0457 - G108 - Inspection Procedures - 07 - Industrial ... · industrial uses of RAM Comment G-108...
Transcript of 0457 - G108 - Inspection Procedures - 07 - Industrial ... · industrial uses of RAM Comment G-108...
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Industrial Radioactive Material
HRTDHuman ResourcesTraining & Development
U.S.NRCUNITED STATES NUCLEAR REGULATORY COMMISSION
Protecting People and the Environment
March 2011- Slide 1 of 100G-108 – Inspection Procedures
Industrial Radioactive Material(Nuclear Gauges)
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Gauge Presentation Outline
Overview
Portable Gauges
Fixed Gauges
March 2011- Slide 2 of 100G-108 – Inspection Procedures
Fixed Gauges
Other Industrial Devices
Regulatory Issues
Accidents
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For Irradiators, Industrial Radiography, and Well Logging, there are specific NRC technology courses which cover the equipment and radioactive sources used and the operations performed; however, there is no NRC sponsored technology course covering other industrial uses of RAM
Comment
March 2011- Slide 3 of 100G-108 – Inspection Procedures
industrial uses of RAM
As a result, this overview will provide somewhat more detail than that which is provided for the other areas covered in this inspection course
These slides were obtained from various sources and modified to correspond to current rules
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The 1950’s & 1960’s were an era of research for commercial uses of radionuclides resulting in the development of numerous industrial RAM applications [Atoms for Peace]
Overview
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Ionizing radiation is now an integral tool for a wide variety of industries; in many cases, there are no economical substitutes capable of the tasks performed by radiation sources
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The majority of industrial RAM applications use sealed sources, though unsealed RAM is also utilized
Most applications are based on very simple principles to accomplish the required task
Overview Sealed Source
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p q
Typically a source & detectorcombination employing basic nuclearinteractions is used
SealedSource
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Double EncapsulationSealed Source Assembly
Overview Sealed Source
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Most devices in this overview are recent models; however, older/obsolete models may be encountered during inspections & incident responses
Resources for identifying unknown RAM devices
Overview
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include:
NRC’s Sealed Source & Device Registry (SSDR)State & Federal radiation control agenciesManufacturersORAU
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This presentation will concentrate on Portable and Fixed Gauges which might be possessed under either a General or Specific license (GL or SL) - these devices have numerous applications in
Overview
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ppa wide variety of industries
Also discussed will be ionizers, calibrators, self luminous devices and other industrial applications involving radioactive material
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We will be looking at the FEs as they apply to the devices:
FE-1: Control of RAM (security & accountability)
FE-2: Adequate RAM shielding
Focus Elements(condensed version)
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FE-3: Limit hazards to RAM
FE-4: Appropriate dosimetry (if required)
FE-5: Proper radiation instrumentation
FE-6: Training of workers
FE-7: Appropriate management oversight & program/personnel audits
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Gauging Devices
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Fixed Gauge
Portable Gauge
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PORTABLE
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PORTABLE GAUGES
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Used in industries such as construction, civil engineering & agriculture to perform on-site measurements such as soil moisture or asphalt density in paving
Portable Gauges
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Moisture/density gauging is a form of non-destructive testing; eliminates need to take core samples
Two basic methods used:
Backscatter
Direct Transmission
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Portable Gauges
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Measures soil density by transmission and soil moisture by backscatter
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most precise method
to measure soil density, the source is placed beneath the surface through a punched
Direct Transmission
fixed distance
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hole - radiation travels a fixed distance to the detector on the base of the gauge
density of the soil measured by amount of radiation transmitted
sourcedetector
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eliminates punched access hole -both source and detector is on the surface
radiation reflected (scattered)
Backscatter
source
detector
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radiation reflected (scattered) back to the gauge by the material being measured
insensitive beyond a depth of a few inches
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Typical Sources : 8-10 millicuries of 137Cesium (gamma) & 40-50 millicuries of 241Americium/Beryllium (neutron)
In ~9 minutes an unshielded 10 mCi 137Cs source can
Portable Gauges
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In 9 minutes, an unshielded 10 mCi Cs source can deliver 5 rem to a worker's extremities at a 1 cm distance (some gauges contain sources with even higher activities)
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Common Portable Gauges
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TroxlerElectronic
Labs
HumboldtScientific
Corporation
CPN(now Instrotek)
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Portable Gauges
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Troxler Gauge Transport Case (DOT Type A 7A container)
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Portable Gauges
Nuclear hydrotectors provide moisture measurements of water content in the thermal insulation of pipes and vessels (moisture build-up in piping insulation is an indicator of corrosion under the
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is an indicator of corrosion under the insulation)
Also used to detect moisture in other locations such as under roofing material
Troxler “Roof Reader”
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FE-1: RAM Security & Accountability
What actions can inspectors take?
