Buoyancy, Transport, and Head Loss of Fibrous Reactor Insulation.

摘要

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. This insulation debris could affect the recirculation of water from the sump of the emergency core cooling system (ECCS) by collecting on the screen surrounding this sump. 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 were tested in undamaged, opened, broken up in pieces and shredded conditions. Small samples of reflective metallic and closed cell insulations were also tested for transport and buoyancy. This report contains experimental data which can be used to assess insulation debris transport and screen blockage effects. Revision 1 contains additional data and uncertainty analyses, for head loss characteristics of accumulated insulation fragments. Filomat fiberglass and mineral wool fibrous insulations were tested.