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At least 145 records · Page 8
All sourcesNASA NTRSDOE OSTI
DOE OSTI2025

Y-12 National Security Complex Biological Monitoring and Abatement Program—2024 Calendar Year Report

This report provides the results of the CY 2024 sampling of East Fork Poplar Creek (EFPC) as part of the Y-12 National Security Complex (Y-12) Biological Monitoring and Abatement Program (BMAP). The results are presented in the context of historical trends. The Y-12 BMAP was developed in 1985 to demonstrate that the effluent limits established for Y-12 protected the classified uses of the receiving stream, particularly the growth and propagation of aquatic life (Loar et al. 1989). Over the years, the BMAP has become an important and valuable long-term measure of stream conditions resulting from actions and activities at the Y-12 Complex. The BMAP currently consists of three tasks: (1) bioaccumulation monitoring, (2) benthic macroinvertebrate community monitoring, and (3) fish community monitoring. The benthic macroinvertebrate community monitoring task includes studies to evaluate the receiving stream’s biological integrity annually in comparison with Tennessee Water Quality Criteria following Tennessee Department of Environment and Conservation (TDEC) protocols. In addition to presenting the EFPC biological monitoring results, this report includes results from Comprehensive Environmental Response, Compensation, and Liability Act–funded BMAP programs in Bear Creek and McCoy Branch (presented in Appendixes A and B, respectively), as required in the Y-12 National Pollutant Discharge Elimination System (NPDES) permit. Additional biological testing at the Y-12 Complex includes toxicity testing of select storm drains as required in the NPDES permit. Although toxicity testing is not formally part of the BMAP, toxicity testing results from 2024 are provided in Appendix C.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2021

Surface and Bulk Oxygen Kinetics of BaCo 0.4 Fe 0.4 Zr 0.2-X Y X O 3-δ Triple Conducting Electrode Materials

Triple ionic-electronic conductors have received much attention as electrode materials. In this work, the bulk characteristics of oxygen diffusion and surface exchange were determined for the triple-conducting BaCo 0.4 Fe 0.4 Zr 0.2-X Y X O 3-δ suite of samples. Y substitution increased the overall size of the lattice due to dopant ionic radius and the concomitant formation of oxygen vacancies. Oxygen permeation measurements exhibited a three-fold decrease in oxygen permeation flux with increasing Y substitution. The DC total conductivity exhibited a similar decrease with increasing Y substitution. These relatively small changes are coupled with an order of magnitude increase in surface exchange rates from Zr-doped to Y-doped samples as observed by conductivity relaxation experiments. The results indicate that Y-doping inhibits bulk O 2- conduction while improving the oxygen reduction surface reaction, suggesting better electrode performance for proton-conducting systems with greater Y substitution.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2021

Nuclear Materials Process Modeling at the Y-12 National Security Complex

The Y-12 National Security Complex (Y-12) has implemented process modeling for various accountable nuclear materials operations that are performed throughout the plant. Using a discrete, event-based dynamic simulation program, key nuclear material streams are modeled, allowing Y-12 to effectively manage numerous points of interest within the plant’s production operations. Integration of the various material processes into a single, interdependent supply and demand model is one of the ongoing focuses within Y-12’s process modeling effort. The primary purpose of using dynamic simulation modeling is to allow for analysis of the nuclear materials inventories and forecasted supplies based on future demands. Analysis of these inventories includes capacity evaluation, bottleneck mitigation, and assessments of individual pieces of equipment to inform future facility investment decisions and associated project schedules. Modeling of the nuclear materials processes throughout the complex also allows for incorporation of changes relevant to production capabilities such as the upcoming transition of specific operations to the new Uranium Processing Facility. Prior to implementation of process modeling, Y-12 forecasted supply and demand of accountable nuclear materials streams using Microsoft Excel. With deterministic models such as Microsoft Excel, the annual forecasts, generated within data input condition parameters, can only provide a fixed point of data. Fixed data cannot simulate integrated material streams and account for the possibility of occurrences and other changes that dynamic simulations take into consideration. Y-12’s dynamic process modeling allows integrated simulations of multiple accountable nuclear materials processes, including supply and demand forecasting and analysis, and is a coordinated effort involving many steps of verification and validation (V&V), site briefings, testing, reporting, data mining, planning, and documentation that spans various programs throughout the Y-12 complex.

