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
Component Manual Scram Switch Automatic Flux Control System Rod Control Fuel TC Gauges Water TC Gauges Area Rad Monitors Log Channel Linear Channel Percent Power / Pulse Channel Cooling Sys.
Control Conductivity Monitor Control Rod Pos.
Indicators SAR Accident Safety Function Initiate scram (SAR 13.2.2)
None None None, but initiate fuel temperature scram None None 10 kW pulse interlock (SAR 13.2.3)
None None None None Determine pulse reactivity (via IRW, SAR 13.2.3)
Description, Existing Hinged bar, simultaneously depresses four individual rod magnet / solenoid power switches to drop rods Regulating 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 FIRE Newport INFCT digital TC gauges with relay output to fuel temp scram Newport INFCT digital TC gauges with relay output to water temp alarm Thermo RMS 2 detectors with remote analog readouts in control room GA NLW-1000 GA NMP-1000 GA NPP-1000 Pushbutton swith to energize cooling pump relays Foxboro analytical analog conductivity gauge with alarm light indicators reading output from 10-turn potentiometers coupled to rod drives Description, Replacement Red button, cuts current to all magnet / solenoid circuits Regulating 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 change No change Thermo RMS 3 detectors with remote digital readouts in control room No change Thermo Orion 2100 series Ph and conductivity analyzer with digital indicator No change Analog Safety Functions Changed to Digital No No No No No No No No No No No No Analog Indicators Changed to Digital None No No No No Yes Yes Yes Yes No Yes No 50.59 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 No Decrease SSC design function reliability when failure would mitigate accident No No No No No No No No No No No No Reduce redundancy, reliability or defense in depth No No No No No No No No No No No No Add or delete an automatic or manual design function of an SSC No No No No No No No No No No No No Convert an automatic feature to manual or vice versa No No No No No No No No No No No No Adversely affect ability to perform required actions No No No No No No No No No No No No Adversely affect time response of required actions No No No No No No No No No No No No Degrade seismic or environmental qualification No No No No No No No No No No No No Affect method of evaluation used to establish design basis or safety analysis No No No No No No No No No No No No Introduce 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 No GA 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.