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Title: Oxidative Tritium Decontamination System

Abstract

The Princeton Plasma Physics Laboratory, Tritium Systems Group has developed and fabricated an Oxidative Tritium Decontamination System (OTDS), which is designed to reduce tritium surface contamination on various components and items. The system is configured to introduce gaseous ozone into a reaction chamber containing tritiated items that require a reduction in tritium surface contamination. Tritium surface contamination (on components and items in the reaction chamber) is removed by chemically reacting elemental tritium to tritium oxide via oxidation, while purging the reaction chamber effluent to a gas holding tank or negative pressure HVAC system. Implementing specific concentrations of ozone along with catalytic parameters, the system is able to significantly reduce surface tritium contamination on an assortment of expendable and non-expendable items. This paper will present the results of various experimentation involving employment of this system.

Authors:
; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
796125
Report Number(s):
PPPL-3671.pdf
TRN: US0201454
DOE Contract Number:
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 11 Feb 2002
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONTAMINATION; DECONTAMINATION; EMPLOYMENT; HVAC SYSTEMS; OXIDATION; OZONE; PHYSICS; PLASMA; SURFACE CONTAMINATION; TANKS; TRITIUM; TRITIUM OXIDES

Citation Formats

Charles A. Gentile, John J. Parker, Gregory L. Guttadora, and Lloyd P. Ciebiera. Oxidative Tritium Decontamination System. United States: N. p., 2002. Web. doi:10.2172/796125.
Charles A. Gentile, John J. Parker, Gregory L. Guttadora, & Lloyd P. Ciebiera. Oxidative Tritium Decontamination System. United States. doi:10.2172/796125.
Charles A. Gentile, John J. Parker, Gregory L. Guttadora, and Lloyd P. Ciebiera. Mon . "Oxidative Tritium Decontamination System". United States. doi:10.2172/796125. https://www.osti.gov/servlets/purl/796125.
@article{osti_796125,
title = {Oxidative Tritium Decontamination System},
author = {Charles A. Gentile and John J. Parker and Gregory L. Guttadora and Lloyd P. Ciebiera},
abstractNote = {The Princeton Plasma Physics Laboratory, Tritium Systems Group has developed and fabricated an Oxidative Tritium Decontamination System (OTDS), which is designed to reduce tritium surface contamination on various components and items. The system is configured to introduce gaseous ozone into a reaction chamber containing tritiated items that require a reduction in tritium surface contamination. Tritium surface contamination (on components and items in the reaction chamber) is removed by chemically reacting elemental tritium to tritium oxide via oxidation, while purging the reaction chamber effluent to a gas holding tank or negative pressure HVAC system. Implementing specific concentrations of ozone along with catalytic parameters, the system is able to significantly reduce surface tritium contamination on an assortment of expendable and non-expendable items. This paper will present the results of various experimentation involving employment of this system.},
doi = {10.2172/796125},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Feb 11 00:00:00 EST 2002},
month = {Mon Feb 11 00:00:00 EST 2002}
}

Technical Report:

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  • Almost all tritium decontamination systems proposed for fusion facilities employ catalytic oxidation to water, followed by drying, to remove tritium and tritiated hydrocarbons from gas streams. One such large-scale system, the gas purification system (GPS), has been operating in the Tritium Research Laboratory (TRL) at Sandia National Laboratories, Livermore, CA, since October 1977. A series of experiments have recently been conducted there to assess the current operating characteristics of the GPS catalyst. The experiments used tritium and tritiated methane and covered a range of temperatures, flow rates, and concentration levels. When contrasted with 1977 data, the results indicate that nomore » measurable degradation of catalyst function had occurred. However, some reduction in active metal surface area, as indicated by B.E.T. surface area measurements (approx. 100 ..-->.. 90 m/sup 2//g) and AES scans (approx. 1.4 ..-->.. 0.9 at% Pt), had occurred. Kinetic rate coefficients were also derived and a rough temperature dependence obtained.« less
  • The Oxidative Tritium Decontamination System, OTDS, provides a method and apparatus for reduction of tritium surface contamination on various items. The OTDS employs ozone gas as oxidizing agent to convert elemental tritium to tritium oxide. Tritium oxide vapor and excess ozone gas is purged from the OTDS, for discharge to atmosphere or transport to further process. An effluent stream is subjected to a catalytic process for the decomposition of excess ozone to diatomic oxygen. One of two configurations of the OTDS is employed: dynamic apparatus equipped with agitation mechanism and large volumetric capacity for decontamination of light items, or staticmore » apparatus equipped with pressurization and evacuation capability for decontamination of heavier, delicate, and/or valuable items.« less
  • The tritium effluent control project to reduce emissions at Mound Laboratory and its application to liquid wastes are described. Research progress reported includes increasing the power of the Nd:YAG laser for detritiating voluminous wastes by molecular photoexcitation, and analysis of gas produced from tritiated water and octane. (DLC)
  • The Princeton Plasma Physics Laboratory has developed a process by which to significantly reduce surface and near surface tritium contamination from various materials. The Oxidative Tritium Decontamination System (OTDS) reacts gaseous state ozone (accelerated by presence of catalyst), with tritium entrained/deposited on the surface of components (stainless steel, copper, plastics, ceramics, etc.), for the purpose of activity reduction by means of oxidation-reduction chemistry. In addition to removing surface and near surface tritium contamination from (high monetary value) components for reuse in non-tritium environments, the OTDS has the capability of removing tritium from the surfaces of expendable items, which can thenmore » be disposed of in a less expensive fashion. The OTDS can be operated in a batch mode by which up to approximately 40 pounds of tritium contaminated (expendable) items can be processed and decontaminated to levels permissible for free release (less than1,000 dpm/100 cm 2). This paper will discuss the OTDS process, the level of tritium surface contamination removed from various materials, and a technique for ''deep scrubbing'' tritium from subsurface layers.« less