[en] Selected samples of anomalous surface features commonly associated with the various types of uranium deposits are presented, and recommendations for sensor applications are given. The features studied include: epigenetic uranium ore roll type; precambrian basal conglomerate type; vein-type uranium deposits; pipe-structure or diatreme deposits; evaporitic uranium deposits. The hydrogeology of the Mosquito Range and the San Luis Valley is also examined. (Author)

[en] Research was conducted to identify the emission band at about 13,000 cm^-1 of Ni²⁺ ions to study the radiation effect on this emission band and, to present the models and radiation mechanism of Mn²⁺ and Co²⁺ doped KMgF₃ crystals. The mechanism which causes the enhanced intensity for the optical transitions of Mn²⁺ and Co²⁺ ions in irradiated KMgF₃ crystals was also investigated. By examining two optical emission bands due to Ni²⁺ ions in each of four different crystals, KMgF₃, KZnF₃, MgO, and MgF₂, it has been possible to unambiguously determine the origins of 20,000 cm^-1--21,000 cm^-1 band as arising from ¹T₂ to ³A₂/sub g/ transition and 13,000 cm^-1--14,000 cm^-1 band as coming from ¹T₂/sub g/ to ³T₂/sub g/ transition. The interpretation relies on the comparison of the measured transition energies in this work with existing optical absorption, emission, and excitation data, on the observation of spin orbit splitting for the first excited states and on the analysis of polarization measurements in MgF₂:Ni. The emission bands at 680 nm for KMgF₃:Mn and 670 nm for MgF₂:Mn are tentatively assigned to Mn²⁺--F center-interstitial complexes, whereas the emission bands at 720 nm for KMgF₃:Mn and 700 nm for MgF₂:mn are due to Mn²⁺--F center complexes. The 658 nm (15,000 cm^-1), 830 nm (12,000 cm^-1), and 875 nm (11,000 cm^-1) emission bands observed in irradiated KMgF₃:Co apparently are due to Co²⁺--F center complex. The 658 nm band, 830 nm band and 875 nm band are tentatively assigned to the ²T₁/sub g/ to ⁴T₁/sub g/, ⁴A₂/sub g/ to ⁴T₁/sub g/, and ²E/sub g/ to ⁴T₁/sub g/ transitions of Co²⁺, respectively. By the optical bleaching experiments, the unusually high strengths of radiation defect perturbed Mn²⁺ and Co²⁺ transitions appear to be due to exchange interactions between F centers and 3d impurities

[en] The range of energetic electrons in subnormal density material can be dramatically reduced to prevent target preheat without significant mass penalty. Electron range scaling law and calculational design of an experiment to verify range reduction are presented

[en] The evolution in flat and curved space-time of quantum fields in theories with relative flat potential and its consequences are considered. It is shown that bubble nucleation, a quantum mechanical tunnelling process, may occur in flat space-time, having a bounce solution, even if V(phi) has no barrier. It is shown that bubble nucleation can also occur in curved space-time even though there is no bounce solution in the standard formalism for the bubble nucleation rate in curved space-time. Additionally, bubbles can nucleate during the slow rolling period on the potential in flat and curved space-time, in this case also there is no bounce solution. It is known in the new inflationary scenario that energy density perturbations caused by quantum fluctuations of the scalar field can satisfy the presently observed bounds on density perturbations. Bubble nucleation during the slow rolling period also gives rise to density perturbations. For a model potential density perturbations by bubbles are calculated at the horizon reentering. By applying the bound from the almost isotropic microwave black body radiation on these density perturbations, a constraint on the model potential is obtained. Finally, some further implications on the galaxy formation and applications in more realistic potential are discussed

[en] At rated power, two turbine-driven feed water pumps and two booster pumps are operating in YGN 3 and 4 feed water system. If one of these four running pumps trips, Reactor Power Cutback system immediately takes an action to lower the plant power up to 20 % of the load to keep the reactor from being tripped by low steam-generator level. And the possibility of this RPCS event is pretty high because any one pump stop out of the four running ones initiates the action. This paper shows the modeling analysis and simulation results of the one pump stopping at 100% power operation and no RPCS action. The two tests' consequences revealed that the reactor was tripped by low steam-generator level at 2 min. 48 seconds and 3 min. 30 seconds later from the event. Also the one feed water pump trip and RPCS action after two minutes test in the simulation indicated that the steam-generator level decreased to 43 % at the maximum by wide range level indicator, which is 25 seconds later from RPCS action, and then the level restored to the normal operating range. Through this analysis results it is expected to make the plant usage rate higher by getting rid of the RPCS action as a result if the system is modified to start the

[en] Air permeability testing is conducted along intervals of the heater emplacement borehole (H1). The objectives of these tests are to characterize the in-situ permeability of the fractured tuff around the H1 borehole and to determine the effect of a heating and cooling cycle on the rock mass permeability. A number of permeability measurements were made along packed-off intervals of the borehole prior to heating the rock mass. These measurements will be repeated after the heating and cooling cycle. Preheating and postheating permeability values will later be compared to determine any effects on the rock mass permeability

[en] Numerics of LANCELOT(Licensing ANalysis Code for Evaluating Loss Of Coolant Transient) code for Loss-of-Coolant Accident analysis has been developed. The governing equations for two fluid model were derived using Eulerian averaging approach and their finite difference equations were obtained based on standard semi-implicit scheme. Several assessments were successfully performed to validate the numerical scheme. Especially, the comparison study with SETS(Stability-Enhancing Two Step) scheme used in TRAC-PF1 provides a basis for the improvement of numerical stability and accuracy

No abstract available

[en] An electrical resistance heater, installed in the H1 borehole, is used to thermally perturb the rock mass through a controlled heating and cooling cycle. Heater power levels are controlled by a Variac power transformer and are measured by wattmeters. Temperatures are measured by thermocouples on the borehole wall and on the heater assembly. Power and temperature values are recorded by the DAS described in Chapter 12. The heater assembly consists of a 3.55-m (11.6-ft) long by 20.3-cm (8-in.) O.D., Type 304 stainless steel pipe, containing a tubular hairpin heating element. The element has a heated length of 3 m (9.84 ft). The power rating of the element is 10 kW; however, we plan to operate the unit at a maximum power of only 3 kW. The heater is positioned with its midpoint directly below the axis of the P2 borehole, as shown in the borehole configuration diagram. This heater midpoint position corresponds to a distance of approximately 8.5 m (27.9 ft) from the H1 borehole collar. A schematic of the heater assembly in the borehole is shown. The distance from the borehole collar to the closest point on the assembly (the front end) is 6.5 m (21.3 ft). A high-temperature inflatable packer, used to seal the borehole for moisture collection, is positioned 50 cm (19.7 in.) ahead of the heater front end. The heater is supported and centralized within the borehole by two skids, fabricated from 25-mm (1-in.) O.D. stainless steel pipe. Thermocouples are installed at a number of locations in the H1 borehole. Four thermocouples that are attached to the heater skin monitor temperatures on the outer surface of the can, while three thermocouples that are held in place by rock sections monitor borehole wall temperatures beneath the heater. Temperatures are also monitored at the heater terminal and on the packer hardware

[en] The thermal loading exerted by the heater will dry the partially saturated rock surrounding the emplacement borehole. Vapor pressure gradients will drive water vapor into the emplacement borehole and fractures. The water vapor might also move along the fractures toward the emplacement hole or outward and condense where the temperatures are sufficiently cool. To improve one's understanding of the hydrological environment around the heater, the authors are collecting the moisture entering the heater emplacement borehole