ML19310A954

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Application to Amend Certificate of Compliance 5341,Revision 3,revising Item 5.(a)(2) Re Exceptions to DOT Spec 6M & Deleting Item 6.Results of Addl Testing,Including 30-ft Drop Test Encl
ML19310A954
Person / Time
Site: 07105341
Issue date: 05/14/1980
From: Cordani R
BABCOCK & WILCOX CO.
To:
References
16412, NUDOCS 8007010553
Download: ML19310A954 (10)
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Babcock &Wilcox u,,,i nucie,, roei Di,,,an

. P.O. Box 785, Lynchburg,Va. 24505 Telephone:(804) 384-5111

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May 14, 1980 Mr. Charles E. MacDonald Transportation Branch Division of Fuel Cycle and Material Safety U. S. Nuclear Regulatory Commission Washington, D. C.

20555

Dear Mr. MacDonald:

Babcock & Wilcox, Naval Nuclear Fuel Division, requests approval of revisions to NRC Certificate of Compliance No. 5341.

Please make the following changes to revision 3 of this certificate:

1)

Change item 5.(a)(2) to read as follows:

Packaging as described and constructed in accordance with l

DOT Specification 6M except:

(i) the sides and the ends of the containment vessel must have a minimum of 7" in ~

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sulation, (ii) the insulation shall be fitted such that the radial cicarance between the insulation and the outer shell does not exceed 5/8 inch.

2' Delete item 6 on page 2 of the certificate.

Item 1) above was changed to more accurately describe the actual shipping container.

Item 6 on page 2 of the certificate is being de-leted because the inner container has only one threaded cap closure (the other end is a welded plate) which will no longer be sealed with teflon tape. The structure of the inner container meets the require-ments of the DOT 2R pecification (49 CFR 178.34).

The contents of the or1 1nal application, for this container, dated 8

June 23, 1967 and supplement dated January 5, 1970, remain accurate and correct with the only difference being replacement of the plywood spacer and vermiculite insulation with plywood and fiberboard insulation discs.

164.13 8007.0-10 5 @

ne saocoa a mcox company i establisneo iss7 7

E' Babcock &Wilcox Mr. Charles E. MacDonald May 14, 1980 B&W has conducted some additional testing on this container design.

The tests included a 30-foot drop test for the entire shipping container, a leak test and destructive metallurgical evaluation of the plate weld on the inner containment vessel.

See the attached information for de-tails of the tests and results.

Enclosed is a check in the amount of $150.00 to cover the admin-istrative fee required by 10 CFR 170.12.

Sincerely, BABCOCK & WILCOX R. A. Cordani Nuclear Safety & Licensing Officer RAC/bjc Enclosures l

Page 1 of 8 ll ADDITIONAL TESTING AND RESULTS FOR SHIPPING CONIAINER SPECIFIED ON CERTIFICATE OF COMPLIANCE No. 5341 30-Foot Drop Test - The shipping container assembly was dropped (free fall) from a vertical distance of 30 feet. Damage to the container included com-pression of the lower roll-hoop by approximately 50%, and slight deforma-tion on the bottom edge. The attached photographs show the test set-up and damage after the drop.

There was no damage to the inner container i insulation discs 'and there was no loss of nuclear safety spacing.

Weld Evaluation - The 2R specification inner container consists of a sec-tion of 5-inch schedule 40 steel pipe with one end closed by a welded plate and the other end with a threaded cap closure. The weld on the bottom plate weld was destructively evaluated at 100X magnification.

The weld integrity is good with a minimum wall thickness of 0.105 inches.

This wall thickness is more than sufficient to withstand any foreseeable impact or internal pressures which could be created during normal or acci-dent conditions.

I Leak Test - The threaded cap closure was luted with Dow Corning Silicone Vacuum Grease and leak tested in accordance with ANS1 14.5 (November, 1974), Appendix A, paragraph A2-10 (Helium gas fill). The table below provides the details of this test which was performed three times.

Calibrated Standard Test Piece Tes t No.

Leak Rate (atm - cc/sec.)

Leak Rate (atm - cc/sec.)

1 3.27 x 10-8 3.1 x 10-7 2

3.27 x 10-8 5.8 x 10-7 3

3.6 x 10-8 3.8 x 10-8 These very small acceptable leak rates approach leak tightness as defined tor ANSI 14.5.

The scalant used on the threads maintains consistency from

-40*F to 500*F.

The' pressure differential during this test was 1 atmosphere against a vacuum of~0.1 micron which significantly exceeds the requirements of ANSI 14.5.

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View showing damage to the outer drum roll hoop. The decrease in width of the roll hdop is approximately 50 percent.

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(The lead brick was used to simulate the weight of a loaded container.)

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