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
DOE OSTI2020

Materials Data on Y(MnAl2)4 by Materials Project

YMn4Al8 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded to eight equivalent Mn and twelve Al atoms to form distorted YMn8Al12 cuboctahedra that share corners with eight equivalent YMn8Al12 cuboctahedra, faces with two equivalent YMn8Al12 cuboctahedra, and faces with sixteen equivalent MnY2Mn2Al8 cuboctahedra. All Y–Mn bond lengths are 3.34 Å. There are four shorter (3.00 Å) and eight longer (3.13 Å) Y–Al bond lengths. Mn is bonded to two equivalent Y, two equivalent Mn, and eight Al atoms to form distorted MnY2Mn2Al8 cuboctahedra that share corners with ten equivalent MnY2Mn2Al8 cuboctahedra, edges with four equivalent MnY2Mn2Al8 cuboctahedra, faces with four equivalent YMn8Al12 cuboctahedra, and faces with six equivalent MnY2Mn2Al8 cuboctahedra. Both Mn–Mn bond lengths are 2.47 Å. There are four shorter (2.54 Å) and four longer (2.65 Å) Mn–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Y, four equivalent Mn, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.70–2.84 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Y, four equivalent Mn, and six Al atoms. Both Al–Al bond lengths are 2.72 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(Al2Cu)4 by Materials Project

Al8Cu4Y crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Y–Cu bond lengths are 3.37 Å. There are four shorter (3.06 Å) and eight longer (3.21 Å) Y–Al bond lengths. Cu is bonded in a 12-coordinate geometry to two equivalent Y, two equivalent Cu, and eight Al atoms. Both Cu–Cu bond lengths are 2.57 Å. There are four shorter (2.56 Å) and four longer (2.69 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Y, four equivalent Cu, and five Al atoms. There are one shorter (2.67 Å) and four longer (2.81 Å) Al–Al bond lengths. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Y, four equivalent Cu, and six Al atoms. Both Al–Al bond lengths are 2.73 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(FeB)2 by Materials Project

Y(FeB)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Fe and eight equivalent B atoms. All Y–Fe bond lengths are 2.97 Å. All Y–B bond lengths are 2.98 Å. Fe is bonded in a 4-coordinate geometry to four equivalent Y and four equivalent B atoms. All Fe–B bond lengths are 2.00 Å. B is bonded in a 4-coordinate geometry to four equivalent Y and four equivalent Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(BIr)2 by Materials Project

Y(IrB)2 is alpha Pu-derived structured and crystallizes in the orthorhombic Fddd space group. The structure is three-dimensional. Y is bonded in a 2-coordinate geometry to eight equivalent Ir and six equivalent B atoms. There are four shorter (3.05 Å) and four longer (3.25 Å) Y–Ir bond lengths. There are two shorter (2.97 Å) and four longer (3.15 Å) Y–B bond lengths. Ir is bonded in a 4-coordinate geometry to four equivalent Y and four equivalent B atoms. There are two shorter (2.08 Å) and two longer (2.19 Å) Ir–B bond lengths. B is bonded in a 4-coordinate geometry to three equivalent Y and four equivalent Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(GeRu)2 by Materials Project

Y(RuGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Ru and eight equivalent Ge atoms. All Y–Ru bond lengths are 3.27 Å. All Y–Ge bond lengths are 3.28 Å. Ru is bonded in a 4-coordinate geometry to four equivalent Y and four equivalent Ge atoms. All Ru–Ge bond lengths are 2.44 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Y, four equivalent Ru, and one Ge atom. The Ge–Ge bond length is 2.58 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(Al2Cr)4 by Materials Project

