Former General Motors engineer Yoichi Kikuchi on Thursday questioned the safety of the design of Taiwan’s Fourth Nuclear Power Plant — the Longmen (龍門) plant in New Taipei City’s (新北市) Gongliao District (貢寮) — saying it was not as safe as Taiwan Power Co (Taipower) claimed.
The Japanese anti-nuclear power activist raised four main questions about the nation’s fourth nuclear power plant.
He said Taipower adopted outdated geological information about the site on which the nuclear power plant is built.
Photo: CNA
The seismic coefficient, an indicator of a structure’s ability to withstand an earthquake is too low, he said.
The design of the power plant’s advanced boiling-water reactor (ABWR) is flawed, Kikuchi added.
He said that the plant’s safety inspection group failed to see the real problems.
Kikuchi arrived in Taipei earlier this week at the invitation of Green Citizen’s Action Alliance, who tried to apply on his behalf for a visit to the plant.
Taipower rejected the application, saying it was inappropriate that foreigners join local residents informing a group of visitors to the plant.
Kikuchi said the recirculating water cooling system was installed outside the reactor.
Because the energy produced by the reactor would cause the temperature in the reactor to rise, the welded part of the guide tubes would gradually crack because of metal fatigue, damage that occurs when a material is subject to repeated pressure.
If an earthquake occured under those circumstances, the consequences would be unimaginable, he said.
Although Taipower has decided to install a recirculating water cooling system inside the reactor instead, he questioned if anyone would risk being exposed to radiation to maintain the system inside the reactor.
The design of the control rods, which are mounted through the holes at the bottom of the reactors, would cause radiation to leak if the reactor melts, he said.
Kikuchi said that many incidents had occurred with the ABWRs that were in operation in Japan, adding that they have yet to resume operations after being suspended.
In response, Taipower, which runs the nation’s three operating nuclear power plants, said that moving the recirculating water cooling system inside the reactor was not something new, adding that similar procedures have already taken place in Europe.
It said the system’s tubes are less likely to break if they are inside the reactors.
It said that there are holes at the bottom of the reactor for control rods, but it had ensured through multiple testing that this part of the reactor is able to endure pressure as any other part in the reactor.
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