National Security Complex Research Articles

A review of criticality dosimetry at the Y-12 National Security Complex and practical importance of dose accuracy in emergency response

A nuclear criticality results in the emission of both neutron and gamma radiation and can produce doses to personnel near the event that exceed 0.1 Gy (10 rad). The primary purpose of nuclear accident dosimetry is to rapidly identify affected personnel in need of prompt medical treatment and to reassure personnel who have been only minimally exposed. While accurate dosimetry is desired, it must be recognized that dose determinations made from whole-body dosimeters or simple triage methods are very rough estimates and contain significant uncertainties. Even when accounting for factors like varying neutron energy spectra, mean photon energies, body orientation within the radiation field, and transient effects on dosimeter response, etc., the end value is a dosimetric quantity defined for very specific radiological conditions and determined within a simple phantom usually at a single depth. Of more importance is the biological response to the radiation, which will vary by person and can be affected by the individual's radiation sensitivity, age, gender, mass, and underlying health conditions. The overall biological, person-specific response to a given dose cannot be precisely determined except by patient symptom observation and individual biological dosimetry (e.g. chromosome analysis, lymphocyte ratios, etc.). This work describes and discusses the criticality accident dosimetry program at the Y-12 National Security Complex, a United States Department of Energy National Nuclear Security Administration facility. The primary goals of the Y-12 accident dosimetry program are, among others, the rapid identification of significantly exposed persons, prompt routing of exposed workers for medical evaluation and treatment, and the ultimate processing of dosimeters to assign doses to personnel.

Distributed Data Access in the National Security Complex

Distributed Data Access in the National Security Complex

Trichloroethylene replacements for the cleaning of silicone oil used in the internal gelation process

Silicone oil continues to be used as a gelation medium for internal gelation process. Typically, the silicone oil has been removed from the gel spheres using trichloroethylene (TCE) washes. However, TCE is no longer a viable option for large-scale operations because of environmental issues, health concerns, and disposal costs. During the development of a large gelation system at the Y-12 National Security Complex, two new TCE wash replacements were identified. NuSolv SOR-C and FluoSolv WS were used in a number of uranium runs and found to effectively remove silicone oil. NuSolv SOR-C was determined to be the best option.

Evaluation of Triage Methods for Criticality Accidents.

Studies indicate that early identification of persons involved in and receiving high doses of radiation in accidents is key to providing life-saving medical treatment. Although the risk of criticality accidents is low, the potential impact to workers is significant. For facilities that employ large numbers of workers, a key element in the response to a radiological emergency is identifying personnel that received significant and potentially harmful doses. Also important is having the ability to screen large numbers of workers to identify persons who did not receive significant exposure so as to reduce the impact on emergency response efforts. At the Y-12 National Security Complex, the focus on criticality accident response is the rapid triage of personnel in order to identify persons exposed to large radiation doses and to prioritize those persons receiving the highest exposures. Once identified, personnel are transported to local medical facilities, including the Radiation Emergency Assistance Center/Training Site (REAC/TS), for medical evaluation and treatment. The Y-12 external dosimetry program uses a number of techniques to identify and prioritize workers, and these methods were evaluated at a criticality dosimetry intercomparison exercise. The methods used were shown to perform as intended, and other sites may consider incorporating these methods into their accident dosimetry response procedures.

Reimagining Botswana’s national security in light of COVID-19

ABSTRACT The Botswana national security complex is fashioned around traditional (military) threats to security. This is demonstrated through the National Security Act and also by the country’s defense expenditure as a component of its GDP. Defense expenditure routinely takes the second largest share of GDP in Botswana. The outbreak of the novel Severe Acute Respiratory Distress Syndrome Corona Virus 2 (SARS-COV-2) or COVID-19, however, suggests a relook at Botswana’s national security towards none traditional security threats- in this case pandemics. The case for this is made clear by the evidently poor readiness to deal with possible mass infections both from a health budgetary perspective, and the availability of medical personal and equipment. This paper argues for securitisation of health care in Botswana- especially in light of the COVID-19 pandemic. This is possible through diversion of a portion current defense spending towards health care.

