Here's the IAEA report: https://www.iaea.org/sites/default/files/iaea_comprehensive_alps_report.pdf

The discharge limit for tritium is pre-defined in the Government Policy for discharges of ALPS treated water as 22 TBq per year, which is equivalent to the pre-accident discharge limits at FDNPS.

I'm also curious about how much discharge nuclear generators normally produce. If they discharge a certain amount as part of normal operation then it seems to me to also become a function of how many nuclear generators are being operated globally.