Become familiar with lost/stolen/orphaned source incidents (NRC INs, event reports, NMED database)
Recognize program weaknesses - study licensees’ facilities & interview workers
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facilities & interview workers
Portable gauge security at permanent facilities is not a significant problem
Portable gauge security at temporary job sites is more of a problem
Portable gauge security during transportation (particularly overnight stays) is a MAJOR problem
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Recent increased security measures for portable gauges include NRC’s 10 CFR 30.34(i) and compatible Agreement State requirements for two independent physical controls to prevent unauthorized access to gauges when not under constant surveillance.
FE-1: RAM Security & Accountability
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gauges when not under constant surveillance.
When opportunities present themselves (e.g., spot a gauge operator at a field site), perform partial inspection with particular focus on security issues
Emphasize importance of security & accountability during inspections; appeal to licensee by emphasizing costly civil penalties & homeland security
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FE-2: Adequate RAM Shielding
Potential for compromises to portable gauge shielding:
Shielding can be damaged if gauge is run over bya truck or heavy construction equipment
Shielding can be compromised by damage to the
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Shielding can be compromised by damage to the gauge during routine operations
Improper use and maintenance can damage shielding
Inspector actions:
Learn from past incidents, study program weaknesses, and look for trends… trends?
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FE-3: Limit Other Hazards to RAM
Moderate potential for other hazards
Portable gauges are not typically at risk from fire, explosion and corrosive chemicals like fixed gauges are.
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Inspector actions:
Discuss with the licensee the hazards identified during the inspection (portable gauge stored near a water heater, etc…)
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Portable gauge operators are typically monitored with whole body dosimetry, although it is not always required
Personnel monitoring is not a key performance
FE-4: Proper Dosimetry
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indicator, but can reveal trends
Inspector actions:
If personnel monitoring is required, evaluate use & records; look for any exposures that indicate poor work practices
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FE-5: Proper Radiation Instrumentation
Survey meters not typically possessed:
Note: licensees must have access to a meter
If meter(s) possessed review typical inspection items
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If meter(s) possessed, review typical inspection items such as calibration dates
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FE-6: Training Of Workers
Training for gauge operators is sometimes insufficient, either because initial training was poorly performed or not performed at all
Most portable gauge users attend a training course
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Most portable gauge users attend a training course provided by a specific gauge manufacturer
Refresher training not typically required for safety, but is required every three years for transportation (49 CFR 172 Subpart H)
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FE-7: Appropriate Management Oversight& Program/Personnel Audits
Management oversight & participation in radiation protection program (RPP) can vary widely among licensees, as can scope of program
Program audits are often inadequate; field audits are
March 2011- Slide 27 of 100G-108 – Inspection Procedures
Program audits are often inadequate; field audits arenot typically required for gauge users
It is incumbent upon management to ensure proper training, since gauge users have little to no oversight in the field
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Key Performance Indicators
Training
Usually the root cause of all other problems
Are operators aware of security requirements &
March 2011- Slide 28 of 100G-108 – Inspection Procedures
procedures, such as the portable gauge security requirement of 2 independent physical barriers to prevent unauthorized removal of gauge when not under constant surveillance?
If problems are identified with transportation in the field, ask about refresher HAZMAT training, required every 3 years
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Key Performance Indicators
Security & accountability
Stolen/lost gauges are common occurrences; lots of reasons they occur, but few easy solutions
A
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Are gaugesleft unattended?
