Engineering topics

Brewer, Roger W.

Publications and source records attributed to Brewer, Roger W..

3 records

DOE OSTI2015

The final JEZEBEL evaluation? - 14440

A reevaluation of the {sup 239}Pu Jezebel experiment of 1954-1955 was published in the 2013 edition of the International Criticality Safety Benchmark Evaluation Project (ICSBEP) Handbook. Four high-fidelity benchmark models were included, but assumptions had to be made about the distribution of the mass among the Pu-ally parts. Since then, historic documents have been found that give the as-built Pu-alloy part masses, mass densities, and some dimensions. These quantities are not consistent, and to reconcile them we have retained the masses and densities but varied the dimensions. The final average calculated-to-experiment k{sub eff} of the four detailed models is only 0.00001 greater than in the 2013 reevaluation, and the experimental uncertainty is 0.00017 less. This reevaluation has not yet received an independent external review or approval by the ICSBEP Working Group. (authors)

42 ENGINEERING↗

DOE OSTI2013

MCNP6 Dose Calculations for the Carousel in the LDRGIF

All calculated results are satisfactory. The 66% confidence intervals for all results are less than 5%. A comparison was made between a simple model and a detailed model. The simple model consists of the source, room walt the carousel AI disks, sample cans, and the samples. The detailed model includes the entire simple model along with the safe, and all of the details of the carousel. There was no difference between the two models for the dose absorbed by the samples. If these calculations are performed in the future, one should use the simple model. The simple model runs faster and the results are easier to understand. Dose rates to various polymers in the carousel assembly were calculated. The source of radiation is a 6.61 curie 137 Cs source. The experiments are planned for Bldg 6631. LK3626 absorbed the largest dose, 791000±554 rads/yr. The lowest absorbed dose is 696000±487 rads/yr. The lowest absorbed dose is for the gold disk #1 and TLDs 1a and 1b, Au disk 658000±3950 rads/yr and TLD 1a 481000±4450 rads/yr. The Au disk with the highest absorbed dose is #3 at 3640000±9460 rads/yr. The TLD with the highest absorbed dose is 6a at 1820000±106 rads/yr.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗

DOE OSTI2013

Spectral Data from Multiplying Assemblies

In this report we focus on the data obtained from various assemblies using fissionable materials. These assemblies have gamma and neutron spectral data at delayed critical (DC), prompt critical (PC), and subcritical for various assemblies that use fissile and/or fissionable material as the primary source of radiation. There are a few categories of data that have been measured. The data was measured using many types of detectors. The data may have been differential fluxes, integral fluxes, or currents. Unfortunately some of these assemblies may not have data in an easily accessible format, or we do not have a model suitable for calculations. All have to be examined in more detail to determine which meet acceptability and applicability criteria.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