05000305/FIN-2012002-01
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Finding | |
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Title | Incorrectly Modeled Ventilation Damper Changes Daily Risk Color |
Description | During the daily review of CRs, inspectors reviewed CR464332, which documented that cross connect damper TAV-82, which connected two trains of turbine building ventilation, was modeled in the licensees probabilistic risk assessment (PRA) tool as open, when the actual position of the damper was closed. When the licensees PRA tool was updated with the correct damper position, the daily risk calculated to comply with 10 CFR 50.65(a)(4) increased from green to orange on train B, and from green to red on train A. The licensee reevaluated the model taking credit for a nonsafety-related (NSR) general turbine building ventilation system that also provided air flow to the two rooms in question and the risk was reduced. The updated model for the removal of a TBFCU from service maintained green risk for train B and only increased train A to yellow risk. At the conclusion of the inspection period the inspectors needed additional information to determine if an error in the original inputs to the base PRA tool, versus an error in the daily application of the PRA tool, was a violation of 10 CFR 50.65(a)(4). As a result, this item was considered unresolved |
Site: | Kewaunee |
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Report | IR 05000305/2012002 Section 1R13 |
Date counted | Mar 31, 2012 (2012Q1) |
Type: | URI: |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.13 |
Inspectors (proximate) | R Winter K Riemer J Jandovitz R Krsek V Meghani K Barclay A Shaikh V Myersd Mcneilk Riemer R Krsek K Barclay A Shaikh |
INPO aspect | |
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Finding - Kewaunee - IR 05000305/2012002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Kewaunee) @ 2012Q1
Self-Identified List (Kewaunee)
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