Некоторые особенности военно-экономической деятельности периода коронакризиса

COVID-19 related crisis is a collective designation of the current stage of the global system crisis, in which COVID-19 is a catalyst and a trigger of many ongoing processes, including destructive and destabilizing ones. The impact of this pandemic on military-economic activities (MEA) is direct and indirect. On the one hand, it is hampering MEA direct functioning, including personnel supply, a decrease in solvent demand, the possibility of financing and the implementation of military-technical cooperation. On the other hand, global tensions, confrontation, psychological instability and behavioral radicalism are on the rise under the COVID-19 conditions. And this is reflected in the demand for military power, power tools as a certain kind of “safety belt” and, accordingly, for MEA products, including non-traditional ones, for “hybrid” confrontations. In addition, due to the pandemic, the role of MEA as one of the “locomotives” of the recovery from the trap of the crisis, and as a technological incubator, has increased. Under the crisis conditions, the most important task for MEA is to increase its functional and economic efficiency. Taking into account the limited resources of MEA, in any case they should provide reliable military security of the Russian Federation (RF), so-called asymmetric deterrence. Drawing Russia into a costly arms race would be unacceptable, as it would contribute to the collapse of the country, like it has been the case with the USSR. Therefore, the issue of proper distribution of funds and resources within the framework of the entire national security complex of the RF between its foreign, military and home, socio-economic components is an acute one. In this regard, a pressing issue is to set tough priorities in determining the key directions of development of MEA of the Russian Federation, technological and military-technical policy, and the defense sector as a whole. And that should be reflected in the planning and implementation of the state armament program, the state defense order and other measures in the field of national defense and security.

Dose Rate Evaluation for the ES-3100 Package with HEU Content Using MCNP, ADVANTG, Monaco, and MAVRIC

This paper presents a comparative study of dose rate calculations for the ES-3100 package with highly enriched uranium (HEU) content for different source configurations using the following computer codes: MCNP, Automated Variance Reduction Generator (ADVANTG)/MCNP, Monaco, and Monaco with Automated Variance Reduction using Importance Calculations (MAVRIC). The Model ES-3100 package was developed at the Y-12 National Security Complex for domestic and international transportation of Type B fissile radioactive material. In this study, six different source configurations (i.e., solid cylinder, cylindrical hemishell, cylindrical shell, rectangular plate, cylindrical rod, and cylindrical segment form) having 36 kg of HEU metal inside the package containment vessel (based on configurations in the ES-3100/HEU safety analysis report for packaging) are evaluated. Dose rates at 1 mm and 1 m from the package surfaces are calculated for these different source configurations. The MCNP and Monaco cases are run without any biasing options to accelerate the convergence. The Consistent Adjoint Driven Importance Sampling and the Forward-Weighted Consistent Adjoint Driven Importance Sampling (FW-CADIS) methods developed at the Oak Ridge National Laboratory are implemented in the ADVANTG/MCNP and MAVRIC codes to accelerate the convergence. ADVANTG generates variance reduction parameters using the Denovo code, and MCNP is used with the variance reduction parameters to accelerate the convergence. MAVRIC uses the Denovo code to construct an importance map and a biased source distribution that are supplied to Monaco to accelerate the Monte Carlo simulation. The FW-CADIS option in ADVANTG and MAVRIC is used to accelerate the convergence in this study. The accelerated convergence cases (ADVANTG/MCNP and MAVRIC) are about 100 times faster with 100 times less particle simulation than those cases run without biasing options (analog MCNP and analog Monaco). The MCNP, ADVANTG/MCNP, Monaco, and MAVRIC calculated dose rates at 1 mm and 1 m from the package surfaces for the different source configurations are compared and are found to be in general agreement.

Pakistan’s Counter-Terrorism Narrative and Non-Traditional (Holistic) Security Paradigm with Civic Engagement

The woes of terrorism and extremism pose a threat to the stability, economic development and human growth of nations. It, therefore, remains a serious concern for the state to rethink its strategies towards bringing stability. This paper, on deploying content analysis technique, explores the traditional security paradigm as a state-centric approach under the diverse concept of security. The non-traditional approaches; Buzan’s holistic perspective of a national security complex, Mehbub-ul-Haq’s human security notion and Mohammed Ayoob’s concept of weak state, are scrutinized to study the actual and potential role of civic engagement towards constructing an effective counter-terrorism narrative of Pakistan. It is established that due civic engagement has the potential to counter the extreme dogmas through collaborative efforts at home. It can also address the wrong perception about Pakistan’s inefficient counter-terror measures at the regional and global level.

