ML20235U041
| ML20235U041 | |
| Person / Time | |
|---|---|
| Site: | 07109183 |
| Issue date: | 09/30/1987 |
| From: | Danese F NAC INTERNATIONAL INC. (FORMERLY NUCLEAR ASSURANCE |
| To: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20235U043 | List: |
| References | |
| 28637, NUDOCS 8710130333 | |
| Download: ML20235U041 (9) | |
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' September 30, 1987
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-i Mr. Charles E. MacDonald, Chief Transportation Certification Branch
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Dear Mr. MacDonald:
._ j The Nuclear Assurance Corporation hereby requests an amendment to Certificate of Compliance Number 9183, Revision 5, to incorporate a revision to the handle of the manually operated valve used in the vent, drain and 0-ring pressure test ports; and to permit the use of an alternate configuration of the cask closure lid having a 3/8 inch chamfer on its lower outside edge.
The revised conf.gurations of the valve handle and the closure lid are shown in Revision 22 of the license drawings, specifically sheet 2 (of 4).
The appropriate notes are included on sheet 1 (of 4).
Certain pages of the Safety Analysis Report have been revised to incorporate these changes, and copies of the revised pages are enclosed.
The suggested revision to the Certificate is to change paragraph 5. (A),
(3) to reference Revision 22 of Drawing Number E 10080, sheets 1 through 4 dated September 30, 1987.
In accordance with 10CFR170.31, a.@eck for $150.00 is enclosed as the application fee for this amendment.. E Please contact either Dr. Alan Wells, or me, if you have any questions or require additional information.
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Manager, Cask Operations h/c// 7 Engineering and Transportation Systems
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Enclosures:
PDR 10 copies: Drawing E 10080, 4 sheets Revised pages of SAR
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' Containment This section defines and discusses the containment configuration of the NAC-1 Cask for normal transport and hypothetical accident conditions.
4.1 Containment Boundary The containment boundary is the surface and seals that prevent leakage of-the radioactive material being transported in the cask.
4.1.1 Containment Vessel The primary containment boundary of the NAC-1 cask is the inner shell, the lower end casting, the upper end casting, the bolted closure lid with two teflon 0-rings, the drain and vent valves, and the rupture disk.
1 The inner shell of the cask is a 0.31 inch thick austenitic stainless steel right I
circular cylinder with internal dimensions of 13.5 inches diameter and 166.5 inches length.
At each end the shell is welded to large austenitic stainless 1
steel end castings.
The lower end casting is 2.5 inches. thick with a central I
region that is an S-inch thick frustum of a cone.
The upper end casting is 8
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inches thick and annular with a tapered central hole that mates with the closure
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lid. The austenitic stainless steel closure lid is a 7.5 inch thick frustum of a cone with a 2.0 inch thick flange around its circumference at the larger end.
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THe closure lid is retained by six, equally-spaced 1-1/4-7UNC ASTM A320 Grade L43 low alloy steel hex head capscrews and is sealed at the upper end casting by two l
teflon 0- ri ng s.
The d rain and vent valves are Miser Fire Valves, Worcester Controls Corporation part number 1/2 FG466TSW, or equivalent.
The rupture disk is an 1N-VAL-C0 part number TA-1, or equivalent, and its associated relief valve is a Circle Seal part number M5120-TI-IM, or equivalent.
4.1.2 Containment Penetrations in addition to the primary access opening through the top of the cask, five other penetrations through the containment boundary of the NAC-1 cask are considered.
These penetrations are located on Figure 4-1 and are detailed in Figures 4-2, 4-3, and 4-4.
The vent valve located in the upper end casting and tre two drain valves located in the lower end casting permit draining and venting of the containment vessel during loading and unloading operations.
Each of these valves is a fire-rated ball valve rated at 985 psig at 520 F and protected within a recess in the impact limiters and having a sealed cover.
The handle on each of the valves is long enough so that the valve must be closed before the port cover can be installed, i
The pressure relief system located in the upper end casting provides emergency relief in the unlikely event of overpressurization of the cavity.
