DS507 - Seismic Hazards in Site Evaluation for Nuclear Installations
Status: STEP 12
Beteiligte IAEO-Komitees: NUSSC, WASSC
Specific Safety Guide
The document (SSG-9) was first published in 2010.
The current revision (DS507) was initiated to
- Ensure consistency with applicable requirements for site evaluation (SSR-1, revision of NS-R-3 Rev.1, Ex. DS484)
- Ensure coherency and consistency with the other relevant IAEA Safety Standards (e.g. SF-1, SSR-2/1, GSR Part 2 and 4),
- Incorporate the lessons learned and address challenges highlighted IAEA Report on Fukushima-Daiichi NPP Accident.
New information in DS507 includes
- Newly developed methods of data collection
- Addressing issues related to multi-unit sites (consistent with SSR-1)
- guidance on hazard/design interface with site response.
- More detail of capable faults and fault displacement hazard analysis for new and existing nuclear installations
- Combination of seismic hazards (surface faulting and ground motion) and relevant geological, hydrological and geotechnical hazards.
Implications arising from the Fukushima Daiichi NPP Accident
- highlighted issues of uncertainties in the assessment of seismic hazards
- natural hazard assessment has to be sufficiently conservative
- historical data in the establishment of the design basis of nuclear power plants is not sufficient to characterize the risks of extreme natural hazards
- re-evaluated on a periodic basis to consider advances in knowledge, and necessary corrective actions or compensatory measures