Analysis of Shoal Data on Ground Motion and Containment Safety Program

摘要

Predictions and evaluations of ground motion and con tainment were made for the 12.5 kt Shoal event. A comprehensive ground motion instrumentation program was designed. Peak motions on alluvium were greater than on hardrock by a factor of 2.1 for acceleration, 3.7 for displacement and 3.4 for velocity. The prediction equations for acceleration and displacement were found to represent reasonable upper limits of motion. The objective of the containment evaluation was to assure that appropriate measures had been taken to preclude unacceptable venting of radioactive isotopes to the atmosphere. It was concluded that Shoal would be contained to the same degree as Hardhat and that the stemming plan was adequate. The prediction of containment was substantiated by test results. Limited post-shot exploration allows the following comparisons: cavity radius - 24.7 meters predicted, 25.6 = 0.6 meters observed; chimney height - 110 meters predicted, 108 meters observed; depth of spalling - 122 meters predicted, 120+ meters indicated; radius of spalling -