Japan to probe Tepco radiation cover-up claim

Workers remove components at the Fukushima Daiichi plant (19 July 2012) Nine workers are reported to have put lead shields on their radiation dosimeters to disguise their total exposure

The Japanese government says it will investigate a report that workers at the stricken Fukushima Daiichi nuclear power plant were urged to disguise their exposure to radiation.

Build-Up, a subcontractor for plant operator Tepco, admitted one of its executives told workers to put lead shields on radiation detection devices.

Otherwise, they would have rapidly exceeded the legal limit for exposure.

The Fukishima plant was devastated by the March 2011 earthquake and tsunami.

Cooling systems to reactors were knocked out, leading to meltdowns and the release of radioactivity.

Tens of thousands of residents were evacuated from an exclusion zone around the plant.

Fukushima disaster

  • Reactor cooling systems damaged after 11 March earthquake and tsunami
  • Explosions occurred on 12-15 March at four reactors after gas build-up
  • Tepco engineers injected seawater into reactors for cooling
  • Contaminated waste-water leaked on several occasions
  • Meltdowns later confirmed at three reactors
  • Tepco declared 'cold shutdown' - meaning reactors were stable - in December 2011

Between November and March this year, a group of Build-Up employees were working at Fukushima, trying to restore facilities.

In December, a Build-Up executive told them to cover their dosimeters with lead casings when working in areas with high radiation.

Otherwise, he warned, they would quickly reach the legal limit of 50 millisieverts' exposure in a year, and they would have to stop working.

Build-Up president Takashi Wada told Japanese media nine of the workers complied.

Dosimeters - used to measure cumulative exposure - can be worn as badges or carried as devices about the size of a smartphone.

The workers had a recording of their meeting, the Asahi Shimbun newspaper said.

"Unless we hide it with lead, exposure will max out and we cannot work," the executive was heard saying in the recording, as quoted by the paper.

The executive apparently said he used one of the lead shields himself.

A Tepco spokesman told Reuters on Saturday the company was aware from a separate contractor that Build-Up made the lead shields, but that they were never used at the Fukushima plant.

Earlier this month, a Japanese parliamentary panel concluded the disaster at Fukushima was "profoundly manmade" and its effects could have been "mitigated by a more effective human response".

All of Japan's nuclear plants were shut down in the wake of the disaster but one, in the town of Ohi, has now partially restarted.

More on This Story

More Asia stories



  • Alana Saarinen at pianoMum, Dad and Mum

    The girl with three biological parents

  • Polish and British flags alongside British roadsideWar debt

    Does the UK still feel a sense of obligation towards Poles?

  • Islamic State fighters parade in Raqqa, Syria (30 June 2014)Who backs IS?

    Where Islamic State finds support to become a formidable force

  • Bride and groom-to-be photographed underwaterWetted bliss

    Chinese couples told to smile, but please hold your breath

  • A ship is dismantled for scrap in the port city of Chittagong, BangladeshDangerous work

    Bangladesh's ship breakers face economic challenge

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.