MEETING WITH WOLF CREEK NUCLEAR OPERATING CORPORATION (LICENSEE)

RELATED TO WOLF CREEK GENERATING STATION

MAIN STEAM AND FEEDWATER ISOLATION SYSTEM (MSFIS) REPLACEMENT PROJECT

MEETING HELD JUNE 28, 2006

DOCKET NO. 50-482

Attached is the 20-page handout from the licensee for the meeting.

Main Steam & Feedwater Isolation System(MSFIS)

Controls Replacement Project

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Agenda

* Main Steam & Feedwater Isolation Replacement Project* Current MSFIS Controls* Replacement MSFIS Controls* Advanced Logic System (ALS)• Development Team and Development Process• Regulatory Process

* Questions

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Project Overview

• Replace existing hydraulically operated MSIV and MFIVactuators with actuators operated by process fluids

* Replace MSIV and MFIV bodies

* Replace existing MSFIS Controls

* Installation of MSIV/MFIVs and controls is schedule for RF16,April 2008

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Current MSFIS Controls

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Current MSFIS Controls

Current MSFIS Controls are a digital control system- Boards are based on discrete logic IC's along with common analog signal

conditioning components for interfacing with field I/O- Valve Control Module, which is the key module, is custom to the

application- Board interconnection is custom to the application- Test Panel provides limited test capability

° Issues with current MSFIS controls- Becoming less reliable

" Plant Trip due to circuit card failure" Recent circuit failures have caused valves to stroke partially closed

- Troubleshooting requires a significant effort- Multiple single point vulnerabilities which can cause plant transients- Obsolete components- Current Valve Control Module logic will not operate the replacement

actuators

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Current MSFIS Controls Architecture

Field Input:MCB HandSwitchesESFAS,Valve LimitSwitches

Relay Driver

Field Outputs:SolenoidsStatus PanelSafeguards Test

I I I I

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Replacement MSFIS Controls

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Replacement MSFIS Controls

Goals of the Replacement MSFIS Controls- Operate replacement actuators- Eliminate single point vulnerabilities within the control system- Improve testability to both improve test coverage and reduce

manpower required for maintaining the system- Improved diagnostics to enhance troubleshooting capabilities- Mitigate future obsolescence issues- Implement a scalable architecture to allow future systems to be

replaced with a common platform- Retain existing safety system architecture, maintain a low level

of complexity

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Advanced Logic System (ALS)CORE LOGIC BOARD

- Deterministic - The system behaves thesame all the time, it's fully predictable

- Single Failure Proof - Systemarchitecture is designed such that nosingle failure will cause a false actuation

- Fault Tolerant - Detects a fault andplaces system in a safe state and notifiesthe control operators

- Modular - Boards are autonomous, afailure of one board does not cause failuresin other boards

-Scalable - The system is built fromstandard modules, no module is designedspecific to a particular application

- Advanced Diagnostics - Plantpersonnel can interface with the system fortroubleshooting and other diagnosticsactivities

INPUT BOARD

INPUT BOARD

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OUTPUT BOARD

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OUTPUT BOARD

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SERVICE & TEST BOARD

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Advanced Logic System (ALS) Overview- Logic Based Architecture

" Standard logic implemented in field programmable gate array (FPGAs)• Logic elements are pre-built, FLASH cells 'wire' the logic elements together

similar to discrete logic on a printed circuit board• Logic and test vectors are portable, providing protection to future

obsolescence- Testable

" System allows for thorough testing during the development process" Deterministic testing - same behavior every time" Run-Time testing - applied to continually verify system integrity" FPGA logic incorporates Built-In Self Test (BIST) engines

- Reliable" Simple and stable architecture

- No Stack/Heap/Interrupt overflow/underflow/overwrite

" Only deploys digital flip-flop's and protected FLASH cells' for storage- No SRAM or program FLASH issues

" Boards are a simple design with a small number of components (ascompared to current discrete system or a microprocessor based system),which means there are less components to fail

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"Advanced Logic System (ALS) FPGA's- FPGA Types

" FLASH - rad tolerant, highly reliable, reprogrammable* Anti-FUSE - rad hard, highly reliable, one time programmable" SRAM - complex system-on-chip high speed, commercial

applications

- ALS utilizes the Actel FLASH FPGAs* Application is low gate count implementing only standard logic* Implements simple design practices9 High radiation survivability is not critical, as in Space applications

Actel FPGA's" Products focused on high reliability applications" Widely used in Military, Avionics, and Aerospace Industry's" Proven development tools with qualifications meeting Military,

Avionics, and Aerospace requirements

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Development Process

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MSFIS Controls Project Team

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Development Life Cycle

Concept Requirements DesignPhase Phase Phase

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PhaseSystem

IntegrationAnd Test

Phase

InstallationPhase

Validation

VerificationValidation

Testing

Verification

Verification

Verification

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Project Milestones

Customer Requirements Jun-06

MSFIS System Specification Jul-06

ALS Design Specifications Sep-06

Qualification Testing Oct-06

Qualification Test Report Jan-07

V&V Report Jan-07

LAR Submittal Mar-07

Factory Acceptance Test Jul-07

Site Acceptance Test Sep-07

Installation Apr-08

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Regulatory Process

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Regulatory Process

License Amendment Request- TS 3.3.2, Function 4, Steam Line Isolation, and Function 5,

Turbine Trip and Feedwater Isolation* Add new sub-Functions for MSFIS Automatic Actuation Logic and

Actuation Relays- TS 3.7.2/TS 3.7.3 - MSIV/FWIV Closure Times (SR 3.7.2.1/SR

3.7.3.1)* Limits will be moved to the TS Bases based on TSTF-491, Rev. 2

- TS 3.7.3 - Addition of Main Feedwater Regulating Valves andBypass Valves (consistent with NUREG-1431, _W Standard TS)

- TS 3.7.3 - Extend Completion Time for one or more MFIVsinoperable from 8 hours to 72 hours (consistent with NUREG-1431, W Standard TS)

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Questions?

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