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Title: Document Release of CSAM 99-140 to DNFSB for Review, October 17, 2018

Abstract

The data sheet on HFE-7200 from 3M is included in attachment 2. Unfortunately, at this time, the Criticality Safety Group cannot allow the replacement of TCE by HFE-7200 for the reasons discussed below. The moderating and reflecting properties of HFE-7200 were compared to trichloroethylene (TCE) and water. The results of several calculations are presented in attachment 1 and indicate that water is a far superior moderator than either HFE-7200 or TCE, but HFE-7200 results in significantly higher reactivity than TCE. The criticality safety evaluation for machining (CSM1020) credited the usage of TCE and this material was included in the Monte Carlo calculations to determine the reactivity of the upset conditions. Unfortunately, since the results of these calculations are relatively high, it cannot be determined without significant re-evaluation whether the replacement of conservatisms were employed in CSM1020 to simplify the calculations, it is likely that a re-evaluation considering less conservative models would allow the approval of HFE-7200. The Criticality Safety Group will include HFE-7200 when the evaluation for machining is upgraded to higher mass limits (with shape control).

Authors:
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1480413
Report Number(s):
LLNL-TR-760084
948457
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
Health and safety, Chemistry - Inorganic, organic, physical and analytical chemistry, Nuclear science and engineering

Citation Formats

Scorby, John C. Document Release of CSAM 99-140 to DNFSB for Review, October 17, 2018. United States: N. p., 2018. Web. doi:10.2172/1480413.
Scorby, John C. Document Release of CSAM 99-140 to DNFSB for Review, October 17, 2018. United States. doi:10.2172/1480413.
Scorby, John C. Mon . "Document Release of CSAM 99-140 to DNFSB for Review, October 17, 2018". United States. doi:10.2172/1480413. https://www.osti.gov/servlets/purl/1480413.
@article{osti_1480413,
title = {Document Release of CSAM 99-140 to DNFSB for Review, October 17, 2018},
author = {Scorby, John C.},
abstractNote = {The data sheet on HFE-7200 from 3M is included in attachment 2. Unfortunately, at this time, the Criticality Safety Group cannot allow the replacement of TCE by HFE-7200 for the reasons discussed below. The moderating and reflecting properties of HFE-7200 were compared to trichloroethylene (TCE) and water. The results of several calculations are presented in attachment 1 and indicate that water is a far superior moderator than either HFE-7200 or TCE, but HFE-7200 results in significantly higher reactivity than TCE. The criticality safety evaluation for machining (CSM1020) credited the usage of TCE and this material was included in the Monte Carlo calculations to determine the reactivity of the upset conditions. Unfortunately, since the results of these calculations are relatively high, it cannot be determined without significant re-evaluation whether the replacement of conservatisms were employed in CSM1020 to simplify the calculations, it is likely that a re-evaluation considering less conservative models would allow the approval of HFE-7200. The Criticality Safety Group will include HFE-7200 when the evaluation for machining is upgraded to higher mass limits (with shape control).},
doi = {10.2172/1480413},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {10}
}