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The following information was provided by … The following information was provided by Framatome ANP</br>The turbine generator load rejection with failure of the turbine bypass valves to open event (LRNB) is a potentially limiting anticipated operational occurrence (AOO) considered in establishing the MCPR operating limit and confirming that the linear heat generation rate (LHGR) limits are adequate. Framatome ANP analyses for the LRNB event assume that the load rejection will initiate a fast closure of the turbine control valves (TCV) at all power levels. Some plants have indicated that the fast closure of the TCV is not initiated below a plant specific power level. The fast closure of the TCV initiates a scram and minimizes turbine over speed. If a fast closure of the TCV does not occur, the TCV will close at a slower rate, scram will be delayed, and the turbine will overspend. This may increase the severity of the event. The turbine overspend may result in an increase in recirculation pump speed that will also increase the severity of the event.</br>The affected plants LaSalle Unit 2 Cycle 10 and Browns Ferry Unit 3 Cycle 12 have been notified. A set of revised operating limits, which are appropriate for the conditions when a fast closure of the TCV does not occur, have been provided to the affected plants.have been provided to the affected plants. +
08:00:00, 14 January 2005 +
41,335 +
14:10:00, 14 January 2005 +
08:00:00, 14 January 2005 +
The following information was provided by … The following information was provided by Framatome ANP</br>The turbine generator load rejection with failure of the turbine bypass valves to open event (LRNB) is a potentially limiting anticipated operational occurrence (AOO) considered in establishing the MCPR operating limit and confirming that the linear heat generation rate (LHGR) limits are adequate. Framatome ANP analyses for the LRNB event assume that the load rejection will initiate a fast closure of the turbine control valves (TCV) at all power levels. Some plants have indicated that the fast closure of the TCV is not initiated below a plant specific power level. The fast closure of the TCV initiates a scram and minimizes turbine over speed. If a fast closure of the TCV does not occur, the TCV will close at a slower rate, scram will be delayed, and the turbine will overspend. This may increase the severity of the event. The turbine overspend may result in an increase in recirculation pump speed that will also increase the severity of the event.</br>The affected plants LaSalle Unit 2 Cycle 10 and Browns Ferry Unit 3 Cycle 12 have been notified. A set of revised operating limits, which are appropriate for the conditions when a fast closure of the TCV does not occur, have been provided to the affected plants.have been provided to the affected plants. +
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