Are securitymeasuresadequate?
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Transportation
Noncompliance is common; can lead to bigger problems
A t t d i th b k f th t k
Key Performance Indicators
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Are gauges transported in the back of the truck, out side of case, without blocking & bracing?
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Maintenance
Greatest potential for exposure
Does worker know how to perform maintenance ith t ?
Key Performance Indicators
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without unnecessary exposures?
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Gauge Maintenance
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Become familiar with the proper techniques for routine gauge maintenance so you know if it’s being done properly
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Inspection of Field Operations
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Direct observation of licensed activities providesthe best evaluation of a licensee’s performance
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Question:What’s wrong with this set up?
Inspection of Field Operations
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Answer:Transport case lacks DOT labels
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RSO and/or designee(s) should be able to demonstrate the proper technique for taking a leak test sample
Leak Testing
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137Cs
241Am
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Factors Contributing to Accidents
ACCIDENT
Use of theSurvey Meter
Equipment
Lack of Regulatory Control
Poor or No
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ACCIDENTEquipment Failure
Not FollowingSafety Procedures
Inadequate or MissingSafety Program
Poor or NoTraining
“Understand why accidents can occur when using nuclear gauges”
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Moisture/Density Road Gauge
Source: 137Cs & 241Am/Be Description: Gauge crushed by heavy equipment
Accidents Involvinga Portable Nuclear Gauge
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FIXED
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FIXED GAUGES
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What is a Fixed Nuclear Gauge?
Device used throughout industry, mostly in process control and quality control
Basically a source + detector: the amount of radiation that passes through or reflects off of the material
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that passes through or reflects off of the material supplies real-time data
Gauges used when rapid non-destructive measuring technique is needed
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Types of Fixed Nuclear Gauges
Nuclear gauges can be divided in two types:
TransmissionBackscattering
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There are also gauges that use x-rays instead of radioactive isotopes
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Fixed Gauge Components
Microprocessor
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Source &Source Holder Detector
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Shield
ShutterProcess Material
Primary Beam
Transmission Gauges
The source is placed on one side of the material to be examined and the detector is placed on the other side so that when the
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SourceDetector
Source Holder
other side so that when the shutter is open, the detector measures how much of the emitted radiation is actually transmitted through the material
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Backscatter Gauges
The detector is placed on the same side as the source, measuring the amount of radiation scattered back from the material to the detector
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Continuous Level Applications
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Single source,strip detector
Potato Bin
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Point Level Applications
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Dual sources & detectors
Coal Chute
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Other Fixed Gauge Applications
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Vapor density configurationMulti-source,strip detector
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Sample Fixed Gauges
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In-linedensity gauge
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Sample Fixed Gauges
March 2011- Slide 48 of 100G-108 – Inspection Procedures
Level gauge mounted on a process tank at a paper mill (not always perpendicular to the pipe)
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Design of gauges used at the power plant
Gauges containing a nominal 50 millicuries of Cs-137 are used to monitor coal chute flow
Detector
Front View
March 2011- Slide 49 of 100G-108 – Inspection Procedures
CesiumSourceHinge which
allows detector arm
to rotateoutward
Rad Warning sign not present at time of work
Work entailed welding to install
cleanout line
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Gauge Installedon Conveyor Belt
March 2011- Slide 50 of 100G-108 – Inspection Procedures
Could someone get between the radiation beam and the detector?
