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On May 23, 2001 it was determined that a c … On May 23, 2001 it was determined that a condition had existed resulting in an unanalyzed condition that could potentially degrade plant safety in that separation requirements between trains of safe shutdown equipment were not met. An evaluation of twenty-nine large penetration fire seals concluded that there is insufficient industry and test data to ensure that they can be rated as three-hour fire barriers as is required by 10 CFR Part 50 Appendix R.</br></br>Appendix R defines required separation requirements for safe shutdown equipment to protect the plant in the event of a fire. These penetrations are located throughout both units. The cause of this event is inadequate design in that the fire penetration seals associated with this event were designed and installed without sufficient verification of their rating as three-hour fire barriers. Fire watches have been established since November 8, 2000 in the areas affected by these seals and will continue until this condition is corrected. Modifications are being planned to upgrade these seals to provide a three-hour fire barrier as is required by Appendix R. On June 20, 2001 Southern Nuclear Operating Company's (SNC's) designers identified additional large seals that needed further evaluation. Additional fire watches were established to address these seals. Of these, sixteen have been subsequently determined not to meet three-hour fire barrier rating requirements. Appropriate compensatory actions will be maintained until upgrades are completed. Additional review of fire barrier penetrations in question will be completed by 180 days from the report date of this LER.180 days from the report date of this LER. +
On May 23, 2001 it was determined that a c … On May 23, 2001 it was determined that a condition had existed resulting in an unanalyzed condition that could potentially degrade plant safety in that separation requirements between trains of safe shutdown equipment were not met. An evaluation of twenty-nine large penetration fire seals concluded that there is insufficient industry and test data to ensure that they can be rated as three-hour fire barriers as is required by 10 CFR Part 50 Appendix R.</br></br>Appendix R defines required separation requirements for safe shutdown equipment to protect the plant in the event of a fire. These penetrations are located throughout both units. The cause of this event is inadequate design in that the fire penetration seals associated with this event were designed and installed without sufficient verification of their rating as three-hour fire barriers. Fire watches have been established since November 8, 2000 in the areas affected by these seals and will continue until this condition is corrected. Modifications are being planned to upgrade these seals to provide a three-hour fire barrier as is required by Appendix R. On June 20, 2001 Southern Nuclear Operating Company's (SNC's) designers identified additional large seals that needed further evaluation. Additional fire watches were established to address these seals. Of these, sixteen have been subsequently determined not to meet three-hour fire barrier rating requirements. Appropriate compensatory actions will be maintained until upgrades are completed. Additional review of fire barrier penetrations in question will be completed by 180 days from the report date of this LER.180 days from the report date of this LER. +
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