Routine reactor operation with four end-of-cycle shutdowns and one scheduled midcycle shutdown resulted in an on-stream time of 93.6% for the quarter. This gave the HFIR an on-stream time for the year of 91.3%. The outer control plates were replaced, and the annual core components inspection was made.

Routine operation of the reactor was resumed with an onstream time of 93.7 percent. An in-reactor test of four journal-type bearings on one control plate was started. These bearings will be operated for four fuel cycles, if no problems develop. The use of chromate salts for corrosion protection in the secondary coolant system was discontinued. Basic operating data are presented.

Routine reactor operation with four end-of-cycle shutdowns, one scheduled shutdown for analysis of servo problems, and one unscheduled shutdown resulted in an on-stream time of 87.4%. Scheduled reactor component replacement and the semiannual reactor component inspection were completed.