Ethan Fowler , Ryan Stewart , Paolo Balestra , Benjamin Lindley , Gerhard Strydom
{"title":"通用球床反应器(GPBR-200)磨合过程参数研究","authors":"Ethan Fowler , Ryan Stewart , Paolo Balestra , Benjamin Lindley , Gerhard Strydom","doi":"10.1016/j.anucene.2025.111719","DOIUrl":null,"url":null,"abstract":"<div><div>The run-in period of a pebble-bed reactor is complex and difficult to model given significant heterogeneity in core composition, power, and temperature. While the initial core composition should eventually result in the same equilibrium core composition, the approach to equilibrium can vary significantly depending on factors such as startup fuel enrichment and power ramp rate. To explore this, we used a high-fidelity model of the General Pebble Bed Reactor to vary power ramp schemes and startup core compositions. Both the initial core composition and power ramp rate had a significant impact on the flow rate of pebbles during early time steps, with higher ramp rates and low enrichment resulting in non-physical flow rates. Power ramp rate alone was found to dictate the maximum pebble power peaking observed during the run-in process, with higher ramp rates resulting in greater peak pebble powers. Startup fuel enrichment and power ramp were found to both impact total fuel consumption, although the impact of startup fuel enrichment was generally secondary to ramp rate.</div></div>","PeriodicalId":8006,"journal":{"name":"Annals of Nuclear Energy","volume":"225 ","pages":"Article 111719"},"PeriodicalIF":2.3000,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Parameter study of the running-in process for the Generic Pebble Bed Reactor (GPBR-200)\",\"authors\":\"Ethan Fowler , Ryan Stewart , Paolo Balestra , Benjamin Lindley , Gerhard Strydom\",\"doi\":\"10.1016/j.anucene.2025.111719\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The run-in period of a pebble-bed reactor is complex and difficult to model given significant heterogeneity in core composition, power, and temperature. While the initial core composition should eventually result in the same equilibrium core composition, the approach to equilibrium can vary significantly depending on factors such as startup fuel enrichment and power ramp rate. To explore this, we used a high-fidelity model of the General Pebble Bed Reactor to vary power ramp schemes and startup core compositions. Both the initial core composition and power ramp rate had a significant impact on the flow rate of pebbles during early time steps, with higher ramp rates and low enrichment resulting in non-physical flow rates. Power ramp rate alone was found to dictate the maximum pebble power peaking observed during the run-in process, with higher ramp rates resulting in greater peak pebble powers. Startup fuel enrichment and power ramp were found to both impact total fuel consumption, although the impact of startup fuel enrichment was generally secondary to ramp rate.</div></div>\",\"PeriodicalId\":8006,\"journal\":{\"name\":\"Annals of Nuclear Energy\",\"volume\":\"225 \",\"pages\":\"Article 111719\"},\"PeriodicalIF\":2.3000,\"publicationDate\":\"2025-07-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Annals of Nuclear Energy\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0306454925005365\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"NUCLEAR SCIENCE & TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Annals of Nuclear Energy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0306454925005365","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
Parameter study of the running-in process for the Generic Pebble Bed Reactor (GPBR-200)
The run-in period of a pebble-bed reactor is complex and difficult to model given significant heterogeneity in core composition, power, and temperature. While the initial core composition should eventually result in the same equilibrium core composition, the approach to equilibrium can vary significantly depending on factors such as startup fuel enrichment and power ramp rate. To explore this, we used a high-fidelity model of the General Pebble Bed Reactor to vary power ramp schemes and startup core compositions. Both the initial core composition and power ramp rate had a significant impact on the flow rate of pebbles during early time steps, with higher ramp rates and low enrichment resulting in non-physical flow rates. Power ramp rate alone was found to dictate the maximum pebble power peaking observed during the run-in process, with higher ramp rates resulting in greater peak pebble powers. Startup fuel enrichment and power ramp were found to both impact total fuel consumption, although the impact of startup fuel enrichment was generally secondary to ramp rate.
期刊介绍:
Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.