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doctoral thesis
Modeliranje brzine doza komponenata primarnog kruga tlakovodnog reaktora primjenom hibridne determinističko-stohastičke metodologije
Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing, 2013. urn:nbn:hr:168:432189
Matijević, Mario
University of Zagreb
Faculty of Electrical Engineering and Computing
Department of Applied Physics

Institutional repository: FER Repository

Cite this document

Matijević, M. (2013). Modeliranje brzine doza komponenata primarnog kruga tlakovodnog reaktora primjenom hibridne determinističko-stohastičke metodologije (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing. Retrieved from https://urn.nsk.hr/urn:nbn:hr:168:432189

Matijević, Mario. "Modeliranje brzine doza komponenata primarnog kruga tlakovodnog reaktora primjenom hibridne determinističko-stohastičke metodologije." Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, 2013. https://urn.nsk.hr/urn:nbn:hr:168:432189

Matijević, Mario. "Modeliranje brzine doza komponenata primarnog kruga tlakovodnog reaktora primjenom hibridne determinističko-stohastičke metodologije." Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, 2013. https://urn.nsk.hr/urn:nbn:hr:168:432189

Matijević, M. (2013). 'Modeliranje brzine doza komponenata primarnog kruga tlakovodnog reaktora primjenom hibridne determinističko-stohastičke metodologije', Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, accessed 21 December 2024, https://urn.nsk.hr/urn:nbn:hr:168:432189

Matijević M. Modeliranje brzine doza komponenata primarnog kruga tlakovodnog reaktora primjenom hibridne determinističko-stohastičke metodologije [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing; 2013 [cited 2024 December 21] Available at: https://urn.nsk.hr/urn:nbn:hr:168:432189

M. Matijević, "Modeliranje brzine doza komponenata primarnog kruga tlakovodnog reaktora primjenom hibridne determinističko-stohastičke metodologije", Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, 2013. Available at: https://urn.nsk.hr/urn:nbn:hr:168:432189

