05000313/FIN-2013011-05
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Finding | |
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Title | Flood Barrier Effectiveness |
Description | On March 31, 2013, a significant fire water leak was created inside the turbine building train bay from a ruptured eight-inch fire header. At 8:30 a.m. Unit 1 operators documented auxiliary building sump water level rise due to firewater leaking into the auxiliary building. The water from the firewater system leaked past the flood barriers installed in hatches in the train bay and filled the building sump, eventually accumulating on the 317-foot elevation of the Unit 1 auxiliary building. The loss of offsite power prevented the auxiliary building sump pumps from operating. At approximately 11:42 a.m., Unit 1 operations staff noted that approximately one inch of water had accumulated in decay heat vault B located on the 317-foot elevation of the auxiliary building. Water entered the decay heat vault through a leaking room drain isolation valve, ABS-13, located in the auxiliary sump area. The water accumulation in the vault reached a maximum of approximately one-inch and did not affect any emergency core cooling equipment in that room. The water rise in the auxiliary building stopped when operators secured the fire water system. The licensee deployed temporary air-driven sump pumps to the 317-foot elevation of the Unit 1 auxiliary building to remove the accumulated water. The team concluded that additional inspection was required to determine the causes and impact of the failed flood hatches and the decay heat vault B room drain isolation valve: Unresolved Item URI 05000313/2013011-05, Flood Barrier Effectiveness. |
Site: | Arkansas Nuclear |
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Report | IR 05000313/2013011 Section 4OA5 |
Date counted | Jun 30, 2013 (2013Q2) |
Type: | URI: |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 93800 |
Inspectors (proximate) | B Latta G Werner J Melfi L Willoughby N Okonkwoa Sanchezd Allen D Loveless G Miller J Watkins S Jonesb Tindelld Loveless G Werner J Melfi |
INPO aspect | |
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Finding - Arkansas Nuclear - IR 05000313/2013011 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2013Q2
Self-Identified List (Arkansas Nuclear)
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