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KMID : 0371819980300010047
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Nuclear Engineering and Technology
1998 Volume.30 No. 1 p.47 ~ p.57
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Establishment of the Procedure to Prevent Boron Precipitation During Post-LOCA Long Term Cooling for WH 3-Loop NPPs
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Cho, H.R.
Lee, S.K./Ban, C.H./Hwang, S.T./Chang, B.H.
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Abstract
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Boric acid concentrations of the refueling water storage tank and the accumulators for Westinghouse 3-loop type plants are increased to meet the post loss of coolant accident shutdown requirement for the extended fuel cycles from 12 months to 18 months. To maintain long term cooling capability following a LOCA, the switchover time is examined using BORON code to prevent the boron precipitation in the reactor core with the increased boron concentrations. The analysis results show that hot leg recirculation switchover times are shortened to 7.5 hours from 24 hours after the initiation of LOCA for Kori 3&4 and 8 hours from 18 hours for Ulchin 1&2, respectively. The flow path in the mode J for Kori 3&4 is recommended to realign to the simultaneous recirculation of both hot and cold legs from the cold leg recirculation, as done by Ulchin 1&2.
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