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?
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