ML20205H957
| ML20205H957 | |
| Person / Time | |
|---|---|
| Site: | 07109168 |
| Issue date: | 11/30/1985 |
| From: | CHEM-NUCLEAR SYSTEMS, INC. |
| To: | |
| Shared Package | |
| ML20205H954 | List: |
| References | |
| 0072C, 72C, NUDOCS 8601300044 | |
| Download: ML20205H957 (9) | |
Text
_
Revision 5 November 1985 e
s SAFETY ANALYSIS REPORT FOR CHEM-NUCLEAR SYSTEMS, INC.
MODEL CNS 8-120B TYPE B RADWASTE SHIPPING CASK f
A B601300044 851209 "'
pyg Chem-Nuclear Systems Inc.
220StoneridgeDrive Columbia, South Carolina 29210 s
007?C r-
-n
,,,...,. -.,.,. -, ~-
,-.,p--
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~-
Strength (ksi)
Young's Coefficient of Grade Temp Modulus Thermal Expansion Material or et Yield Ult.
Allow.
Type' (1)
(2)
(3)
(10 psi)(4)
(10-6in/in/*f)(5) 6 LSTM A516 Plate 70 70 38 70 23.3 27.9 (Inner and outer shells 100 38 23.3 6.50 200 34.6 23.1 27.7 6.67 Ilds, base plates 300 33.7 22.5 27.4 6.87 overpack plates, 400 32.6 21.7 27.0 7.07 500 30.7 70 20.5 26.4 7.25 and fireshield)
I ASTM A570 (overpack shell)
(note 6)
A
.RT 25 45 1F 29.9 6.50 I
52.5" 70 100 110 29.9 6.41 (10)
ASTM A514 E
or m(
' ASTM A517 0~
(Tie-down arms, lifting 70 90 105 29.9 6'.41. ( 10 )
" L, ears, lugs, and bolt 2.5"-6" ring 2.0 16.3 LSTM B29 Lead C
70 5
Ilynamic (8)
Compression flinimum (8)
~*
29.9 6.5 i ASTM A354 2-80tl BD 70 130 150
[ Lid closure bolts)
(9)
(9)
ASTil r1541j-7UNC 00 70 130 150 29.9 '
6.5
~
(Lifting ear bolts)
(9)
(9)
=
S, EE l
.29.9 6.5 60 A
70 U
l GTM A307 (9) 3 (Drain plug bolt) l (Vent / test pluq bolt) m TABLE 2.3-1 MATERIAL PROPERTIES
Revision 5 November 1985 References for Table 2.3-1 (1) ASME Code,Section III, Appendices, Table I-2.1 (2) AStiE Code,Section III, Appendices, Table I-3.1 (3) ASME Code,Section III, Appendices Table I-1.1 (4) ASME Code,Section III, Appendices Table I-6.0 (5) ASME Code,Section III, Appendices, Table I-5.0, Coefficient B.
(6) Data from ASTM Standard is provided for information only, and is not used in safety analysis calculations.
(7) ASME Code,Section III, Appendices, Table I-7.1 (8) Cask Designer's Guide, ORNL-NSIC-68.
(9) ASTM Specification.
(10) ASME Code,Section III, Appendices, Table I-5.0, Coefficient A.
0 2-17
Revision 5 November 1985 2.4.4.4 Cask Stress Analysis (continueo)
((
R3 = 58188 lbs.
R4 = 40800 lbs.
RS = 24245 lbs.
R6 = 17000 lbs.
(2) ' Evaluation of Cask Stresses The stress results are surmarized as follows:
Max Shear Stress Element Factor (her.b. + bending) Number of Safety 3
Cask Ltd 1868 psi 257 10.17
(
Exterior Cask Shell 12,400 psi 353 1.53 Cask Bottom 1243 psi 627 15.28 The factors of safety are determined as:
7,3,, { shear allowable (membrane + bending))
' shear max.
' shear allowable = h = h 19 ksi for A516 Gr 70.
where:
2.4.4.5 Lid Bolt Stress Analysis (1) Lid Bolt Stresses The cask lid is held in place by 20 ASTM A354 Grade BD 2-8 UN x 4" bolts, equally spaced around the cask perimeter.
2-63
R2Vicicn 3'.
C:v dbar 1984 l
I During the 10-5-2 g loading, forces are generated in the lid bolts.
The forces. consist of direct bolt tension and bolt In addition, the lid bolts experience a tension due to a prying action bending mosent which shear.
exists between the side wall of the cask and the These forces and moments vary in cask lid.
magnitude and direction around the circumference of the cask, and weru determined from the results of the cask finite element stress analysis outlined in Section 2.4.4.5(2).
The maximum lid bolt loads were determined in Section 2.4.4.5(2), and are shown in Figure 2.4.4.-16(a) as follows:
Vx = 73515 lbs.
Vy = 11873 lbs.
Vz = 16965 lbs.
= -45240 in-lb.
M Shear Stress Since both Vx and Vy act in the plane of the cask lid, they combine to form a resultant shear force on the bolts.
F shear = {(Vx)2+ (Vy)Z
+ (-11875)4
= J~(73515)4
=74467 lbs.
Net bolt area for the 2" - 8 UN x 4' bolts is 2
2.77 in,
This yields a nominal shear stress of:
nominal = F h A olt b
G". 74467 lbs.
2 2.77 in I
d;
= 26883.7 psi 2-64
~~
s Revision 3 November 1984 2.4.4.5 Lid Bolt Stress Analysis (continued)
According to ASTM specification A-354, the yield strength for grade BD 2" -8 UN bolts is 130000 psi.
