[en] In the event of a Loss of Coolant Accident (LOCA) in a nuclear power plant, it is possible that insulation for pipes or other items inside the containment building could be dislodged by the high energy break jet. To help in assessing the possible effect of detached insulation on the ECCS, buoyancy, transport, and head loss characteristics of the insulation were studied experimentally. Three types of insulation pillows with mineral wood and fiberglass cores were tested in undamaged state, with their covers opened and with the insulation core in broken-up and shredded conditions. Small samples of reflective metallic and closed cell insulations were also tested for transport and buoyancy. This revision 1 of NUREG/CR-2982 is an expanded version of the original document, increasing the range of measured head losses through beds of accumulated fragments to a thickness of 10 inches. New fitting formulae were also developed to cover the expanded data range, replacing the formulae set forth originally which, when extrapolated over the new data range, sometimes gave head losses lower than measured. Uncertainty bands were also developed for the new fitting formulae