PSA Approach To Prevent External Incident On The Safety Of NPP Site

PSA APPROACH TO PREVENT EXTERNAL INCIDENT ON THE SAFETY OF NPP SITE

Basuki Wibowo, Imam Hamzah, Yarianto SBS
Pusat Pengembangan Energi Nuklir, BATAN
Jl. Kuningan Barat, Mampang Prapatan, Jakarta Selatan
ABSTRACT
PSA APPROACH TO PREVENT EXTERNAL INCIDENT ON THE SAFETY OF NPP SITE. PSA Methodology Approach Assessment for NPP Site Safety from External Events Hazards. Assessment for the application of PSA methodology of NPP site safety from external events hazards have done for the purpose of the effectiveness of those methodologies. The way of methodologies are: evaluation from IAEA and US-NRC correlated references. Base on those assessments, the contributions of external events hazards to NPP site safety design base will increase significantly after the IAEA standards criteria full applied for new NPP generation in the future. The IAEA standards criteria documents are: guideline and technical document of NPP site safety evaluation from external events hazards. Safety design base for existing NPP only considered the contribution from internal events hazards. Generally, the criteria applications for NPP external events hazards start from screening stage, where only significant hazards considered for design base. The next stage is taking detailed characterized of those hazards for specific site. After considering external events hazards for NPP safety design base, the probabilistic safety margin increase significantly from 10-4 to 10-8 per year. Uncertainty factor for PSA methodology for NPP site safety from external events hazards can be controlled by synchronizing of internal events and external events hazards.

Key Words: PSA (probabilistic safety assessment), site safety, external and internal hazards, safety design base.
Published : Proceeding "SEMINAR NASIONAL PENGEMBANGAN ENERGI NUKLIR II 2009", Jakarta, 25 Juni 2009.