Wyniki wyszukiwania - BazTech

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Development of a Library Based Tool for Screening External Hazards and Hazard Combinations

Röwekamp M., Sperbeck S., Türschmann M.

Journal of Polish Safety and Reliability Association

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2017

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Vol. 8, No. 1

105--110

EN

For a meaningful and efficient probabilistic risk analysis of external hazards and event combinations involving such hazards those hazards with significant risk potential need to be identified and considered for detailed anal-yses. Such a site and plant specific screening approach for external and internal hazards based on a hazards library covering all types of hazards is under development at GRS. The paper provides insights on the approach and first examples of application.

2

Hazard assessment in case of external flooding

Iancu A., Berg H. P., Krauß M.

Journal of Polish Safety and Reliability Association

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2016

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Vol. 7, No. 1

87--98

EN

Risks relating to external hazards, either natural or man-made, have to be taken into consideration in the design of nuclear and other industrial facilities. These risks have to be studied to guarantee the availability and efficiency of safety functions which, e.g. in the case of power reactors, enable a safe shutdown, maintain the reactor in a safe shutdown state, ensure the residual heat removal and the containment of radioactive products. With a view to design protection against risks related to external hazards, these hazards have to be assessed in an appropriate manner. The methods used can be either deterministic or probabilistic. In both cases, the method strongly relies on observations (e.g. flood records) that are processed to define a maximum event for the respective facility design. Moreover, the validity of these records over a certain time frame like 100 years has to be checked. Coping with external hazards such as flooding in the future requires an in-depth assessment taking into account new data, further developed methodologies and criteria. Some of these ideas, developments and applications are provided.

3

Resilience of nuclear plants in case of hazards

Berg H. P., Krauß M.

Journal of Polish Safety and Reliability Association

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2015

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Vol. 6, No. 1

7--14

EN

Internal and external hazards analysis methods have been used recently to evaluate operating nuclear power plants (NPP) and to identify the resilience of NPP in case of hazards and potential needs for modification of plant systems and procedures as well as to support design of new plants The external hazards risk contribution has been modeled in many NPP PSA (at least for some external hazards) over the last decade, including events occurring during shutdown and low power operations. Recently, a revision of the German nuclear safety regulations has been successfully completed and these regulations entitled “Safety Requirements for Nuclear Power Plants”, also requiring a detailed investigation of internal and external hazards and combinations of different hazards applying deterministic and probabilistic safety assessment methods.

4

External hazards – screening procedures and probabilistic assessment

Berg H. P., Görtz R., Schimetschka E.

Journal of KONBiN

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2006

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No. 1

245--253

EN

In particular in case of probabilistic analyses of external hazards, the assessment can be very detailed and time consuming. Therefore, it is necessary to have procedures to screen out, e.g., rooms or buildings of a complex plant where no further detailed analysis is required or to have a graded procedure for the respective hazard taking into account plant- and site-specific conditions. Examples for such screening procedures are provided for rooms and buildings of a nuclear power plant for the external hazards aircraft crash, external flooding, explosion pressure waves and seismic hazards.