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On October 1, 2001, it was determined that … On October 1, 2001, it was determined that a non-conservative assumption for the steam carryover fraction of main steam has been applied in the General Electric methodology for calculating reactor core thermal power at the Perry Nuclear Power Plant (PNPP). This was documented in a General Electric Report entitled, "Impact of Steam Carryover Fraction on Process Computer Heat Balance Calculations, September 2001." This report states that the assumed carryover fraction in later model Boiling Water Reactors is non-conservative with respect to heat balance calculations. The potential effect of this non-conservative assumption is that the calculated core thermal power could be as much as approximately 0.082% lower than the actual core thermal power. Consequently, it is assumed that the plant has operated at reactor core power levels in excess of the licensed power level by approximately 0.082%, or approximately 3 megawatts thermal (MWth).</br></br>Due to the small magnitude of the carryover fraction input and the conservatism present in the core thermal power levels used for the safety analyses, the use of the non-conservative steam carryover fraction does not represent a safety issue. As a measure of conservatism, however, an administrative reactor power reduction of 4 MWth was implemented until the process computer thermal power calculation was modified to reflect the revised moisture carryover fraction.</br></br>This issue was reported to the NRC Operations Center via the Emergency Notification System at 1914 on October 1, 2001 (Notification number 38337). This written report is being submitted in accordance with PNPP Operating License Condition 2.F., as a potential violation of the Maximum Power Level specified in PNPP Operating License Condition 2.C.1.in PNPP Operating License Condition 2.C.1. +
October 1, 2001 +
On October 1, 2001, it was determined that … On October 1, 2001, it was determined that a non-conservative assumption for the steam carryover fraction of main steam has been applied in the General Electric methodology for calculating reactor core thermal power at the Perry Nuclear Power Plant (PNPP). This was documented in a General Electric Report entitled, "Impact of Steam Carryover Fraction on Process Computer Heat Balance Calculations, September 2001." This report states that the assumed carryover fraction in later model Boiling Water Reactors is non-conservative with respect to heat balance calculations. The potential effect of this non-conservative assumption is that the calculated core thermal power could be as much as approximately 0.082% lower than the actual core thermal power. Consequently, it is assumed that the plant has operated at reactor core power levels in excess of the licensed power level by approximately 0.082%, or approximately 3 megawatts thermal (MWth).</br></br>Due to the small magnitude of the carryover fraction input and the conservatism present in the core thermal power levels used for the safety analyses, the use of the non-conservative steam carryover fraction does not represent a safety issue. As a measure of conservatism, however, an administrative reactor power reduction of 4 MWth was implemented until the process computer thermal power calculation was modified to reflect the revised moisture carryover fraction.</br></br>This issue was reported to the NRC Operations Center via the Emergency Notification System at 1914 on October 1, 2001 (Notification number 38337). This written report is being submitted in accordance with PNPP Operating License Condition 2.F., as a potential violation of the Maximum Power Level specified in PNPP Operating License Condition 2.C.1.in PNPP Operating License Condition 2.C.1. +
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October 30, 2001 +
October 1, 2001 +
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