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MineralWeight
MineralLevel
Sample Process Control Gauges
March 2011- Slide 51 of 100G-108 – Inspection Procedures
Liquid
FlowMud Flow
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Sample Quality Control Gauges
FilmThickness
Beverage
March 2011- Slide 52 of 100G-108 – Inspection Procedures
Paper Thickness
BeverageLevel
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Fixed Gauges at Temporary Jobsites
March 2011- Slide 53 of 100G-108 – Inspection Procedures
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CementDensity
Fixed Gauges at Temporary Jobsites
March 2011- Slide 54 of 100G-108 – Inspection Procedures
yGauge
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Receipt, Transfer & Accountability
Cradle to Grave Accountability
March 2011- Slide 55 of 100G-108 – Inspection Procedures
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Security
March 2011- Slide 56 of 100G-108 – Inspection Procedures
locked to prevent unauthorized use and theftwarning signshieldedinventory record
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Repair & Maintenance
Fixed Gauges Routine Maintenance and Lubrication
March 2011- Slide 57 of 100G-108 – Inspection Procedures
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Leak Testing
Leak tests shall be performed at the frequency required by the manufacturer or license
Approved analysis methods
March 2011- Slide 58 of 100G-108 – Inspection Procedures
pp yand instruments shall be used
Procedures shall exist for removing the source from service if excess contamination is found
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Movement / Transportation
March 2011- Slide 59 of 100G-108 – Inspection Procedures
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Fixed gauges are subject to OSHA lock-out/tag-out standard specified in 29 CFR 1910.147
Lockout Procedures
March 2011- Slide 60 of 100G-108 – Inspection Procedures
Many licensees are unaware that their gauges are subject to the OSHA standard; address during inspection
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Limiting Public Dose
Who is the “Public”?
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Postings
March 2011- Slide 62 of 100G-108 – Inspection Procedures
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PERFORMANCE - To determine if licensed activities are being performed in a manner that protects the health & safety of workers, the public & the environment
Industrial RAMInspection Objectives
March 2011- Slide 63 of 100G-108 – Inspection Procedures
COMPLIANCE - To determine compliance with regulatory requirements & license conditions
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Industrial facilities present a multitude of potential hazards, & most are non-radiological (e.g., moving vehicles, machinery, unsafe scaffolding, spills, electrical hazards, chemicals, explosives, poor lighting, noise, vibration, extreme temperatures,
Generic Tips
March 2011- Slide 64 of 100G-108 – Inspection Procedures
confined spaces)
Be cognizant of basic OSHA regulations so that you can recognize when conditions are unsafe for others and YOU
If in doubt about conditions at a site, err on the margin of safety - never take unnecessary risks
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Most industrial facilities require completion of site-specific safety training & can require inspectors to provide their own safety gear… go prepared.
In addition to standard OSHA protective personal
Generic Tips
March 2011- Slide 65 of 100G-108 – Inspection Procedures
p pequipment, it may be necessary to use safety vests, harnesses, respirators or other specialized safety equipment to gain access to areas where industrial RAM is used; use of such equipment may require additional training (HF acid areas, elemental phosphorus areas, etc…)
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OSHA Gear
March 2011- Slide 66 of 100G-108 – Inspection Procedures
steel toe boots
hardhat
safetyglasses
ear plugs
Safety harness is required when on
ladders & scaffolding
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Interview as many users as possible; you will learn more from them than from the RSO
Observe the licensee using the device, performing licensed activities; if no work is being done, ask for
Generic Tips
March 2011- Slide 67 of 100G-108 – Inspection Procedures
demonstrations (leak tests, shutter checks, maintenance, surveys, etc..)
Users are typically not experts; sometimes they won’t understand a question, so rephrase it in plain language; don’t just assume they are untrained
Cross-check records against statements
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Fixed Gauge Inspections
Evaluate environmental conditions to determine what hazards (to the
March 2011- Slide 68 of 100G-108 – Inspection Procedures
Combine radiation measurements with inspection of the physical condition of gauge, labels, supports, etc.
(gauges) are present
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Environmental Damage
Harsh conditions can obscure warning labels, damage gauge housings and supports,
March 2011- Slide 69 of 100G-108 – Inspection Procedures
and compromise source shielding
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Key Performance IndicatorsFixed Gauges
Training - Root cause of most problemsExamples
Are operators aware of user limitations?Do operators know/follow lock-out procedures?Do they know how to respond to an
March 2011- Slide 70 of 100G-108 – Inspection Procedures
emergency?Are there unauthorized, un-informed workers removing and/or working on gauges?
