sidelined issues in the current framework of the nuclear ...25 n Ê $Î7Á d b!f £ s8j0Û o ö = @...
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Sidelined Issues in the Current Framework of the Nuclear Power
Plant Safety Rules for Volcanic Risk Evaluation
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1
Makoto Murakami1
1 Institute of Seismology and Volcanology, Hokkaido University
Abstract
The nuclear disaster at Fukushima in 2011 gave rise to a large scale reformation of entire framework
of Japanese nuclear plant safety rules and regulations. Being part of this total restructuring of
nuclear plant safety rulings, a regulatory suite to take care of the volcanic risks on plants was newly
compiled and put into operation. This was the first time that such regulations dealing with volcanic
risk on nuclear plants were enacted in Japan. Although it is a certain progress that a fair treatment
for volcanic risks is authorized, the new regulatory suite still leaves some important issues sidelined.
Among those, this article pays particular attentions to necessities of fare treatment of floating pumice
raft posing threats on cooling water intake system and of introduction of probabilistic risk
assessment (PRA) methodology into volcanic risk evaluation.
Key Words: Nuclear Power Plant Risk Assessment, Volcanic hazard, Probabilistic Risk
Assessment (PRA), Pumice Raft
2011 3 M9
北海道地区自然災害科学資料センター報告Vol.32, 25-36, 2019
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ATOMICA, 2019 I
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PRA: Probabilistic Risk Assessment PRA ,, ,
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PRA 2017
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Havre 2012 7
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JEAG4625 20152015 3.4.2
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3)
4)
5) (2017a)
http://www.nsr.go.jp/data/000213308.pdf ( 2019/01/23)
6) (2015 2015 2 9
.https://criepi.denken.or.jp/jp/serc/denki/pdf/20150209.pdf 2019/01/23
7) (2017b
http://www.nsr.go.jp/data/000183879.pdf 2019/01/23
8) M. Jutzeler, R. Marsh, R.J. Carey, J.D. White, P.J. Talling, L. Karlstrom (2014): On the fate of pumice
rafts formed during the 2012 Havre submarine eruption, Nat. Commun., 5 (2014),
10.1038/ncomms4660
9) T. Simkin and R. S. Fiske (1983), Krakatau 1883 the volcanic eruption and its effects, Smithsonian
Institution press, p292.
10) 2009
11) (1927) 10 pp1-42
12) (1930) 2 pp105-112
13) 2015 : JEAG4625