Al8Cr4Y crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 12-coordinate geometry to eight equivalent Cr and twelve Al atoms. All Y–Cr bond lengths are 3.40 Å. There are four shorter (3.01 Å) and eight longer (3.21 Å) Y–Al bond lengths. Cr is bonded to two equivalent Y, two equivalent Cr, and eight Al atoms to form distorted CrY2Al8Cr2 cuboctahedra that share corners with eight equivalent AlY2Al6Cr4 cuboctahedra, corners with ten equivalent CrY2Al8Cr2 cuboctahedra, edges with four equivalent CrY2Al8Cr2 cuboctahedra, edges with four equivalent AlY2Al6Cr4 cuboctahedra, faces with six equivalent CrY2Al8Cr2 cuboctahedra, and faces with eight equivalent AlY2Al6Cr4 cuboctahedra. Both Cr–Cr bond lengths are 2.53 Å. There are four shorter (2.57 Å) and four longer (2.68 Å) Cr–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Y, four equivalent Cr, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.72–2.91 Å. In the second Al site, Al is bonded to two equivalent Y, four equivalent Cr, and six Al atoms to form distorted AlY2Al6Cr4 cuboctahedra that share corners with eight equivalent CrY2Al8Cr2 cuboctahedra, corners with ten equivalent AlY2Al6Cr4 cuboctahedra, edges with three equivalent AlY2Al6Cr4 cuboctahedra, edges with four equivalent CrY2Al8Cr2 cuboctahedra, faces with seven equivalent AlY2Al6Cr4 cuboctahedra, and faces with eight equivalent CrY2Al8Cr2 cuboctahedra. Both Al–Al bond lengths are 2.81 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(SiPt)2 by Materials Project

Y(PtSi)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Pt and eight equivalent Si atoms. All Y–Pt bond lengths are 3.24 Å. All Y–Si bond lengths are 3.19 Å. Pt is bonded to four equivalent Y and four equivalent Si atoms to form a mixture of distorted face, edge, and corner-sharing PtY4Si4 tetrahedra. All Pt–Si bond lengths are 2.47 Å. Si is bonded in a 9-coordinate geometry to four equivalent Y, four equivalent Pt, and one Si atom. The Si–Si bond length is 2.33 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(Al2Fe)4 by Materials Project

YFe4Al8 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 12-coordinate geometry to eight equivalent Fe and twelve Al atoms. All Y–Fe bond lengths are 3.32 Å. There are four shorter (2.96 Å) and eight longer (3.16 Å) Y–Al bond lengths. Fe is bonded in a 12-coordinate geometry to two equivalent Y, two equivalent Fe, and eight Al atoms. Both Fe–Fe bond lengths are 2.51 Å. There are four shorter (2.52 Å) and four longer (2.63 Å) Fe–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Y, four equivalent Fe, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.72–2.80 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Y, four equivalent Fe, and six Al atoms. Both Al–Al bond lengths are 2.72 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(SiPd)2 by Materials Project

Y(PdSi)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Pd and eight equivalent Si atoms. All Y–Pd bond lengths are 3.25 Å. All Y–Si bond lengths are 3.16 Å. Pd is bonded to four equivalent Y and four equivalent Si atoms to form a mixture of distorted edge, face, and corner-sharing PdY4Si4 tetrahedra. All Pd–Si bond lengths are 2.47 Å. Si is bonded in a 9-coordinate geometry to four equivalent Y, four equivalent Pd, and one Si atom. The Si–Si bond length is 2.33 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(GeRh)2 by Materials Project

Y(RhGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Rh and eight equivalent Ge atoms. All Y–Rh bond lengths are 3.32 Å. All Y–Ge bond lengths are 3.19 Å. Rh is bonded to four equivalent Y and four equivalent Ge atoms to form a mixture of distorted corner, edge, and face-sharing RhY4Ge4 tetrahedra. All Rh–Ge bond lengths are 2.47 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Y, four equivalent Rh, and one Ge atom. The Ge–Ge bond length is 2.53 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(PRu)2 by Materials Project

