ML20154R304
| ML20154R304 | |
| Person / Time | |
|---|---|
| Site: | 07109192 |
| Issue date: | 03/19/1986 |
| From: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | |
| Shared Package | |
| ML20154R291 | List: |
| References | |
| NUDOCS 8603280304 | |
| Download: ML20154R304 (9) | |
Text
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'- ~ s Safety Evaluation Report 0 E' ANEFCO, Inc.
Model No. AP-300 Type A Docket No. 71-9192
SUMMARY
By application dated October 3,1985, as supplemented, ANEFCO, Inc.
requested design approval of the Model No. AP-300 Type A shipping package (cask) for low specific activity naterial (LSA) which will be transported by exclusive use vehicle.
Based on the statenents and representations contained in the application and the conditions listed below, we have concluded that the Model No.
AP-300 Type A cask neets the performance requirements of 10 CFR Part 71.
REFERENCES 9
- 1. ANEFC0 application dated October 3,1985.
- 2. Supplement dated October 25, 1985.
DRAWINGS The package is fabricated in accordance with ANEFCO, Inc. Drawing Nos.:
133-1, Rev. 8; 134-1, Rev. 7; 134-la , Rev.1; 135-1, Rev. 6; 136-1, Rev. 4; 138-1, Rev. 8; 139-1, Rev.1; 141-1, Rev.1; 142-1, Rev.1; 143-1, Rev. 2; 144-1, Rev.1; 145-1, Rev.1; 146-1, Rev.1; and 151-1, Rev. 1.
DESCRIPTION Steel encased, lead shielded shipping cask for low specific activity ma terial . The cask is right circular cylinder 83-5/8 inches in diameter ,
by 96.0 inches high. The cask cavity is 76.0 inches in diameter by 82 j inches high. The cask side walls consist of 1/2-inch thick inner steel shell, 2.06-inch thick lead shell, and a 1-1/4-inch thick outer steel shell. The base is similarly constructed of plate naterials. The stepped lid is comprised of a 1/2-inch thick inner steel plate, 2.06-inch thick lead layer, 3/8-inch thick steel plate, 3.8-inch thick concrete layer, and 2.0-inch thick outer steel lid plate. The lid is secured i with 36, 3/4-inch diameter hex socket bolts with washers and a Red Devil gasket. The lid is provided with a test port to verify the effectiveness of the lid seal following loading of the cask. The cask is provided with four lifting / tie-down lugs. The top of the cask is provided with a 3-inch diameter toroidal ring impact limiter and the bottom of the cask is equipped with a 2-1/2-inch square tubing impact limiter. The gross weight of the package is about 66,720 pounds.
8603280304 860319 .
PDR ADOCK 07109192 C pm
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e W 1 CONTENTS (1) Type and forn of material (i) Dewatered, solids, or solidified waste, neeting the requirements for low specific activity naterial, in secondary containers; or (ii) Activated solid conDonents neeting the requirements for low specific activity material, in secondary containers.
(2) Maxinun quantity of material per package Greater than Type A quantity of radioactive material which may contain fissile material provided the fissile material does not
! exceed the limits in 10 CFR 971.53. The decay heat load is limited
- to 1 watt.
- STRUCTURAL The applicant performed analysis to show that the ca'sk meets the performance requirements of 10 CFR Part 71 for a cask containing LSA material and transported by exclusive use vehicle. Following several submissions and 3
reviews, the package was -provided with a toroidal ring on the top and a square tubular ring on the bottom to absorb the impact energy resulting l from the one foot free drop.
A. General Standards for all Packaging
} Minimun Package Size
! The smallest external dimensions of the Model No. AP-300 Type A cask meets the requirement stipulated in 10 CFR 971.43(a).
Tamperproof Feature s
! The Model No. AP-300 Type A cask incorporates tamperproof feature
- in the form of lead wire seals located on the top of the lid.
Thus, it meets the requirement stipulated in 10 CFR 971.43(b). '
Positive Closure P The lid is secured by 36 hex socket head bolts 3/4-inch in diameter.
The seal test connection is also closed by hex socket bolts.
Therefore, inadvertent opening of- the closure has been precluded.
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~g Chenical and Galvanic Reaction The cask is designed and constructed of such materials that there will be no significant chemical, galvanic, or other reaction between packaging-components or between packaging components and the contents.
B. Lifting and Tie-Down 5tandards for all Packages Lifting Devices The cask lifting device consists of a hoisting beam, four wire rope slings, and a total of eight shackles. The same tie-down lugs are used for lifting the cask assenbly. The cask lid lifting device is provided by 4,1-1/4-inch diameter eye bolts which are inserted into 4 threaded holes in the lid. The eye bolts are 90' apart and must be removed during transport. It is also noted that the lid and the cask assembly will be always lifted vertically.
The applicant performed analysis for the above lifting system to show it meets the requirements of 10 CFR 671.45(a).
Tie-Down Devices
.The applicant has demonstrated by' analysis that the tie-down systen neets the requirements of 10 CFR 671.45(b).
