Team 1813: High Range Radiation Monitor Cable Study Team: Peter - - PowerPoint PPT Presentation

Team 1813: High Range Radiation Monitor Cable Study

Team: Peter Nidever(EE), Richard Ross(EE), Alex Cannan(ENGPHYS), Kelsey Bushkoff(ME), Charlotte Veitner(ME) Advisor: Yang Cao(ECE), Wilson Chiu(ME) Sponsor: Shane Williams (Zachry Nuclear)

Outline

• Background
• Previous Studies
• Project Statement
• Experiment Process
• Design Approach
• Project Milestones
• Budget

Background

• Temperature

changes during certain events causing misleading instrument readings

• Inconsistent readings

adds unnecessary confusion LOCA MSLB

• HRRM - High Range Radiation Monitor
• TIC - Thermally Induced Current
• LOCA - Loss of Coolant Accident
• MSLB - Main Steam Line Break

• EPRI - Electric Power Research Institute
• Dr. Cao
• Mostly involving heat transfer in 1D

Previous Studies

Wire Wire Centered in Conduit Wire in Contact with Conduit

Project Statement

Main Deliverables

• Design an experimental rig to

measure TICs for various coaxial cables-in-conduit configurations

• Transient 2D CFD model of one

cable-in-conduit configuration used in testing

• Suggestions for improving HRRM

systems to eliminate the problem

• f false alarms

Experimental Process

Time to Sink or Swim, Alex.

~Love Peter and Rick

Designing the Experimental Rig

Rig Design Approach

• We need a way to provide a relatively quick temperature gradient to the
• utside of a steel conduit, simulating a LOCA

○ Hot and cold liquid baths

• We will also need to measure the current, as well as temperature at certain

points along the cable, while keeping the conduit watertight

○ Drilled holes along conduit for thermocouples, epoxy to seal holes and ends

• With an ammeter and an interface for the thermocouples, we can route all of

this data into LabView for accurate data acquisition

Current Reading

• The TICs interfere with the keep-alive current running through the HRRM
• The keep-alive current is in the order of 10 pA
• Therefore, we require a picoammeter to accurately measure the TIC effects

Temperature Reading

• Thermistor - Low cost, good accuracy
• Thermocouple - Medium cost, great accuracy
• Resistance Temperature Detectors - High cost, best accuracy

Thermistor Thermocouple RTD

Sensor Design

Conduit Encapsulation

• To make the conduit watertight, we need to seal:

○ Conduit ends ○ Thermocouple holes

• We plan on using a two-step epoxy for the thermocouple holes
• We are exploring epoxy solutions for the conduit ends

Simulated Keep-Alive Circuit

Project Milestones

• Design and build experimental rig
• Create transient thermal 2D CFD model
• Compare the average surface temperatures of cable from experimental data

to CFD model

• Use thermal 2D CFD model to calculate TIC effect
• Compare modeled TIC effects to experimental data

Timeline

Budget

Budget Total of $1000.00

Item Product Number Quantity Price Description Thermocouples SA1XL-K-120 1 (Pack of 5) $131.00 5 Pack of self-adhesive thermocouples. 3 meter length. -73C to 315C temp range. Epoxy OB-100-16 1 (1 lb) $46.00 1 lb of two-step epoxy. Thermally conductive, water resistant. May be used to seal

• ff thermocouple holes as well possibly the conduit ends.

Conduit Electric Metallic Tube Conduit Testing Cables Instrumentation Wire for HRRM Trough Burners Free (Stealing them) From Chem, PHYS, or IMS lab

References

[1] S. Boggs and Y. Cao. High Range Radiation Monitor Cable Study: Phase I. 1998 [2] S. Boggs and Y. Cao. High Range Radiation Monitor Cable Study: Phase II 2000 [3] S. H. Weiss. Environmental Qualification Deficiency for Cables and Containment Penetration Pigtails 1997

Info About Personnel and Collaborators

Peter Nidever Undergraduate Electrical Engineering Peter.Nidever@uconn.edu Shane Williams Program Sponsor WilliamsSA1@zachrynuclear.com Alex Cannan Undergraduate Engineering Physics Alex.Cannan@uconn.edu Yang Cao EE Faculty Advisor Yang.Cao@uconn.edu Richard Ross Undergraduate Electrical Engineering Richard.Ross@uconn.edu Wilson Chiu ME Faculty Advisor Wilson.Chiu@uconn.edu Kelsey Bushkoff Undergraduate Mechanical Engineering Kelsey.Bushkoff@uconn.edu Charlotte Veitner Undergraduate Mechanical Engineering Charlotte.Veitner@uconn.edu University of Connecticut Storrs, CT 06269

Questions?