Category Archives: Design of Reactor Containment Systems for Nuclear Power Plants

Local stresses and fatigue

4.71. Localized stress distributions, including those at welding sites, and their effects on the mechanical performance of structures, including leak rates, should be evaluated. 4.72. For prestressed concrete containments, particular attention should be paid to identifying areas of low prestressing (such as areas surrounding large penetrations and transition zones between cylinder and basemat), so that measures can be taken to […]

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Soft sealing materials

4.206. Soft sealing materials are commonly used in multiple containment applications, such as in the sealing of ventilation valves or the inflatable sealing of air locks. Although these materials contribute to a very high leaktightness of the containment under normal conditions, their behaviour in design basis accidents should be properly demonstrated. Potentially damaging effects for soft sealing materials include embrittlement […]

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BUBBLING CONDENSER CONTAINMENT IN PRESSURIZED WATER REACTORS

I—11. The bubbling condenser containment system (Fig. I-4) in pressurized water reactors uses a concept for the suppression pool in which the high pressure steam-air mixture resulting from the conditions following a LOCA is directed through submerged tubes into pools of water. The steam is condensed in the bubbling condenser pools.

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OBJECTIVE

1.4. Requirements for the design of containment systems are established in Section 6 of Ref. [1]. The objective of this Safety Guide is to make recommen­dations on the implementation and fulfilment of these requirements. It is expected that this publication will be used primarily for land based, stationary nuclear power plants with water cooled reactors designed for electricity generation or […]

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Ice condenser systems

4.107. The ice condenser containment is divided into three main compart­ments: a lower section, an upper section and the ice condenser chambers. After a high energy pipe rupture, a flow path from the lower compartment to the upper compartment through the ice condenser is established. When the high pressure steam-air mixture flows between the columns of borated ice, the steam […]

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Control of leakage from recirculation lines

4.152. Many containment designs include systems to recirculate water from collection points inside the containment envelope, either through heat exchangers or directly, for reinjection into the reactor vessel or into the containment spray system in an accident. Parts of these recirculation systems may be located outside the containment envelope, giving rise to a potential for leakage of radionuclides from pumps, […]

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INSTRUMENTATION FOR MONITORING OF THE CONTAINMENT

A.1. This appendix provides recommendations for the measurement of parameters for the containment systems, to allow diagnosis by the operator of developing deviations from normal operation; in particular, to allow detection of releases of coolant or other radioactive fluids within the containment. The operator can evaluate these parameters and take corrective actions at an early stage to prevent a minor […]

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