1.9E+9Bq of beta nuclide leaked

Contaminated water leaked at reverse osmosis membrane of desalination unit. (After collecting gamma nuclides)

• 4/27/2012  9:17 Sob-contract company worker found water leakage.
• 9:30  Tepco employee stopped the desalination unit.
• 9:35  Water leaking alarming system finally started working in water purification control room.
• 10:19  Caught the leaking water by a plastic bag and stopped leakage by Valve isolation operations.
• 10:20 ~ 11:10  Collected leaked water.
• Leakage amount was 36L.
• Radiation level of the surface, Gamma : 1mSv/h    Beta : 7mSv/h    Alpha : Unknown
• Reason : Unknown.
• Leakage amount of radionuclide : Cesium 134  5.4E+4   Cesium 137  7.5E+4    Total beta 1.9E+9

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