Fast two parametric spectrometric system for experimental reactor dosimetry

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F18%3AN0000165" target="_blank" >RIV/26722445:_____/18:N0000165 - isvavai.cz</a>

Result on the web

<a href="https://www.astm.org/DIGITAL_LIBRARY/STP/PAGES/STP160820170129.htm" target="_blank" >https://www.astm.org/DIGITAL_LIBRARY/STP/PAGES/STP160820170129.htm</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1520/STP160820170129" target="_blank" >10.1520/STP160820170129</a>

Result language

angličtina

Original language name

Fast two parametric spectrometric system for experimental reactor dosimetry

Original language description

The neutron fluence load in structural components of reactor systems is crucial for the issues of reactor dosimetry. The neutron spectrum in construction parts of light water reactor systems is modified by water and iron, whereas the spectrum in advanced molten salt / fluoride salt (MSR/FHR) reactor systems is shifted by fluoride salts and graphite. The majority of commercial nuclear power plants are light water reactors, where the neutron spectra were examined many times. In case of progressive technologies, as MSR/FHR, neutron spectra are measured only rarely. Therefore, a series of experiments were performed in LR-0 reactor in order to analyze the effect of graphite and fluorides on neutron spectrum . New digital two parametric spectrometric system was developed for the purpose of neutron spectrum measurements. This system processes digitized data from scintillation detectors. It uses several channels with different amplification to achieve wider energy range. Each channel is sampled with 1 GS/s 12 bit digitizer. With the help of FPGA chip this system can process high number of pulses (>10^5 s-1). The advantage of this system is minimization of dead time and implementation of online algorithms for separation of neutron and gamma pulses. The output of this spectrometric system is then neutron and gamma spectrum. The system can be remotely controlled over Ethernet connection. A series of experiments was performed with this digital spectrometric system in fluoride salt (FLINA) or graphite inserted into the central channel of LR-0 reactor. There seems to be a good agreement for graphite between experiment and calculation, however a significant discrepancy in case of FLINA was observed, especially in low energy region. Our two parametric spectrometric system brings a benefit for measurements in experimental reactors due to the acceptable energy resolution and faster data processing. The results are important not only for reactor dosimetry but also for calculation of criticality safety in fuel fabrication facilities.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20305 - Nuclear related engineering; (nuclear physics to be 1.3);

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

ASTM Special Technical Publication Volume STP 1608, 2018

ISBN

978-080317661-4

ISSN

0066-0558

e-ISSN

—

Number of pages

11

Pages from-to

63-73

Publisher name

ASTM International

Place of publication

—

Event location

Santa Fe, USA

Event date

May 7, 2017

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000474939900006