05000341/FIN-2016002-03

Finding

Title

Loss of Power Instrumentation TS 3.3.8.1 Applicability Following Bus 64C Potential Transformer Fuse Failures

Description

Loss of Power Instrumentation TS 3.3.8.1 Applicability Following Bus 64C Potential Transformer Fuse Failures Introduction. The inspectors opened an Unresolved Item to further evaluate the applicability of TS 3.3.8.1, Loss of Power (LOP) Instrumentation, following the failure of potential transformer fuses that caused half of the bus 64C LOP and degraded voltage relays to de-energize. Description. On April 24, 2016, a loss of output from the line to neutral potential transformers occurred on 4160 volt AC busses 64A and 64C. This resulted in the loss of bus indications, loss of automatic control of station transformer 64 load tap changer, and actuation of half of the LOP and degraded voltage relaying for safety-related bus 64C. The licensee subsequently discovered all six of the primary side fuses to the potential transformers had blown. Although the actual cause for the blown fuses was not conclusively determined, the most likely cause was attributed to an intermittent low energy transient on the secondary side of station transformer 64 or a transient on the 120 kilovolt electrical grid supplying the transformer. The inspectors noted the licensee did not consider the de-energized LOP and degraded voltage instrument channels to be inoperable, and therefore, did not enter the applicable action requirements of TS 3.3.8.1. The licensee had concluded the affected LOP and degraded voltage instrument channels remained operable since their safety function was believed to have been satisfied while they were de-energized and tripped. The inspectors raised several questions with the licensee concerning the operability of the affected LOP and degraded voltage instrument channels. The questions included whether the potential transformers were part of the LOP and degraded voltage instrumentation described in TS 3.3.8.1 and whether applicable surveillance requirements had been satisfied for the instrumentation prior to and during the event. The licensee entered this issue into its corrective action program as CARD 1625194 for further evaluation. This issue of concern is considered an Unresolved Item pending additional review by the inspectors to determine whether the licensee had correctly applied the TS limitations and satisfied applicable regulatory reporting requirements (URI 05000341/201600203, Loss of Power Instrumentation TS 3.3.8.1 Applicability Following Bus 64C Potential Transformer Fuse Failures).

03
Site:	Fermi
Report	IR 05000341/2016002 Section 1R15
Date counted	Jun 30, 2016 (2016Q2)
Type:	URI: Green
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:	IP 71111.15
Inspectors (proximate)	B Kemker G Hansen I Hafeez K Pusateri K Riemer M Beilby T Briley V Myersb Dicksonb Kemker G O'Dwyer I Khan J Bozga M Doyle M Jones P Smagacz V Myers V Petrella
Violation of:	Pending
CCA	H.9, Training
INPO aspect	CL.4
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v • d • e

Finding - Fermi - IR 05000341/2016002

8(0)1(12)2(7)3(3)4(6)5(0)6(0)7(16)201(1)403(0)404(0)405(0)406(1)502(0)

