A previous analysis of the radiological impact of removing and replacing corroded steam generators has been updated based on experience gained during steam generator repairs at Surry Unit 2. Some estimates of occupational doses involved in the operation have been revised but are not significantly different from the earlier estimates. Estimates of occupational doses and radiOactive effluents for new tasks have been added. Health physics concerns that arose at Surry included the number of persons involved in the operation, tne training of workers, the handling of quantitites.of low-level waste, and the application of the ALARA principle. A review of these problem areas may help in the planning of other similar operations. A variety of processes could be used to decontaminate steam generators. Research is needed to assess these techniques and their associated occupational doses and waste volumes. Contaminated steam generators can be stored or disposed of after removal without significant radiological problems. Onsite storage and intact shipment have the least impact. In-placing retubing, an alternative to steam generator removal, results in occupational doses and effluents similar to those from removal, but prior decontamination of the channel head is needed. The retubing option should be assessed further.

The Teplator is a nuclear heat-only reactor under development in the Czech Republic, which uses already irradiated spent nuclear fuel (SNF). This study aims to assess the feasibility of integrating this technology with district heating systems (DHSs) compared with other heating technologies. Therefore, the heating sector in the Czech Republic is evaluated, the need for alternative clean energy sources is explained, and some potential candidate locations for implementing the proposed technology are determined. The availability of the required SNF is investigated. An economic model based on cash flows is developed for evaluating different heat sources. The method includes the essential costs: investment, fuel, operation, maintenance, carbon emission, and additional expenses. The economics of the Teplator is calculated compared with gas, biomass, heat pump, and electric-based district heating show that Teplator has less expenditure of 55% and 42% than gas boilers and heat pumps. Moreover, 217 kg of CO 2 emissions is saved per MWh compared with gas-based heating. Sensitivity analyses of interest rate, fuel price, construction cost, etc., representing variant scenarios are performed. Although in some cases, for example, when the interest rate is >10%, or 0% salvage value is assumed for Teplator, heat pumps are competitive, Teplator is feasible in many probable scenarios.