The information presented in the paper is based on the testing documented in items: (a) and (b) below. Tests were performed on concrete end anchorage regions for prestressing tendons with ultimate strengths of approximately 8900 kN. One test structure simulated a full scale concrete containment buttress and the other two test specimens were concrete blocks. The behavior of the test structure and specimens, when subjected to loading, was monitored by strain gages and dial gages. The testing illustrated that all of the amounts of reinforcing tested should be acceptable for the end anchor zones of large tendons presently used in...