Two new inspections into kraft pulp and paper mills in Washington have been opened, following ongoing investigations at the Nippon Dynawave mill where a tank failure killed 11 workers. The Washington State Department of Labor & Industries said investigations are going on at two other active paper mills in the state that use the same process, where caustic chemical compounds are used to help break down wood into pulp for paper product manufacturing. In the weeks following the implosion of a massive tank at the paper mill that spilled hundreds of thousands of gallons of chemicals – believed to be the deadliest industrial accident in state history – managers of similar operations have been dialing up their insurance brokers to find out how well they’re protected. One investigation is occurring at a mill run by Smurfit Westrock, also in Longview. The other, run by Port Townsend Paper Company, is in Port Townsend.