ML24011A018
| ML24011A018 | |
| Person / Time | |
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| Issue date: | 01/11/2024 |
| From: | Office of Public Affairs |
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| Download: ML24011A018 (1) | |
Text
Reactor Concepts Manual Transportation of Radioactive Material Transportation of Radioactive Material
Hazardous
Santa Fe
The issues associated with the transportation of radioactive material are very complex due in part to the regulatory requirements of both the NRC and the Department of Transportation (DOT). As a result, this will be a very brief overview of the relevant issues.
USNRC Technical Training Center 11-1 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
UN Classification
Class 1 Explosives Class 2 Gases Class 3 Flammable Liquids Class 4 Flammable Solids Class 5 Oxidizers and Organic Peroxides Class 6 Poisonous and Etiological Materials Class 7 Radioactive Materials Class 8 Corrosives Class 9 Miscellaneous Hazardous Materials
All hazardous materials which could potentially be transported are assigned to one of the nine United Nations Classes. In general, the hazardous materials listed pose an immediate threat to health and safety.
However, for radioactive material, the threat is potentially the non-immediate risk of cancer, although in large enough quantities, radiation can pose an immediate threat.
USNRC Technical Training Center 11-2 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Groups Promulgating Rules Governing Transport of Radioactive Materials
Department of Transportation Nuclear Regulatory Commission Department of Energy Postal Services State Agencies
Regulations to control the transport of radioactive materials were initiated about 1935 by the Postal Service. Over the years, the Interstate Commerce Commission (ICC) became involved. Currently, there are at least five groups which promulgate rules govern ing the transport of radioactive material. These are the DOT, NRC, Postal Service, DOE, and the States.
Of these agencies, the DOT and NRC are the primar y ones issuing regulations based upon the standards developed by the International Atomic Energy Agency (IAEA).
USNRC Technical Training Center 11-3 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
T OF TRANSP EN OR N U C LE AR R EG U L ATO R Y TM TA R TI CO PA O AT ES ED N
U N I T E D STAT E S O F A ME RI CA
The NRC and DOT share responsibility for the control of radioactive material transport based upon a Memorandum of Understanding (MOU).
In general, DOT regulations (49 CFR) are more detailed. They cover all aspects of transportation, including packaging, shipper and carrier responsibilitie s, documentation, and all levels of radioactive material from exempt quantities to very high levels.
The NRC regulations (10 CFR 71) are primarily concerned with special packaging requirements for higher level quantities. NRC regulation 10 CFR 71.5 requires NRC licensees transporting radioactive material to comply with DOT regulations when NRC regulations do not apply.
USNRC Technical Training Center 11-4 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
For transportation purposes, radioactive material is defined as any material which has a specific activity greater than 0.002 microcuries per gram. This definition does not specify a quantity, only a concentration. As an example, pure cobalt-60 has a specific activity of 1,000 curies per gram, which is about 500 billion times greater than the definition. However, uranium-238 has a specific activity of only 0.3 microcuries per gram, which is only 150 times greater than the definition.
Although both exceed the definition of radioactive materi al in their pure form, either of these materials could be uniformly mixed with enough substance, such as dirt, which would cause the concentration to fall below the definition. In the case of uranium-238, if one gram were mixed with about 150 grams of dirt (about 1/3 of a pound), the concentration could be classified as non-radioactive.
Remember, however, that the definition of radioactive material above only applies for transportation.
USNRC Technical Training Center 11-5 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Since transport accidents cannot be prevented, the regulations are primarily designed to:
- Insure safety in routine handling situations for minimally hazardous material and
- Insure integrity under all circumstances for highly dangerous materials.
These goals are accomplished by focusing on the package and its ability to:
- Contain the material (prevent leaks),
- Prevent unusual occurrences (such as criticality), and
- Reduce external radiation to safe levels (provide shielding).
USNRC Technical Training Center 11-6 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Packages
Strong Tight Container Type A Packages Type B Packages
The three basic types of packages are strong tight containers, whose characteristics are not specified by regulation, followed by Type A containers, and fina lly Type B containers, both of which have very specific requirements in the regulations.
A strong tight container is designed to survive normal transportation handling. In essence, if the material makes it from point X to point Y without being re leased, the package was a strong tight container.
A Type A container, on the other hand, is designed to survive normal transportation handling and minor accidents.
Type B containers must be able to survive severe accidents.
Fissile materials, which could be involved in a criticality accident, also have additional requirements.
