ML19345C466
| ML19345C466 | |
| Person / Time | |
|---|---|
| Site: | 07106400 |
| Issue date: | 10/14/1980 |
| From: | Baer T U.S. ECOLOGY, INC. (FORMERLY NUCLEAR ENGINEERING |
| To: | Mcdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 17643, NUDOCS 8012050079 | |
| Download: ML19345C466 (27) | |
Text
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[Ok 7/-4,y64 g.4 Nuclear Engineerin#, Company Inc.
ih, s2co sHcLavvitLE acAo. suitt s2e P.o. Box 7246 Lout SVILLE. M E NTUCKY do2o7 PHONE 85o2) 426-716o ik
.m October 14, 1980 3
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- <;ca Charles E. MacDonald, Chief
.%g Transportation Certification Branch
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, 2"3 Division of Fuel Cycle in Material Safety Vrig U.S. Nuclear Regulatory Commission
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- 5 Washington, DC 20055
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'g Docket 71-6400 SUPERTIGER Shipping Package
~
Dear Mr. MacDonald:
This letter will provide an update on the status of Nuclear Engi-neering Company's two SUPERTIGER shipping packages, Certificate of Compliance No. 6400.
Both shipping packages were inspected in accordance with Certificate of Compliance No. 6400, Revision No. 8, transmittal letter dated February 29, 1980.
The findings of these inspections and photographs of the units are contained in the attached inspection report.
As a result of these initial inspections, a radioactive material shipping package designer and manufacturer was contracted to assist in con-ducting additional inspections and correction of deficiencies.
The initial inspections revealed that both units have convex and concave bulges in the internal cavity panels which are greater than that allowed by PPI Drawing 32106, Revision F.
However, additional inspections have revealed that the bulges are not a result of fatigue or separation of the metal wall from the interior foam.
These in-spections show that the inner foam is properly adhering to the inner and outer walls and that the bulging is a static condition.
Repairs and refurbishing of these units are planned to address areas reported in the attached inspection report.
These tasks are cate-gorized into five basic areas as follows:
'1)
Exterior Door - Re-design the hinge system, taking into con-sideration such items as door weight dynamics and fatigue.
The existing hinges would be removed, new hinges fabricated and installed.
In addition, the area adjacent to the hinges would be reworked as required to put them in the original condition.
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176 g 8012050079 l
Charles E. MacDonald Page 2 of 2 October 14, 1980 2)
Inside Door - Re-design the interior door as required to meet current pressure requirements.
A new door would be fabricated and installed.
3)
Inside containment vessel - Modify the inside containment ves-sol to provide a metal-to-metal stop.
A new angle, complete with a containment vessel extension, would be welded, and the foam reinstalled.
This area, in turn, would be sealed off by way of a new closure plate.
4)
Interior - The interior of the containment vessel will be sand-blasted and all welds magnetic particle inspected.
If defec-tive welds are found, they will be repaired.
5)
Exterior - The package exterior will be sandblasted, painted, and new gaskets installed on the doors.
Tests would be run to establish the acceptability of the gasketing systems.
The aforementioned tasks are scheduled to commence as soon as pos-sible.
However, it is important that any additional concerns of the USNRC Transportation Certification Branch in this matter be addressed prior to offering the SUPERTIGER shipping packages for repairs.
Your earliest response with comments and concurrence on the proposed re-pairs would be appreciated.
Sincerely, NUCLEAR ENGINEERING COMPANY, INC.
/'
T. S. Baer Vice President TSB/bt
Enclosures:
2 Inspection Reports,. dated 9/17 and 9/24, from Nuclear Packaging, Inc.
SUPERTIGER Inspection Reports of June 2 and 3 (NECO)
Operational Procedure for Inspection of Interior of DOT Specification Container 6400 (Procedure No.
G-103.1)
. v-l 1 21
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NUCLEAR uPb PACKAGING, INC.
815 SO. 28TH STREET
- TACOMA. WASHINGTON 98409 + (206) 572 7775 8381243 September 17, 1980 Mr. W. M. Hipsher o
Chief Radiological Control and Safety Officer Nuclear Engineering Company, Inc.
