Removal of the Materials Test Reactor Overhead Working Reservoir.

摘要

Salient features of the removal of an excessed contaminated facility,the Materials Test Reactor (MTR) overhead working reservoir (OWR) from the Test Reactor Area to the Radioactive Waste Management Complex at the Idaho National Engineering Laboratory are described. The 125-ton OWR was an overhead 160,000-gallon-capacity tank approximately 193feet high which supplied cooling water to the MTR. Radiation at ground level beneath the tank was 5mR/hr and approximately 600mR/hr at the exterior surface of the tank. Sources ranging from 3 R/hr to in excess of 500 R/hr exist within the tank. The tank interior is contaminated with uranium,plutonium,and miscellaneous fission products. The OWR was lowered to ground level with the use of explosive cutters. Dismantling,decontamination,and disposal were performed by Aerojet Nuclear Company maintenance forces.