Y(RuP)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Ru and eight equivalent P atoms. All Y–Ru bond lengths are 3.14 Å. All Y–P bond lengths are 3.11 Å. Ru is bonded in a 12-coordinate geometry to four equivalent Y and four equivalent P atoms. All Ru–P bond lengths are 2.36 Å. P is bonded in a 9-coordinate geometry to four equivalent Y, four equivalent Ru, and one P atom. The P–P bond length is 2.41 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(Sn3Ru2)2 by Materials Project

YRu4Sn6 crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. Y is bonded in a 12-coordinate geometry to four equivalent Ru and twelve Sn atoms. All Y–Ru bond lengths are 3.29 Å. There are a spread of Y–Sn bond distances ranging from 3.38–3.77 Å. Ru is bonded in a 7-coordinate geometry to one Y, two equivalent Ru, and six Sn atoms. Both Ru–Ru bond lengths are 2.84 Å. There are a spread of Ru–Sn bond distances ranging from 2.60–2.81 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 5-coordinate geometry to two equivalent Y and four equivalent Ru atoms. In the second Sn site, Sn is bonded in a 6-coordinate geometry to two equivalent Y and four equivalent Ru atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(Mg4Al3)4 by Materials Project

Y(Mg4Al3)4 crystallizes in the cubic I-43m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to seven Mg and five equivalent Al atoms. There are a spread of Mg–Mg bond distances ranging from 3.02–3.16 Å. There are a spread of Mg–Al bond distances ranging from 2.86–3.17 Å. In the second Mg site, Mg is bonded in a 10-coordinate geometry to three equivalent Mg, one Y, and six equivalent Al atoms. The Mg–Y bond length is 3.27 Å. All Mg–Al bond lengths are 3.16 Å. Y is bonded in a 12-coordinate geometry to four equivalent Mg and twelve equivalent Al atoms. All Y–Al bond lengths are 3.22 Å. Al is bonded in a 11-coordinate geometry to seven Mg, one Y, and three equivalent Al atoms. There are one shorter (2.70 Å) and two longer (2.78 Å) Al–Al bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(Re2Si)2 by Materials Project

Y(Re2Si)2 crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Y is bonded in a 6-coordinate geometry to twelve equivalent Re and six equivalent Si atoms. There are four shorter (3.23 Å) and eight longer (3.35 Å) Y–Re bond lengths. There are four shorter (3.02 Å) and two longer (3.05 Å) Y–Si bond lengths. Re is bonded to three equivalent Y, six equivalent Re, and three equivalent Si atoms to form a mixture of distorted corner, edge, and face-sharing ReY3Re6Si3 cuboctahedra. There are a spread of Re–Re bond distances ranging from 2.60–2.83 Å. There are one shorter (2.45 Å) and two longer (2.56 Å) Re–Si bond lengths. Si is bonded in a 9-coordinate geometry to three equivalent Y and six equivalent Re atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(ReB)4 by Materials Project

Y(ReB)4 crystallizes in the tetragonal P4_2/nmc space group. The structure is three-dimensional. Y is bonded in a 12-coordinate geometry to twelve equivalent Re and twelve equivalent B atoms. There are four shorter (3.08 Å) and eight longer (3.19 Å) Y–Re bond lengths. There are eight shorter (3.04 Å) and four longer (3.29 Å) Y–B bond lengths. Re is bonded in a 5-coordinate geometry to three equivalent Y and five equivalent B atoms. There are three shorter (2.22 Å) and two longer (2.34 Å) Re–B bond lengths. B is bonded in a 6-coordinate geometry to three equivalent Y, five equivalent Re, and one B atom. The B–B bond length is 1.81 Å.

36 MATERIALS SCIENCE↗