ML19247A173
| ML19247A173 | |
| Person / Time | |
|---|---|
| Site: | 07106244 |
| Issue date: | 06/05/1979 |
| From: | Reynolds L CHEM-NUCLEAR SYSTEMS, INC. |
| To: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 7907300187 | |
| Download: ML19247A173 (6) | |
Text
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CHEM-NUCLEAR S.YSTEMS INC.
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P.O. Box 1866 e Bellevue,Washingtori 98009iE>(206) 827-o711 7 a;N ;I R.1 11 0 I u.s.h n '_ J REG-June 5,1979 COMNS5;CH Mr. Charles E. MacDonal[Ss Matt SECT 10,9 Transportation Branch Division of Fuel Cycle and Material Safety U. S. Nuclear Regulatory Comrcission Washington, D.C. 20555
Dear Mr. MacDonald:
We respectfully request that Certificate of Ccmpliance No. USA /6244/B be amended to reflect the following changes. This request supercedes /
CNSI requests dated February 21, 1979 and March 23, 1979.
(1) Revise Drawing No. 6930-1, Rev. D to Rev. E, sheet 1 of 2, which specifies the following:
(a) Revise specification 1.4 to require a torque value of 180 foot pourds for cask lid bolts. Attachment 1 to this application is our safety analysis of the revised torque value.
(b) Removal of denineralizer and related components from. drawing.
(2) Revise Drawing No. and Sheet frcm N-69-12-438 sheet 4 of 4 to 6930-1, Rev D Sheet 2 of 2.
This drawing specifies the following:
(u, Revised grade callout of 3/4" lid bolts from 5 to 8.
(b) Revised length of 5/8" overpack bolts from 1 1/4" to 2".
(c) Added size and material of cask lid gasket.
(d) Same as 1-b.
(3) Change C of C condition 5 (b) contents to ed j
(1) Type and form of material (i) Greater than Type A quantitites of byproduct Aqz "d / 4 7
material n process solids, either dewateredy ( U solid, or solidified, in secondary containers, or
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(ii) Greater than Type A quantities of byproduct material as solid metal components in secondary containers, as required.
(2) Maximurr. ouantity of material per package -
Not to exceed 10 thermal watts of byproduct material (4) Revise C of C condition th. 8 to read:
8.
The polyurethane lid gasket shall be inspected after each shipment and shall be replaced when any significant seating surface damage is observed.
(5)
In Conditic.. (a) Packaging (2) Description delete the sentence which reads, "The space between the secondary container and the lead is filled with an aluminum honeycomb material for the Type B packaging".
On March 1, 1979, you advised us that our requests had been classified as a minor amendment and a fee of $690 was paid.
We trust that the information submitted with this request will permit you to make an early determination of our application.
Please contact our office if you have any questions.
Sincerely, CHEM-NUCLEAR SYSTEMS, ItiC.
W N Louis E. Reynolds Oirector Regulatory Affairs LER/cm Enclosures A26 2,/ b 131GO
SAFETY ANALYSIS FOR CASK LID BOLTS TORQUED TO 180 FT. POUNDS From page G-20 of the Engineering Evaluation dated March 16, 1970 the maximum moment is 9.9x106 in, lbs.
Maximum lead on lid = 9.9x106 in. lbs.
L
=
L 29 in. moment arm 341,,379 lbs.
=
Total load each bolt must withstand = Fj (Bn ( i) wh re B = number of boks L
=
n 341,379 = (24)(F )j Fj" 14,224 lbs.
Torque to insure that preload 2 Fj T - 0.20 F d where F = preload j
j d = bolt diameter 0.20 = coefficient of friction T = (0.20)(14,224)(0.75)
= 2133 in lbs = 178 f t. lbs.
Use 180 ft. lbs.
Safety factor calculations:
Safety factor for thread shear = S.F.3 A = 7dl where A = area in shear s
s d = bolt diameter 1
= length of thread (3.14)(0.75)(1.5)
A
=
s 3.53 in2
=
S* = Fj wl.ere Fj = preload r
426 2,76 s
S = bolt threads in shear 131GS
14,224 lbs S
=
s 3.53 in.4 4029 psi
=
Maximum allowable shear for A-516 material is 17,500 psi = Sm S.F.s= Ss S
" 17,500 4.34
=
2 4029 Safety factor for bolt tensile failure = S.F.T where S Stress in tensile T
T = Area of bolt S
Fi AB
G d = Diameter of bolt ST = 11,224-- =
32,210 ?si 0.4416 fB = Yield strength for Grade 8 bolts = 130,000 psi S.F.T =
130,000 = 4.03
=
ST 32,210 The above calculations demonstrate that bolts are sate in shear and tensile.
Reference:
Shigley, " Mechanical Engineering Design,1977 Edition 426 277