The NRC staff is in the process of reappraising its regulatory position relative to the decommissioning of nuclear facilities.^ ' As a part of this activity NRC has initiated two series of studies through technical assistance contracts. These contracts are being undertaken to develop information to support the preparation of new standards covering decommissioning. The basic series of studies will cover the technology, safety and costs of decommissioning reference nuclear facilities. Light water reactors, fuel cycle facilities and byproduct utilization facilities are included. Facilities of current design on typical sites are selected for the studies. Separate reports will be prepared as the studies of the various facilities are completed. The first report in this series was published in FY 1977 and covered a fuel reprocessing plant;^ ' the second was published in FY 1978 and covered a pressurized water reactor, ' the third and fourth of the series were (4) published in FY 1979 and deal with a small mixed oxide fuel fabrication plant^ ' (5) and a low-level waste burial ground.^ ' This report is an Addendum to the report on the pressurized water reactor. It supplements that report by providing information on the technology, safety and costs of the entombment mode (l)Plan for Reevaluation of NRC Policy on Decommissioning of Nuclear Facilities. NUREG-0436, Office of Standards Development, U.S. Nuclear Regulatory Commission, March 1978.

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