Fast two parametric spectrometric system for experimental reactor dosimetry

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Fast two parametric spectrometric system for experimental reactor dosimetry

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Fast two parametric spectrometric system for experimental reactor dosimetry

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

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

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

ASTM Special Technical Publication Volume STP 1608, 2018

ISBN

978-080317661-4

ISSN

0066-0558

e-ISSN

—

Počet stran výsledku

11

Strana od-do

63-73

Název nakladatele

ASTM International

Místo vydání

—

Místo konání akce

Santa Fe, USA

Datum konání akce

7. 5. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000474939900006