Governing ‘ungoverned’ space: humanitarianism, citizenship, and the civilian sphere in the territorialising practices of the US national security complex

ABSTRACTThe ‘war on terror’ has seen an increased overlap between military and humanitarian practices in US national security strategy. Guided by imaginative geographies of ‘ungoverned’ or ‘under-governed’ space, aid distribution and humanitarian assistance efforts are frequently coupled with stability efforts and counterinsurgency operations. This overlap has been buttressed by a growing collaboration between the Department of Defense, the Department of State and the United States Agency for International Development – often termed the ‘3Ds’of defense, development and diplomacy – bringing a greater influence of the civilian sphere on US national security strategy. In this paper, I explore the influence of the civilian sphere on these military-humanitarian practices. Through an analysis of publications and policy documents from across the US national security complex, I argue that the civilian sphere is central to US efforts to territorialize ostensibly insecure, ‘ungoverned’ space so as to extend US global geopolitical influence and the US-led global neoliberal market. This involves both a more substantial role for civilian organisations in security efforts, adding legitimacy and civilian expertise to territorialising military-humanitarian practices, and a growing focus on the harnessing of the civilian sphere of targeted populations on-the-ground through a greater emphasis on citizenship, and its related ideas of democracy, human rights, and the rule of law, in security policy. Not only does this focus on citizenship couch US intervention in a moral discourse, it also indicates how ‘ungoverned’ space is to be rendered ‘governed’ through the encouragement of a technology of citizenship and a subjectivity conducive to the expansion of the neoliberal market.

Oak Ridge Reservation Environmental Protection Rad Neshaps Radionuclide Inventory Web Database and Rad Neshaps Source and Dose Database.

The U.S. Environmental Protection Agency promulgated national emission standards for emissions of radionuclides other than radon from US Department of Energy facilities in Chapter 40 of the Code of Federal Regulations (CFR) 61, Subpart H. This regulatory standard limits the annual effective dose that any member of the public can receive from Department of Energy facilities to 0.1 mSv. As defined in the preamble of the final rule, all of the facilities on the Oak Ridge Reservation, i.e., the Y-12 National Security Complex, Oak Ridge National Laboratory, East Tennessee Technology Park, and any other U.S. Department of Energy operations on Oak Ridge Reservation, combined, must meet the annual dose limit of 0.1 mSv. At Oak Ridge National Laboratory, there are monitored sources and numerous unmonitored sources. To maintain radiological source and inventory information for these unmonitored sources, e.g., laboratory hoods, equipment exhausts, and room exhausts not currently venting to monitored stacks on the Oak Ridge National Laboratory campus, the Environmental Protection Rad NESHAPs Inventory Web Database was developed. This database is updated annually and is used to compile emissions data for the annual Radionuclide National Emission Standards for Hazardous Air Pollutants (Rad NESHAPs) report required by 40 CFR 61.94. It also provides supporting documentation for facility compliance audits. In addition, a Rad NESHAPs source and dose database was developed to import the source and dose summary data from Clean Air Act Assessment Package-1988 computer model files. This database provides Oak Ridge Reservation and facility-specific source inventory; doses associated with each source and facility; and total doses for the Oak Ridge Reservation dose.

安全保障問題と軍産複合体

安全保障問題と軍産複合体

Special Nuclear Material Characterization Using Digital 3-D Position Sensitive CdZnTe Detectors and High Purity Germanium Spectrometers

Special nuclear material (SNM) monitoring often requires high resolution gamma-ray spectroscopy for material characterization. Portable systems and rapid deployment are also highly valued for some applications. Deployable gamma-ray imaging spectrometers using pixelated CdZnTe semiconductor detectors have become commercially available within the past three years to meet these requirements. CdZnTe systems have demonstrated room-temperature energy resolutions below 0.5% FWHM at 662 keV using single pixel events and below 0.7% FWHM at 662 keV using all events. The systems are able to go from storage to measurement in less than two minutes. Special nuclear materials were measured at the Y-12 National Security Complex and at the Device Assembly Facility at the Nevada National Security Site. The use of a CdZnTe system to measure uranium enrichment was demonstrated and uranium spectral features were compared to a commercially available high purity germanium (HPGe) spectrometer. The use of passive gamma-ray spectroscopy techniques to estimate plutonium grade using CdZnTe detectors was demonstrated for the first time.

