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Digital control system installed at China’s Linglong One
Earlier this month, the first digital control system was put in place at Linglong One, a small modular reactor demonstration project being built at the Changjiang nuclear power plant in Hainan Province. This is the world’s first land-based commercial SMR and is controlled by China National Nuclear Power Co. Ltd., a subsidiary of the China National Nuclear Corporation (CNNC).
Roberto Caponetti
Nuclear Technology | Volume 70 | Number 3 | September 1985 | Pages 408-423
Technical Paper | Radioactive Waste Management | doi.org/10.13182/NT85-A15967
Articles are hosted by Taylor and Francis Online.
At Casaccia’s Energy Research Center (CRE) of the Italian Commission for Nuclear and Alternative Energy Sources (ENEA), within the scope of testing activities for penetrating structures (mechanisms) of the Prova Elementi di Combustibile (PEC) reactor plug and of operating procedure acquisition for the PEC itself, a facility for the cleaning of mechanisms after in-sodium testing has been in operation for a number of years. The first phase of a component cleaning program is under way, based on the use of an organic solvent (2-butoxy-ethanol = ethylene glycol monobutyl ether = Butylcellosolve) and atomized water. Characterization activities were carried out in the laboratory on 2-butoxy-ethanol, and the sodium-2-butoxy-ethanol reaction rate was measured at from 35 to 60°C. A cleaning procedure for the prototypes of PEC mechanisms was defined after carrying out in-sodium test cycles. The final procedure used to clean the PEC mechanisms was developed by successive steps, and the entire task was divided as follows: 1. cleaning facility correspondence check 2. effectiveness of alcohol versus aqueous cleaning methods 3. effectiveness of vacuum procedure 4. effectiveness of the procedure for flood and alternate cycles of vacuum and pressurization on the 2-butoxy-ethanol liquid surface. The overall results of the testing have been used as the basis for determining a complete cleaning procedure suitable for all prototypes of the PEC mechanisms. The method selected is based on the utilization of 2-butoxy-ethanol. The nebulized water method is being used at present at Casaccia-CRE for cleaning other components with large values for the ratio of surface area to total sodium quantity. Nevertheless, a study is scheduled of a method using atomized water and carbon dioxide for the test cleaning of the fuel charge machine prototype.