– Water with 1 sievert per hour dose rate was leaking directly into ocean after 3/11 -Japan Gov’t (ENENews, Aug 4, 2012):
Title: April 4th, 2011 – Water with dose rate of more than 1000 mSv/hr confirmed leaking directly into the sea
Date: July 31, 2012
NISA press release from April 2, mentioned that water with dose rate of more than 1000 mSv/hr (100 rem/hr) was confirmed by TEPCO at around 3:20 UTC on April 2 inside the cable storage pit located next to Unit 2 discharge point. There exists a crack of approximately 20 cm on the sidewall of the pit closest to the sea and water inside the pit is confirmed and shown to be leaking directly to the sea. News reports indicate the flow of this water is approximately 2 L/sec.
h/t Chris Harris