Plant Operating Events
As the plant was only in operation for three years, a summary of key operating events is included
| Date | Action |
|---|---|
| June 1963 | Initially criticality achieved. |
| July 1963 | Fuel loading completed. |
| January 27, 1964 | Full power achieved; reactor operated steadily but with one scram. |
| May 21, 1964 | First scheduled shutdown for routine maintenance and inspection
During this period of operation, POMR contributed ~ 40% of the energy generated by the City of Piqua. |
| December 7, 1964 | Reactor was shut down to renew fifteen in-vessel filters and remove the fuel element in Core position F-13 for examination. |
| January 28, 1965 | Reactor was shut down for complete replacement of in-vessel filters, maintenance, and for
relocation of the instrumented fuel element from position E-12 to position D-5. |
| April 2, 1965 | Several malfunctioning control rod drive units repaired. Concern over possible
plugged condition of the inner process tube of the control rod-bearing elements led to the movement of the six inner ring control rod elements to peripheral positions. The core size was increased from 61- 67 fuel elements. |
| May 6 – 12, 1965 | Scram occurred on May 6, 1965. During this time, the reactor coolant level
had been lowered by operational error, which resulted in a temporary loss of circulation through three elements. Shutdown was extended until May 12 so the three fuel elements could be removed to spent-fuel storage. |
| May 13, 1965 (est) | Immediately upon restart, excessive surface temperatures were noted, necessitating
additional fuel element removal. Because of the fuel element removal, the system operated with only one coolant pump during the latter half of June and into July. |
| July 18, 1965 | Reactor shut down for modifications, maintenance, and in-vessel filter replacement;
performed extensive modifications of the in-core control rod circuitry. |
| September 6, 1965 | Reactor operation resumed. |
| October 12, 1965 | Reactor shut down, fuel rearrangements were made, increasing the core loading to 70 fuel elements. |
| October 23, 1965 | Reactor restarted. Operation of the reactor continued at an average power level of about 24 MWt. |
| January 13, 1966 | Reactor scrammed because of a spurious signal. At this time, there was no
indication of any unusual condition in the reactor core. Prior to restarting the reactor, an abnormal in-core condition was identified during the performance of a rod-drop test. |
Read more about this topic: Piqua Nuclear Generating Station
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