The breakdown was not thought to pose any immediate danger, operator Tokyo Electric Power (Tepco) said.
Friday's breakdown at the Fukushima Daiichi nuclear plant lasted around three hours, Tepco said.
It spares neither the government nor Tokyo Electric Power (TEPCO), the operator of the nuclear plant.
It took Tepco three hours to announce that the cooling systems had been shut down.
The councillor shows a Tepco gagging order that one local boss had to sign.
Tepco had been pumping water to raise the level in the No. 2 reactor.
He also said Tepco has "made great progress in terms of disclosure" about their operations.
The footage was shot from a TEPCO helicopter over-flight of the crippled reactor on March 16th.
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The crisis management at TEPCO, the plant's owner, has laid bare an astounding lack of leadership.
Tepco says it will come up with a new plan to stabilise the reactor by Tuesday.
"We are very sorry for our corporate customers, " Toshio Nishizawa, president of Tepco said.
Higher fuel costs are not the only issue facing Tepco, Japan's biggest utility provider.
Judge's first tasks in Japan are helping TEPCO change its safety culture and restore public confidence.
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Tepco has said it aims to start accepting claims in September and making payments in October.
Tepco has been crippled by compensation payments and other costs as a result of the accident.
Three weeks after what happened in Japan, are you convinced that TEPCO has that situation under control?
According to its own admission, between 1986 and 2001, TEPCO committed major safety violations 16 times.
Tepco is planning to send robots to take measurements inside the No 2 reactor later on Monday.
In response to a request for information, Tokyo Electric Power Company (TEPCO), released the raw video below.
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The plant's operator, Tepco, had intended to cool reactor 1 by filling the containment chamber with water.
Tepco said engineers working to reconnect external electrical lines to the station could have power restored on Saturday.
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The north-eastern region of the country is covered by Tepco, Asia's biggest utility firm, and Tohoku Electric Power.
Russia has been sending nuclear specialists to clean up the area near the Fukushima reactors run by TEPCO.
Top government spokesman Yukio Edano acknowledged that Tepco's plans were feasible, but warned there could be unforeseen setbacks.
Tepco's other plants also exposed their workers to higher doses of radiation than most other big Japanese operators.
Tepco has also invested in Automated Power Exchange, an American start-up that runs Internet-based exchanges for trading electricity.
Tepco, Japan's biggest power company, for instance, is keen to learn about the opportunities and pitfalls of deregulation.
Two TEPCO workers were rushed to the hospital yesterday after radioactive water penetrated their radiation suits, burning their skin.
According to Tokyo Electric Power Company (TEPCO), workers at the Fukushima Daiichi (FDI) nuclear power plant have been evacuated.
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In any case, the TEPCO disaster shows that risk management matters, and highlights why good corporate governance is important.
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