In present article are considered seismic acceleration data (accelerogramms) recorded at the site of the NPP Kashivazaki-Kariva (Japan) at the earthquake of 16.07.2007 with epicenter in Japan see. As a result of the earthquake some buildings, structures and infrastructure objects of NPP were damaged. As marked in the report of the mission of International Atomic Energy Agency (IAEA), significant part of these damages was caused by big displacements of the soils.

Site of NPP was provided by the net of accelerometers located at different levels and oriented at three cardinal directions. At the time of earthquake the accelerometers were in operating state, and the records of accelerations (accelerogramms) were obtained. In present work evaluation of the velocities of seismic oscillations and evaluation of seismic displacements of soils were fulfilled on the base of analysis of three-component accelerogramm recorded at the free surface of the soil. 

The code of practice in the field of atomic energy establishes the safety targets for NPPs. One of these safety targets regulate the yearly probability of large emergency radioactive release into the air. Accident with reactor pipelines rupture can occur in the case of earthquake. In this case the containment serves as a barrier against radioactive release into the environment. The purpose of this work was to define the strength criteria for containment to ensure the safety targets of yearly probability of large emergency release at seismic and other external events. The results of the work show that in the case of external events the containment strength criteria provide correspondence with safety targets if they are defined with account of yearly probability of the action assumed and with due account of probability of failure (rupture) of reactor pipelines under this action. The strength criteria for containment should be defined with overconsevative reserves, the more is the yearly probability of the action assumed and the more is the probability of reactor pipelines failure under this action. It is shown that at small yearly probability of the action and small probability of the reactor pipelines failure the strength criteria of containment, defined due to the safety target of a yearly probability of large accidental release, became less conservative then civil and erection strength criteria.