ML22252A157
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ML22252A157 | |
Person / Time | |
---|---|
Site: | University of Texas at Austin |
Issue date: | 08/10/2022 |
From: | University of Texas at Austin |
To: | Office of Nuclear Reactor Regulation |
Wertz G | |
Shared Package | |
ML22252A158 | List: |
References | |
Download: ML22252A157 (19) | |
Text
UT TRIGA Control System Upgrade Phase 0 Meeting
Overview
- Motivation
- Plans and Strategy
- Status
Motivation: NETL History
- Initial criticality 1992
- Control system, digital I&C integrated with analog safety system
- Digital with 2 compiled software sets, 2 operating systems
- Operator interface, General Atomics software, windows platform
- Hardware interface, QNX
- Current system is the original system with few peripheral upgrades
- Tektronix recorder display, relaced with a PC based emulator
- RMS II & area monitors replaced with Ludlum, display networked monitors
- GA effluent monitor replaced with Canberra, display networked monitor
Motivation: Limiting Characteristics
- The compiled drivers cannot be modified
- Drivers support original equipment and cannot be updated
- Additional computers & displays required to support peripherals
- Virtually all equipment is obsolete
- Cannot be replaced
- Cannot be updated
- Repair parts via cannibalization
- Multiple annual requests for DOE NEUP support unsuccessful
Contingency Planning
- Continue requests for DOE NEUP support
- Search for Tech Support to rewrite software to allow changing drivers
- QNX not interested
- Austin is a TechHub with many system integrators
- Local software companies declined request for proposal
- Strategy developed for alternate funding profile
Strategy for Alternate Funding Profile
- Identify potential sources
- Phased Upgrade for incremental implementation
- Use the GA system for development and customization of controls
- Replace obsolete equipment with current COTS equipment
- Address currently identified need for improvements NOTE: The initial phasein for the solution was inprogress, supported by other funds, at notification of 20222023 NEUP award
Phased upgrade
- Essentially updated version of the 1992 system
- Discrete stages for implementation as funds available
- Simple and transparent changes
- Configurable software to support indefinite life extension
- Some optimization based on operating experience
- Request for proposal submitted to Plantation Productions, Inc.
Equipment Replacement (1/3)
- Current generation computers replace 286 PCs
- Ethernet based data acquisition hardware replaces Digital and Analog I/O running on IA/IBMPC AT bus
- New NETL LINUX & General Atomics software
- Replacing Windows 3.0 and QNX 4.25
- DOW installation pending
- Power level channels
- Current NM1000, replaced by NLW1000 and NMP1000
- Addition of a Compensated Ion Chamber
- Obsolete NP1000 & NPP1000 replaced by current generation
Equipment Replacement (2/3)
- COTS signal processing modules for Action Paks:
- Fuel temperature modules with current generation standalone instruments
- Water temperature modules with Ethernet based RTD module
- Magnet power ground module
- Isolation/converter modules for analog bar graph display
- Ethernet singleboard computer rod control managing:
- Electromagnets
- Limit switches
- Rod position indication
- Performance of rod drop timing calculations Replaces functionality of the Labmaster board
Equipment Replacement (3/3)
- NPP1000 for Labmaster board pulse monitoring function
- HD displays for Tektronics graphic and text display emulator
Design Optimization (1/3)
- Improve control GA & QNX collects data at 0.1 second intervals
- Reactor power can change significantly in less than 0.1 second
- NM data at 0.2 sec., QNX scan 0.1 sec. creates significant delay in display and control
- Time dependent power level changes are used to calibrate control rods
- Discontinuous jumps in power indication required lowering operating power
- Options under consideration:
- Adjust controller time constants in new system, or
- Develop single board computer using rod drop timer with 0.025 second samples, or
- Develop an embedded system using analog signals
- Isolated analog power level signals, display and/or processing
- If power level display fluctuates, analog display may provide better information
- Option for offline data processing supporting control rod calibration
Design Optimization (2/3)
- Increase sample rate for playback (min. QNX/GA 1 sec., LINUX 0.1)
- Selectable startup channel (AFFRI)
- Configurable for NLW or NMP
- Channel sensitivity may require Technical Specification change
- Prevents single failure for startup channel
- SCRAM logic
- SCRAM Initiation with two channel trip signals (INL/NRAD)
- This will require a Technical Specification change
- Up to four channels will have SCRAM capability
- Permits online calibration, testing and maintenance
- Prevents spurious SCRAMs
Design Optimization (2/3)
- Miscellaneous process instruments upgrade
- Pool level, adding measurement to the float switches for hi/lo and scram
- Conductivity, adding continuous monitoring capability
- Fuel temperature
- adding monitors for all available sensors
- Remove from Technical Specifications
Phase 1: Overall System Requirements/Design
- System Requirements modeled on IEEE 8301998 software requirements
- Software Requirements for GA software on CCS/UIT units
- Block diagrams
- External components list (to be supplied by UT)
- Preliminary list of hardware components
Phase 2 : Design Test Platform
- Custom TINA (Testing, Instruction, No Atomics module)
- Simulation platform for software testing
- Playback system for operating system
Phase 3: Digital Data Acquisition Design/
Construction
- Fabricate 2 UIT computer systems (one for TINA, one for console)
- Fabricate 2 CCS systems
- Build TINA system
- Integrate (watchdog and networking)
- Fabricate single board computers
Phase 4: Software Porting
- Customize GA digital console software system for NETL Software is an upgrade of the existing system
Phase 5: Installation
- Assemble hardware for parallel operation
- Assemble auxiliary rack
- Connect/Disconnect cables for:
- Rod drive controllers
- Analog circuits
- Digital circuits
- Perform wiring
- Integrate and test
- Acceptance testing
- Part I: Reactor secured, simulating signals
- Part II: Reactor operating
Status
- GA Software license acquired
- Site Survey complete
- Notice of NEUP Award for control system upgrade
- Purchase pending, next (Texas) fiscal year (Sep 1)
- General Atomics equipment
- Plantation Productions, Inc