05000341/FIN-2015003-01

Finding

Title

Inadequate Simulator Fidelity Regarding the Ability to Model Thermal-Hydraulic Instabilities

Description

The inspectors opened an Unresolved Item (URI) to further evaluate the capability of the Fermi 2 simulator to model core thermal-hydraulic instabilities, to evaluate the adequacy of licensed operator training using the plant simulator for response to the condition, and to determine whether a noncompliance with the regulatory requirements exists. Description: On March 19, 2015, Fermi 2 received an automatic reactor scram signal generated from the oscillation power range monitor (OPRM) logic of the reactor protection system. As discussed in Section 4OA3.1 of this inspection report, following the transition of the unit to single loop operation due to the loss of a reactor recirculation pump, licensed operators failed to stabilize the plant while operating in a region of core thermal-hydraulic instability on the Power-to-Flow Map due to inadequate procedures. The result was a reactor scram. During review of this event, the inspectors questioned whether licensed operator training and the licensees simulator were adequate to prepare the operators to respond to the condition. Currently, the Fermi 2 plant simulator does not model core thermal-hydraulic instability under the high power and low flow conditions experienced on March 19; however, the training staff is able to artificially introduce the instability in the simulator in certain scenarios. The inspectors questioned whether the modeling of thermal-hydraulic instability falls under the requirements of Title 10 of the Code of Federal Regulations (10 CFR) 55.46(c)(1), which requires the simulator to demonstrate expected plant response to operator input and to normal, transient, and accident conditions. This issue of concern is considered a URI pending additional review by the NRCs operator licensing inspectors (URI 05000341/201500301, Inadequate Simulator Fidelity Regarding the Ability to Model Core Thermal-hydraulic Instabilities).

01
Site:	Fermi
Report	IR 05000341/2015003 Section 1R11
Date counted	Sep 30, 2015 (2015Q3)
Type:	URI:
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:	IP 71111.11
Inspectors (proximate)	B Dickson B Kemker C Zoia G Hansen N Egan P Smagacz R Walton S Bell T Bilik T Brileya Shaikhb Kemker G Hansen J Wojewoda M Kunowski P Smagacz R Walton S Bell T Briley
INPO aspect
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v • d • e

Finding - Fermi - IR 05000341/2015003

10(0)1(4)2(1)3(6)4(2)5(0)6(0)7(1)8(4)9(0)301(1)403(1)404(0)406(1)407(0)408(0)501(0)

IR 05000341/2015003: 1 2 3 4 5 6

Finding List (Fermi) @ 2015Q3

CCA Matrix: 2015Q3

	Q	CCA	Title
05000341/FIN-2014005-03	2014Q4		Spent Fuel Pool Securement of Irradiated Local Power Range Monitors
05000341/FIN-2014005-04	2014Q4	H.2	Failure to Maintain Radiation Exposure ALARA During RF-16
05000341/FIN-2014005-01	2014Q4	H.12	Potential Missile Hazards from Unrestrained Equipment Near the 345-Kilovolt and 120-Kilovolt Switchyards
05000341/FIN-2014403-04	2014Q4		Security
05000341/FIN-2014403-03	2014Q4		Security
05000341/FIN-2014403-02	2014Q4		Security
05000341/FIN-2014403-01	2014Q4		Security
05000341/FIN-2014406-01	2014Q4		Security
05000341/FIN-2014005-02	2014Q4	P.2	Failure to Perform an Operability Determination for Partially Submerged EDG Cables
05000341/FIN-2015008-02	2015Q1		Temporary Change Notice Administrative Conduct Manual MGA04 Deficiency
05000341/FIN-2015008-03	2015Q1		Inadequate 10 CFR 50.59 Evaluation for the On-Line NobleChemTM Process
05000341/FIN-2015001-03	2015Q1		Unplanned Scrams Per 7,000 Critical Hours Performance Indicator Question
05000341/FIN-2015001-04	2015Q1	H.8	Operation Above the Licensed Thermal Power Limit
05000341/FIN-2015001-02	2015Q1	H.1	Failure to Perform Functionality Assessments for Degraded and Nonconforming Plant Conditions
05000341/FIN-2015001-01	2015Q1	H.2	Failure to Correct a Nonconforming Condition Adversely Affecting Plant Safety with the Reactor Building Steam Tunnel Floor Drain
05000341/FIN-2015008-04	2015Q1	H.14	Failure to Test the Electrical Characteristics for Control Power Transformers to Verify the Degraded Voltage Calculations Results
05000341/FIN-2015008-01	2015Q1		Failure to Translate TS 3.7.4 Requirements Correctly into Plant Procedures
05000341/FIN-2015002-01	2015Q2		Failure to Maintain Self-Contained Breathing Apparatus Components
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-2015301-01	2015Q3		Inadequate Examination Security on a Simulator Reset
05000341/FIN-2015003-01	2015Q3		Inadequate Simulator Fidelity Regarding the Ability to Model Thermal-Hydraulic Instabilities

Self-Identified List (Fermi)

	Q	Title
05000341/FIN-2014406-02	2014Q4	Licensee-Identified Violation

[Fermi Findings full list]

05000341/FIN-2015003-01

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