Security & accountability - Especially post 9/11
Operating procedures - Lapses in following lock out procedure have resulted in worker exposures
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Emergency Intervention Requirements
Examples of potential accidents in nuclear gauging:
Melting of the gauge and source
Lost or stolen source
March 2011- Slide 71 of 100G-108 – Inspection Procedures
Physical damage to the gauge
Shutter stuck in the open or shut position
Transportation accident
Radiation overexposure of persons
Leaking source
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Source - 137Cs (111 GBq)
Source capsule was corroded by environmental conditions (sea air) which caused leakage.
Accidents Involvinga Nuclear Gauge
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Source - 85Kr (10 GBq)
Servicing of the gauge with the shutter open
Accidents Involvinga Nuclear Gauge
March 2011- Slide 73 of 100G-108 – Inspection Procedures
Source - 60Co (10 GBq)
Hot molten metal leaked out of process onto gauge and melted the shielding around the gauge
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Gauge use at power plant
Fixed nuclear gauges containing a nominal 50 millicuries of Cs-137 are used at the coal burning power plant to monitor coal flow through coal chutes.
March 2011- Slide 75 of 100G-108 – Inspection Procedures
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Overexposure to several members of the public
A group of 14 welders were working at the power plant in the immediate vicinity of the gauges.
6 ld i d t th 100 illi
March 2011- Slide 76 of 100G-108 – Inspection Procedures
6 welders received greater than 100 millirem exposure over a 10 day period.
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Design of gauges used at the power plant
Gauges containing a nominal 50 millicuries of Cs-137 are used to monitor coal chute flow
Detector
Front View
March 2011- Slide 77 of 100G-108 – Inspection Procedures
CesiumSourceHinge which
allows detector arm
to rotateoutward
Rad Warning sign not present at time of work
Work entailed welding to install
cleanout line
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Front view before cleanout installation with detector arm rotated 90º
Detector
Rotation
March 2011- Slide 78 of 100G-108 – Inspection Procedures
CesiumSource
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Side View showing orientation after rotation
March 2011- Slide 79 of 100G-108 – Inspection Procedures
CesiumSource
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Probable Doses
RSO initially estimated doses of exposed workers to range from 60 to 1700 millirem.
Aft f i ti ti t di d i t i i
March 2011- Slide 80 of 100G-108 – Inspection Procedures
After performing time motion studies and interviewing workers, the doses received by the welders were determined to be between 2 millirem and 650 millirem
The NRC’s estimates of radiation exposure were slightly lower than the licensee’s estimates.
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Response to Event
NRC Region IV dispatched a Special Inspection Team to the Laramie River Station to determine the causes of the event and to independently verify the probable radiation exposures to the welders. The Team also verified corrective actions taken and planned to prevent recurrence.
B th l i f th i ti th T id tifi d
March 2011- Slide 81 of 100G-108 – Inspection Procedures
By the conclusion of the inspection, the Team identified several apparent violations, including one that was not associated with the event. These violations included: 1) the failure to post warning signs where nuclear gauges were used, 2) overexposure of members of the public, 3) failure to report fire damage to a nuclear gauge, 4) failure to close the shutter of nuclear gauges prior to working around them, and 5) the failure to wear personnel monitoring devices when performing shutter checks on nuclear gauges.
