Investor Presentaiton
NRA, Japan
Nuclear Regulation Authority
New Regulatory Requirements:
Measures against Extreme Natural Phenomena
■ In order to prevent common cause failure, it is required to
take measures against volcano eruption, tornadoes and
forest fire, postulating severe conditions.
■ Example: Review Guide for Impacts of
Phenomena
■ Assess the possibility that "severe volcanic
phenomena which design cannot cope
with" reach to the site during the plant life.
Even if the possibility is small, it is
required to conduct monitoring
and develop policy on reactor
shutdown, fuel unloading, etc.
when volcanic unrest is identified.
IAEA SSG-21 "Volcanic Hazards
in Site Evaluation” gave us
valuable inputs.
10
Radius 160 km
白山
A
FREE
NPP
Pyroclastic flows
at Mayon Volcano Philippines, 1984
http://en.wikipedia.org/wiki/File:Pyroclastic_flows_at_Mayon_Volcano.jpgView entire presentation