ML17317A931
| ML17317A931 | |
| Person / Time | |
|---|---|
| Site: | Kansas State University |
| Issue date: | 11/07/2017 |
| From: | Edward Helvenston Research and Test Reactors Licensing Projects Branch |
| To: | |
| Helvenston E, NRR/DLP, 415-4067 | |
| References | |
| Download: ML17317A931 (1) | |
Text
ComponentManual Scram SwitchAutomatic Flux Control SystemRod ControlFuel TC GaugesWater TC GaugesArea Rad MonitorsLog ChannelLinear ChannelPercent Power / Pulse ChannelCooling Sys. ControlConductivity MonitorControl Rod Pos. IndicatorsSAR Accident Safety FunctionInitiate scram (SAR 13.2.2) NoneNoneNone, but initiate fuel temperature scramNoneNone10 kW pulse interlock (SAR 13.2.3)NoneNoneNoneNoneDetermine pulse reactivity (via IRW, SAR 13.2.3)Description, ExistingHinged bar, simultaneously depresses four individual rod magnet / solenoid power switches to drop rodsRegulating rod is moved in response to difference between % demand potentiometer and percent of scale on multirange power channel (GA NMP-1000)Push button control to drive rods UP and DOWN, transient rod FIRENewport INFCT digital TC gauges with relay output to fuel temp scramNewport INFCT digital TC gauges with relay output to water temp alarmThermo RMS 2 detectors with remote analog readouts in control roomGA NLW-1000GA NMP-1000GA NPP-1000Pushbutton swith to energize cooling pump relaysFoxboro analytical analog conductivity gauge with alarm light indicators reading output from 10-turn potentiometers coupled to rod drivesDescription, ReplacementRed button, cuts current to all magnet / solenoid circuitsRegulating rod will be moved in response to the difference between % demand potentiometer and percent of scale on the TR 30 Log / Linear power range monitor.No changes in function or basic layout, although exact form of shim buttons needs to be determined.No changeNo changeThermo RMS 3 detectors with remote digital readouts in control roomNo changeThermo Orion 2100 series Ph and conductivity analyzer with digital indicatorNo changeAnalog Safety Functions Changed to Digital No No No No No No No No No No No NoAnalog Indicators Changed to DigitalNone No No No NoYesYesYesYes NoYes No50.59 Screening Questions - Answer "Yes" or "No"Decrease SSC design function reliability when failure would initiate an accident No No No No No No No No No No No NoDecrease SSC design function reliability when failure would mitigate accident No No No No No No No No No No No NoReduce redundancy, reliability or defense in depth No No No No No No No No No No No NoAdd or delete an automatic or manual design function of an SSC No No No No No No No No No No No NoConvert an automatic feature to manual or vice versa No No No No No No No No No No No NoAdversely affect ability to perform required actions No No No No No No No No No No No NoAdversely affect time response of required actions No No No No No No No No No No No NoDegrade seismic or environmental qualification No No No No No No No No No No No NoAffect method of evaluation used to establish design basis or safety analysis No No No No No No No No No No No NoIntroduce an unwanted or previously unreveiwed system or material interaction No No No No No No No No No No No No(Not described in SAR) indirect effects on electrical distribution No No No No No No No No No No No No(Not described in SAR) indirect effects structural integrity No No No No No No No No No No No No(Not described in SAR) indirect effects on environmental conditions No No No No No No No No No No No No(Not described in SAR) indirect effects on other SAR design functions No No No No No No No No No No No NoGA instruments replaced with equivalent Thermo instruments (NLW-1000 --> TR-30, NMP-1000 --> TR-10-5, NPP-1000 --> Thermo pulse power channel). The display will consist of a bar graph indicator and LED readout, plus an SV-180 digital strip chart recorder. All interlocks will be identical to extant system except log and multirange linear channels will feature redundant interlocks. The digital bar graph / LED indicators are digital, not analog, but similar systems are in use at Oregron State and UC-Irvine. Fission chamber, CIC, and UIC will be replaced with new units manufactured by Thermo.