USNRC Technical Training Center 11-7 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Type A
FIBERBOARD BOX W OODEN BOX STEEL DRUM
Type A packaging is based on performance requirements which means it must withstand or survive certain tests. The shape of the p ackage or material from which it is constructed is irrelevant. A Type A package may be a cardboard box, a wooden crate, or a metal drum. The shipper must have documentation which shows that the specific design being used has passed the required tests.
USNRC Technical Training Center 11-8 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Type B
INNER CONTAINMENT VESSEL STEEL OUTER DRUM SHIELDED INNER CONTAINER THE R MA L I N S U L A TIO N BETW EEN CONTAINERS
A Type B package may be a metal drum or a huge, massi ve shielded transport container. Like Type A packages, Type B packages must pass certain tests. However, the Type B tests are considerably more rigorous than those required for Type A packages. Most Type B packages have been issued a Certificate of Compliance by the NRC.
USNRC Technical Training Center 11-9 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
High I nte gr ity Massive Encapsulation Solid M etal as a Sealed Source Special High Integrity Welds Form Tantalum Inner Stainles s Steel Capsule Outer Capsule Radiois otope
High Integrity Welds
Waste Material in Liquid in Bo ttle Within Plastic Bag Metal C onta iner Nor mal Form
Powder in Glass Gas in Cylinder or Plastic Bottle
The system created to ensure safe transport of radioactive materials is based on the assignment of a number to each radionuclide, depending upon its form (i.e., its relative hazard if released from the package during transport). The number, or A value, represents the limit, in curies, permitted to be transported in a Type A package. There are two distinct categories established for this system.
Special form (A1) radionuclides are usually encapsulated sources which would only pose an external radiation hazard, not a contamination hazard, if the package was ruptured.
Normal form (A 2) radionuclides are usually not securely encapsulated and could yield significant contamination if the package was ruptured. These materials could pose an internal hazard to people at the scene of an accident. Normal form materials are typically liquids and powders.
Since the A values provide the lim it for the amount in a package, A2 values cannot be greater than A 1 values, since A2 values represent material in normal form, which makes it more hazardous. However, for some nuclides, the hazard may be the same in either form so that A1 can be equal to A2. In any case, neither A1 nor A2 can be greater than 1000 curies.
USNRC Technical Training Center 11-10 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Sample A Values (curies)
Special Form Normal Form Ratio Material A1 Values A2 Values A1/A2 Plutonium-239 2 0.002 1,000 Strontium-90 10 0.4 25 Cobalt-60 7 7 1
When A1 equals A2, the hazard is considered the same, whether the material is in normal or special form.
This tends to be the case for gamma emitters. For alpha emitters, the normal form (unencapsulated) is considered to be 1,000 times more hazardous as the special form (sealed), so that the A 1 values are about 1,000 times lower. Beta emitters fall between the two.
USNRC Technical Training Center 11-11 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material Quantity of Radioactive Material will determine Classification
Non-Radioactive Limited Type A Type B Highway Route Controlled
The manner in which radioactive material is handl ed for transport depends upon the amount of material and its relative hazard:
Non-Radioactive - If the amount of material is less than 0.002 microcuries per gram, it is not considered radioactive for transportation purposes
Limited Quantity - If the amount is greater than 0.002 microcuries per gram but does not exceed one thousandth of the A1 or A2 value (depending on the form), then the material is considered a limited quantity and needs only a strong tight container, which should survive routine handling.
Type A Quantity - If the amount is less than or equal to the A 1 or A2 value (depending on the form) but greater than one thousandth of the value, then the material requires a Type A package, which should survive minor accidents.
Type B Quantity - If the amount is greater than the A 1 or A2 value (depending on the form) but less than or equal to 3000 times these values, then the material requires a Type B package, which should survive a serious accident.
Highway Route - If the amount is greater than 3000 times the A1 or A2 value (depending on Controlled the form) but less than 27,000 curies, then the material is a highway route Quantity controlled quantity, which requires a Type B package, and the carrier must have special training. State officials must be notified if the material is radioactive waste.
USNRC Technical Training Center 11-12 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
UNITE D ST A TE S PO STAL SERVICER
The postal service has slightly different limits. They will only accept packages containing limited quantities, i.e., with amounts small enough such that th ey require only a strong tight package. Quantities requiring Type A and Type B packages are not acceptable to the postal service. To provide an additional safety margin, the postal service defines limited qua ntities differently from DOT. The USPS limits are lower, exactly one tenth of the DOT limits. In addition, the postal serv ice has separate limits for liquids and gases.
