Contaminant Dispersion Analysis in Interim Storage for Spent Nuclear Fuel Building

The release of radioactive contaminants in nuclear facility within and around facility
building could be caused by accident, faulty equipment, HEPA filter replacement or other causes.
This can be harmful to the humans. This paper introduces potential contaminant dispersion analysis
inside interim storage building for spent nuclear fuel in Serpong Indonesia. The simulation results
show that the generation of radioactive contaminant in ISSF can be safely reduce by VAC system.
The negative pressure design in ISSF can and avoid the spreading of contaminants into other rooms.
However in VAC off condition, the contaminant concentration could exceed the maximum allowed
limit. In the the existing building condition without VAC, there are relatively very small internal
overpressure that can lead air and also harmful radioactive contaminant to flow out into ambient.
However, if there are several leakages in building wall with different elevation, the risky
overpressure phenomenon may be possible.