P. O. Box 7246 Louisville, Kentucky 40207 Reference 1:
Super Tiger Type B Container Inspection Report, Unit 1 June 3, 1980, Unit 2 June 2, 1980.
Reference 2:
Internal Procedure for Inspection of Interior of D.O.T. Specification Container
~~
6400 and Super Tiger Inspection data August 28, 1980.
Dear Mr. Hipsher:
Per your request, I have reviewed the referenced reports and inspected both packages.
Two inspection trips have been completed.
The first was intended to provide an overview of the packages, while the second was used primarily to review the inspection holes cut in the package skins.
The following represents a summary of findings and lists deviation in addition to those recorded in Reference 1.
A.
Both internal and external doors are hinged.
Installation of the external door hinges has reduced the structural integrity of the closure channel system.
Redesign and refabrication of the hinge area is required.
Internal door hinges on Unit No.1 are attached by means of bolts through the door.
These bolts represent penetrations for potertial leaks.
Since they are steel bolts through aluminum plate, we ding is not possible.
The hinge system should be redesigned and the lid modified to place the hinge attachment outside the containment boundary (i.e., similar to Unit #2).
4 h ~ A metal to metal stoo is no longer present between the containment vessel shell and the aluminum internal door.
This stop is necessary in order to assure that the gasket will not l
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Mr. W. M. Hipch r Nuclocr Enginscring Comptny, Inc.
September 17, 1980 Page 2 be overcompressed.
You will note that the drawing calls for the internal skin to extend beyond the closure angle.
This condition exists on both packages and will require modification.
E As noted in Reference 1, internal pad eyes are present in Unit 1.
These pad eyes, as well as the internal welds, should be inspected for cracks and potential leaks.
D.
As noted in Reference 2, the foam remains bonded to the steel in all areas examined.
It would appear that most of the warpage or skin distortions were thore at the time of manufacture and foaming.
Some local distortions in the inside floor may have been caused by loading of heavy casks.
These concentrated loads may have actually compressed the foam locally.
At any rate, adhesion is present, thereby assuring the " stress-skin" integrity referenced in the S.A.R.
We would be happy to discuss these fir angs with you in detail and make recommendations toward gettis.g the packages back into service.
Sincerely yours, NUCLEAR ACKA NC, INC.
Lppy /s d Larry J.
ansen LJH/ pro 2
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NUCLEAR uPdc PACKAGING, INC.
815 SO. 28tH STREET + TACOMA, WASHINGTON 98409 + (206) 572 7775 + 8381243 li:.s s.'
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September 24, 1980 Mr. Tom Baer Nuclear Engineering Company, Inc.
P.
O. Box 7246 Louisville, Kentucky 40207
Dear Tom:
Per your request, I have prepared an estimate of the costs to repair one of the existing Super Tigers.
It is assumed that the following tasks would be required ta aa=Ne the package suitable for use again.
Task #1 - Exterior Door We would propose to re-design the hinge system, taking into consideration such items as door weight dynamics and fatigue.
The existing hinges would be removed, new hinges fabricated, and installed.
In addition, the area adjacent to the hinges would be reworked as required to put them in the original condition.
Task #2 - Inside Door We would propose re-designing the interior door as required to meet current pressure requirements.
A new door would be fabricated and installed.
Task #3 - Inside containment vessel It is necessary that the inside containment vessel need be modified to provide the metal to metal stop mentioned in previous correspondence.
A new angle, complete with a containment vessel extension, would be welded, and the foam reinstalled.
This area, in turn, would be sealed off by way of a new closure plate.
Task #4 I
The interior of the containment vessel would be sand-blasted and all welds magnetic particle inspected.
Defective welds would then be repaired.
Task 45 i
The total package would be sandblasted, painted and new gaskets installed.
Tests would be run to establish the acceptability of the gasketing systems.
i
Mr.
Tom Baer Nuclear Engineering Company, Inc.
September 24, 1980 Page 2 We would estimate the cost to perform the above noted tasks would be approximately $
This estimate does not include contingency for any additional defects that may be found during the repairing process.
Should you require additional information or detail of the above noted items, please feel free to call.
Yours truly,
.cs NUCLEAR CKAGING, INC.
//
,; & :l Larry Hansen LJH/ pro i
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SUPER TIGER TYPE B CONTAINER INSPECTION REPORT Certificate of Compliance 4 6400 Inspection Dates:
Unit il - June 3, 1980 Unit #2 - June 2, 1980 In accordance with the USNRC's transmittal letter for Certificate of Compliance No. 6400, Rev. No. 8, inspection of the Super Tigers was performed on June 2 and 3, 1980.
The results of these inspec-tions are below:
I.
On June 2, 1980, an inspection of one of NECO's SUPERTIGERS was conducted at Babcock and Wilcox in Lynchburg.
It is as-suMed that this is the newer unit, so for serialization pur-poses it is designated Unit #2.
A.
Exterior Condition s
A deep dark blue paint provides good coverage on this unit.
In some places, the adhesive from DOT signs placed on the unit have removed some of the paint.
However, two coats of a lighter blue paint remain and provide rust protection.
Some small 1/2-inch diameter bubbles are present and there is very little exterior rust.
Some rust is present in areas where scratches have penetrated all three paint layers and around the bolt opening and the seam where the outer lid and con-tainer meet.
The name plate is on the lower corner next to the bolt openings on the non-hinged side of the unit.
This name plate offers no identification other than the designer, manufacturer and that it is the 6400 container.
The name plate is riveted to the package by four large head rivets (approximately 1/2" diameter head).
One rivet ir missing.
The large outer door has 10 or more small indentations on the exterior surface.
These indentations are not recent and are approximately 2/10-inch deep and 1-inch in diameter.
B.
Interior Condition The interior of this unit is painted white and reveals any rust readily.
Abrasions due to the primary con-tainers transported in the Super Tiger have caused re-moval of paint and some rust.
Waviness of the interior deck and bulkheads is readily visible.
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File - 6400 (Super Tiger)
June 9, 1980 (Rev. 7/21/80)
Page 2 C.
General Construction Condition No holes or cracks exist in the unit other than designed vents which are closed.
Visual inspection of welds revealed no cracking.
D.
Outer and Inner Door Condition Bolts, bolt holes and threads are in good condition.
They do, however, have some surface rust.
When fac-ing the door end of the unit, both doors are hinged on the right side.
Hinges are in good condition.
The outer door has four hinges each with a zerk fit-ting.
The drawings indidate that two hinges are present but do not specify that two are required or that zerk fittings are required.
E.
Gasket and Seatina Surface Condition Two gaskets, one on each door, were found to be de-ficient.
The gasket attached to the outer door was not of uniform width and had gaps where the gasket was butted, one of which measured 4/30 of an inch.
In addition, some paint was present on the gasket.
The seating surface for the gasket was not properly maintained in that it had various layers of paint and some rust and did not seal.
The inner door gasket was new but needs to be reattached to the door.
There were approximately 10 locations where the gasket had separated from the door, mostly lo-cated around the bolt holes.
The seating surface is also in need of proper preparation.
F.
Dimensional, Tolerance and Material Inspection All dimensions are within tolerance with exception of the waviness in the bulkhead and the distance between bolt holes in the outer door.
The measured de"i=tien from peak to valley is 20/30-inch on each of th: bulxneads (within 3/16-inch is allowable).
The distance measured between outer door bolt holes, centerline to centerline was 23 inches (allowable 22-1/2 1 1/8).
The rivets on the name plate were different than the second unit inspected.
(See attached drawing.)
l l
l
b File - 6400 (Super Tiger)
June 9, 1980 (Rev. 7/21/80)
Page 3 G.
Corrective Actions Required i
1.
Paint Coverage - No action required other than routine painting when required.
2.
Rust - No immediate action required.
Rust areas should be properly prepared and repainted at the earliest opportunity (exterior and interior).
3.
.Name Plate - Replace missing rivet.
4.
Outer Door Indentations - No action required.
5.
