was simulated by polyethylene (CH 2 ), which contains a similar amount of hydrogen and has a similar density. NEA/NSC/DOC(95)03/II Volume II HEU-MET-MIXED-012

Status report on multigroup cross section generation code development for high-fidelity deterministic neutronics simulation system.

“…For initial verification and validation of the ENDF/B-VII.0 libraries of MC 2 -2, a set of fast critical benchmark problems were analyzed, including eight LANL fast critical assemblies [7], two ANL ZPR fast critical assembles [7], and six ZPPR-21 critical assemblies [8][9][10]. The TWODANT [38] calculations were performed with the multigroup cross section sets obtained from MC 2 -2 calculations.…”

“…Preliminary tests of the ENDF/B-VII.0 libraries of MC 2 -2 have also been performed using a set of fast critical benchmark problems, including eight LANL fast critical assemblies [7], two ANL ZPR fast critical assembles [7], and six ZPPR-21 critical assemblies [8][9][10]. …”

A Validation Study of Existing Neutronics Tools against ZPPR-21 and ZPPR-15 Critical Experiments

“…Based on Monte Carlo analyses with the VIM code [4], criticality benchmark problems were previously developed for the ZPPR-21 critical experiments phases A through F [5][6][7]. These benchmark problems are specified in RZ geometry with region-averaged compositions.…”