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OTHER
March 2011- Slide 82 of 100G-108 – Inspection Procedures
INDUSTRIAL RAM USES
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Other Industrial RAM Uses
There are numerous applications of radioactive material in industry besides portable and fixed gauges such as ionizing devices, calibrators, self-luminous devices, diagnostic devices and R&D applications
March 2011- Slide 83 of 100G-108 – Inspection Procedures
applications
Let’s take a look at some
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Smoke detectors use a small Am-241 source to ionize air molecules passing between a pair of electrodes, permitting a small current to flow between the pair
Ionizers
March 2011- Slide 84 of 100G-108 – Inspection Procedures
current to flow between the pair
if smoke particles from a fire enter the space, they reduce the current flow by adhering to the ionized molecules; the drop in current sets off an alarm
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IonizersStatic Eliminators
Most consumer & commercial static eliminators use Po-210, though some commercial ones use Sr-90 -older models used Am-241 & Ra-226
March 2011- Slide 85 of 100G-108 – Inspection Procedures
Po-210static
eliminators
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Gas chromatography (GC) - a technique used to separate volatile organic compounds
Electron capture detector (ECD) used to analyze organic molecules such as PCBs & pesticides
IonizersECDs in GCs
March 2011- Slide 86 of 100G-108 – Inspection Procedures
Most ECDs use 15 mCi Ni-63 plated/foil sources; older models used H-3 sources (few remain in operation)
ECDs distributed as Generally Licensed (GL) or Specifically Licensed (SL) depending on source access
Common for licensees to have a mix of GL & SL ECDs; most new ones are GL
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IonizersECDs in GCs
March 2011- Slide 87 of 100G-108 – Inspection Procedures
analyzing samples for PCBs
ECD with 15 mCi 63Niplated foil source
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ECDs
Easy to see how they can be
March 2011- Slide 88 of 100G-108 – Inspection Procedures
ECD exchangeassembly
ECD label tags are important for maintaining control - ECDs often stored outside of GCs -tags may come off
y ymistaken for junk or spare parts
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ECDs
March 2011- Slide 89 of 100G-108 – Inspection Procedures
ECD GeneralLicense labels
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Self Luminous Devices
March 2011- Slide 90 of 100G-108 – Inspection Procedures
Tritium exit signs - even GL models contain multi-curies
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Custom grenadeCustom grenade
Custom Applications
March 2011- Slide 91 of 100G-108 – Inspection Procedures
Sr-90 source &detector array
fill level gaugefill level gauge
Grenade Fill Level Gauge
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Used to calibrate survey meters, alarming ratemeters, pocket dosimeters, etc.
Typically use 137Cs, though some models use 60Co or, for neutron calibrations 252Cf
Calibrators
March 2011- Slide 92 of 100G-108 – Inspection Procedures
for neutron calibrations, Cf
Calibrators may be GL (for mCi sources) or SL(mCi & Ci sources)
Used by instrument manufacturers, commercial calibration vendors and licensees performing calibrations in-house
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Survey Meter Calibrators
March 2011- Slide 93 of 100G-108 – Inspection Procedures
shielding to reduce mR/hr
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Green LightSh tt
Shutter Handle
Down Up
Survey Meter Calibrators
March 2011- Slide 94 of 100G-108 – Inspection Procedures
Shutter Closed(safe)
Red Light Shutter Open
(danger)
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Pocket Dosimeter “Calibrators”
March 2011- Slide 95 of 100G-108 – Inspection Procedures
12-Hole Pocket Dosimeter Calibrator (Generally Licensed)
6-Hole PD Calibrator (Exempt)
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XRF analyzers use one or more small (mCi) sources to irradiate samples - electrons, protons or x-rays emitted by the source eject inner bound orbital electrons leaving voids - as outer shell electrons fill the vacancies, the material fluoresces (emits characteristic x-rays) with specific
XRF (X-Ray Fluorescence) Analyzers
March 2011- Slide 96 of 100G-108 – Inspection Procedures
energies enablingID of the sample (source in XRF analyzer)
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Warrington lead paint analyzer
Common sources 55Fe, 57Co, 109Cd, 153Gd, 38Pu, 241Am & 252Cf
Beta emitters used are 3H & 147Pm
XRF Analyzers
March 2011- Slide 97 of 100G-108 – Inspection Procedures
Niton uses 30-50 mCi 109Cd, 55Fe or 241Am sources
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Co-60 (1 Ci) or Cs-137 (1.6 Ci) used to scan cargo containers for forhidden contraband
Gamma Scanners
March 2011- Slide 98 of 100G-108 – Inspection Procedures
Illegal immigrants detected inside truck
Used by U.S. Customs Service & FL Dept. of Agriculture
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New concern, post 9/11: RAM could be used as a “dirty bomb” - radiological dispersion device (RDD)
M i d t i l RAM
March 2011- Slide 99 of 100G-108 – Inspection Procedures
Many industrial RAM sources are considered ‘high risk’ for an RDD (e.g., industrial radiography, irradiator & high-activity fixed gauge sources)
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THE END
March 2011- Slide 100 of 100G-108 – Inspection Procedures
THE END