Abstract
Studies on accident management strategies need use of the research findings obtained from the recent PSAs and so on. In order to provide useful information for examining accident management strategies and carrying out experimental and analytical studies for preventing core damage, this report describes a review of the dominant core damage sequences identified for three PWR plant (Surry-1, Sequoyah-1, and Zion-1) in the latest PSA document, NUREG-1150. The dominant sequences which are common to two or three plants are also clarified through the comparison of the dominant sequences for each plant. An example of the former sequences is a station blackout with auxiliary feedwater available followed by battery depletion. As for the latter sequences, medium/small/very small-break LOCAs followed by failure of high pressure injection (HPI) are unique to Surry-1, very small-break LOCAs followed by failure of ECCS recirculation are to Sequoyah-1, and transients followed by reactor coolant pump seal LOCA and subsequent HPI failure are to Zion-1. These unique sequences are ascribed to the plant-specific designs and operating procedures as follows: the lower redundancy of HPI in Surry-1, the more complexity of manual switchover to ECCS recirculation in Sequoyah-1, the lower redundancy of component cooling water and/or service water systems
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Watanabe, Norio
[1]
- Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Citation Formats
Watanabe, Norio.
Review and comparison of dominant core damage sequences in PWRs identified in NUREG-1150.
Japan: N. p.,
1993.
Web.
Watanabe, Norio.
Review and comparison of dominant core damage sequences in PWRs identified in NUREG-1150.
Japan.
Watanabe, Norio.
1993.
"Review and comparison of dominant core damage sequences in PWRs identified in NUREG-1150."
Japan.
@misc{etde_10131578,
title = {Review and comparison of dominant core damage sequences in PWRs identified in NUREG-1150}
author = {Watanabe, Norio}
abstractNote = {Studies on accident management strategies need use of the research findings obtained from the recent PSAs and so on. In order to provide useful information for examining accident management strategies and carrying out experimental and analytical studies for preventing core damage, this report describes a review of the dominant core damage sequences identified for three PWR plant (Surry-1, Sequoyah-1, and Zion-1) in the latest PSA document, NUREG-1150. The dominant sequences which are common to two or three plants are also clarified through the comparison of the dominant sequences for each plant. An example of the former sequences is a station blackout with auxiliary feedwater available followed by battery depletion. As for the latter sequences, medium/small/very small-break LOCAs followed by failure of high pressure injection (HPI) are unique to Surry-1, very small-break LOCAs followed by failure of ECCS recirculation are to Sequoyah-1, and transients followed by reactor coolant pump seal LOCA and subsequent HPI failure are to Zion-1. These unique sequences are ascribed to the plant-specific designs and operating procedures as follows: the lower redundancy of HPI in Surry-1, the more complexity of manual switchover to ECCS recirculation in Sequoyah-1, the lower redundancy of component cooling water and/or service water systems and the larger number of safety-related equipment cooled by them in Zion-1. For the purpose of easily comparing dominant sequences identified for PWRs in future, generic event trees are constructed by using headings suitable for all three plants. These event trees are described in the appendix of this report. (J.P.N.).}
place = {Japan}
year = {1993}
month = {Sep}
}
title = {Review and comparison of dominant core damage sequences in PWRs identified in NUREG-1150}
author = {Watanabe, Norio}
abstractNote = {Studies on accident management strategies need use of the research findings obtained from the recent PSAs and so on. In order to provide useful information for examining accident management strategies and carrying out experimental and analytical studies for preventing core damage, this report describes a review of the dominant core damage sequences identified for three PWR plant (Surry-1, Sequoyah-1, and Zion-1) in the latest PSA document, NUREG-1150. The dominant sequences which are common to two or three plants are also clarified through the comparison of the dominant sequences for each plant. An example of the former sequences is a station blackout with auxiliary feedwater available followed by battery depletion. As for the latter sequences, medium/small/very small-break LOCAs followed by failure of high pressure injection (HPI) are unique to Surry-1, very small-break LOCAs followed by failure of ECCS recirculation are to Sequoyah-1, and transients followed by reactor coolant pump seal LOCA and subsequent HPI failure are to Zion-1. These unique sequences are ascribed to the plant-specific designs and operating procedures as follows: the lower redundancy of HPI in Surry-1, the more complexity of manual switchover to ECCS recirculation in Sequoyah-1, the lower redundancy of component cooling water and/or service water systems and the larger number of safety-related equipment cooled by them in Zion-1. For the purpose of easily comparing dominant sequences identified for PWRs in future, generic event trees are constructed by using headings suitable for all three plants. These event trees are described in the appendix of this report. (J.P.N.).}
place = {Japan}
year = {1993}
month = {Sep}
}