Monte Carlo sensitivity analysis method for the effective delayed neutron fraction with the differential operator sampling method

Yamamoto, Toshihiro; Sakamoto, Hiroki

doi:10.1016/j.anucene.2019.107108

Cited by 8 publications

(5 citation statements)

References 36 publications

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“…The Global Sensitivity Analysis technique that Nossent et al [59] created was utilized to complete the task. This technique uses variance decomposition to generate sensitivity indices for variables [60].…”

Section: Sensitivity Analysismentioning

confidence: 99%

Relative Influence of Meteorological Variables of Human Thermal Stress in Peninsular Malaysia

Houmsi,

Ismail,

Ziarh

et al. 2023

Sustainability

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Climate change has significantly increased human thermal stress, particularly in tropical regions, exacerbating associated risks and consequences, such as heat-related illnesses, decreased workability, and economic losses. Understanding the changes in human thermal stress and its drivers is crucial to identify adaptation measures. This study aims to assess various meteorological variables’ spatial and seasonal impact on Wet Bulb Globe Temperature (WBGT), an indicator of human thermal stress, in Peninsular Malaysia. The Liljegren method is used to estimate WBGT using ERA5 hourly data from 1959 to the present. The trends in WBGT and its influencing factors are evaluated using a modified Mann-Kendall test to determine the region’s primary driver of WBGT change. The results indicate that air temperature influences WBGT the most, accounting for nearly 60% of the variation. Solar radiation contributes between 20% and 30% in different seasons. Relative humidity, zenith, and wind speed have relatively lesser impacts, ranging from −5% to 20%. Air temperature has the highest influence in the northern areas (>60%) and the lowest in the coastal regions (40%). On the other hand, solar radiation has the highest influence in the southern areas (20–40%) and the least in the north. The study also reveals a significant annual increase in temperature across all seasons, ranging from 0.06 to 0.24 °C. This rapid temperature rise in the study area region has led to a substantial increase in WBGT. The higher increase in WBGT occurred in the coastal regions, particularly densely populated western coastal regions, indicating potential implications for public health. These findings provide valuable insights into the factors driving WBGT and emphasize the importance of considering air temperature as a key variable when assessing heat stress.

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Section: Sensitivity Analysismentioning

confidence: 99%

Relative Influence of Meteorological Variables of Human Thermal Stress in Peninsular Malaysia

Houmsi,

Ismail,

Ziarh

et al. 2023

Sustainability

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“…The effective delayed neutron fraction (β eff ) [19] and the effective neutron generation time (Λ eff ) [19] are used as essential reactor parameters, and studying them can provide deeper insight into the core performance. The delayed neutron fraction is the total fraction of delayed neutrons in the total fission neutrons.…”

Section: Effective Delayed Neutron Fraction and Neutron Generation Timementioning

confidence: 99%

“…The reactor temperature coefficient is required to be negative in reactor design to ensure safe reactor operation. Researchers have calculated negative temperature reactivity Energies 2023, 16, 7549 2 of 19 coefficients to demonstrate that new reactors are inherently safe [4,5]. The AP1000, as an advanced pressurized water reactor developed with existing operating regimes, always has a negative temperature reactivity factor to maintain its inherent safety.…”

Section: Introductionmentioning

confidence: 99%

“…The delayed neutron can maintain the critical controllability of the reactor. Currently, a large quantity of studies are devoted to the calculation of the effective delayed neutron fraction and uncertainty [18][19][20]. This is because nuclear reactor dynamics are largely influenced by the proportion of delayed neutrons in the total number of neutrons per fission.…”

Section: Introductionmentioning

confidence: 99%

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Research on Neutronics Safety Parameters of the AP1000 Nuclear Reactor under Different Conditions

Niu,

Liu,

Dong

et al. 2023

Energies

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Changes in temperature during reactor operation may cause changes in physical parameters, leading to core overheating and accidents. It is essential to analyze and assess the safety parameters of the core under different operating conditions. This paper investigates the effects of fuel temperature, moderator density, boron concentration, and control rod state on AP1000 safety parameters. The study uses RMC and NJOY to calculate the changes in reactivity factor, effective delayed neutron fraction, and neutron generation time of the AP1000 reactor under different operating conditions. The changes in reactivity coefficients, neutron fluxes, and relative power densities of AP1000 reactors are analyzed for normal and accidental operating conditions. The results indicated that the reactivity coefficient remained negative under accident conditions, which ensured the safe operation of the reactor. The delayed neutron fraction, neutron flux, and power density distributions are affected by fuel temperature, moderator density, and control rod position. The control rod worth was sufficient for the emergency shutdown of the reactor under accidental conditions. It is demonstrated that the operation of the AP1000 reactor under study conditions is safe and controllable.

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“…In recent years, the continuous development of science and technology has led to the emergence of many high-tech enterprises. e importance of the measurement of intangible assets has become more and more prominent [1,2]. ese nonphysical assets bring about considerable profits to enterprises and play an essential role in the activities of creating corporate value [3,4].…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Management of Intangible Assets of High-Tech Enterprises from the Perspective of Monte Carlo and Network Security

Wan

2021

Mobile Information Systems

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High-tech enterprises are knowledge- and technology-intensive economic entities. These entities are considered intangible assets and an essential part of the enterprises. The fast and effective development of high-tech enterprises requires scientific evaluation of intangible assets. Therefore, the evaluation of intangible assets of high-tech enterprises has become more significant in the evaluation industry. This article uses the Monte Carlo method to evaluate the intangible assets of high-tech enterprises from the perspective of network security. This paper combines the weighted average cost of capital (WACC) with the capital asset pricing model (CAPM) to determine the rate of return. It uses the analytic hierarchy process (AHP) method to determine the weight. It determines the value of various intangible assets based on the contribution of various intangible assets to the overall intangible asset value. Moreover, the Monte Carlo model is used in the probability determination process to evaluate intangible assets. In practical applications of a high-tech enterprise, the advancement and practicability of this method are verified by comparing it with the income method.

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Monte Carlo sensitivity analysis method for the effective delayed neutron fraction with the differential operator sampling method

Cited by 8 publications

References 36 publications

Relative Influence of Meteorological Variables of Human Thermal Stress in Peninsular Malaysia

Relative Influence of Meteorological Variables of Human Thermal Stress in Peninsular Malaysia

Research on Neutronics Safety Parameters of the AP1000 Nuclear Reactor under Different Conditions

Evaluation and Management of Intangible Assets of High-Tech Enterprises from the Perspective of Monte Carlo and Network Security

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