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On September 28, 2001, Detroit Edison dete … On September 28, 2001, Detroit Edison determined that a non-conservative bias existed in the reactor heat balance methodology for calculating core thermal power. Specifically, the main steam moisture carryover fraction used in the heat balance calculations was found to overestimate the actual moisture content of the steam. Due to this condition, it is possible that Fermi 2 exceeded its licensed power limits on one or more occasions; however, this bias represents an insignificant portion of the total thermal power (less than 0.1 percent) and is also small compared to the overall precision of the core thermal power evaluation. Exceeding the thermal power limit in Fermi 2 License Section 2.C.(1) is a reportable condition under Section 2.F. of the Fermi 2 Operating License.</br></br>Based on the low order of magnitude of the calculation bias and conservatism inherent in the power levels used for safety analyses, this condition did not result in any adverse impact on the health and safety of the public.</br></br>The moisture carryover fraction in the heat balance calculations will be revised to reflect the plant test data. As an interim measure, the maximum reactor power level was administratively reduced by three megawatt thermal.atively reduced by three megawatt thermal. +
On September 28, 2001, Detroit Edison dete … On September 28, 2001, Detroit Edison determined that a non-conservative bias existed in the reactor heat balance methodology for calculating core thermal power. Specifically, the main steam moisture carryover fraction used in the heat balance calculations was found to overestimate the actual moisture content of the steam. Due to this condition, it is possible that Fermi 2 exceeded its licensed power limits on one or more occasions; however, this bias represents an insignificant portion of the total thermal power (less than 0.1 percent) and is also small compared to the overall precision of the core thermal power evaluation. Exceeding the thermal power limit in Fermi 2 License Section 2.C.(1) is a reportable condition under Section 2.F. of the Fermi 2 Operating License.</br></br>Based on the low order of magnitude of the calculation bias and conservatism inherent in the power levels used for safety analyses, this condition did not result in any adverse impact on the health and safety of the public.</br></br>The moisture carryover fraction in the heat balance calculations will be revised to reflect the plant test data. As an interim measure, the maximum reactor power level was administratively reduced by three megawatt thermal.atively reduced by three megawatt thermal. +
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