Parametric study of the influence of $^{135}$Xe build-up on required excess reactivity for load-following operations

Žerovnik, Gašper (avtor), Levpušček, Blaž (avtor), Snoj, Luka (avtor)

An analytical model was used to study the effect of $^{135}$Xe build-up after reactor shutdown on reactor reactivity, with implications on possible restrictions for reactor operation in the load-following mode. The parameters of the analytical model were estimated using a 2D Serpent Monte Carlo unit-cell model of a typical pressurised water reactor and ENDF/B-VII.1 nuclear data library. Parametric studies to fuel composition, boron concentration in the moderator, and moderator-to-fuel volume ratio were performed. Mixed-oxide fuel has a smaller impact on reactivity decrease than UO$_2$ fuel due to $^{135}$Xe after reactor shutdown and is therefore more suitable for load-following operations. For UO$_2$, higher initial $^{235}$U enrichment is beneficial for the same reason. Similarly, higher boron concentration and less moderated neutron spectrum lead to a less pronounced $^{135}$Xe effect on reactivity. The methodology is general and may in principle be expanded to other operational parameters, fuel and reactor types.

• Jezik: Angleški jezik
• Ključne besede: excess reactivity, xenon-135, neutron absorption, Monte Carlo method
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: 10 str.
• Številčenje: Vol. 424, art. 113297
• PID: 20.500.12556/RUL-160099
• UDK: 539.1
• ISSN pri članku: 0029-5493
• DOI: 10.1016/j.nucengdes.2024.113297
• COBISS.SI-ID: 204158979
• Datum objave v RUL: 20.08.2024

Gradivo je del revije

• Naslov: Nuclear engineering and design
• Skrajšan naslov: Nucl. eng. des.
• Založnik: Elsevier
• ISSN: 0029-5493
• COBISS.SI-ID: 5246730

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: jedrska fizika, poskusni reaktor

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: L2-2612
• Naslov: Stabilnost jedrskih reaktorjev pri obratovanju v načinu sledenja bremenu

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0073
• Naslov: Reaktorska fizika