MWTF, material selection for insulating/supporting pad letter report. Revision 1
The Multi-Function Waste Tank Facility (MWTF) consists of six 1.1 6 million on underground double-shell waste storage tanks and associated systems. Four of the tanks will be located approximately 2,000 feet west of the western boundary of the 200-East Area of the Hanford Site; two tanks will be located in the southeast corner of the 200-West Area. These tanks will provide storage of mixed hazardous waste. Revision 0 of this report was completed in July of 1993. Since that time, the design of the tanks has changed to using carbon steel for the primary tank and secondary liner in lieu of stainless steel. This means that the primary tank will require postweld heat treatment (PWHT) at a temperature of 1100{degree}F. In addition, scoping calculations of the temperature distributions in the supporting pad indicate that pad insulating properties have a significant effect on the temperatures experienced by the piping embedded in the pad and the concrete foundation slab during PWHT. Each double-shell tank will be comprised of two main structures: an outer structure made of reinforced concrete and lined with a carbon steel secondary liner, and an inner primary storage tank that is a completely enclosed carbon steel ASME Section III vessel. An annular space will separate the carbon steel secondary liner from the primary storage tank. An insulating/supporting pad will be placed between the bottom of the secondary liner and the bottom of the primary storage tank. The existing double-shell tanks at the Hanford Site were constructed with an insulating castable refractory material at this location. This refractory material was used to protect the tank foundation from the high temperatures produced during the PWHT operation for the carbon steel primary storage tanks. This letter report provides the basis for material selection for the insulating/supporting pad to be used on this project.
- Research Organization:
- Westinghouse Hanford Co., Richland, WA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-87RL10930
- OSTI ID:
- 71581
- Report Number(s):
- WHC-SD-W236A-ER-018-Rev.1; ON: DE95010939; TRN: 95:015232
- Resource Relation:
- Other Information: PBD: 25 Apr 1995
- Country of Publication:
- United States
- Language:
- English
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