Estimated net value and uncertainty for automating ECCS switchover at PWRs

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Question for resolution of Generic Safety Issue No. 24 is whether or not PWRs that currently rely on a manual system for ECCS switchover to recirculation should be required to install an automatic system. Risk estimates are obtained by reevaluating the contributions to core damage frequencies (CDFs) associated with failures of manual and semiautomatic switchover at a representative PWR. This study considers each separate instruction of the corresponding emergency operating procedures (EOPs), the mechanism for each control, and the relation of each control to its neighbors. Important contributions to CDF include human errors that result in completely coupled failure of ... continued below

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128 p.

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Walsh, B.; Brideau, J.; Comes, L.; Darby, J.; Guttmann, H.; Sciacca, F. et al. February 1, 1996.

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Description

Question for resolution of Generic Safety Issue No. 24 is whether or not PWRs that currently rely on a manual system for ECCS switchover to recirculation should be required to install an automatic system. Risk estimates are obtained by reevaluating the contributions to core damage frequencies (CDFs) associated with failures of manual and semiautomatic switchover at a representative PWR. This study considers each separate instruction of the corresponding emergency operating procedures (EOPs), the mechanism for each control, and the relation of each control to its neighbors. Important contributions to CDF include human errors that result in completely coupled failure of both trains and failure to enter the required EOP. It is found that changeover to a semiautomatic system is not justified on the basis of cost-benefit analysis: going from a manual to a semiautomatic system reduces the CDF by 1.7 {times} 10{sup {minus}5} per reactor-year, but the probability that the net cost of the modification being less than $1, 000 per person-rem is about 20% without license renewal. Scoping analyses, using optimist assumptions, were performed for a changeover to a semiautomatic system with automatic actuation and to a fully automatic system; in these cases the probability of a net cost being less than $1,000/person-rem is about 50% without license renewal and over 95% with license renewal.

Physical Description

128 p.

Notes

INIS; OSTI as TI96009348

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  • Other Information: PBD: Feb 1996

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  • Other: TI96009348
  • Report No.: NUREG/CR--6432
  • Report No.: SEASF-DR--94-001
  • DOI: 10.2172/218235 | External Link
  • Office of Scientific & Technical Information Report Number: 218235
  • Archival Resource Key: ark:/67531/metadc664163

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  • February 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • April 8, 2016, 8:18 p.m.

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Walsh, B.; Brideau, J.; Comes, L.; Darby, J.; Guttmann, H.; Sciacca, F. et al. Estimated net value and uncertainty for automating ECCS switchover at PWRs, report, February 1, 1996; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc664163/: accessed November 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.