C. Nornal Conditions of Transoort Heat The applicant performed an analysis based on an ambient tenpegature of 100*F, total insolation for a 12-hour period of 400 cal /cm and maximun cask internal heat load of 150 watts to show that there will be no reduction in the effectiveness of the packaging.
Cold The containment vessel is fabricated of ASTil A240 Type 304 stainless steel and is not susceptible to brittle fracture under the cold envi ronment. The stresses induced by differential thernal expansion between the lead shield and inner shell is small compared with the critical buckling stress. Thus, no reduction in the effectiveness of the packaging due to cold environment is expected.
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TN:r- Reduced External Pressure and Increased External pressure The applicant has shown by analyses that the packaging design neets the external pressure variation fron 3.5 psia to 20 psia as stipulated in 10 CFR 971.71(c) (3) and (4).
Vibrations The Model .No. AP-300 Type A cask is a welded cylindrical shell
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without any fragile attachnents. Since the calculated cask natural frequency .is well above the frequency range of ti.e truck, it is concluded that vibration normally . incident to truck transport will have no significant effects on the package.
Water Spray Water spray is judged to have no effect on the cask.
Free Drop The applicant has shown by analysis that the 11odel No. AP-300 Type A cask, including the permanently attached impact absorbing rings, can safely withstand the free drop requirenent of 10 CFR 971.71(c)(7) .
Corner Drop The flodel No. AP-300 Type A cask is welded steel construction.
Therefore, this regulatory requirenent is not applicable.
Compression The Model No. AP-300 Type A cask weighs in excess of 5,000 kg.
Therefore, no canpression load needs to be considered.
Penetration The Model No. AP-300 Type A cask has no valves, valve covers, or unprotected protrusions that are vulnerable to puncture. The impact energy resulting from a 13 pound,1-1/4 diameter rod dropping from a height of 40 inches will have no significant effect on the cask.
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THERMAL The Model No. AP-300 Type A cask is a steel encased, lead chielded cask,
- designed to neet the requirements for LSA packages. The applicant has demonstrated by analysis that there are no significant problems with naterial properties or themal stresses under the required nomal conditions of transport. The naximun internal heat source considered was 150 watts.
CONTAINMENT The applicant proposes to leak test the containeg prior to first use using a test with sensitivity equivalent to I cm air (STP) per. hour.
An angual leakage ter,t 13 proposed wnich limits allowable leakage to 10 cn /hr (2.8 x 10 " cm /s). These leakage tests are adequate for a package containing LSA raterials in greater than Type A quantities.
COMBUSTIBLE GAS MIXTURES (a) Conditions have been imposed for packages containing water and/or organic substances to limit the accumulation of radiolytically generated gases over the shipping period to preclude the possibility of significantly reducing the packaging effectiveness due to explosion.
The conditions require a representative package be prepared as for shipnent, and a determination by tests and neasurements be made to show that the limiting conditions are net over a time period of twice the expected shipping period. The contents are held in a secondary container prior to and during shipnent. Tests and neasurements are to be perfomed on secondary containers as they will be representative of the packages for this purpos a.
The limiting conditions proposed are:
"(i) The hydrogen generated must be limited to a nolar quantity that would be no nore than 5% by volune (or equivalent linits for other inflammable gases) of the secondary container gas void if present at STP (i.e., no more than 0.063 g-noles/f t 3 at 14.7 psia and 70'F); or (ii) The secondary container and cask cavity must be inerted with a diluent to assure that oxygen must be limited to 5% by volume in those portions of the package which could have hydrogen greater than 5%."
Furthermore, shipments rust be completed within a tine period equal to the test period (i.e., twice the expected shipping period), and shipnent time begins when the package is sealed.
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t-Conditien (i) limits the quantity of hydrogen to 0.063 g-noles/ft3 ,
but does not require any inerting of the container (air environment is asst.ned). This mixture, if ign'ted, could result in a combustion reaction, but it has been shown that such a reaction would yield a pressure rise of about 2.3 psig. The limit may be satisfied by shipments exhibiting sufficiently low rates of radiolytic gas generation, or by the use of a recombiner device which could catalytically recombine the hydrogen / oxygen to produce water and maintain a steady state hydrogen concentration below 5%.
Condition (ii) requires inerting the secondary container and cask cavity with a diluent gas (e.g., nitrogen) to limit the maximum oxygen concentration to 5% in any portion of the package where -
hydrogen may exceed 5% by volume. It is shown that a mixture limited to 5% oxygen in any combination of hydrogen and nitrogen will not support combustion.
(b) Based on infomation contained in a draft report (NUREG/CR-3829, May 1984) and data from a number of other reports (BNL-NUREG-50617, BNL-NUREG-28682, NUREG/CR-2830, and NU9EG/CR-2969), the staff has evaluated the question of hydrogen generation for low specific activity (LSA) naterial in various waste foms.
As a result of our review, we have concluded that there is uncertainty in data available for predicting hydrogen generation for the various waste foms used. It has also been detemined that waste neeting the requirements of LSA material could generate combustible quantities of hydrogen within a sho'rt period of time (i.e., as quickly as 100 days) depending on the radionuclide and activity of the naterial.
