defective seals in some electrical junction panels. A pipeline was run from the pits south into an uninhabited valley. Portable compressors and a jet were used to bring the pits to sub-atmospheric pressure for the rest of the experiment. The safety radiation detectors shut down the reactor a few times during restart and were withdrawn to be further away from the reactor. Eventually, the reactor started back up and reached high power. On November 12, operation of the reactor was demonstrated to Air Force and ANP personnel who had gathered at ORNL for a quarterly information meeting. Load following was demonstrated by turning the blowers on and off. With all operational objectives attained, the decision to cease operation was made. Colonel Clyde D. Gasser was visiting the lab at this time and was invited to officiate the termination of the experiment. At 8:04 P.M., he scrammed the reactor for the last time. Much information was published about the operation of the reactor, including detailed experimental logs, power traces, and a total of 33 lessons learned. Decommissioning Between shutdown and fuel dumping, the operating personnel were required to wear gas masks due to the high level of airborne radioactivity, which was due to a offgas leak, which was never exactly located. On November 13th, the fuel was transferred to the fuel dump tank. Pressurized carrier salt flushed the pipes and diluted the dump tank. Flush salt was heated to above the system temperature and pumped through the fuel channels. Operators observed the thermocouples to ensure flush salt flowed in all channels. Two flat by lead shields with thickness were suspended in the heat exchanger cell to protect decommissioning personnel from radiation from the fuel systems. Water lines were cut first. Then, sodium lines were cut with hack saws and immediately sealed with several layers of masking tape. The sodium pump was cleaned and the impeller was removed for examination. When the sodium pump and heat exchanger were removed, the radiation field in the room increased to 600 mrem/hr. The equipment had been shielding the area from the fuel system radiation. The fuel system was carefully dismantled starting in February, 1955. The main fuel pump bowl surveyed at 900 mrem/hr at . A portable grinder that could be operated from within a lead box was built to cut the fuel lines near the reactor can. Once it was free, the reactor was