USNRC Technical Training Center 11-13 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Low Specific Activity Material
A special classification, low specific activity, is give n to any radioactive material which is uniformly dispersed throughout a substance to such an extent that it poses little hazard even if released in an accident. To be classified as low specific activ ity, the concentration must be greater than 0.002 microcuries per gram (otherwise it would not be radioactive) but less than specified concentration limits, which are based on the A values.
Although the concentrations permitted are low (300 mi crocuries per gram or less), the total amount of material may be quite high, depending upon how much total mass there is. Therefore, although the definition of low specific activity considers only the concentration, not the total quantity, the type of package required for the low specific activity material (either strong tight container or Type A) will depend upon the total quantity of activity (curies) rather than the concentration (microcuries/gram).
USNRC Technical Training Center 11-14 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Markings
Markings are designed to provide an explanation of the contents of a package by using standard terms and codes.
USNRC Technical Training Center 11-15 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Labeling
RADIOACTIVE I RADIOACTIVE II RADIOACTIVE III CONTENTS __________ CONTENTS __________ CONTENTS __________
ACTIVITY __________ ACTIVITY __________ ACTIVITY __________
TRANSPORT INDEX TRANSPORT INDEX
Labels are used to visually indicate the type of hazard and the level of hazard contained in a package.
Labels rely principally on symbols to indicate the hazard.
Although the package required for transporting radioac tive material is based on the activity INSIDE the package, the label required on the package is based on the radiation hazard OUTSIDE the package.
Radioactive material is the only hazardous material which has three possible labels, depending on the relative radiation levels external to the package. Also, labels for radioactive material are the only ones which require the shipper to write some informati on on the label. The information is a number called the Transport Index (TI), which, in reality, is the hi ghest radiation level at 1 meter from the surface of the package.
The three labels are commonly called, White 1, Yellow 2, and Yellow 3, referring to the color of the label and the roman numeral prominently displayed. A specific label is require d if the surface radiation limit and the limit at 1 meter satisfy the following requirements:
Label Surface Radiation Level Radiation Level at 1 Meter
White 1 Does not exceed 0.5 millirem/hour Not applicable Yellow 2 Does not exceed 50 millirems/hour AND Does not exceed 1 millirem/hour Yellow 3 Exceeds 50 millirems/hour OR Exceeds 1 millirem/hour
Since the TI is the radiation level at 1 meter, it is clear that a White 1 labe l has no TI. A Yellow 2 must have a TI no greater than 1, and a Yellow 3 may have a TI greater than 1.
Referring to the radiation limits on page 11-19 for ve hicles, it can be seen that the maximum TI for nonexclusive use vehicles (common carriers) and for exclusive use (contract carriers) open vehicles is
- 10. The radiation level at 1 meter from the surf ace of a package can exceed 10 mrem/hour only if the package is transported in an exclusive use (contract carrier), closed vehicle.
USNRC Technical Training Center 11-16 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Placarding
Rear PLACARDS (1) Front Of TrailerSideSide (2) (3) Or Trac tor (4)
VANS Placarding
On Front Of PLACARDS Trac tor Or Trailer Each Side Of Trailer Back (1) (2) & (3 ) Of
Trailer (4)
FL AT Placarding
LABELS Placed On Each Opposite Side Or E nd Of Each Container
Placards are just bigger labels which are placed on the out side of the vehicle. Unlike labels, there is only one placard and no information needs to be written on it (i.e., no TI). In fact, a placard on a vehicle is only required if the vehicle is carrying a package bearing a Yellow 3 label or low specific activity material. If the amount of material being trans ported constitutes a highway route controlled quantity, the diamond-shaped placard has a black square border surrounding it.
USNRC Technical Training Center 11-17 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Carriers:
Common Contract Private
There are essentially three classes of carriers:
- Common,
- Contract, and
- Private.
Common and contract carriers provide a service to others. They carry other peoples materials.
Common carriers have published rates for hauling mate rial, while contract carriers negotiate a specific contract with the shipper. Common and contr act carriers are not licensed by the NRC. The responsibility for safety rests with the shipper.
Private carriers own the radioactive material which they carry. The transport of material is accomplished in direct support of the radioactive material users business. These carriers are licensed by the NRC.
Some examples of private carriers who transport their sources from one job site to another are:
- Industrial radiographers,
- Portable gauge users, and
- Well loggers.
In addition to the above, radiopharmacies deliver their own radiopharmaceuticals to nuclear medicine clinics.
