Showing papers in "Progress in Nuclear Energy in 2003"

TL;DR: Adjoint methodology and the concept of “importance” are presented, along with an explanation of their use for variance reduction of Monte Carlo simulations, and aspects of interest are demonstrated.

TL;DR: The 75-problem test set allows the user to verify the correctness of a criticality code for infinite medium and simple geometries in one- and two-energy groups, one-and- two-media, and both isotropic and linearly anisotropic neutron scattering.

TL;DR: The SP100 space nuclear reactor was designed for use as an orbital power supply, lunar or Martian surface power station, and power supply for nuclear electric propulsion, with a scaleable power range of 10's kWe to 100'skWe.

TL;DR: In this paper, high-speed video observations were conducted on a nuclear reactor cooling pump, in which, the bubbles motions into the impeller passages were identified, and it was shown that under such, two-phase flow conditions the reactor cooling pumps become unable to generate the same head as that of a single-phase case.

TL;DR: Development of data-driven system models using Group Method of Data Handling (GMDH), Principal Component Analysis (PCA) and Adaptive Network-based Fuzzy Inference System (ANFIS) for fault detection and isolation of sensors and field devices is presented.

TL;DR: This paper reviewed the theories of attitude formation and change, risk perception, and their relationship with the public's nuclear education, and attempts to explain the seemingly conflicting findings, and made suggestions for future educational efforts.

TL;DR: The results of performance tests on PEANO are described with real data from a US PWR plant, in the framework of a co-operation among IFE, EPRI and Edan Engineering, to evaluate the potentials ofPEANO for future installations in US nuclear plants.

TL;DR: In this paper, a method based on an analytical exponential mode (AEM) was proposed as an analytical solution to the point kinetics equations, which is valid and accurate for step point reactivity at any time.

TL;DR: In this paper, the theory of Feynman-alpha measurements is elaborated for the case of a "stochastically pulsed" subcritical system, where no synchronisation between the start of the measurement time gate and the pulsing is made.

TL;DR: A fuzzy logic-based algorithm is presented which allows to build a predictive model of an evolving signal and the if-then rules are inferred from the available input-output data to detect any deviation of the process due either to a component's failure or to an operator's action.

TL;DR: The appearance of the terms “Monitoring” and “Diagnosis” alongside the term “Web Technology” in the title of this paper does not mean that remote access to diagnostic systems over the Internet is being presented here as a simple extension of the existing situation.

TL;DR: In this paper, a method is proposed for the determination of the prompt reactivity of a subcritical assembly through the response to a dirac pulse, in particular in the cases of a large reflector, a small reactor, or a large subcriticality.

TL;DR: The reactor system, the real time data collection and the merits of the three types of the neural network applied while in the learning and continuous processing of the changing of the operational conditions are presented.

TL;DR: It is proposed to envelop the plant with two anticipatory control blankets, one pertaining to problems emerging due to wear and fatigue, and the other pertaining to unanticipated design basis events.

TL;DR: In this article, the current-to-flux reactivity indicator is used to measure the reactivity of an accelerator beam in a sub-critical multiplying medium with a driving source, where the flux level is proportional to the driving source intensity, hence the beam current, and the reactive level.

TL;DR: It was shown that the neuro-expert system successfully monitored the plant status at Borssele Nuclear Power Plant in the Netherlands and worked satisfactorily in diagnosing the system status by using the outputs of the neural networks and a priori knowledge base from the PWR simulator.

TL;DR: In this article, an impulse response function estimation is introduced, which substitutes the widely used cross-correlation measurement technique, and it is shown in theory and practice that the time delay estimation is improved when using the impulse response instead of the cross correlation function in parameter estimation.

TL;DR: In this paper, the power signal was divided into small blocks and each block was considered from the point of view of the noise analysis, and the Reactor was stable within the preliminary blocks and unstable at the final blocks.

TL;DR: In this article, the recent advances in spectral nodal methods applied to discrete ordinates (SN) and diffusion problems in Cartesian geometry for neutron multiplying systems are described, and numerical results to various typical model problems are given, and general concluding remarks and suggestions for future work are given.

TL;DR: In this article, the authors describe the regular neutron noise diagnostics measurements performed by KFKI AEKI at the four units of the Hungarian Paks NPP, emphasising their importance in practical plant operation.

TL;DR: In this article, the authors presented the measuring system, the operational tasks, and the results obtained so far on the real-time core-barrel motions (CBM) and the two-primary coolant pump vibrations measured through the reactor noise analysis.

TL;DR: In this article, a plant-wide mass and heat balance model was fitted to 39 values of temperature, pressure and flow for a turbine cycle supplied by steam from a BWR.

TL;DR: In this paper, in-core flux detectors (ICFD), ion chambers (I/C), flow transmitters, pressure transmitters and resistance temperature detectors (RTD) are used for parameter estimation and anomaly detection.

TL;DR: In this article, a method of leak detection based on high-temperature resistant microphones was originally developed in JNC to detect leakages with flow rates from 1 m 3 /h to 500m 3/h. The development performed on Fugen is focused on detection of a small leakage at an early stage.

TL;DR: Two particular new methods for treating new problems at the Ringhals PWRs are described in detail: the determination of the axial position of control rods from theAxial shape of the neutron flux with neural network methods, and the use of gamma thermometers for thedetermination of the MTC and for core flow estimation.

TL;DR: In this article, the axial flux oscillations in PWRs were described by means of the Onega and Kisner model (1978), a two-point xenon oscillation model based on the one-group, one-dimensional neutron diffusion equation with nonlinear power reactivity feedback and on the nonlinear xenon and iodine balance equations.

TL;DR: The results of the calibration of a plastic scintillator using a Cf-252 source are presented, showing that the physical parameters found by calibration and used in the MCNP-PoliMi simulations are reasonable for this type of detector, and that the correlation functions thereby obtained are in good agreement with the experiment.

TL;DR: An early progress is reported of a feasibility study of a computational intelligence approach to the enhancement of the accuracy of flow measurements in the framework of an ongoing cooperation between Tecnatom s.a. and the OECD Halden Reactor Project.

TL;DR: In this article, the vibration characteristics of a Korean standard PWR reactor internals have been estimated through a three-dimensional finite element analyses and verified by using the mode separated power spectral density functions obtained from the ex-core neutron noise signals.

TL;DR: In this paper, the authors proposed a "wait and see" policy for spent fuel management, and several alternative studies have been carried out, such as DUPIC and this paper.