The pressure relief system consists of a rupture disk rated at 300 p'sig at 600*F and a relief valve rated at 200 psig at 350 F which are protected within a recess in the impact l imi ter, and having a sea' led cover.
The cover is specially designed to rupture in the event of actuation of the rupture disk.
The relief valve will close when the cavity pressure drops below 200 psig, thus resealing containment.
Revised September,1981 4-1
UPPER IMPACT LIMITER STRUCTURE CLOSURE LID UPPER CASTING J
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VENT VALVE (UPPER END CASTING)
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CHANNELS INTO O-RING SEAL (TYP)
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LOWER IMPACT LIMITER LOWER CASTING STRUCTURE Figure 4-3.
DRAIN VALVES (LOWER END CASTING)
Revised September 1987 L___
UPPER IMPACT LIMITER STRUCTURE.
UPPER CASTING 0.375 x 45' Chamfer d
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CLOSURE LID
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C C' BORE TO.005 IN. THK-PORT COVER WITH 0-RING SEAL-l Revised Figure 4-4 PRESSURE RELIEF SYSTEM September 1987 4-5
There is one other penetration in the wall of the upper end casting.
It is used to pressurize the region between the Teflon o-rings to assure the adequacy of the closure lid seal prior to shipment (Figure 4-5).
This penetration does not directly enter the containment vessel because the inner Teflon o-ring always provides a seal between the cask cavity and this penetration.
However, this penetration is considered a part of the containment boundary tc assure that there is no possible loss of containment during shipment. The penetration is sealed by a fire-rated ball valve and protected identically to the vent and drain valves.
4.1.3 Seals and Welds The 14.12 inch outside diameter, austenitic stainless steel containment shell is joined to the austenitic stainless steel upper and lower end castings utilizing circumferential full penetration groove welds.
All weld configurations are designed and fabricated to meet the intent of the ASME code.
The closure lid o-ring seals are Teflon material.
They are C.E.
- Conover, Fairfield, New Jersey, part number P/N R513-466 and P/N R513-469, or equivalent.
The value cover o-ring seals are Parker 2-004-S604-70 and Parker 2-248-5604-70, or equivalent.
4.1.4 Closure The closure lid is the shape of a 7.5 inch thick frustum of a cone with a 2.0 inch thick flange around its circumference at the larger end. A 0.375 inch x 45' chamfer on the lower outer edge of the lid flange is optional; it has no significant effect on the lid's structural adequacy.
The lid is fabricated from austenitic stainless steel.
It is retained by six, equally-spaced,1-1/4-7UNC ASTM A320, Grade L43, low alloy steel hex head capscrews and is sealed at the upper end casting by two Teflon o-rings.
The required installation torque on the closure lid bolts is 650 (+30,-0) foot-pounds (lubricated).
(See Section 2.7.1.4).
4.2 Requirements For Normal Conditions of Transport During normal conditions of transport there shall be:
(1) no direct release of radioactive material from the containment vessel; (2) no significant reduction in the package effectiveness due to increased pressurization of the containment vessel; (3) no coolant contamination in excess of the maximum specified permissible levels; (4) no loss of coolant; and (5) no venting of the containment vessel directly to the atmosphere.
4.2.1 Release of Radioactive Material The NAC-1 cask is designed to assure no radioactive material release as a result of any condition of normal transport.
In the structural evaluation of the containment vessel, Section 2.6 the containment is demonstrated to survive the specified conditions of impact, temperature, and pressure for normal conditions of transport.
4.2.2 Pressurization of Containment Vessel l
t There are no pressurized gases in a metallic fuel assembly, thus there is no l
increase in the cavity pressure if the assemblies rupture.
The analysis of i
4-6 Revised September,1987 A
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i CLOSURE LID UPPER IMPACT LIMITER LID SEALS STRUCTURE l
1 0.375 x 45' Chamfer (cptional)
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0-RING CHECK VALVE Revised September 1987 4,7 L-
OVERSIZE DOCUMENT PAGE PULLED SEE APERTURE CARDS NUMBER OF OVERSIZE PAGES FILMED' ON APERTURE CARDS APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH,TIDC' FTS 492-8989
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