Defense Waste Processing Facility (DWPF) Durability-Composition Models and the Applicability of the Associated Reduction of Constraints (ROC) Criteria for High TiO2 Containing Glasses
Defense Waste Processing Facility (DWPF) Durability-Composition Models and the Applicability of the Associated Reduction of Constraints (ROC) Criteria for High TiO2 Containing Glasses

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Publisher:

Published: 2016

Total Pages: 176

ISBN-13:

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Radioactive high level waste (HLW) at the Savannah River Site (SRS) has successfully been vitrified into borosilicate glass in the DWPF since 1996. Vitrification requires stringent product/process (P/P) constraints since the glass cannot be reworked once it has been poured into ten foot tall by two foot diameter canisters. A unique "feed forward" statistical process control (SPC) was developed for this control rather than relying on statistical quality control (SQC). In SPC, the feed composition to the DWPF melter is controlled prior to vitrification. In SQC, the glass product would be sampled after it is vitrified. Individual glass property-composition models form the basis for the "feed forward" SPC. The models transform constraints on the melt and glass properties into constraints on the feed composition going to the melter in order to determine, at the 95% confidence level, that the feed will be processable and that the durability of the resulting waste form will be acceptable to a geologic repository.

Application of Hydration Thermodynamics to Control of the DWPF Process
Application of Hydration Thermodynamics to Control of the DWPF Process

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Publisher:

Published: 1990

Total Pages: 13

ISBN-13:

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The Defense Waste Processing Facility (DWPF) at the Savannah River Site (SRS) will incorporate the radioactivity in the 130 million liters of high-level nuclear waste at SRS in a stable borosilicate glass. Glass product specifications requite control of processing parameters to ensure glass durability. A model of glass durability, based on hydration thermodynamics, has been used at SRS to aid in formulation of waste glasses; to explain the relative durability of different glasses under identical test conditions (MCC-1 test); and to explain the effects of changing test conditions on the observed durability of a given glass. This model has now been modified for use in control of the DWPF. It provides a tool which relates glass durability to parameters which can be controlled in the DWPF process. It provides a tool which relates glass durability to parameters which can be controlled in the DWPF process, primarily chemical composition. In this paper, the model is presented, and its projected role in control of the DWPF process is described.

Design and Construction Innovations of the Defense Waste Processing Facility
Design and Construction Innovations of the Defense Waste Processing Facility

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Publisher:

Published: 1990

Total Pages: 14

ISBN-13:

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Construction of the Defense Waste Processing Facility (DWPF) at the Savannah River Site (SRS) is essentially complete. The facility is designed to convert high level radioactive waste, now contained in large steel tanks as aqueous salts and sludge, into borosilicate glass which will solidify in stainless steel canisters. All processing of the radioactive material and operations in a radioactive environment will be done remotely. The stringent requirements dictated by remote operation and new approaches to the glassification process led to the development of a number of first-of-a-kind pieces of equipment, new construction fabrication and erection techniques, and new applications of old techniques. The design features and construction methods used in the vitrification building and its equipment were to accomplish the objective of providing a state-of-the-art vitrification facility. 3 refs., 10 figs.

Transcutaneous Bilirubinometry
Transcutaneous Bilirubinometry

Author: Daniele De Luca

Publisher: Nova Science Publishers

Published: 2013

Total Pages: 0

ISBN-13: 9781626182486

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This book has been written to summarise the available knowledge regarding transcutaneous bilirubinometry, the first technique that allows a completely non-invasive measurement of a clinical variable. This technique led to important changes in the management of neonatal jaundice, the most common clinical condition of new-born infants world-wide. Transcutaneous bilirubinometry has its roots in the old observation that yellow skin colour is due to the deposition of bilirubin, a chromophore molecule. More recently, transcutaneous bilirubinometry has involved many disciplines; and accordingly, this book has contributions from physicists, biologists, paediatric dermatologists and neonatologists who have clinical research expertise in the field of neonatal hyperbilirubinemia. We hope that this book may prompt the advancement of research that will answer the as-yet unanswered questions, improve the reliability and usefulness of transcutaneous bilirubinometry, and respond to the clinical needs of our little patients.

High Performance Light Water Reactor
High Performance Light Water Reactor

Author: Thomas Schulenberg

Publisher: KIT Scientific Publishing

Published: 2014-07-28

Total Pages: 258

ISBN-13: 3866448171

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Results of the project "High Performance Light Water Reactor--Phase 2," carried out September 2006-February 2010 as part of the 6th European Framework Program.

Near Surface Disposal Facilities for Radioactive Waste
Near Surface Disposal Facilities for Radioactive Waste

Author: International Atomic Energy Agency

Publisher:

Published: 2014

Total Pages: 0

ISBN-13: 9789201143136

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This Safety Guide provides recommendations on how to meet safety requirements on the disposal of radioactive waste. It is concerned with the disposal of solid radioactive waste by emplacement in designated facilities at or near the land surface. The Safety Guide provides guidance on the development, operation and closure of, and on the regulatory control of, near surface disposal facilities, which are suitable for the disposal of very low level waste and low level waste. The Safety Guide provides guidance on a range of disposal methods, including the emplacement of solid radioactive waste in earthen trenches, in above ground engineered structures, in engineered structures just below the ground surface and in rock caverns, silos and tunnels excavated at depths of up to a few tens of metres underground. It is intended for use primarily by those involved with policy development for, with the regulatory control of, and with the development and operation of near surface disposal facilities.