Gamma-ray spectrometric measurements of fission rate ratios between fresh and burnt fuel following irradiation in a zero-power reactor

2013 ◽  
Vol 698 ◽  
pp. 72-80 ◽  
Author(s):  
H. Kröhnert ◽  
G. Perret ◽  
M.F. Murphy ◽  
R. Chawla
Keyword(s):  
Gamma Ray ◽  
Power Reactor ◽  
Fission Rate ◽  
Spectrometric Measurements ◽  
Rate Ratios

scholarly journals Power Distribution and Possible Influence on Fuel Failure in WWER-1000

2008 ◽  
Vol 2008 ◽  
pp. 1-5
Author(s):  
Ján Mikuš
Keyword(s):  
Experimental Data ◽  
Fuel Assembly ◽  
Power Distribution ◽  
Power Reactor ◽  
Construction Materials ◽  
Static Loads ◽  
Fission Rate ◽  
Light Water ◽  
Fuel Failure ◽  
Fuel Pin

The work is focused on the influence of investigation of some core heterogeneities and construction materials on the space power (fission rate) distribution in WWER-1000-type cores, especially from viewpoint of the values and gradient occurrence that could result in static loads with some consequences, for example, fuel pin (FP) or fuel assembly (FA) bowing and possible contribution to the FP failure root causes. For this purpose, experimental data and their analysis from two earlier performed measurements on light water, zero-power reactor LR-0 were used, concerning the relative radial power distribution determined by measurements in a WWER-1000-type core containing single FPs with homogeneous gadolinium admixture () and the relative radial power distribution determined by measurements in FA situated on the periphery of a WWER-1000-type core neighbouring the baffle (thermal shielding).

Measurements of Structural Material Capture to Uranium-235 Fission Rate Ratios in an Intermediate Spectrum Assembly

1980 ◽  
Vol 76 (1) ◽  
pp. 70-77 ◽  
Author(s):  
P. Azzoni ◽  
V. Benzi ◽  
A. Salomoni ◽  
P. L. Chiodi ◽  
C. Giuliani ◽  
...  
Keyword(s):  
Structural Material ◽  
Fission Rate ◽  
Rate Ratios

scholarly journals First in-core gamma spectroscopy experiments in a zero power reactor

2021 ◽  
Vol 253 ◽  
pp. 04022
Author(s):  
Oskari Pakari ◽  
Vincent Lamirand ◽  
Tom Mager ◽  
Axel Laureau ◽  
Pavel Frajtag ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Nuclear Reactions ◽  
Power Reactor ◽  
Gamma Spectroscopy ◽  
Reactor Core ◽  
Pulse Height ◽  
Nuclear Data ◽  
Federal Institute ◽  
Institute Of Technology

Gamma rays in nuclear reactors, arising either from nuclear reactions or decay processes, significantly contribute to the heating and dose of the reactor components. Zero power research reactors offer the possibility to measure gamma rays in a purely neutronic environment, allowing for validation experiments of dose estimates, computed spectra, and prompt to delayed gamma ratios. The resulting data can contribute to models, code validation and photo atomic/nuclear data evaluation. To date, most experiments have relied on flux measurements using TLDs, ionization chambers, or spectrometers set in low flux areas. The CROCUS reactor allows for flexible detector placement in and around the core, and has recently been outfitted with gamma detection capabilities to fulfill the need for in-core gamma spectroscopy, as opposed to flux. In this paper we report on the experiments and accompanying simulations of gamma spectrum measurements inside a zero power reactor core, CROCUS. It is a two-zone, uranium-fueled light water moderated facility operated by the Laboratory for Reactor Physics and Systems Behaviour (LRS) at the Swiss Federal Institute of Technology Lausanne (EPFL). Herein we also introduce, in detail, the new LEAF system: A Large Energy-resolving detection Array for Fission gammas. It consists of an array of four detectors – two large ø 127 254 mm Bismuth Germanate (BGO) and two smaller ø 12 50 mm Cerium Bromide (CeBr3) scintillators. We describe the calibration and characterization of LEAF followed by first in-core measurements of gamma ray spectra in a zero power reactor at different sub-critical and critical states, and different locations. The spectra are then compared to code results, namely MCNP6.2 pulse height tallies. We were able to distinguish prompt processes and delayed peaks from decay databases. We present thus experimental data from hitherto inaccessible core regions. We provide the data as validation means for codes that attempt to model these processes for energies up to 10 MeV. We finally draw conclusions and discuss the future uses of LEAF. The results indicate the possibility of isotope tracking and burn-up validation.

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