Because of the uncertainty with regard to waste fom and the relatively short time needed to generate combustible mixtures for some loadings, all waste foms will be considered the same when shipped as LSA mateiral and all must be shipped within 10 days after the preparation.
and closure or within 10 days af ter venting. This time restriction l pemits shipment times of up to 90 days without exceeding the 100 day ~ period which is a conservative minimum time for generation of a
[; combustible mixture under worst conditions.
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W SHIELDING The Model No. AP-300 Type A cask has a bottom and radial 2-inch Pb shield sandwiched by an inner 0.5-inch thick steel and an outer 1.25-
' inch thick steel annular shell. The top shield is concrete supported by steel plates resting on 2 inches Pb between steel plates. The contents of the cask are an eauivalent of 20 curie source of Co-60 (less than 1
, thermal watt heat load) homogeneously distributed in the cask cavity
- (outer radius of 37.5 inches, height of 80 inches), the applicant has assumed the above curie content is residing in water. The applicant ,
used standard Rockwell Shielding (T10-7004) calculation formalism for a cylindrical distributed source. The staff reviewed and duplicated these calculations in detail thus verifying the applicant's assumptions, basic shielding parameters, materials, dimensions, and mathematical modeling.
The cask gamma surface dose rates for normal conditions were calculated ,
to be approximately 9 mren/hr; at 3 feet from cask surface it was 3 mren/hr using a 1/R flux variation.
The applicant has demonstrated analytically that the surface dose rate for the accident lead-slump of 0.74 inches would not change the gamma dose rate at 3 feet from cask surface.
CRITICALITY The fissile material has been limited in accordance with the exenpt limits contained in 10 CFR $71.53 OPERATING, ACCEPTANCE, AND MAINTENANCE General operating procedures for use of the package are provided in Section 7 of the application.
! The acceptance tests and maintenance program are described in Section 8 l of the application. The Acceptance Tests (Section 8.1) describes visual inspections, component tests, pressure tests, leak tests, and tests for
. shielding integrity. The Maintenance Progran (Section 8.2) describes ,
l~ lid gasket inspection and replacement, conoonent inspection, and pressure i and leak tests. Each of the above include its respective acceptance criteria.
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Yp-CONDITIONS
- 1. (a) For any package containing water and/or organic substances which could radiolytically generate combustible gases, determination must be made by tests and measurements or by analysis of a representative package such that the following criteria are j net over a period of time that is twice the expected shipment i time:
(1) The hydrogen generated rust be limited to 3 molar quantity that would be no more than 5% by volume (or equivalent limits for other inflammable gases) of the secondary container gas vojd if present at STP (i.e., no more than 0.063 g-noles/ft at 14.7 psia and 70*F); or (ii) The secondary container and cask cavity must be inerted with a diluent to assure that oxygen rust be limited to 5% by volume in those portions of the package which could have hydrogen greater than 5%.
For any package delivered to a carrier for transport, the secondary container rust be prepared for shipnent in the same manner in which detemination for gas generation is made.
Shipment period begins when the package is prepared (sealed) and rust be completed within twice the expected shipment time.
(b) For any package shipped within 10 days of preparation, or within 10 days after venting of drums or other secondary containers, the determination in (a) above need not be made, and the time restriction in (a) above does not apply.
i 2. Maxinum gross weight of the contents, secondary containers, and shoring is limited to 20,000 pounds.
- 3. Except for close fitting contents, shoring rust be placed between secondary containers and the cask cavity to ninimize novenent during nonnal conditions of transport.
- 4. The lid lifting eye bolts rust not be used for lifting the cask, and must be removed and the holes covered in transit.
- 5. The cask cover must be secured by 36, ASTM A-320. Type L7A, 3/4-10 UNC-3A x 3-l/4 hex socket head bolt with 1-3/8 OD x 13/16 ID x 1/2 thick flat steel (L7A) washers torqued to 110 f t-lbs (lubricated).
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- 6. In addition to the requirements of Subpart G of 10 CFR Part 71:
(i) Prior to each shipnent, the packaging Red Devil lid seal nust be inspected. The seal must be replaced with a new seal if inspection shows any defects or every 12 months, whichever occurs first. Red Devil lid test port gaskets must be replaced following each use.
(ii) The cask nust neet the Acceptance Tests and Maintenance Progran of Section 8.0 of the application. The cask botton inpact limiter must be inspected prior to each shipment in accordance
- with Section 8.2.1.1 of the application.
- 7. The cask body and cask lid nust be narked in accordance with 10 CFR 971.85(c).
- 8. .The package authorized by this certificate nust be transported on a motor vehicle, railroad car, aircraf t, inland watercraf t, or hold or deck of a seagoing vessel assigned for the sole use of the licensee.
[,r Charles E. MacDonald, Chief p Transportation Certification Branch Division of Fuel Cycle and Material Safety, NMSS Date: EARI9IENI t
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