05000259/FIN-2014002-02
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Finding | |
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| Description | The inspectors identified a self-revealing URI for the licensees inadequate corrective action for PER 119954 action number 119954-001. The action was to modify the suction depth for a sump pump and add a warning light in hand hole number 15 to prevent standing water from covering RHR service water power cables. The modified sump pump and warning light did not prevent several power cables in hand hole number 15 from becoming wetted. Description: Browns Ferry has RHR service water pump power cables routed underground for protection from potential hazards. There are two divisions of RHR service water pumps. One division has power cables routed through hand hole number 15. A hand hole is an underground cable vault that is accessible from above ground by removing an access cover. Browns Ferry inspected the hand hole for standing water at least once per year as a license renewal commitment due to a history of power cable failures due to wetting. The RHR service water power cables that are routed through hand hole number 15 were discovered to be covered in water in 2001. As part of their corrective actions, the licensee installed a sump pump to remove standing water prior to the power cables becoming wetted. In 2007, the power cables in hand hole 15 failed, in part due to being wetted, and as part of the extent of cause review, the licensee determined that the installed sump pump suction was not low enough in the hand hole to prevent the power cables from becoming wetted. As part of their corrective actions under PER 119954, the licensee installed a new sump pump and lowered the pump suction depth to prevent power cable wetting and installed a warning light on the hand hole to provide a visual alert to rising water levels prior to power cables becoming wetted. The licensee also replaced the power cables with a water impervious design built to the draft IEEE 1142-2009 standards. During a licensee inspection of hand hole number 15 on January 17, 2014, the licensee discovered that standing water covered several of the RHR service water power (safety related) cables. The new sump pump and sensor depth for the warning light were insufficient to prevent the safety related cables in hand hole 15 from becoming wetted revealing that the corrective actions from PER 119954 were ineffective. As of April 1, 2014, the standing water had not been removed. The licensee planned to remove the standing water under WO 115447734 as documented in PER 834650 and 836589. URI 05000259, 260, 296/2014-002-02, -Inadequate Corrective Action for sump pump in Hand hole 15 allowing RHRSW pump power cables to be submerged in water without the pump operating, was opened to allow for a NRC verification of the power cables rating for continuous submergence to determine if this performance deficiency is more than minor. |
| Site: | Browns Ferry  |
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| Report | IR 05000259/2014002 Section 1R06 |
| Date counted | Mar 31, 2014 (2014Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.06 |
| Inspectors (proximate) | A Nielsen C Fontana C Kontz D Dumbacher J Bartley L Pressley R Kellner S Sanchez T Stephenc Kontzd Dumbacher J Bartley L Pressley M Coursey R Hamilton T Stephen W Pursley |
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Finding - Browns Ferry - IR 05000259/2014002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2014Q1
Self-Identified List (Browns Ferry)
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