skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Support for HLW Direct Feed - Phase 2, VSL-15R3440-1

Abstract

This report describes work performed to develop and test new glass and feed formulations originating from a potential flow-sheet for the direct vitrification of High Level Waste (HLW) with minimal or no pretreatment. In the HLW direct feed option that is under consideration for early operations at the Hanford Tank Waste Treatment and Immobilization Plant (WTP), the pretreatment facility would be bypassed in order to support an earlier start-up of the vitrification facility. For HLW, this would mean that the ultrafiltration and caustic leaching operations that would otherwise have been performed in the pretreatment facility would either not be performed or would be replaced by an interim pretreatment function (in-tank leaching and settling, for example). These changes would likely affect glass formulations and waste loadings and have impacts on the downstream vitrification operations. Modification of the pretreatment process may result in: (i) Higher aluminum contents if caustic leaching is not performed; (ii) Higher chromium contents if oxidative leaching is not performed; (iii) A higher fraction of supernate in the HLW feed resulting from the lower efficiency of in-tank washing; and (iv) A higher water content due to the likely lower effectiveness of in-tank settling compared to ultrafiltration. The HLW directmore » feed option has also been proposed as a potential route for treating HLW streams that contain the highest concentrations of fast-settling plutoniumcontaining particles, thereby avoiding some of the potential issues associated with such particles in the WTP Pretreatment facility [1]. In response, the work presented herein focuses on the impacts of increased supernate and water content on wastes from one of the candidate source tanks for the direct feed option that is high in plutonium.« less

Authors:
 [1];  [1];  [2];  [1]
  1. The Catholic Univ. of America, Washington, DC (United States)
  2. EnergySolutions, Columbia, MD (United States)
Publication Date:
Research Org.:
Hanford Site (HNF), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Environmental Management (EM)
Contributing Org.:
Office of River Protection, The Catholic University of America, EnergySolutions
OSTI Identifier:
1347547
Report Number(s):
ORP-60672 Rev.0
VSL-15R3440-1
DOE Contract Number:  
AC27-08RV14800
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES

Citation Formats

Matlack, K. S., Pegg, I., Joseph, I., and Kot, W. K. Support for HLW Direct Feed - Phase 2, VSL-15R3440-1. United States: N. p., 2017. Web. doi:10.2172/1347547.
Matlack, K. S., Pegg, I., Joseph, I., & Kot, W. K. Support for HLW Direct Feed - Phase 2, VSL-15R3440-1. United States. doi:10.2172/1347547.
Matlack, K. S., Pegg, I., Joseph, I., and Kot, W. K. Mon . "Support for HLW Direct Feed - Phase 2, VSL-15R3440-1". United States. doi:10.2172/1347547. https://www.osti.gov/servlets/purl/1347547.
@article{osti_1347547,
title = {Support for HLW Direct Feed - Phase 2, VSL-15R3440-1},
author = {Matlack, K. S. and Pegg, I. and Joseph, I. and Kot, W. K.},
abstractNote = {This report describes work performed to develop and test new glass and feed formulations originating from a potential flow-sheet for the direct vitrification of High Level Waste (HLW) with minimal or no pretreatment. In the HLW direct feed option that is under consideration for early operations at the Hanford Tank Waste Treatment and Immobilization Plant (WTP), the pretreatment facility would be bypassed in order to support an earlier start-up of the vitrification facility. For HLW, this would mean that the ultrafiltration and caustic leaching operations that would otherwise have been performed in the pretreatment facility would either not be performed or would be replaced by an interim pretreatment function (in-tank leaching and settling, for example). These changes would likely affect glass formulations and waste loadings and have impacts on the downstream vitrification operations. Modification of the pretreatment process may result in: (i) Higher aluminum contents if caustic leaching is not performed; (ii) Higher chromium contents if oxidative leaching is not performed; (iii) A higher fraction of supernate in the HLW feed resulting from the lower efficiency of in-tank washing; and (iv) A higher water content due to the likely lower effectiveness of in-tank settling compared to ultrafiltration. The HLW direct feed option has also been proposed as a potential route for treating HLW streams that contain the highest concentrations of fast-settling plutoniumcontaining particles, thereby avoiding some of the potential issues associated with such particles in the WTP Pretreatment facility [1]. In response, the work presented herein focuses on the impacts of increased supernate and water content on wastes from one of the candidate source tanks for the direct feed option that is high in plutonium.},
doi = {10.2172/1347547},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 20 00:00:00 EDT 2017},
month = {Mon Mar 20 00:00:00 EDT 2017}
}

Technical Report:

Save / Share: