ML20246N305

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Forwards Addl Info Requested on 881205 Re Amend to Model 850 Under Certificate of Compliance 9147
ML20246N305
Person / Time
Site: 07109147
Issue date: 03/10/1989
From: Roughan C
AMERSHAM CORP.
To: Macdonald C
NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
25323, NUDOCS 8903270343
Download: ML20246N305 (8)
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{{#Wiki_filter:RETURN.TO 36$!d3-R 7/-9/47 ~ ~ 'Arnarsham Corporation .o cd 4'O North Avenue [ en N Burlington, Massachusetts 018 DOCKETED \\ ' Telephone (617) 272-2000 ll3NRC 4 [ MAR 201989 y. q tmss ~ March 10, 1989 M4rt sEcnon t- $gd$9/Sgg l~j j d;j 00CKE7 CLEAX j 9 m Mr. Charles MacDonald, Chief b ~" Transportation Branch Division of Safeguards and Transportation M Nuclear Material Safety and Safeguards j U.S. Nuclear Regulatory Commission Washington, DC 20553

Dear Mr. MacDonald:

d I am supplying the additional information you requested on 5 i December 1988 concerning our amendment to the Model 850 Package i NRC,-COC number 9147.- In your letter you raised four structural concerns over our proposed modification to the package. I have answered these concerns in the same order below. 1 The discrepancy noted between the drawings and section 2.1.1 l of the safety analysis report has been corrected. I have i enclosed revised pages to reflect this. We have subjected the modified 850 to two 30 foot drop tests, as a result there was no loss of structural integrity as a result of the welds. We feel l that based on this satisfactory performance the 1/8" fellet weld will hold up under accident conditions of transport. If the complete weld were to fail and the additional shielding plate l fell off, the radiation levels would not be increased significantly. They would be well below 1 R/hr at one meter which is the criteria for successful completion of the drop test. Radiation profiles conducted on an unmodified 850 show that the highest radiation level would be less than 400 mR/hr. I 2. A compression test was performed on the modified 850 with no impairment of structural integrity or loss of shielding efficiency. The safety analysis report section 2.6.9 has been revised to reflect this. 3. The orientations were chosen to try and impact the top of the 850 (lockbox) and the bottom corner. As it is very difficult to control actual point of impact during a 30 foot drop the areas impacted were the top corner and a bottom corner as previously submitted (March 1988). I have enclosed actual photographs showing the two areas of impact after drop tests and the damage that was incurred. b[I m-' m _,JL 2,,2, Amerstlam exame43 e,,g {DR ADOCK 07109147 4 P_D.C_

4. We conducted a puncture test so that the area impacted was the cover over the lockboxes as described in the enclosed test report. As a result of this one of the cover plates was dented but it did not impair the operation of the locking mechanisms. I have enclosed revised sections 2.1.1 and 2.6.9 to show the test results of a modified package as listed above. I trust this answers all of your concerns. Please contact me if you require additional information. Sincerely, [CfIk /hs lkG L $q Cathleen M.Roughan Radiation Safety Officer jaj/CMR84

l 2.' O Structural Evaluation 2.1 Structural Design 2.1.1 Discussion Structurally, the Model 850 consists of four components: A source capsule, shield assembly, outer housing and locking assembly. The source capsule in the primary containment vessel. At satisfies the criteria for special form radioactive material. The shield assembly fulfills two functions. It provides J shielding for the radioactive material and, together with the lock assembly, assures proper positioning of the radioactive source. The outer housing is fabricated from 13 gauge (0.09 inch or 2.3 mm thick) stainless steel. The housing provides the structural strength of the package. Welded onto the four sides of the housing are.25" (6.4mm) thick stainless steel plates and welded onto the bottom housing is a.5 inch (12.8mm) thick stainless steel plate for additionalshielding. These plates are described in drawings 85000-5, -6, and -7. The cover plates protect the lock assemblies. The lock assemblies secure the radioactive source assemblies in the proper shielded position in the package and assures positive closure. 2.1.2 Design Criteria The Model 850 is designed to comply with the requirements of 10CFR71 and IAEA Safety Series No. 6, 1973 Edition. The device is simple in design. There are no design criteria which cannot be evaluated by a straight forward application of the appropriate section of 10CFR71 or IAEA Safety Series No. 6. 2.2 Weights and Centers of Gravity The Model 850 weighs 77 pounds (35 kg), on certain packages the addition of shielding plates will increase the gross weight to 102 lbs (46 kg). The shield assembly contains 49 lbs (22 kg) of depleted uranium. The center of gravity was located experimentally. It is located along the vertical axis at a distance of 4.3 inches (110 mm) above the bottom surface. 2.3 Mechanical Properties of Materials The model 850 housing is fabricated from Type 304 stainless steel. This material has a yield strength of 35,000 lbs per 2 square inch (241 MN/m ). (Ref: Metals Handbook, Vol 1, Eigth Edition). REVISION 2 2-1 FEB 1989 l

O p p. .3 v . Drawingsof the': source. capsules used in conjunction with the -Model'850.are' enclosed'in Section 2.10. These source. capsules L are; fabricated from-Type.-304 or Type 304L stainless steel.- The l

capsules'are sealed:by tungsten inert' gas welding.

l L 3 l-i i l l e f REVISION 2 2-la FEB 1989 l

W 2 6.6 Frm Drop The-drop analysis performed in Section 2.7.1 is sufficient to satisfy the requirements of the normal transport free drop condition. On this basis, we conclude that the Model 850 will l withstand the free drop without loss of shielding effectiveness 1 or loss of package integrity. 2.6.7-Corner Drop Not Applicable j 2.6.8 Penetration A penetration test of the Model 850 was performed. THere was no loss of shielding or loss of structural integrity as a result of j this test. ' A copy of the test report appears in Section 2.10. j 1 8 2.6.9 Compression l The gross weight of the modified Model 850 is 105 pounds (48 kg). Tgemaxim"mcrosssectionalareaofthepackageis42in2 (0.06 m ). T1;6, five times the weight of the package (525 lbs; 2336 newtont,: is greater than two pounds per square inch multiplied by the maximum cross sectional area (184 lbs; 820 newtons). The modified Mode] 850 was subjected to the conditions of the compression test. A load of 525 lbs (2366 newtons) was applied uniformly to the top and bottom of the package for 24 hours. As l a result of this test, there was no loss of. shielding effectiveness nor loss of structural integrity. A copy of the test report is included in Section 2.10. 2.7 Hypothetical Accident Conditions 2.7.1 Free Drop The Model 850 and a Model 850 with the additional shielding plates were subjected to a drop test through a distance of 30 feet onto a steel plate. There was no loss of shielding efficiency nor loss of structural integrity as a result of this test. Copies of the test reports are included in Section 2.10. 2.7.2 Puncture The Model 850 and a Model 850 with the additional shielding plates were subjected to tha puncture test of 10 CFR71. As a result of this test, there was no loss of shielding efficiency nor loss of structural integrity. Copies of the test reports are included in Section 2.10. REVISION 2 j 2-5 FEB 1985 b

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{ ~. impact of puncture bar on lockbo); cover.between h 1-package handles. r 4 J, }.' e t- . ) -4 { ?. s n 1 h gg> =yL \\ a A sL- . _..J ., - - - ~ - + '.+ l ] v. i. .k I 1'.' {c f W 'f 2) Compression Test l, .. m - r 0 's. s i - g ,' g j. I } 1 .I h t .t ~ t >9 g r' A ,o u r w-4 I, ' /. $ C] l-( b d - M-[

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w i f-9 i ,i k i i 1 i 'l i DOCKET NO. b323 CONTROL NO. s i DATE OF 000. 3ff b Ib> O /C b 2 h 'OA DATE RCVD. I FCUF Phk l FCAF Lesa 1 1 & E REF. t/ SAFEGUAU3 / FCTC DTHER 1 DATE INITIAL -}}

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