scholarly journals THE EFFECT OF REACTIVITY MODULATION AMPLITUDE ON MEASUREMENT OF THE REACTOR TRANSFER FUNCTION

1956 ◽  
Author(s):  
L Barrett
Keyword(s):  
Transfer Function ◽  
Modulation Amplitude ◽  
Reactor Transfer ◽  
Reactivity Modulation

Localization of a Noise Source in VVER-1000 Reactor Core Using Neutron Noise Analysis Methods

2010 ◽  
Author(s):  
Hessam Malmir ◽  
Naser Vosoughi ◽  
Ehsan Zahedinejad
Keyword(s):  
Transfer Function ◽  
Noise Source ◽  
Noise Analysis ◽  
Reactor Core ◽  
Dynamic State ◽  
Inversion Method ◽  
Variable Strength ◽  
Neutron Noise ◽  
Spatial Discretisation ◽  
Reactor Transfer

In this paper, localization of a noise source from limited neutron detectors sparsely distributed throughout the core of a typical VVER-1000 reactor is investigated. For this purpose, developing a 2-D neutron noise simulator for hexagonal geometries based on the 2-group diffusion approximation, the reactor dynamic transfer function is calculated. The box-scheme finite difference method is first developed for hexagonal geometries, to be used for spatial discretisation of both 2-D 2-group static and noise diffusion equations. The dynamic state is assumed in the frequency domain which leads to discarding of the time disrcetisation. The developed 2-D 2-group neutron noise simulator calculates both the discretised forward and the adjoint reactor transfer function between a point-like source and its induced neutron noise, by assuming the noise source as an absorber of variable strength type. Benchmarking of the mentioned neutron noise simulator revealed that it works satisfactorily. Finally, by using the inversion method of reconstruction, the location and values of a noise source of the type absorber of variable strength (or reactor oscillator) in VVER-1000 reactor cores are determined. Accuracy of this method is highly acceptable.

scholarly journals EXPERIMENTAL DETERMINATION OF THE ZERO POWER TRANSFER FUNCTION OF THE AKR-2

2021 ◽  
Vol 247 ◽  
pp. 21009
Author(s):  
Sebastian Hübner ◽  
Alexander Knospe ◽  
Marco Viebach ◽  
Carsten Lange ◽  
Antonio Hurtado
Keyword(s):  
Lower Bound ◽  
Transfer Function ◽  
Neutron Flux ◽  
Basic Characteristic ◽  
Nuclear Reactor ◽  
Power Reactor ◽  
Plateau Region ◽  
Reactor Transfer ◽  
Good Agreement

The transfer function is a basic characteristic of every nuclear reactor. It describes how a perturbation at a given place and time influences the neutron flux. In case of a known perturbation, the determination of characteristic reactor parameters is possible. The present paper shows an experimental method to determine the gain of the zero-power reactor transfer function (ZPTF) of the AKR-2 reactor at TU Dresden and the comparison to the theoretical shape of the ZPTF derived from kinetic parameters simulated with MCNP. For the experiments, a high-precision linear motor axis is used to insert an oscillating perturbation acting at frequencies smaller than the lower bound of the plateau region of the ZPTF. For higher frequencies, a rotating absorber is used. This device emulates an absorber of variable strength. The reactor response is detected with a He-3 counter. The data evaluation shows good agreement between measured and corresponding theoretical values of the gain of the ZPTF.

scholarly journals Review of kinetic modulation experiments in low power nuclear reactors

2020 ◽  
Vol 6 ◽  
pp. 55
Author(s):  
Yifeng Jiang ◽  
Benoit Geslot ◽  
Vincent Lamirand ◽  
Pierre Leconte
Keyword(s):  
Transfer Function ◽  
Kinetic Parameters ◽  
Nuclear Reactors ◽  
Function Analysis ◽  
Noise Analysis ◽  
Reactor Physics ◽  
Reactor Stability ◽  
Safety Improvement ◽  
Transfer Function Analysis ◽  
Reactor Transfer

The safety improvement of nuclear reactors requires continuous efforts in understanding the fundamental physical quantities related to the fission process. In neutronic models, the reactor dynamics is covered by the kinetic parameters to characterize the temporal behavior of the neutron population subject to perturbations. The reactor transfer function is a frequency domain analogy of this temporal description. It can be measured experimentally through transfer function analysis via noise analysis or kinetic modulation, for the study of reactor stability and kinetic parameters. This paper summarizes the experimental measurements of reactor transfer function through kinetic modulation. Extensive work have been conducted experimentally, starting from the beginning of reactor physics research. An overview is given regarding various experimental designs and conducted analyses. The concepts of the modulation system are also discussed. The current work is limited to online contents and internal archives of CEA Cadarache due to difficulties in accessing references traced back to 1950s.

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