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Six workers at Japan's crippled Fukushima nuclear plant were exposed to a leak of highly radioactive water on Wednesday, the latest in a string of mishaps the country's nuclear watchdog has attributed to carelessness, saying they could have been avoided.

Tokyo Electric Power Co, also known as TEPCO, has been battling to contain radioactive water at the plant, which suffered triple meltdowns and hydrogen explosions following a devastating earthquake in March 2011.

In the latest incident, a worker mistakenly detached a pipe connected to a treatment system to remove salt from the hundreds of metric tons of water TEPCO pumps over the melted fuel in wrecked reactors at Fukushima to keep them cool.

"It is serious in that it was another problem caused by carelessness, but I do not believe it is a seriously troubling dosage," Shunichi Tanaka, chairman of Japan's Nuclear Regulation Authority, said on Wednesday.

"But the fact that there has been a string of incidents occurring on a daily basis that could have been avoided - I think that is a large problem."

Tanaka urged TEPCO to improve its handling of contaminated water, but stopped short of saying whether it would face any penalties.

The accidents at the Fukushima Daiichi plant, 220 km north of Tokyo, are adding to a crisis no one seems to know how to contain and stirring doubt over TEPCO's ability to carry out a complex cleanup widely expected to take decades.

Just last week, the regulator ordered TEPCO to bring in additional workers and report within a week on its measures to tackle the hazardous cleanup.

TEPCO said seven tons of water were spilled in Wednesday's incident at the treatment facility but were contained within the site.

Tanaka said the leaked water had already been treated to remove cesium, which emits strong gamma radiation harmful to humans.

On Monday, TEPCO said a plant worker accidentally halted power to pumps used to cool the damaged reactors. A backup system kicked in immediately, but the event was another reminder of the precarious situation at the plant.

Last week, TEPCO said 430 liters of contaminated water had spilled out of a storage tank and probably flowed into the ocean.

In August, a leak of 300 tons of highly radioactive water from a hastily built site tank was given a "Level 3" or "serious incident" rating on the INES scale.

Also in August, TEPCO said two workers were contaminated with radioactive particles, the second such incident in a week involving staff outside the site's main operations center.

TEPCO is trying to restart its only remaining viable plant - Kashiwazaki Kariwa, the world's largest nuclear power station - to cut high fuel costs and restore its finances.

QUESTIONS

1 What is the latest incident at Japan's crippled Fukushima nuclear plant?

2 What was it blamed on?

3 What started the disaster at Tokyo Electric Power Co?

For more audio news, log onto Language Tips at chinadaily.com.cn

ANSWERS

1 Six workers were exposed to a leak of highly radioactive water on Wednesday.

2 Carelessness.

3 A devastating earthquake in March 2011 that led to triple meltdowns and hydrogen explosions at the plant.

（中國日報網英語點津 丹妮 編輯）

About the broadcaster:

Lance Crayon is a videographer and editor with China Daily. Since living in Beijing he has worked for China Radio International (CRI) and Global Times. Before moving to China he worked in the film industry in Los Angeles as a talent agent and producer. He has a B.A. in English from the University of Texas at Arlington.