IR 05000341/2016002: 1 2 3 4 5 6 7

Finding List (Fermi) @ 2016Q2

CCA Matrix: 2016Q2

	Q	CCA	Title
05000341/FIN-2015003-01	2015Q3		Inadequate Simulator Fidelity Regarding the Ability to Model Thermal-Hydraulic Instabilities
05000341/FIN-2015301-01	2015Q3		Inadequate Examination Security on a Simulator Reset
05000341/FIN-2015003-05	2015Q3		Failure to Maintain Adequate Procedures to Respond to Thermal-Hydraulic Instabilities
05000341/FIN-2015003-04	2015Q3	P.5	Failure to Perform Preventive Maintenance on SafetyRelated Auxiliary Trip Unit Relays for the Spent Fuel Pool Ventilation Exhaust Radiation Monitors
05000341/FIN-2015003-02	2015Q3	H.6	Failure to Incorporate Operating Experience Into Preventive Maintenance Activities Associated With RPS Timing Relays
05000341/FIN-2015003-06	2015Q3	H.13	Failure to Adequately Assess Plant Impact for Post-Maintenance Testing on RBHVAC
05000341/FIN-2015003-03	2015Q3	P.1	Failure to Establish Correct Classification and Preventive Maintenance for Reactor Recirculation Pump Flow Switches
05000341/FIN-2015406-01	2015Q3	H.12	Security
05000341/FIN-2015004-01	2015Q4	H.12	Failure to Satisfy Technical Specification Requirements During an Unplanned Operation with the Potential to Drain the Reactor Vessel
05000341/FIN-2015007-01	2015Q4	P.2	Failure to Comply with ASME B30.16 for Planned Engineered Lifts
05000341/FIN-2015403-01	2015Q4		Security
05000341/FIN-2016001-02	2016Q1	H.14	Failure to Correctly Interpret and Implement TS Requirements for RPS Trip Functions
05000341/FIN-2016001-10	2016Q1		Failure to Satisfy 10 CFR 50.72 and 10 CFR 50.73 Reporting Requirements for Primary Containment Isolation Valve Actuations
05000341/FIN-2016001-05	2016Q1		Failure to Satisfy 10 CFR 50.73 Reporting Requirements for a Condition Prohibited by the Plants Technical Specifications
05000341/FIN-2016001-03	2016Q1		Failure to Satisfy 10 CFR 50.72 and 10 CFR 50.73 Reporting Requirements for Loss of RPS Trip Safety Functions
05000341/FIN-2016001-04	2016Q1	P.4	Failure to Incorporate Operating Experience into Preventive Maintenance Activities Associated with the TBCCW System
05000341/FIN-2016001-09	2016Q1	H.1	Inadvertent Reactor Water Low Level Reactor Protection System Actuation Due to Operator Error
05000341/FIN-2016001-08	2016Q1		Failure to Follow Apparent Cause Evaluation Procedure
05000341/FIN-2016001-07	2016Q1		Inadequate Test Criteria in SGTS Flow/Heater Operability Surveillance Test
05000341/FIN-2016001-06	2016Q1		Failure to Translate Design Requirements of the RHRHVAC System into Procedures
05000341/FIN-2016001-01	2016Q1		Failure of the Plant-Referenced Simulator to Demonstrate Expected Plant Response for Safety Relief Valves
05000341/FIN-2016002-06	2016Q2		Failure to Implement Adequate Preventive Maintenance on Spare Terminals in Safety-Related Motor Control Centers
05000341/FIN-2016002-05	2016Q2		Failure to Use Correct Material in a Feedwater Heater Level Control Valve Resulted in a Loss of Feedwater Heater Drains and a Reactor Recirculation System Runback
05000341/FIN-2016002-04	2016Q2	P.2	Failure to Control the Work Hours of Covered Workers
05000341/FIN-2016002-02	2016Q2		Inadequate Test Procedure Used for Measuring and Determining Average Silt Levels in the Service Water Reservoir
05000341/FIN-2016201-01	2016Q2		Security
05000341/FIN-2016002-03	2016Q2	H.9	Loss of Power Instrumentation TS 3.3.8.1 Applicability Following Bus 64C Potential Transformer Fuse Failures
05000341/FIN-2016002-01	2016Q2	H.12	Failure to Control Combustible Materials
05000341/FIN-2016406-01	2016Q2	H.13	Security

Self-Identified List (Fermi)

	Q	Title
05000341/FIN-2015004-02	2015Q4	Licensee-Identified Violation
05000341/FIN-2016001-11	2016Q1	Licensee-Identified Violation
05000341/FIN-2016001-12	2016Q1	Licensee-Identified Violation
05000341/FIN-2016002-07	2016Q2	Licensee-Identified Violation

[Fermi Findings full list]

05000341/FIN-2016002-03

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