Obfuscation: A User's Guide for Privacy and Protest

Obfuscation: A User's Guide for Privacy and Protest

Generation of Improved Isotopic Molybdenum Covariances from Elemental Cross-Section Data Using SAMMY

There is a need for improved molybdenum isotope covariance data for use in modeling a new uranium-molybdenum fuel form to be produced at the Y-12 National Security Complex (Y-12). Covariance data correlate the uncertainty in an isotopic cross section at a particular energy to uncertainties at other energies. While high-fidelity covariance data exist for key isotopes, the low-fidelity covariance data available for most isotopes, including the natural molybdenum isotopes considered in this work, are derived from integral measurements without meaningful correlation between energy regions. This paper provides a framework for using the Bayesian R-matrix code SAMMY to derive improved isotopic resonance region covariance data from elemental experimental cross-section data. These resonance-wise covariance data were combined with integral uncertainty data from the Atlas of Neutron Resonances, uncertainty data generated via a dispersion method, and high-energy uncertainty data previously generated with the Empire-KALMAN code to produce an improved set of covariance data for the natural molybdenum isotopes. The improved covariance data sets, along with the associated resonance parameters, were inserted into JENDL4.0 data files for the molybdenum isotopes for use in data processing and modeling codes. Additionally, a series of critical experiments featuring the new U(19.5%)-10Mo fuel form produced at Y-12 was designed. Along with existing molybdenum sensitive critical experiments, these were used to compare the performance of the new molybdenum covariance data against the existing low-fidelity evaluation. The new covariance data were found to result in reduced overall bias, reduced bias due to the molybdenum isotopes, and improved goodness of fit of computational to experimental results.

Distribution of uranium and thorium in dolomitic gravel fill and shale saprolite

The objectives of this study were to examine (1) the distribution of U and Th in dolomitic gravel fill and shale saprolite, and (2) the removal of uranium from acidic groundwater by dolomitic gravel through precipitation with amorphous basaluminite at the U.S. DOE Oak Ridge Integrated Field Research Challenge (ORIFRC) field site west of the Oak Ridge Y-12 National Security Complex in East Tennessee. Media reactivity and sustainability are a technical concern with the deployment of any subsurface reactive media. Because the gravel was placed in the subsurface and exposed to contaminated groundwater for over 20 years, it provided a unique opportunity to study the solid and water phase geochemical conditions within the media after this length of exposure. This study illustrates that dolomite gravel can remove U from acidic contaminated groundwater with high levels of Al3+, Ca2+, NO3−, and SO42− over the long term. As the groundwater flows through high pH carbonate gravel, U containing amorphous basaluminite precipitates as the pH increases. This is due to an increase in groundwater pH from 3.2 to ∼6.5 as it comes in contact with the gravel. Therefore, carbonate gravel could be considered as a possible treatment medium for removal and sequestration of U and other pH sensitive metals from acidic contaminated groundwater. Thorium concentrations are also high in the carbonate gravel. Thorium generally shows an inverse relationship with U from the surface down into the deeper saprolite. Barite precipitated in the shallow saprolite directly below the dolomitic gravel from barium present in the acidic contaminated groundwater.

An estimate of the propagated uncertainty for a dosemeter algorithm used for personnel monitoring.

The Y-12 National Security Complex utilises thermoluminescent dosemeters (TLDs) to monitor personnel for external radiation doses. The TLD consist of four elements positioned behind various filters, and dosemeters are processed on site and input into an algorithm to determine worker dose. When processing dosemeters and determining the dose equivalent to the worker, a number of steps are involved, including TLD reader calibration, TLD element calibration, corrections for fade and background, and inherent sensitivities of the dosemeter algorithm. In order to better understand the total uncertainty in calculated doses, a series of calculations were performed using certain assumptions and measurement data. Individual contributions to the uncertainty were propagated through the process, including final dose calculations for a number of representative source types. Although the uncertainty in a worker's calculated dose is not formally reported, these calculations can be used to verify the adequacy of a facility's dosimetry process.

Leadership Failures in the National Security Complex

Current NSA forecast: continued Snowden flurries with no end in sight. No one blames the hardworking NSA employees for the latest series of gaffes; it's the feckless leadership and the politics that got them there that are responsible for our current difficulties.

