05000528/FIN-2014003-02
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Palo Verde Nuclear Generating Station Unit 1 Operating License Condition 2.C(7), Unit 2 Operating License Condition 2.C(6), and Unit 3 Operating License Condition 2.F required, in part, that the licensee implement and maintain, in effect, all provisions of the approved fire protection program as described in the Final Safety Analysis Report for the facility, as supplemented and amended, and as approved in the Safety Evaluation Report (SER), through Supplement 11. Palo Verde Nuclear Generating Station Updated Final Safety Analysis Report, Section 9.5.1.3, stated, in part, that fire protection has been achieved consistent with 10 CFR Part 50, Appendix R, Part III, Sections G, J, and O. Appendix R,Section III.G.2, states, in part, that where cables or equipment, including associated non-safety circuits that could prevent operation or cause maloperation due to hot shorts, open circuits, or shorts to ground, of redundant trains of systems necessary to achieve and maintain hot shutdown conditions, are located within the same fire area outside of primary containment, one of three means of protecting cables to ensure that one of the redundant trains is free of fire damage shall be provided. Contrary to the above, on October 4, 2013, the licensee identified that non-safe shutdown cables that shared common electrical cable trays with safe shutdown cables were not electrically protected, and therefore, did not provide means of protecting the cables to ensure that the credited train of safe shutdown equipment would be free of fire damage. Specifically, the licensee identified that the battery ammeter circuits which provide control room current indication for the train B and D, class 1E batteries and battery chargers do not include overcurrent protection features to limit fault current. During a postulated fire event in the control room, fire-induced failures could have damaged the ammeter circuits, resulting in a secondary fire and damage to other safe shutdown cables that are in direct physical contact with these cables, which could affect the availability of equipment needed to place the plant in a safe shutdown condition. A senior reactor analyst performed a detailed risk evaluation and the bounding change to the core damage frequency was less than 3.6E-7/year. The dominant core damage sequences involved a control room fire initiating event in Panel B01, a secondary cable fire in a cable tray associated with one train of safety related equipment, and having the alternate train of safety related equipment out of service for maintenance. The low fire frequency and the normal train separation and protection, that are required by the fire protection program, helped to minimize the significance. The licensee entered this violation into its corrective action program as Condition Report/Disposition Request 4458522. The licensee established compensatory measures in the affected fire zones and initiated corrective actions to install fuses in the affected circuits. The licensee submitted Licensee Event Report 05000528;529;530/2013-003-00 to report this issue. Refer to Section 4OA3 of this inspection report for the review and closure of the licensee event report. |
| Site: | Palo Verde  |
|---|---|
| Report | IR 05000528/2014003 Section 4OA7 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | B Parks D Reinert G George G Guerra J Drake M Baquera N Okonkwo T Brown T Skaggs Ryan W Sifre |
| Violation of: | 10 CFR 50 Appendix R License Condition - Fire Protection License Condition |
| INPO aspect | |
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Finding - Palo Verde - IR 05000528/2014003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palo Verde) @ 2014Q2
Self-Identified List (Palo Verde)
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