STANDARD MHTGR LICENSING BASES

In developing the remaining elements of the Standard MHTGR licensing bases -the Principal Design Criteria and the classification of equipment - attention... 

For the purposes of defining the Standard MHTGR licensing bases, the lOCFRlOO Design Criteria are qualitative statements, specific to the Standard MHTGR,... 

The final element of the Standard MHTGR licensing bases is the classification of plant equipment. In concert with development of the lOCFRlOO Design Criteria, this classification of equipment is done to focus attention on the minimum set of structures, systems, and components (SSCs) capable of performing all of the radionuclide control functions required to limit releases from DBFs to those allowed by lOCFRlOO, and, therefore, capable of fulfilling the design commitments made in the criteria. To draw this focus, these SSCs are designated as "safety-related."... 

Specific application of this methodology to the Standard MHTGR is described in detail in the Application of Bridging Methods for Standard HTGR Licensing Bases ("Application of Bridging Methods") and summarized here. (Ref. 2)... 

This PSID documents the licensing criteria and bases which have been established for the Standard MHTGR, the conceptual design that has been developed, and the analytical results which indicate that the criteria can be met. 

Selection of licensing basis events (LBEs) is based on the probabilistic risk assessment (PRA) performed as part of the Integrated Approach and constitutes the process which establishes the bridge between the engineering approach and the licensing basis for the Standard MHTGR. The use of the PRA for LBE selection provides a basis for judging, in a quantitative manner, the frequency of the entire event sequence and, therefore, the appropriate dose or risk criteria to be applied. 

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