Therefore:
dIallowable - (o.5) ( yi,1,3. (o.5)(13oooo3 6sooo psi The associated factor of safety is F.S. = allowable. 65000
= 2.35 d' actual 27682 (2) Analytic Method for Determining Lid Bolt Loads Since the lid bolts were not specifically modeled in the finite element geometry, the lid bolt loads (forces and moments) were not directly-
{-
available from the finite element cask stress analysis output. The method used for determining these loads is described in the following paragraphs.
A typical section of.the finite element model where the outside edge of the cask lid joins the cask side wall is shown in Figure 2.4.4-17a.
The global corner forces for each of the four plates at the adjoining node is shown in Figure 2.4.4-17(b).
Numerical values of these corner forces were extracted from the finite element analysis output (Table 2.4.4-1) for each node along the outer edge of the lid (nodes 97 through 128).
The global corner forces were added as shown in Figure 2.4.4-17(c).
Numerical values for these resultants, Px, Py, Px, Mx, My, and Mz, are given in Table 2.4.4-2.
t 2-69
Revision 5 November 1985 2.4.4.5 Lid Bolt Stress Analysis (continued)
The global corner forte sums.cf Figure 2.4.4-17(c) were rotated into a local (edge) coordinate syster, for each node as shown'in Figure 2.4.4-18(a).
P'x, P'y, P'z, Mx, M'y and h'z are given in Table 2.4.4-3 and represent the unbalanced nodal loads which must be transmitted from the upper side of the cask body to the' lid via the joint continuity provided by the lid bolts. M'y and M'z were founti to be zero in the local (edge) coordinate system.
Since the nodes along the outer edge of the lid do not coincioe with the bolt locations, the loads of Figure 2.4.4-18(a) were first converted into loads per inch of lid circumference, (1b/in anc.
irt-1b/in) as shown in Fibure 2.4.4-18(b). Numerical values for q,,
q,, q, and qm, are given in Table 1.4.4-3 and plotted with
- respect to circun.ferential position in Figure 2.4.4-16.
Peak edge loads were found froni Figure E.4.4-19 to be:
i q, = WO lb/in p
= 1050 lb/in q
PS = 1500 lb/in q2 p
o, = -4000 i n-1 bs/i r.
p Even though these peak loads occur at different circun.ferential positions, they were conservatively assumed to occur simultaneously-for detemining the maximum lid bolt loads.
The maximum bolt load was determined by multiplying the peak edge loads by the circumferential spacing between bolts as shown on Since the 20 bolts are equally spaced around the figure 2.4.4-20.
l lid circumference, the spacing between the bolts is:
j 1= 2wr/20 bolts = 10.7 in.
G 2-70 l
Revision 5 November 1985 4.0 CONTAINMENT This chapter describes the containment configuration of the Model CNS 8-120B Package for Normal Transport and Hypothetical Accident Conditions.
4.1. Containment Boundary 4.1.1 Containment Vessel The package containment vessel is defined as the inner shell of the shielded transport cask, together with the associated lid, 0-ring seals and The inner shell of the cask or containment vessel consists lid closure bolts.
of a right circular cylinder of 62 inches inner diameter and 75 irches inside The shell is fabricated of 3/4 inch thick carbon steel plate, height.
At the base, the cylindrical shell is attached to a circular ASTM A516-70.
end plate with full penetration welds. The primary lid is attached to the A secondary lid cask body with twenty (20) equally spaced 2-8 UN bolts.
covers a 29 inch opening in the primary lid and is attached to the primary lid See Section 4.1.4 for closure using twelve (12) equally spaced ?.-8 UN bolts.
detail s.
4.1.2 Containment Penetration There are four penetrations of the containment vessel.. These are (1) an optional drain line; (2) a. primary lid seal test port; (3) a secondary lid seal test port, and (4) a cask vent port located in the primary ifd.
Located at the cask base, the drain line consists of a 2 inch diameter steel rod drilled to 0.75 inches diameter penetrating into the second 3-1/4 inch A 0.63 inch diameter hole, drilled layer of steel that forms the cask bottom.
at a right angle, opens on the side of the outer shell near the cask bottom.
4-1
Revision 5 November 198{
a The two seal test ports penetrate to the space between the double seals on both the primary and secondary lids. A vent port penetrates the primary lid in:o the main cask cavity. All four penetrations are sealed with silicone Pr.rker Stat-0-Seals or equivalent.
4.1. 3 Welds and Seals The containment vessel is fabricated using full penetration groove wel ds. Seals are described in Sections 4.1.2 and 4.1.4 4.1.4 Closure The primary lid closure consists of two 3-1/4 inch thick lamiaated plates, stepped to fit over and within the top edge of the cylindrical body.
The lid iG supported at the perimeter of the cylindrical body by a three inch thick plate (bolt ring) welded to the top of the inner and outer cylindrical
~
body walls. This plate contains a 14 gauge stainless steel ring at a location which corresponds to the sealing surface for the 0-rings mounted in the lid.
The lid is attached to the cask body by twenty (20) equally spaced 2-8 UN bol ts. These bolts are torqued to 500 ft-lbs. + 10 percent (lubricated). Two (2) solid, high temperature silicone 0-rings are retained in machined grooves 4
at the lid perimeter. Groove dimensions prevent overcompression of the 0-rings by the closure bolt preload forces and hypothetical 4ccident impact forces. The cask is fitted with a secondary lid of similar construction attached to the primsry lid with twelve (12) equally spaced identical bolts.
The secondary lid is also sealed with two (2) solid, high temperature silicone
.0-rings -in machined grooves.
The vent, test ports, and drain penetrations are sealed with Parker Stat-0-Seals which are used beneath the heads of the hex head cap screws.
Table 4.1.4 gives the torque values for the cap screws.
1 4
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