USNRC Technical Training Center 11-18 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Radiation Limits
Type of Transport Maximum Radiation Limit
Common carrier non-exclusive use:
Open or closed 200 millirems/hour on the surface of the package and 10 transport millirems/hour at 1 meter from any surface of the package
Contract carrier exclusive use:
Closed transport 1000 millirems/hour on the surface of the package, 200 millirems/hour at the surface of the vehicle, 10 millirems/hour at 2 meters from any surface of the vehicle, and 2 millirems/hour in the vehicle cab
Open transport 200 millirems/hour on the surface of the package, 200 millirems/hour on any imaginary surface of the vehicle, 10 millirems/hour at 2 meters from any imaginary surface of the vehicle, and 2 millirems/hour in the cab of the vehicle
For non-exclusive use vehicles, that is, vehicles which may be carrying other non-radioactive material as well (common carriers), the radiation limit is imposed on the package.
For exclusive use vehicles, that is, the vehicle is only carrying radioactive material for one shipper (contract or private carrier), the package limits are hi gher, but there are also lim its on the outside of the vehicle.
USNRC Technical Training Center 11-19 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Shipping Papers
SHIPPER'S CERTIFICATION FOR RADIOACTIVE MATERIALS Two completed and signed copies of this certification sh all be handed to the carrier.
(Use block letters)
W ARNING: Failure to co mply in all respects with the ap plicable regulations of the Department of Transportation, 49-CFR, CAB 82 and, for international shipments, the IATA Restricted Articles Regulations may b e a breach o f th e ap plicable law, sub j ect to legal pen alities. Th is c ertificatio n sh all in n o circ um stan ces b e signed by an IATA Cargo Agent or a consolidator for international shipments.
This shipment is within the limitations presc ribed for (mark on e)
X passanger aircraft cargo-only aircraft
NATURE AND QUANT ITY OF CONT ENT PACKAGE PROPER RADIONUCUDE GROUP FORM ACTIVITY CATEGORY TYPETRANSPORT SHIPPING NAME INDEX FOR US NAME OR CHEMICAL FORM I-W H IT E FOR INDUSTRIAL SHIPMENTS SYMBOL GROUP AND PHYSICAL NUMBER NUMBE R OR YELOW OR OF PRINCIPAL NUMBER STATE: GAS OF CURIES OF II-YELLOW LABEL TYPE A SEE SECTION 2 RADIOACTIVE OF GROUPS or SPECIAL FORMLIQUID, SOLID OR OR CATEGORIES OR CAB 82 CONTENT I TO VII or SPECIAL MILLICURIES PACKAGES III-YELLOW ONLY TYPE B TABLE 6-0 ENCAPSULATION LABEL
ADDITIONAL INFORMATION REQUIRED FOR FISSILE MATERIALS ONLY EXEMPTED FROM THE ADDITIONAL REQUIREMENTS FOR FISSILE MATERIALS SPECIFIED IN / 1 OF PART 2 OF THE IATA RESTRICTED ARTICLES REGULATIONS NAMES PLUS QUANTITY IN GRAMS OR CONCENTRATION OR ENRICHMENT IN U235 NOT EXEMPTED FISSILE CLASS I FISSILE CLASS II FISSILE CLASS III Additional certificates obtained by the Shipper when necessary N/A Special Form Encapsulation Certificate(s) Certificate(s) for Large Radioactive Source Type B Packaging Certificate(s) Government Approvals / Permits Certificates for Fissile Material
Special Handling Information NO NE I hereby certify that the contents of this consignment are fully and accurately described above by Proper Shipping Name and are classified, packed, marked, labeled and in proper condition for carriage by air according to applicable national governmental regulations, and for international shipments. The current IATA Restricted Articles Regulations.
Name and full address of Shipper Nam e an d title o f person sig nin g Certif ic ation
Date: Signature of the Shi pper (see W ARNING abov e)
Air Waybill No: Airport of Departure: Airport of Destination
The only way for anyone to know what is being transported inside a ve hicle is by reviewing the shipping papers. These documents, by words and codes, clearly specify what is being transported. They must be readily accessible to the driver and to emergency response personnel, if the driver is not available.
USNRC Technical Training Center 11-20 Rev 0703 Reactor Concepts Manual Transportation of Radioactive Material
Accidents
CTIVE
RADIOA
Many packages containing radioactive materials have been involved in transport accidents. The statistics verify the degree of protection expected of each class of packaging.
For strong tight containers, which do not have to pass any integrity tests, about 10% of those involved in accidents have failed. Of those, about 90% have released their contents.
For Type A packages, which must pass stringent te sts, only 1% of those involved in accidents have failed. Of those, only 39% have released their contents.
For Type B packages, which must pass the most rigor ous tests, several have been involved in accidents.
However, there has been only one documented case of a package failure, and that involved an industrial radiography source.
USNRC Technical Training Center 11-21 Rev 0703