The test series was notable as containing the first time an atomic artillery shell was fired ( shot '' Grable '' ) , the first two shots ( both fizzles ) by University of California Radiation Laboratory — Livermore ( now Lawrence Livermore National Laboratory ) , and for testing out some of the thermonuclear components that would be used for the massive thermonuclear series of Operation Castle . One primary device ( RACER ) was tested in thermonuclear system mockup assemblies of TX-14 , TX-16 , and TX-17 / TX-24 , to examine and evaluate the behaviour of radiation cases and the compression of the secondary geometries by the primary 's x-rays prior to full-scale testing during Castle . Following RACER 's dodgy performance , the COBRA primary was used in the emergency capability ALARM CLOCK , JUGHEAD , RUNT I , RUNT II thermonuclear devices , as well as in the SHRIMP device . RACER IV ( as redesigned and proof-tested in the Simon test ) was employed as primary for the ZOMBIE , RAMROD and MORGENSTERN devices
SHRIMP
Castle Bravo
Operation Upshot–Knothole