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In page Timeline of the Fukushima nuclear accident:

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TEPCO announces that an injection of 6,000 litres (1,600 US gal) of polymer coagulant into the pit mitigated the leaking;[1] however, the IAEA and others credit additional factors.[2] Sodium silicate ("water glass") and additives are injected into the ground in order to stop the leakage of radioactive water.[citation needed] The residual heat carried by the water used for cooling the damaged reactors accelerates the setting of the injected mixture.