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Title: Sampling and Characterization of 618-2 Anomalous Material

Abstract

Excavation of the 618-2 Burial Ground has produced many items of anomalous waste. Prior to temporary packaging and/or storage, these items have been characterized in the field to identify radiological and industrial safety conditions.

Authors:
Publication Date:
Research Org.:
Washington Closure Hanford (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
972723
Report Number(s):
WCH-101
TRN: US1001795
DOE Contract Number:
DE-AC06-05RL14655
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; ALARA; CONTAINERS; CONTAMINATION; EXCAVATION; PACKAGING; PERSONNEL; SAFETY; SAMPLING; SOLID WASTES; STORAGE; 618-2, burial ground, sampling

Citation Formats

A.E. Zacharias. Sampling and Characterization of 618-2 Anomalous Material. United States: N. p., 2006. Web. doi:10.2172/972723.
A.E. Zacharias. Sampling and Characterization of 618-2 Anomalous Material. United States. doi:10.2172/972723.
A.E. Zacharias. Thu . "Sampling and Characterization of 618-2 Anomalous Material". United States. doi:10.2172/972723. https://www.osti.gov/servlets/purl/972723.
@article{osti_972723,
title = {Sampling and Characterization of 618-2 Anomalous Material},
author = {A.E. Zacharias},
abstractNote = {Excavation of the 618-2 Burial Ground has produced many items of anomalous waste. Prior to temporary packaging and/or storage, these items have been characterized in the field to identify radiological and industrial safety conditions.},
doi = {10.2172/972723},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Apr 27 00:00:00 EDT 2006},
month = {Thu Apr 27 00:00:00 EDT 2006}
}

Technical Report:

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  • A “lessons learned” is a noteworthy practice or innovative approach that is captured and shared to promote repeat application, or an adverse work practice/experience that is captured and shared to avoid reoccurrence. This document provides the lessons learned identified by the 618-10 Burial Ground trench remediation and the 618-10 and 618-11 Burial Ground nonintrusive characterization of the vertical pipe units (VPUs).
  • Particulate sampling experiments were carried out sampling both from a straight tube and from a continuous stirred tank reactor. Mathematical models for both were developed. For the straight tube case: flow rate was important; sedimentation was important for particles > 5 ..mu..m in a horizontal pipe; thermophoresis was important if temperature gradients existed; Brownian motion, condensation and nucleation and coagulation were less important in the experimental conditions. For sampling from the stirred tank reactor, a different model was necessary. Thermophoresis was important with high temperature gradients; with fine particles (< 0.1 ..mu..m) Brownian diffusion and at high concentrations, coagulation weremore » important; for larger particles (> 1 ..mu..m) sedimentation was more important. (LTN)« less
  • This report describes the results obtained from deployment of the Enhanced Site Characterization System (ESCS) at the Hanford Site's 618-4 Burial Ground. The objective of this deployment was to use advanced geostatistical methods to integrate and interpret geophysical and ground truth data, to map the physical types of waste materials present in unexcavated portions of the burial ground. One issue of particularly interest was the number of drums (containing depleted uranium metal shavings or uranium-oxide powder) remaining in the burial ground and still requiring removal.Fuzzy adaptive resonance theory (ART), a neural network classification method, was used to cluster the studymore » area into 3 classes based on their geophysical signatures. Multivariate statistical analyses and discriminant function analysis (DFA) indicated that the drum area as well as a second area (the SW anomaly) had similar geophysical signatures that were different from the rest of the burial ground. Further analysis of the drum area suggested that as many as 770 drums to 850 drums may remain in that area. Similarities between the geophysical signatures of the drum area and the SW anomaly suggested that excavation of the SW anomaly area also proceed with caution. Deployment of the ESCS technology was successful in integrating multiple geophysical variables and grouping these observations into clusters that are relevant for planning further excavation of the buried ground. However, the success of the technology could not be fully evaluated because reliable ground truth data were not available to enable calibration of the different geophysical signatures against actual waste types.« less
  • This report describes the results obtained from deployment of the Enhanced Site Characterization System (ESCS) at the Hanford Site's 618-4 Burial Ground. The objective of this deployment was to use advanced geostatistical methods to integrate and interpret geophysical and ground truth data, to map the physical types of waste materials present in unexcavated portions of the burial ground. One issue of particularly interest was the number of drums (containing depleted uranium metal shavings or uranium-oxide powder) remaining in the burial ground and still requiring removal.Fuzzy adaptive resonance theory (ART), a neural network classification method, was used to cluster the studymore » area into 3 classes based on their geophysical signatures. Multivariate statistical analyses and discriminant function analysis (DFA) indicated that the drum area as well as a second area (the SW anomaly) had similar geophysical signatures that were different from the rest of the burial ground. Further analysis of the drum area suggested that as many as 770 drums to 850 drums may remain in that area. Similarities between the geophysical signatures of the drum area and the SW anomaly suggested that excavation of the SW anomaly area also proceed with caution.Deployment of the ESCS technology was successful in integrating multiple geophysical variables and grouping these observations into clusters that are relevant for planning further excavation of the buried ground. However, the success of the technology could not be fully evaluated because reliable ground truth data were not available to enable calibration of the different geophysical signatures against actual waste types.« less
  • This report presents the nonintrusive characterization measurement results for the 618-10 Burial Ground and provides a general assessment of the estimated dose, isotopic concentrations, and bounding transuranic radionuclide inventories for the 618-10 vertical pipe units and trenches, based on interpretation of data from a system of in situ radiological multi-detector probes.