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Title: Chemical speciation of neptunium in spent fuel. Annual report for period 15 August 1999 to 15 August 2000

Abstract

(B204) This project will examine the chemical speciation of neptunium in spent nuclear fuel. The R&D fields covered by the project include waste host materials and actinide chemistry. Examination of neptunium is chosen since it was identified as a radionuclide of concern by the NERI workshop. Additionally, information on the chemical form of neptunium in spent fuel is lacking. The identification of the neptunium species in spent fuel would allow a greater scientific based understanding of its long-term fate and behavior in waste forms. Research to establish the application and development of X-ray synchrotrons radiation (XSR) techniques to determine the structure of aqueous, adsorbed, and solid actinide species of importance to nuclear considerations is being conducted at Argonne. These studies extend current efforts within the Chemical Technology Division at Argonne National Laboratory to investigate actinide speciation with more conventional spectroscopic and solids characterization (e.g. SEM, TEM, and XRD) methods. Our project will utilize all these techniques for determining neptunium speciation in spent fuel. We intend to determine the chemical species and oxidation state of neptunium in spent fuel and alteration phases. Different types of spent fuel will be examined. Once characterized, the chemical behavior of the identified neptunium species willmore » be evaluated if it is not present in the literature. Special attention will be given to the behavior of the neptunium species under typical repository near-field conditions (elevated temperature, high pH, varying Eh). This will permit a timely inclusion of project results into near-field geochemical models. Additionally, project results and methodologies have applications to neptunium in the environment, or treatment of neptunium containing waste. Another important aspect of this project is the close cooperation between a university and a national laboratory. The PI has a transuranic laboratory at MIT where students can perform spectroscopic and radiochemical experiments. Through the ANL partner, students can have additional experience performing research in a DOE setting. This will provide a unique and constructive opportunity for developing quality graduate students with experience and expertise in handling actinides. Our ability to produce experienced actinide scientists is currently restricted by the dearth of radiochemistry and nuclear research at universities. Regardless of all else, future researchers must be trained and educated if the United States is to maintain a leadership role in nuclear technology. This project provides such an opportunity.« less

Authors:
;
Publication Date:
Research Org.:
Office of Scientific and Technical Information, Oak Ridge, TN (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
765721
Report Number(s):
001
TRN: US0303961
DOE Contract Number:  
FG03-99SF21903
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Sep 2000
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 43 PARTICLE ACCELERATORS; ACTINIDES; ANL; CHEMISTRY; NEPTUNIUM; NUCLEAR FUELS; RADIATIONS; RADIOCHEMISTRY; RADIOISOTOPES; SPENT FUELS; SYNCHROTRONS; VALENCE; WASTE FORMS; WASTES; X-RAY DIFFRACTION

Citation Formats

Ken Czerwinski, and Don Reed. Chemical speciation of neptunium in spent fuel. Annual report for period 15 August 1999 to 15 August 2000. United States: N. p., 2000. Web. doi:10.2172/765721.
Ken Czerwinski, & Don Reed. Chemical speciation of neptunium in spent fuel. Annual report for period 15 August 1999 to 15 August 2000. United States. doi:10.2172/765721.
Ken Czerwinski, and Don Reed. Fri . "Chemical speciation of neptunium in spent fuel. Annual report for period 15 August 1999 to 15 August 2000". United States. doi:10.2172/765721. https://www.osti.gov/servlets/purl/765721.
@article{osti_765721,
title = {Chemical speciation of neptunium in spent fuel. Annual report for period 15 August 1999 to 15 August 2000},
author = {Ken Czerwinski and Don Reed},
abstractNote = {(B204) This project will examine the chemical speciation of neptunium in spent nuclear fuel. The R&D fields covered by the project include waste host materials and actinide chemistry. Examination of neptunium is chosen since it was identified as a radionuclide of concern by the NERI workshop. Additionally, information on the chemical form of neptunium in spent fuel is lacking. The identification of the neptunium species in spent fuel would allow a greater scientific based understanding of its long-term fate and behavior in waste forms. Research to establish the application and development of X-ray synchrotrons radiation (XSR) techniques to determine the structure of aqueous, adsorbed, and solid actinide species of importance to nuclear considerations is being conducted at Argonne. These studies extend current efforts within the Chemical Technology Division at Argonne National Laboratory to investigate actinide speciation with more conventional spectroscopic and solids characterization (e.g. SEM, TEM, and XRD) methods. Our project will utilize all these techniques for determining neptunium speciation in spent fuel. We intend to determine the chemical species and oxidation state of neptunium in spent fuel and alteration phases. Different types of spent fuel will be examined. Once characterized, the chemical behavior of the identified neptunium species will be evaluated if it is not present in the literature. Special attention will be given to the behavior of the neptunium species under typical repository near-field conditions (elevated temperature, high pH, varying Eh). This will permit a timely inclusion of project results into near-field geochemical models. Additionally, project results and methodologies have applications to neptunium in the environment, or treatment of neptunium containing waste. Another important aspect of this project is the close cooperation between a university and a national laboratory. The PI has a transuranic laboratory at MIT where students can perform spectroscopic and radiochemical experiments. Through the ANL partner, students can have additional experience performing research in a DOE setting. This will provide a unique and constructive opportunity for developing quality graduate students with experience and expertise in handling actinides. Our ability to produce experienced actinide scientists is currently restricted by the dearth of radiochemistry and nuclear research at universities. Regardless of all else, future researchers must be trained and educated if the United States is to maintain a leadership role in nuclear technology. This project provides such an opportunity.},
doi = {10.2172/765721},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {9}
}