The cables from the United States Embassy in Tokyo were sent in 2006 and 2007, and recount warnings from American diplomats who visited Japanese nuclear plants and observed security drills. The Americans were raising concerns about Japan’s readiness for guerrilla-style attacks by groups like civilian terrorists or North Korean commandos.
In a cable dated Feb. 26, 2007, American officials expressed concern about the absence of armed guards at a nuclear facility in Tokaimura, north of Tokyo, which they described as “a major plutonium storage site.” But the Ministry of Science and Education, which oversees Japan’s nuclear sites, said “there was not a sufficient threat to justify armed police,” the cable said.
The Japanese explained that the site was protected by civilian guards, who cannot be armed under Japanese law, the cable said.
Other cables described the placement of fences, security cameras and motion detectors, and the readiness of Japan’s coast guard to protect nuclear plants near the ocean from seaborne attacks.
In the 2007 cable, the Americans also asked the ministry to conduct background checks of workers with access to sensitive areas of the Tokaimura site, as is standard practice in the United States. Ministry officials replied that while such checks were conducted “unofficially,” constitutional restrictions and privacy concerns prevented the government from making them routine.
While the cables noted that Japan was becoming more aware of threats to its nuclear facilities, they also faulted some countermeasures, particularly antiterrorism training drills, characterized as unrealistic.
A cable dated Jan. 27, 2006, describes an antiterrorism drill at the Mihama nuclear plant in central Japan as “a bit too scripted and perfect.” A cable dated Nov. 2 of the same year faults a drill at the Tokaimura facility at which participants had been given “advance copies of the scenario.”