Mercury source zone identification using soil vapor sampling and analysis

Development and demonstration of reliable measurement techniques that can detect and help quantify the nature and extent of elemental mercury (Hg(0)) in the subsurface are needed to reduce uncertainties in the decision-making process and increase the effectiveness of remedial actions. We conducted field tests at the Y-12 National Security Complex in Oak Ridge, Tennessee, USA, to determine if sampling and analysis of Hg(0) vapors in the shallow subsurface (< 0.3 m depth) can be used to as an indicator of the location and extent of Hg(0) releases in the subsurface. We constructed a rigid polyvinyl chloride push probe assembly, which was driven into the ground. Soil gas samples were collected through a sealed inner tube of the assembly and were analyzed immediately in the field with a Lumex and/or Jerome Hg(0) analyzer. Time-series sampling showed that Hg vapor concentrations were fairly stable over time, suggesting that the vapor phase Hg(0) was not being depleted and that sampling results were not sensitive to the soil gas purge volume. Hg(0) vapor data collected at over 200 push probe locations at 3 different release sites correlated very well to areas of known Hg(0) contamination. Vertical profiling of Hg(0) vapor concentrations conducted at two locations provided information on the vertical distribution of Hg(0) contamination in the subsurface. We conclude from our studies that soil gas sampling and analysis can be conducted rapidly and inexpensively at large scales to help identify areas contaminated with Hg(0).

Identification of Multiple Mercury Sources to Stream Sediments near Oak Ridge, TN, USA

Sediments were analyzed for total Hg concentration (THg) and isotopic composition from streams and rivers in the vicinity of the Y-12 National Security Complex (Y12) in Oak Ridge, TN (USA). In the stream directly draining Y12, where industrial releases of mercury (Hg) have been documented, high THg (3.26 to 60.1 μg/g) sediments had a distinct Hg isotopic composition (δ(202)Hg of 0.02 ± 0.15‰ and Δ(199)Hg of -0.07 ± 0.03‰; mean ± 1SD, n = 12) compared to sediments from relatively uncontaminated streams in the region (δ(202)Hg = -1.40 ± 0.06‰ and Δ(199)Hg of -0.26 ± 0.03‰; mean ± 1SD, n = 6). Additionally, several streams that are nearby but do not drain Y12 had sediments with intermediate THg (0.06 to 0.21 μg/g) and anomalous δ(202)Hg (as low as -5.07‰). We suggest that the low δ(202)Hg values in these sediments provide evidence for the contribution of an additional Hg source to sediments, possibly derived from atmospheric deposition. In sediments directly downstream of Y12 this third Hg source is not discernible, and the Hg isotopic composition can be largely explained by the mixing of low THg sediments with high THg sediments contaminated by Y12 discharges.

Characterization of soils from an industrial complex contaminated with elemental mercury

Historical use of liquid elemental mercury (Hg(0)l) at the Y-12 National Security Complex in Oak Ridge, TN, USA, resulted in large deposits of Hg(0)l in the soils. The fate and distribution of the spilled Hg(0) are not well characterized. In this study we evaluated analytical tools for characterizing the speciation of Hg in the contaminated soils and then used the analytical techniques to examine the speciation of Hg in two soil cores collected at the site. These include x-ray fluorescence (XRF), soil Hg(0) headspace analysis, and total Hg determination by acid digestion coupled with cold vapor atomic absorption (HgT). XRF was not found to be suitable for evaluating Hg concentrations in heterogeneous soils containing low concentration of Hg or Hg(0) because Hg concentrations determined using this method were lower than those determined by HgT analysis and the XRF detection limit is 20 mg/kg. Hg(0)g headspace analysis coupled with HgT measurements yielded good results for examining the presence of Hg(0)l in soils and the speciation of Hg. The two soil cores are highly heterogeneous in both the depth and extent of Hg contamination, with Hg concentrations ranging from 0.05 to 8400mg/kg. In the first core, Hg(0)l was distributed throughout the 3.2m depth, whereas the second core, from a location 12m away, contained Hg(0)l in a 0.3m zone only. Sequential extractions showed organically associated Hg dominant at depths with low Hg concentration. Soil from the zone of groundwater saturation showed reducing conditions and the Hg is likely present as Hg-sulfide species. At this depth, lateral Hg transport in the groundwater may be a source of Hg detected in the soil at the deeper soil depths. Overall, characterization of soils containing Hg(0)l is difficult because of the heterogeneous distribution of Hg within the soils. This is exacerbated in industrial facilities where fill materials make up much of the soils and historical and continued reworking of the subsurface has remobilized the Hg.