Steam Generator (SG) is one of the most important components of the reactor system. It is important as the core itself, because reliability with a minimum amount of maintenances is mandatory for a long time period of time. Indeed, the availability of the plant will be determined by the SG reliability. Specifically, in integral type reactor, enhancement of the thermal effectiveness and resistance against corrosion is of utmost concern to increase the plant performance.

Seismic Design Criteria

The internal reactor pressure vessel structure of integral type is completely different from the existing design, i. e. by introduction of SGs in RPV just above the core. Such configuration requires certainly higher requirements to seismic design.

Needs in the Future

In order to support the development of integral concept extensive experimental program have been undertaken. However, the following research and development (R&D) are considered necessary to develop the reactor more efficient:

• An efficient and reliable SG including the material development related to corrosion protection.

• Reactor dynamics including the accidental conditions using large scale thermal-hydraulic test facility.

• A demonstration/experimental plant might be necessary to be constructed to demonstrate the operability and maintainability.

Beside this, to reach proveness of integral design technology the international promotion must be supported by creation of industrial consortium. The work must be developed together between designer, vendor, utility and the government.