IDAHO NATIONAL LABORATORY
New Waste Calcining Facility (NWCF)
The first Waste Calcining Facility (WCF) operated from 1963 to 1981, when it was replaced by the New Waste Calcining Facility (NWCF), which opened in 1982. Though the original calciner was shutdown, the evaporator system continued to operate from 1983 to 1987. The following year, DOE-ID assigned it interim status. During the 1980s, many major facilities were replaced with modernized structures designed to be safer, cleaner, and more efficient. The construction of the NWCF with a replacement system resulted in the closure of the original evaporator system along with the WCF.
Calcining, which was developed at INTEC, is a process of converting liquid waste into a dry, granular solid material called calcine, which reduces the volume of the waste by a ratio of eight-to-one and makes it easier to store. Prior to calcining, the high-level liquid waste (HLW) was stored at the Tank Farm, which was composed of 11 stainless steel underground storage tanks in reinforced concrete vaults. Calcination of HLW continued until February 1998. In all its years of operation, INTEC converted over eight million gallons of liquid waste.
The NWCF was in maintenance shutdown for installation of an HLW evaporator before resuming operation from June 17, 1997 until mid April 1998. Following a planned outage for maintenance and repairs INTEC resumed operation on January 23, 1999. It operated until April 30 of the same year when, in accordance with a DOE order, it suspended operations.
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