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The following information is a summary pro … The following information is a summary provided by the licensee via phone and email:</br>On September 7, 2023, a Senior Reactor Operator (SRO) noted that power indication channel 1 and channel 2 initially responded abnormally during preoperational checks. It was determined that the data acquisition system (DAS) system had been de-energized possibly by a power outage the night before. The DAS was re-energized and channel 1 and channel 2 both returned to normal. Preoperational checks were able to be completed but the reactor start up was not completed due to time.</br>On September 14, 2023, the licensee was concerned regarding the initial abnormal response of the power indications when the DAS was de-energized, and it was determined that further investigation was needed to fully understand the potential effects on the reactor power channel indications. A plan was developed and approved by the Reactor Administrator to perform applicable steps of OP-1 to perform pre-operational and rod-drop tests with DAS energized and with DAS de-energized. All indications and pre-operational checks were normal with DAS energized.</br>A rod drop test was performed while de-energizing DAS to determine the effect if any on reactor power and scram functionality. Safety rod 1 and 2 were raised (reactor not critical), data recorded, then the power to DAS was removed. The power readings after DAS was de-energized were as follows: channel 1 - 150 cps (counts per second), channel 2 - off scale high on meter and chart recorder, channel 3 - 33 percent of 10 mW. The SRO noted that reactor did not scram when channel 2 indicated off scale high. The SRO manually scram the reactor, power to DAS was restored, and all indications returned to normal. An attempt to perform the pre-operational checks with DAS de-energized was aborted due to channel 1 and 2 indicating abnormally.</br>The licensee contacted the NRC Project Manager.icensee contacted the NRC Project Manager. +
22:00:00, 14 September 2023 +
56,740 +
13:34:00, 15 September 2023 +
22:00:00, 14 September 2023 +
The following information is a summary pro … The following information is a summary provided by the licensee via phone and email:</br>On September 7, 2023, a Senior Reactor Operator (SRO) noted that power indication channel 1 and channel 2 initially responded abnormally during preoperational checks. It was determined that the data acquisition system (DAS) system had been de-energized possibly by a power outage the night before. The DAS was re-energized and channel 1 and channel 2 both returned to normal. Preoperational checks were able to be completed but the reactor start up was not completed due to time.</br>On September 14, 2023, the licensee was concerned regarding the initial abnormal response of the power indications when the DAS was de-energized, and it was determined that further investigation was needed to fully understand the potential effects on the reactor power channel indications. A plan was developed and approved by the Reactor Administrator to perform applicable steps of OP-1 to perform pre-operational and rod-drop tests with DAS energized and with DAS de-energized. All indications and pre-operational checks were normal with DAS energized.</br>A rod drop test was performed while de-energizing DAS to determine the effect if any on reactor power and scram functionality. Safety rod 1 and 2 were raised (reactor not critical), data recorded, then the power to DAS was removed. The power readings after DAS was de-energized were as follows: channel 1 - 150 cps (counts per second), channel 2 - off scale high on meter and chart recorder, channel 3 - 33 percent of 10 mW. The SRO noted that reactor did not scram when channel 2 indicated off scale high. The SRO manually scram the reactor, power to DAS was restored, and all indications returned to normal. An attempt to perform the pre-operational checks with DAS de-energized was aborted due to channel 1 and 2 indicating abnormally.</br>The licensee contacted the NRC Project Manager.icensee contacted the NRC Project Manager. +
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00:00:00, 15 September 2023 +
R-110 +
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13:34:00, 15 September 2023 +
0.649 d (15.57 hours, 0.0927 weeks, 0.0213 months) +
22:00:00, 14 September 2023 +
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