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Title: Simulation of the Prompt Dose Environment in the National Ignition Facility during High Yield Shots

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1366914
Report Number(s):
LLNL-CONF-731987
DOE Contract Number:
AC52-07NA27344
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Simulation of the Prompt Dose Environment in the NIF during High Yield Shots, San Francisco, CA, United States, Jun 11 - Jun 15, 2017
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOCIMETRY

Citation Formats

Khater, H Y, and Brereton, S. Simulation of the Prompt Dose Environment in the National Ignition Facility during High Yield Shots. United States: N. p., 2017. Web.
Khater, H Y, & Brereton, S. Simulation of the Prompt Dose Environment in the National Ignition Facility during High Yield Shots. United States.
Khater, H Y, and Brereton, S. Thu . "Simulation of the Prompt Dose Environment in the National Ignition Facility during High Yield Shots". United States. doi:. https://www.osti.gov/servlets/purl/1366914.
@article{osti_1366914,
title = {Simulation of the Prompt Dose Environment in the National Ignition Facility during High Yield Shots},
author = {Khater, H Y and Brereton, S},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu May 18 00:00:00 EDT 2017},
month = {Thu May 18 00:00:00 EDT 2017}
}

Conference:
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  • Evaluation of the prompt dose environment expected in the National Ignition Facility (NIF) during Deuterium-Deuterium (D-D) and Tritium-Hydrogen-Deuterium (THD) shots have been completed. D-D shots resulting in the production of an annual fusion yield of up to 2.4 kJ (200 shots with 10{sup 13} neutrons per shot) are considered. During the THD shot campaign, shots generating a total of 2 x 10{sup 14} neutrons per shot are also planned. Monte Carlo simulations have been performed to estimate prompt dose values inside the facility as well as at different locations outside the facility shield walls. The Target Chamber shielding, along withmore » Target Bay and Switchyard walls, roofs, and shield doors (when needed) will reduce dose levels in occupied areas to acceptable values during these shot campaigns. The calculated dose values inside occupied areas are small, estimated at 25 and 85 {micro}rem per shot during the D-D and THD shots, respectively. Dose values outside the facility are insignificant. The nearest building to the NIF facility where co-located workers may reside is at a distance of about 100 m from the Target Chamber Center (TCC). The dose in such a building is estimated at a fraction of a ?rem during a D-D or a THD shot. Dose at the nearest site boundary location (350 m from TCC), is caused by skyshine and to a lesser extent by direct radiation. The maximum off-site dose during any of the shots considered is less than 10 nano rem.« less
  • A detailed model of the Target Bay (TB) at the National Ignition Facility (NIF) has been developed to estimate the post-shot radiation environment inside the facility. The model includes large number of structures and diagnostic instruments present inside the TB. These structures and instruments are activated by the few nanosecond pulse of neutrons generated during a shot and the resultant gamma dose rates are estimated at various decay times following the shot. The results presented in this paper are based on a low-yield D-T shot of 10{sup 16} neutrons. General environment dose rates drop to below 3 mrem/h within threemore » hours following a shot with higher dose rates observed at contact with some of the components. Dose rate maps of the different TB levels were generated to aid in estimating worker stay-out times following a shot before entry is permitted into the TB.« less