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Title: Development of backfill material as an engineered barrier in the waste package system- Interim topical report

Abstract

A backfill barrier, emplaced between the containerized waste and the host rock, can both protect the other engineered barriers and act as a primary barrier to the release of radionuclides from the waste package. Attributes that a backfill should provide in order to carry out its required function have been identified. Primary attributes are those that have a direct effect upon the release and transport of radionuclides from the waste package. Supportive attributes do not directly affect radionuclide release but are necessary to support the primary attributes. The primary attributes, in order of importance, are: minimize (retard or exclude) the migration of ground water between the host rock and the waste canister system; retard the migration of selected chemical species (corrosive species and radionuclides) in the ground water; control the Eh and pH of the ground water within the waste-package environment. The supportive attributes are: self-seal any cracks or discontinuities in the backfill or interfacing host geology; retain performance properties at all repository temperatures; retain peformance properties during and after receiving repository levels of gamma radiation; conduct heat from the canister system to the host geology; retain mechanical properties and provide resistance to applied mechanical forces; retain morphological stability andmore » compatibility with structural barriers and with the host geology for required period of time. Screening and selection of candidate backfill materials has resulted in a preliminary list of materials for testing. Primary emphasis has been placed on sodium and calcium bentonites and zeolites used in conjunction with quartz sand or crushed host rock. Preliminary laboratory studies have concentrated on permeability, sorption, swelling pressure, and compaction properties of candidate backfill materials.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest Lab., Richland, WA (USA)
OSTI Identifier:
5839515
Report Number(s):
PNL-3873
ON: DE82000937; TRN: 82-001606
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 36 MATERIALS SCIENCE; RADIOACTIVE WASTE DISPOSAL; BACKFILLING; ENGINEERED SAFETY SYSTEMS; BENTONITE; COMPARATIVE EVALUATIONS; GEOLOGIC DEPOSITS; GROUND WATER; PERMEABILITY; PH VALUE; QUARTZ; RADIONUCLIDE MIGRATION; ROCKS; SORPTIVE PROPERTIES; SWELLING; TESTING; UNDERGROUND DISPOSAL; ZEOLITES; CHALCOGENIDES; ENVIRONMENTAL TRANSPORT; HYDROGEN COMPOUNDS; INORGANIC ION EXCHANGERS; ION EXCHANGE MATERIALS; MANAGEMENT; MASS TRANSFER; MATERIALS; MINERALS; OXIDES; OXYGEN COMPOUNDS; SILICON COMPOUNDS; SILICON OXIDES; SURFACE PROPERTIES; WASTE DISPOSAL; WASTE MANAGEMENT; WATER; 052002* - Nuclear Fuels- Waste Disposal & Storage; 360603 - Materials- Properties

Citation Formats

Wheelwright, E J, Hodges, F N, Bray, L A, Westsik, Jr, J H, Lester, D H, Nakai, T L, Spaeth, M E, and Stula, R T. Development of backfill material as an engineered barrier in the waste package system- Interim topical report. United States: N. p., 1981. Web. doi:10.2172/5839515.
Wheelwright, E J, Hodges, F N, Bray, L A, Westsik, Jr, J H, Lester, D H, Nakai, T L, Spaeth, M E, & Stula, R T. Development of backfill material as an engineered barrier in the waste package system- Interim topical report. United States. doi:10.2172/5839515.
Wheelwright, E J, Hodges, F N, Bray, L A, Westsik, Jr, J H, Lester, D H, Nakai, T L, Spaeth, M E, and Stula, R T. Tue . "Development of backfill material as an engineered barrier in the waste package system- Interim topical report". United States. doi:10.2172/5839515. https://www.osti.gov/servlets/purl/5839515.
@article{osti_5839515,
title = {Development of backfill material as an engineered barrier in the waste package system- Interim topical report},
author = {Wheelwright, E J and Hodges, F N and Bray, L A and Westsik, Jr, J H and Lester, D H and Nakai, T L and Spaeth, M E and Stula, R T},
abstractNote = {A backfill barrier, emplaced between the containerized waste and the host rock, can both protect the other engineered barriers and act as a primary barrier to the release of radionuclides from the waste package. Attributes that a backfill should provide in order to carry out its required function have been identified. Primary attributes are those that have a direct effect upon the release and transport of radionuclides from the waste package. Supportive attributes do not directly affect radionuclide release but are necessary to support the primary attributes. The primary attributes, in order of importance, are: minimize (retard or exclude) the migration of ground water between the host rock and the waste canister system; retard the migration of selected chemical species (corrosive species and radionuclides) in the ground water; control the Eh and pH of the ground water within the waste-package environment. The supportive attributes are: self-seal any cracks or discontinuities in the backfill or interfacing host geology; retain performance properties at all repository temperatures; retain peformance properties during and after receiving repository levels of gamma radiation; conduct heat from the canister system to the host geology; retain mechanical properties and provide resistance to applied mechanical forces; retain morphological stability and compatibility with structural barriers and with the host geology for required period of time. Screening and selection of candidate backfill materials has resulted in a preliminary list of materials for testing. Primary emphasis has been placed on sodium and calcium bentonites and zeolites used in conjunction with quartz sand or crushed host rock. Preliminary laboratory studies have concentrated on permeability, sorption, swelling pressure, and compaction properties of candidate backfill materials.},
doi = {10.2172/5839515},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {9}
}