HTGR accident initiation and progression analysis status report. Volume III. Preliminary results (including design options)
The results of a preliminary risk analysis, which was completed in February 1975, and represents the scoping phase of the AIPA program of the systematic probabilistic study of HTGR safety are presented. The preliminary phase was expected to provide several benefits: (1) establish a framework for the ranking of HTGR abnormal event sequences with respect to safety as an aid in the selection of future efforts, (2) provide quantitative data for the identification of R and D tasks, (3) provide bases for the selection of systems suitable for the studies of economic aspects of alternative design options for the safety-related systems, and (4) provide insights as to which aspects of the risk analysis need to be emphasized in the future to achieve necessary maturing of the probabilistic methodology. Seventeen initiating events were chosen and evaluated, these being representative of the complete spectrum of classes of potential radioactive sources in the plant and having potentially the highest probabilities of release within each class. While this ensured a considerable degree of completeness, it also resulted in evaluations of many events with insignificant risk, which are found in the text (e.g., an improbable event of release from a crushed small neutron source capsule). The most immediate application of preliminary analysis results was to determine which initiating events deserved a more detailed examination. (auth)
- Research Organization:
- General Atomic Co., San Diego, Calif. (USA)
- DOE Contract Number:
- E(04-3)-167
- NSA Number:
- NSA-33-022320
- OSTI ID:
- 4069791
- Report Number(s):
- GA-A-13617(Vol.3)
- Resource Relation:
- Other Information: Orig. Receipt Date: 30-JUN-76
- Country of Publication:
- United States
- Language:
- English
Similar Records
Primary coolant system response to an HTGR core heatup
Update of HTGR risk assessment study