Metadata
TitleModeliranje brzine doza komponenata primarnog kruga tlakovodnog reaktora primjenom hibridne determinističko-stohastičke metodologije
Title (english)Dose rates modelling of pressurized water reactor primary loop components by hybrid deterministic- stochastic methodology
AuthorMario Matijević
MentorDubravko Pevec (mentor)
Committee memberDubravko Pevec (predsjednik povjerenstva)
GranterUniversity of Zagreb
Faculty of Electrical Engineering and Computing
(Department of Applied Physics)
Zagreb
Defense date and country2013-05-28, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Electrical Engineering
Universal decimal classification
(UDC)		621.3 - Electrical engineering
Abstract
U disertaciji je razvijen 3D simulacijski model primarnog kruga tlakovodnog reaktora PWR tipa (Pressurized Water Reactor) za efikasan proračun brzina doza koji se temelji na hibridnoj determinističko-stohastičkoj metodologiji. Provedena je analiza kritičnosti i proračun štita reaktora, primarnog kruga i zaštitne zgrade korištenjem CSAS6 i MAVRIC sekvence SCALE6.0 programskog paketa. Razvijen je detaljan model kombinatorne geometrije, materijala i karakteristika PWR postrojenja na temelju najboljih dostupnih podataka. Izvori ionizirajućeg zračenja komponenti primarnog kruga su uključili neutrone i fotone iz kritične jezgre reaktora te fotone od aktivacije primarnog hladioca kroz dvije rashladne petlje. Provedena je verifikacija razvijenog modela tehnikom plavljenja (flooding) te njegova parcijalna validacija usporedbom brzina nuklearnih reakcija s referentnim rezultatima H.B.Robinson-2 testnog primjera. Promotrena je mogućnost boriranja biološkog štita reaktora s prirodnim borom i borovim karbidom (B4C) u svrhu smanjenja emisije sekundarnog gama zračenja nastalog procesom radijativnog uhvata termaliziranih neutrona. Utvrđena je potrebna količina prirodnog bora koja dovodi do zasićenja u atenuacijskoj moći boriranog betona za smanjenje tokova čestica i doza. Analizirana je raspodjela i atenuacija brzina doza kroz elemente primarnog kruga unutar velikih struktura zaštitne zgrade fleksibilnim opisom adjungiranog izvora. Istražena je korisnost u definiciji materijalnih značajki adjungiranog izvora, kada se transport čestica dodatno usmjeruje u regije s materijalima od interesa. Kvantificirana je prednost FW-CADIS metodologije u odnosu na CADIS metodologiju i manualne tehnike redukcije varijance u MAVRIC sekvenci. Dane su preporuke za optimizaciju kontrolnih i numeričkih parametara MAVRIC sekvence u hibridnoj FW-CADIS metodologiji u svrhu efikasnog Monte Carlo modeliranja kompleksnog modela. Znanstveni doprinosi su: (1) razvijena je simulacijska procedura za određivanje brzine doza komponenti primarnog kruga reaktora bazirana na hibridnoj determinističko-stohastičkoj metodi; (2) određena je potrebna količina prirodnog bora biološkog štita reaktora za smanjenje sekundarne gama emisije; (3) optimizacija kontrolnih i numeričkih parametara hibridne metode za efikasan Monte Carlo proračun brzine doza unutar velikih struktura; (4) kvantifikacija prednosti FW-CADIS metode u odnosu na CADIS i manualne tehnike za redukciju varijance unutar MAVRIC sekvence.
Abstract (english)
A 3D simulation model of pressurized water reactor (PWR) primary loop components for effective dose rates calculation based on hybrid deterministic-stochastic methodology was developed in proposed dissertation. Criticality and shielding calculations were performed using CSAS6 and MAVRIC sequences of SCALE6.0 code package. A detailed model of a combinatorial geometry, materials and characteristics of a PWR facility was based on best available input data. The sources of ionizing radiation in PWR primary loop components included neutrons and photons originating from critical core and photons from activated coolant in two primary loops. Validation and partial verification of proposed model were performed with flooding technique and with comparison of reaction rates to referenced H.B.Robinson-2 benchmark results. The reduction of secondary gamma emissions from radiative capture of thermalized neutrons in biological shield was examined via concrete boration with natural boron and boron carbide (B4C). Optimal boron concentration which leads to saturation of flux and dose rates attenuation was proposed. Distribution and attenuation of dose rates through large structures of containment building were analysed by flexible definition of adjoint source. The benefits of adjoint source definition with focus on material characteristics of a model was examined. Advantage of using FW-CADIS methodology over CADIS and manual variance reduction techniques inside MAVRIC shielding sequence has been quantified. Recommendations for optimal control and numerical parameters of a MAVRIC sequence with hybrid FW-CADIS methodology were given for effective Monte Carlo deep penetration shielding calculation. Scientific contributions are: (1) simulation procedure was developed to determine primary loop components dose rates based on a hybrid deterministic-stochastic method; (2) the required amount of natural boron was determined for reducing secondary gamma emissions inside biological shied; (3) control and numerical parameters of a MAVRIC sequence with hybrid methodology were optimized for effective Monte Carlo deep penetration shielding calculation; (4) advantage of using FW-CADIS methodology over CADIS and manual variance reduction techniques inside MAVRIC shielding sequence was quantified.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:168:432189
ProjectNumber: 036-0361590-1579
Title: Gospodarenje gorivom standardnih i naprednih nuklearnih reaktora
Leader: Dubravko Pevec
Jurisdiction: Croatia
Funder: MZOS
Funding stream: ZP
Study programmeTitle: Doctoral study programme "Electrical Engineering and Computing"
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, po-dručje tehničkih znanosti (doktor/doktorica znanosti, po-dručje tehničkih znanosti)
Catalog URLhttp://lib.fer.hr/cgi-bin/koha/opac-detail.pl?biblionumber=41287
Type of resourceText
Extent195 str ; 30 cm
File originBorn digital
Access conditionsClosed access
Terms of useLicence In copyright icon
Created on2019-11-27 13:02:28