The ORR operated at an average power level of 29.9 Mw for 82.8 percent of the time during January, February, and March of 1976. Two fuel elements were declared spent (58.8 percent average burnup) during the quarter, while twenty-eight new elements were placed in service. Four shim-rod elements were retired from service at an average burnup of 64.4 percent. The reactor was shutdown on nine occasions, one of which was unscheduled. Two end-of-cycle shutdowns accounted for 92.1 percent of the total downtime. The remaining downtime was used principally for refueling and experiment work. Maintenance activities, both mechanical and instrument, were essentially routine in nature. Special tests or measurements completed during the quarter were three calorimeter gamma heating runs made in CP-E5 during the end of Cycle 129 shutdown.

The ORR operated at an average power level of 29.8 Mw for 50.9 percent of the time during July, August, and September of 1976. One fuel element was declared spent (62.4 percent burnup) during the quarter, while five new elements were placed in service. Two shim-rod elements were retired from service at an average burnup of 69.0 percent. The reactor was shut down on twelve occasions, all of which were scheduled. Reactor downtime needed for refueling, maintenance and checks was quite low, with the reactor remaining available for operation 95.5 percent of the time. Maintenance activities, both mechanical and instrument were essentially routine in nature. In-service inspections completed during the quarter included: (1) inspection of the decay tank strainer on 9-21-76, and (2) inspection of the reactor primary heat exchanger No. 3, secondary side, on 9-24-76.

The ORR operated at an average power level of 28.7 MW for 73.4 percent of the time during January, February, and March of 1978. Eight new fuel elements were placed in service. The reactor was shut down on sixteen occasions, one of which was unscheduled. Reactor downtime needed for refueling, maintenance and checks was quite low, with the reactor remaining available for operation 88.9 percent of the time. Maintenance activities, both mechanical and instrument were essentially routine in nature. Special tests or measurements completed during the quarter included: (1) reactivity measurement of the Metals and Ceramics Division's (ORR-MFE-1) experiment in CP-C7; (2) flux mapping for core No. 143-B; and (3) calibration of all six shim rods on February 12, 1978 (Appendix A), and calibration of shim rods Nos. 2 through 6 on February 16, 1978.

The ORR operated at an average power level of 29.9 MW for 91.3% of the time during January, February, and March of 1980. The reactor was shut down on twelve occasions, six of which were unscheduled. Reactor downtime needed for refueling, maintenance and checks was normal, with the reactor remaining available for use 93.7% of the time. Maintenance activities, both mechanical and instrument, were essentially routine in nature with the exception of one Reactor Instrument and Controls Design Change Memo.