ML20057F481

Provides Addl Info Per 930915 Request Re Application for Renewal of Coc 9222 for Model 14-215 Shipping Package

ML20057F481
Person / Time
Site:	07109222
Issue date:	10/04/1993
From:	Ramsey T SCIENTIFIC ECOLOGY GROUP, INC.
To:	Chappell C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
NUDOCS 9310180071
Download: ML20057F481 (8)

Text

-

a W~ 9E AS SCIENTIFIC ECOLOGY GROUP, INC.

j a

October 4,1993 i

Mr. Cass R. Chappell, Section Leader Cask Certification Section i

Storage and Transport Systems Branch Division of Industrial and Medical Nuclear Safety, NMSS t

U.S. Nuclear Regulatory Commission Washington, D.C., 20555-0001 r

Dear Mr. Chappell:

We are pleased to provide the additional information you requested in your letter dated September 15, 1993, concerning our application for the renewal of Certificate of Compliance No. 9222 for the Model No.14-215 shipping package. The information you requested is included within Attachment I to this letter. The responses provided within Attachment I correspond to items 1, 2, and 3 listed in the enclosure of your letter.

If you have any questions about our responses or the application please contact me at 615-376-8156.

Sincerely,

[

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Timothy B. Ramsey Senior Engineer ltr-053-vs 140007 9310180073 931004 F

DR c

ADUCK 071ogggy G

. P.O. Box 2530 PDR E

1560 Bear Creek Rd.

f'u Box 2308 1934 Colum ia Dr. SI.

Oak Ridge, Tennessee 37831-2530 Carlsbad, New Mexico 88220 Richland, Washington 99352 (615)481-0222 (505) 887-1673 (509)7364626

ATTACHMENT 1 i

, Responses to request for additional information, items 1, 2 and 3 l

1.

Note 21 on Drawing No. STD-02-077 is to allow a substitution of a 1-1/4" x 5 threads l

per inch (tpi) Acme screw thread for the 1-1/4"-12UNF thread specified for the ratchet binder threaded -parts. This option is requested to eliminate operatienal problems associated with the fine threads. However, because the 1-1/4" x 5 tpi Acme thread has a reduced tensile stress area compared to the 1-1/4"-12UNF thread, a higher yield strength is required to achieve the same rated capacity of 100,000 pounds. The intent of the note is to require the bolting material used for the Acme thread to have a minimum tensile yield strength of 125,000 psi. Because of material availability for high alloy steels l

which would meet this requirement, a specific material type (i.e., 4340) was not i

specified. It was not intended to use the ASTM A320 Gr. L-7 for the Acme thread bolting material because of the lower tensile yield strength.

i 2.

Items 32 and 33 are the lower and upper blocks for the ratchet binder respectively. Item 32, the lower block, is machined to allow the socket headed bolt, item 34, to rotate j

freely during the tightening or loosening of the ratchet binder. Because of the general dimensions of a socket head bolt with Acme thread will be identical to the socket head bolt currently in use, no changes to the lower block will be required. A call out to Note l

21 was added to the thread designation for item 33, the upper block, to note the optional use of the 1-1/4" x 5 tpi Acme thread. If the 1-1/4" x 5 tpi Acme threads are used, the i

current upper block will require replacement with one that has been tapped for the Acme 7

thread. The block will not require any other modifications and will not have any loss of

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capacity for the change in the threads. The shear stress in the threads of the upper block are analyzed below to substantiate acceptability.

Using data from the Machinery's Handbook, Twenty-first Edition, (pertinent sheets' attached) the shear area in the threads can be calculated using the equation below. The l

most conservative value for the shear area is obtained by using values for the minimum i

I pitch diameter, Es, and the maximum minor diameter, Kn, for a Class 2G fit.

