Since 1984, the CDC and the NIH have jointly authored the " Biosafety in Microbiological and Medical Laboratories " ( " BMBL " ) and the separately-published section of the " BMBL ", Appendix A : " Primary Containment for Biohazards : Selection, Installation, and Use of Biosafety Cabinets ".
22.
Over the following three weeks there was evidence of partial nuclear meltdowns in units 1, 2 and 3 : visible explosions, suspected to be caused by hydrogen gas, in units 1 and 3; a suspected explosion in unit 2, that may have damaged the primary containment vessel; and a possible uncovering of the Spent fuel pools in Units 1, 3 and 4.
