Probabilistic Dose Assessment from SB-LOCA Accident in Ujung Lemahabang Using TMI-2 Source Term

Abstract

Probabilistic dose assessment and mapping for nuclear accident condition are performed for Ujung Lemahabang site in Muria Peninsula region in Indonesia. Source term is obtained from Three-Mile Island unit 2 (TMI-2) PWR-type SB-LOCA reactor accident inverse modeling. Effluent consisted of Xe-133, Kr-88, I-131, and Cs-137 released from a 50 m stack. Lagrangian Particle Dispersion Method (LPDM) and 3-dimensional mass-consistent wind field are employed to obtain surface-level time-integrated air concentration and spatial distribution of ground-level total dose in dry condition. Site-specific meteorological data is obtained from hourly records obtained during the Site Feasibility Study period in Ujung Lemahabang. Effluent is released from a height of 50 meters in uniform rate during a 6-hour period and the dose is integrated during this period in a neutrally stable atmospheric condition. Maximum dose noted is below regulatory limit of 1 mSv and radioactive plume is spread mostly to the W-SW inland and to N-NE from the proposed plant to Java Sea. This paper has demonstrated for the first time a probabilistic analysis method for assessing possible spatial dose distribution, a hypothetical release, and a set of meteorological data for Ujung Lemahabang region.

Individual Effective Dose and Nuclear Emergency Planning for Muntok NPP Area using TMI-2 Source Term

“…This method can model spatial variation of wind speed and direction, topography and diffusion coefficient in 3dimensional Cartesian coordinate, the advection-diffusion equation uses empirical dispersion coefficient. The description of the model is given as equation 1 [7].…”

“…The released amount of radioactivity to the atmosphere has been discussed in several papers [3,4,5,6] for isotopes such as I-131, Cs-137, Kr-88 and Xe-133. The source-term strength rate discussed in the papers has been compiled in the previous study [7] and presented in Table 1.…”