scholarly journals Distribution and risk assessment of natural radioactive elements in volcanic ashes, cold lava, river waters due to volcanic eruption of Mount Sinabung

2021 ◽  
Author(s):  
Saur Lumban Raja ◽  
Harlem Marpaung ◽  
Saudin Simanjuntak ◽  
Crystina Simanjuntak ◽  
Eko Pudjadi
Keyword(s):  
Risk Assessment ◽  
Volcanic Eruption ◽  
Radioactive Elements ◽  
River Waters ◽  
Volcanic Ashes

Statistical analysis of the volcanic eruption frequency in the azores islands : a contribution to risk assessment

2005 ◽  
Vol 176 (1) ◽  
pp. 107-120 ◽  
Author(s):  
Guy Caniaux
Keyword(s):  
Risk Assessment ◽  
Statistical Analysis ◽  
Poisson Distribution ◽  
Volcanic Eruption ◽  
Eruption Frequency ◽  
Azores Islands ◽  
Active Volcanoes

Abstract The datations of the last eruptive events which have occurred on 13 active volcanic complexes of the Azores are presented. By supposing that these events follow a statistical Poisson distribution, we estimate the occurrence period of these events, as well as the eruption probabilities for the next 300 years. Pico Mountain, Região dos Picos (São Miguel Island), the stratovolcano of Sete Cidades (São Miguel Island), the linear volcanic complexes of São Roque – Piedade (Pico Island) and of Capelo (Faial Island) must be considered as the most active volcanoes of the archipelago. The eruption styles of next eruptions are also specified.

Development of Probabilistic Risk Assessment Methodology Against Volcanic Eruption for Sodium-Cooled Fast Reactors

2017 ◽  
Vol 4 (3) ◽  
Author(s):  
Hidemasa Yamano ◽  
Hiroyuki Nishino ◽  
Kenichi Kurisaka ◽  
Takahiro Yamamoto
Keyword(s):  
Risk Assessment ◽  
Failure Probability ◽  
Volcanic Eruption ◽  
Heat Removal ◽  
Probabilistic Risk Assessment ◽  
Sensitivity Analyses ◽  
Fast Reactors ◽  
Decay Heat ◽  
Volcanic Tephra ◽  
Probabilistic Risk

The objective of this paper is to develop a probabilistic risk assessment (PRA) methodology against volcanic eruption for decay heat removal function of sodium-cooled fast reactors (SFRs). In the volcanic PRA methodology development, only the effect of volcanic tephra (pulverized magma) is taken into account, because there is a great distance between a plant site assumed in this study and volcanoes. The volcanic tephra (ash) could potentially clog air filters of air-intakes that are essential for the decay heat removal. The degree of filter clogging can be calculated by atmospheric concentration of ash and tephra fallout duration and also suction flow rate of each component. This study evaluated a volcanic hazard using a combination of tephra fragment size, layer thickness, and duration. In this paper, functional failure probability of each component is defined as a failure probability of filter replacement obtained by using a grace period to filter failure. Finally, based on an event tree, a core damage frequency has been estimated by multiplying discrete hazard frequencies by conditional decay heat removal failure probabilities. A dominant sequence has been identified as well. In addition, sensitivity analyses have investigated the effects of a tephra arrival reduction factor and prefilter covering.

Risk assessment in dentistry

1998 ◽  
Vol 62 (10) ◽  
pp. 756-761 ◽  
Author(s):  
CW Douglass
Keyword(s):  
Risk Assessment
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