The Tokyo Stock Exchange (TSE) said it has raised the daily maximum number of concluded contracts to 8.4 mln from 5 mln previously. The increase is in line with the exchange's broader overhaul of its system, which is designed to be completed by 2008. "We recognize that with this capacity expansion the risk of system breakdown, which would cause a trading suspension, has been lowered significantly," the TSE said in a statement. The TSE previously said that from May 22 it will increase the daily number of orders handled orders to 12 mln from the present 9 mln. That capacity will be further increased to 14 mln orders by December. The TSE's moves followed its decision to cut its afternoon trading session by 30 minutes, starting Jan 19, following worries about the ability of its system to handle the huge volume of orders that followed news of a securities probe into Internet firm Livedoor Co.