4.75. An analysis should be performed to identify the ultimate capability of the containment. The bulk behaviour of the containment structure under static (pressure, temperature and actions of pipes) and dynamic (seismic) loads should be considered, and proper attention should be paid to local effects such as penetrations and structural singularities.

4.76. Failure modes such as liner tearing, penetration failures and tendon failures should be analysed. To the extent possible, a failure should not be catastrophic and should not cause additional damage to systems and components for retaining radioactive material.

4.77. It should be demonstrated in the analysis that the acceptance criteria for structural integrity and leaktightness of the containment are met with an adequate margin so as to avoid ‘cliff edge’ effects[8].