Spent Fuel Pool Island (SFPI) is a spent nuclear fuel storage pool that operates independently of existing nuclear facilities to safely manage SNF and minimize maintenance costs during the nuclear decommissioning process. Since the radiation controlled area can be dismantled before transporting SNF to a dry storage facility, the overall decommissioning period can be shortened, and the risk of occupational exposure during dismantling is reduced. In the US, various nuclear power plants have introduced SFPI for this reason. In this paper, to analyze the economic feasibility of application of SFPI to nuclear power plants to be decommissioned, several scenarios are established in consideration of the decommissioning plan and schedule, SFPI and dry storage facility application schedule. Cost and benefit list (SFPI application cost, SNF management cost, SNF dry storage cask cost, etc.) for each alternative were derived, and economic analysis was conducted by applying the Net Present Value (NPV). As a result of the analysis, it is found that the application of SFPI during decommissioning is economically effective as the NPV showed a positive number even when uncertainty was taken into account.

The characteristics of adsorption and desorption of benzene and toluene were investigated at a fixed bed packed with the activated carbon and activated carbon fiber. Through breakthrough experiments under various feed concentration conditions, it was found that the slope of mass transfer zone and the tailing in the breakthrough curves were different from the feed conditions due to different heats of adsorption. In hot nitrogen desorption, the regeneration time and mass transfer zone of the toluene desorption curve were longer than those of the benzene desorption curve because of the difference in adsorption affinity. With an increase in the regeneration temperature, the height of roll-up and the sharpness of desorption curves increased but the regeneration times decreased. The adsorption capacities of the activated carbon and activated carbon fiber after three-time thermal regenerations decreased about 25% and 37% for benzene and 18% and 25% for toluene, respectively. To investigate the effect of the regeneration temperature on the energetic efficiency, the characteristic desorption temperatures of toluene and benzene were investigated by calculating purge gas consumption and temperature.

A series of observations was conducted in order to study the accuracy of the Jlosition by automatic Loran-C navigation system with two Loran-C chains, namely 5970 and 9970 Chain, in the EJst Sea and Southern Sea of the Korean Peninsular from July to September 1986. Diurnal variation of positional error measured by 5970 Chain was almost stable throughout a whole day, and it was fairly stabl2 in the daytime but fluctuated more or less by night at each station by 9970 Chain. Daily mean values of positional error by 5970 Chain were 6'.44 SWat U1reungdo, 0'.22 SE at Jugbyeon, 0'.91 NE at Guryongpo, 0'.37 SE at Pusan, 0'.30 SE at Yokchi, 0'.37 NW at Cheju and 12'.51 SE at Taeheuksan. By 9970 Chain, they Wer2 0'.27 SWat Ulreungdo, 0'.27 SE at Jugbyeon, 0'.09 SWat Guryongpo, 0'.19 SE at Pusan, 0'. IG SE at Yokchi, 0'.17 Sr:: at Cheju and 0'.52 SE at Taeheuksan.