Clinton Rehost ChallengesClinton Rehost Challenges

Clinton Simulator Rehost ScopeClinton Simulator Rehost Scope

Rehost executive system and instructor station to Opensim

Convert existing ROSE models to Xtreme Upgrade to Windows 7 Upgrade to latest compilers Create full set of panel graphics and P&ID’s

in JADE Deliver 3 vPanel units

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Clinton Simulator Rehost JustificationClinton Simulator Rehost Justification

Simulator fleet standardization Exelon software support model Cost savings associated with fleet model

upgrades

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Clinton Simulator Rehost Project PlanClinton Simulator Rehost Project Plan

Rehost existing Clinton software to Opensim Validated rehost load against current

simulator data Develop new Xtreme models Validated integration using Excel DDE

spreadsheets

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Overview of IssuesOverview of Issues

Compiler and Windows 7 Difficulties Modeling Reactor Feed Pump Turbines Off-Gas Chemistry Discrepancies Repeatability Issues Gland Steam Limitations Other Modeling Complications

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Compiler and Windows 7 Difficulties Compiler and Windows 7 Difficulties

Fortran Issues Unsigned types to signed types: Integer*1 types used as array

indexes can no longer exceed a value of 127. Logical Type Compatibility Issues

Windows 7 administrative privileges 64 Bit Compatibility

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Turbine ModelingTurbine Modeling

Issue: The former simulation used four Reactor Feed Pump

Turbines to model two physical turbines in the plant. The previous model used separate turbines for high pressure

steam flow and low pressure steam flow. Plant data disagreed with simulation data

Turbine Modeling Cont.Turbine Modeling Cont.

Resulting Complications: Incorrect Main Steam Flow to Turbines Inaccurate Main Steam flow to Re-Heater Unclear transition between Low Pressure source and High

Pressure source of steam for running the turbines Difficulties in interfacing the feed pumps Disrupted power balance

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Turbine Modeling Cont.Turbine Modeling Cont.

GSE’s Improvements: Modeled Main Steam System with two Reactor Feed Pump

Turbines Matched the Thermal Kit data received from site instead of

former models. Re-adjusted Feedwater Pump discharge pressure Re-tuned Feedwater Heater temperatures and pressures Modified steam extraction temperatures and pressures Revised the Feed Pump Control Scheme Altered Feed Pump controller constants to better fit plant data

Successfully retuned Main Steam to re-establish the Overall Power Balance

Modified the Feed Pump speed and flow characteristics

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Off Gas Chemistry DiscrepanciesOff Gas Chemistry Discrepancies

Issue: The levels of hydrogen and oxygen weren’t congruent with

the heat output from the Recombiner

Resulting Complications: Incorrect values of hydrogen and oxygen were found coming

from legacy code. An inaccurate value for the heat of formation was found in

previous models which allowed the heat output from Recombiner to appear correct.

GSE’s Improvements: The levels of hydrogen and oxygen entering main steam lines

were adjusted to the correct concentrations to produce the expected Recombiner heat output.

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Repeatability IssuesRepeatability Issues

Issue: Previous simulation dispatcher caused repeatability problems

when running a LOCA and Loss of Off-Site power transient.

Resulting Complications: Fixing the dispatcher resulted in a failed transient due to

asynchronous malfunctions. Poor design of the HPCS control prevented an obvious

solution.

GSE’s Improvements: Resolved repeatability issue by adjusting asynchronous

nature of the LOCA and Loss of Off-Site power malfunctions. Provided a passing LOCA and Loss of Off-Site Power

transient.

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Gland Steam LimitationsGland Steam Limitations

Issue: Existing simulation only modeled one source of Gland Steam

which differed from the plant’s four sources.

Resulting Complications: One source of Gland Steam limits the modeling capabilities

and minimizes simulation potential in relation to actual plant operations.

GSE improvements: GSE modeled all four sources of Gland Steam, increasing

operation capabilities and providing a more realistic model.

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Additional IssuesAdditional Issues

Inaccurate and inconsistent valve stroke timesFalse flow boundaries, flow paths, heat sources\sinksInaccurate data entered in modelsFeed pump curve data inconsistent with simulation

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