Shear Area, As = 3.1416(Kn)(0.5 + 1/p tan 14.5(Es - Kn)) (in per inch) l 2

from Table 2b Es = 1.1210 Kn = 1.0600 i

As = 3.1416(1.0600)(0.5 + 1/0.2 tan 14.5 (1.1210 - 1.0600) 2 As = 1.928 in /in Using Drawing No. STD-02-077 the maximum thread engagement of the socket head bolt in the upper block can be determined to be 1.875 inches. The engagement is determined l

with the ratchet binder being in the shortest configuration when tightened on the cask.

t

1 With this data the total shear area of the threads may be obtained by multiplying the l

engagement by the shear area to give, 2

At = 1.928 in /in x 1.875 in i

.At = 3.615 in2 i

By muliiplying the total shear area by the yield stress of the upper block material (A516 Grade 70, Fy = 38,000 psi) the yield capacity of the threaded area is obtained as

follaws, 2

Yield capacity = 38,000 psi x 3.615 in

= 137,370 pounds Comparing this to the rated capacity of the ratchet binder of 100,000 pounds the margin of safety is determined to be, M.S. = 137,370/100,000 - 1 M.S. =.37 Based on the analysis above, the upper and lower blocks are acceptable for use with the i

optional 1 U'" x 5 tpi Acme thread with no change in configuration or material i

properties.

i 3.

The equation used to determine the tensile stress area of the Acme thread is normally used for unified threads (i.e., UNC, UNF) however, when applied to Acme threads it t

provides a conservative value for this area. Using data from the Machinery's Handbook, i

Twenty-first Edition, a more exact value of the tensile stress area may be calculated. The l

tensile stress area may be obtained from the equation below and Tables 2a and 2b. The most conservative value of the tensile stress area may be calculated when using the values for the minimum minor diameter, Ks, and the minimum pitch diameter, Es, for l

a Class 2G fit.

j Tensile Stress Area, A = 3.1416((Es+Ks)/4)2 from Table 2b Es = 1.1210 i

Ks =.9998 A = 3.1416((1.1210+.9998)/4)2 A =.883 in2 I

As can be seen this value is slightly larger than that calculated on page 2-59 of the application demonstrating the use of the equation for unified threads is more conservative.

i

MACHINERY'S HANDBOOK t A Reference Bookfor the Mechanical Engineer, Draftsman, Toohnaker and Machinist 1

By ERIK OBERG, FRANKLIN D. JONES and HOLBROOK L. HORTON PAUL B. SCHUBERT, Editor K. H. MOLTRECHT, Assistant Editor Henny H. Rvreet, Consulting Editor TWENTY-FIRST EDITION, Third I'rinting,1980 INDUSTRIAL PRESS INC.

200 Madison Ave., New York, N.Y.10016 i

1

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ACME SCREW THREADS 1325 American National Standard General Purpose Acme Screw Thread Form (ANSI Br.5-1977). and Stub Acme Screw Thread Form (ANSI Br.8-1977)

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.25p (TOR ACME THREADS);

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15p (FOR STUB ACME THREADS)

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Formulas for Finding Basic Dimensions of General Purpose Acme and Stub Acme Screw Threads

• General Purpose Acme Threads Stub Acme Threads Pitch = p - I + No, threads per inch Pitch - p - I + No. threads per inch Basic thread height A - o.5p Basic thread height A - o.3p Basic thread thickness t = o.sp Basic thread thickness t - o sp Basic flat at crest Fen = o.37o7p Basic flat at crest Fen = o.4224p (internal thread)

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(internal thread)

Basic flat at crest Fcf= o.37o7A - o.259 X Basic flat at crest Fe, = o.4224p (P.D. allowance on ext. thd.)

(external thread)

Fin = o.37079 - e.259 X (maior diam.

Fro - c.4224p - o.259 X (major diam.

adowance on internal thread) allowance on internal thread)

Fe, = o.3;o7p - c.259 X (minor diam.

Fr, - o.4224p - c.259 X (minor diam.

allowance on ext. thread - pitch allowance on ext. thread - pitch diam. allowance on ext. thread) diarn, allowance on ext. thread)

Stress A rea of General Purpose A cme Threads.-For computing the tensile strength of the thread section, the minimum stress area based ori tbe mean of the minimum pitch diameter E, and the minimum minor diameter K, of the external thread is used:

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Stress Area = 31416 where E, and K, may be computed by Formulas 4 and 6. Table sa or taken from Table 2b.

i Shear Area of General Purpose Acme Threads. For c'omputiny the shear area ner inch length of engagement of the external thread, the maximum mmor diameter of the in-ternal thread Kn. and the minimum pitch diameter of the external thread E,, Table 2b or Formulas 22 and 4, Table 2a. are used:

Shear Are. = 314r6Kn o.5 + p-tan I4M *(E. - Kn)-

• Tables I and 6 give basic dimensions for various pitches.

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1326 ACME SCREW THREADS s

Table I.

American National Standard General Purpose Acme Screw Thread Form-Basic Dimensions * (ANSI BI.5-1977) j t

i Width of Flat l

Thread Crest of In e 1

Thds, Height of H

it of per

Pitch, Thread Thickness Internal Thread'

Thread, Inch (Bas 2c),

(Basic).

Thread (Basic),

o.37o7p -

p/2 + %

0.259 X n

p = I/n p/2 allowancet p/2 o.37o7p allowancet i;

16 o.o6250 0.03I25 o.o362 o.o3125 o.o232 o.o206 14 o.07I43 o.o357I o.0407 0.0357I o.o265 c.o239 12 o.o8333 o.o4167 o.c467 o.c4167 o.o3og o.o283 Io 0.I0000 0.05000 o.o6oo o.o5ooo o.0371 o.0319 8

o.I25oo o.o625o 0.0725 o.o625o o.c463 o.o4II 6

o.16667 o.o8333 0.0933 o c8333 o.o618 o.oS66 5

0. 2%N

o. INN o.IIM

0. Ioom 0.074I o.o689 4

o.25000 o.125oo o.1350 o.I2500 0.0927 0.0875 3

0 33333 o.16667 o.I767 o.I6667 o.1236 o.II84 2H o.40000 c.20000 0.2I00

o. 200N o.1483 0.1431 2

o.50000

0. 25cm o.26oo o.25ooo o.I853 o.18o2 IM o.66667 o.33333 0 3433 0.33333 0.247I o.2419 IM o.75ooo 0 375N o.3850 0 375m o.278o.

o.2728 I

I.cocco o.50000 0 5Im o.500N 0 3707 0 3655 l

• All dimensions are in inches.

i Allowance is o.o2o inch for Io threads per inch and coarser, and o.oto inch for finer threads.

Table 2a.

American National Standard General Purpose Acme Screw Threads -

Formulas for Determining Diameters (ANSI DI.5-1977)

I D = Basic Maior Diameter and Nominal Size in Inches.

p = Pitch = I + Number of Threads per Inch.

E = Basic Pitch Diameter = D - o.5p K = Basic Minor Diameter = D - p No.

EXTERNAL THREADS (SCREWS)

I Major Diam., Max. = D 2

Major Diam., Min. = D minus o.o5p' but not less than o.co5 3

Pitch Diam., Max. = E minus allowance from Table 4. '

l 4

Pitch Diam., Min. = Pitch Diam., Max. (Formula 3) minus tolerance from Table 5 5

Minor Diam., Max. = K minus o.o2o for Io threads per inch and coarser and o.cIo

!I for finer pitches.

'i 6

Minor Diam., Min. - Minor Diam., Max. (Formula 5) minus I.5 X pitch diam-eter tolerance from Table 5 Ir INTERNAL THREADS (NUTS) 7 Major Diam., Min. - D plus o.c2o for zo threadt ;.u.ach and coarser and o.oto jj for finer pitches.

8 Major Diam., Max. = Major Diam., Min. (Formula 7) plus o.o2o for Io threads per inch and coarser and o.clo for finer pitches.

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9 Pitch Diam., Min. = E Io Pitch Diam., Max. = Pitch Diam., Min. (Formula 9) plus tolerance from i

Table 5

,j II Minor Diam.. Min. = K 22 Minor Diam., Max. = Minor Diam., Min. (Formula II) plus o.o5p' but not less than o.cos.

• If p is between two recommended pitches listed in Table 3, use the coarser of the two pitches in this formula instead of the actual value of p.

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