NHK is reporting that the groundwater bypass system being used by TEPCO isn’t making a significant change in groundwater levels near the reactors.
Monitoring wells showed only about a 10 centimeter drop over the last two months. Regulators asked TEPCO to gather more data.
The current bypass system is quite small, removing only 100 tons of the daily 400 tons of incoming groundwater. This system is also near the reactors being located directly uphill near the buildings.
Our research team and others suggested to IRID that a much larger bypass system would be needed and it should be installed further inland of the plant to encircle the facility. This plan was approved by IRID but never actually implemented by METI or TEPCO.