Inner Cavity Panel Flatness - The waviness of the internal bulkheads must be evaluated to ascertain any impact on the engineering evaluation which determined the Super Tiger's suitability for use in the shipment of radioactive material.
6.
Gaskets and Seating Surfaces - Gaskets are to be sized properly and be uniform in width without any gaps where pieces are butted together.
The gasket must remain fixed to the metal to which it is ceremed.
The seating surfaces must be prepared such that the number of paint layers is uniform.
One layer of zine chromate primer and enamel paint is recom-mended to provide rust protection and avoid uneven surfaces.
All seating surfaces shall be clean and smooth prior to painting.
After proper preparation of the gasket and seating surface, a chalk test shall be performed to insure that the seating sur-face and the gasket surface are not warped.
7.
Dimensional Distance Between Outer Door Bolt Holes -
The attached drawing indicates that various measure-ments associated with the distance between outer door bolt holes deviate from the tolerances allowed by Super Tiger Drawings 32106 F and 32106 Sheet 2.
This deviation has to be evaluated to ascertain how it impacts the engineering evaluation which determined the Super Tiger's suitability for use in the shipment of large quantities of radioactive material.
H.
Pictures Taken 1.
Name Plate 2.
Outer door indentations 3.
Outer door indentations 4.
Hinge with zerk fitting 5.
Hinge with zerk fitting 6.
Water in container 7.
File - 6400 (Super Tiger)
June 9, 1980 (Rev. 7/21/80)
Page 4 j
8.
Gasket 9.
Seating surface 10.
Seating surface 11.
Unit exterior condition II.
On 3 June 1980, the second NECO SUPERTIGER was inspected at Neutron Products in Dickerson, Maryland.
This unit is desig-nated as Unit #1.
A.
Exterior Condition Unit il appears to be an older unit from both exterior and interior observations.
This unit is painted blue but somewhat lighter than Unit #2.
The paint coverage is generally better than Unit #2 with much less visible surface rust.
Only two spots had surface rust and these were on the nonhinged side lower corner.
These areas measure 6"x4" and 5"x4".
This unit has many oxi-i dized areas as indicated by subsurface (under the l
paint) flaking -snd bubble formation.
The name plate differs from Unit #2 in the type of rivets used to attach it to the Super Tiger.
In addi-tion, above the name plate and on the opposite exterior side raised letters are present
(" Protective Pcckaging, Inc." and logo).
B.
Interior Condition The interior is painted white and shows rust in places that the primary containers have rubbed against the bulkhead.
The amount of rust in this unit indicates that it has not been painted recently.
The waviness of the bulkheads is readily visible.
The inside of this unit has 4 bolted-down pad eyes, one in each corner.
Unit #2 does not have such hardware installed.
C.
General Construction Condition No holes or cracks were found on any surfaces or welds I
other than designed holes for bolts and vents.
D.
Outer and Inner Door Condition t
l Bolts, bolt holes and threads are in good condition.
They do, however, have some surface fust.
When facing the door end of the unit, both doors are hinged on the left side which is different from Unit 42.
The outer door has two hinges without zerk fittings.
The hinges i
are of a different design than the Unit #2 hinges.
The inner door appears to be warped at the bottom horizontal gasket surface closest to the hinges.
^
~
~
File - 6400 (Super Tiger)
June 9, 1980 (Rev. 7/21/30)
Page 5 E.
Gasket and Seating Surface Condition The inner door gasket is new but is not installed properly.
It has separated from the metal where not properly cemented and gaps exist where pieces are butted (5/30-inch).
In addition, the gasket is installed only on 3 of the 4 sides.
Due to the warped inner door and the floor waviness causing the seating surface to be wavy, it is doubtful if a proper seal can be accomplished.
The seating sur-face for the inner door is not properly maintained and must be cleaned and repainted.
The outer door gasket is non-existent; however, there is evidence that one was installed prior to the last complete i
painting.
The seating surface for the missing gasket is in disrepair.
F.
Dimensional, Tolerance and Material Condition All dimensions are within tolerances with exception of the 'saviness of the interior deck and bulkheads (1-inch walls, 1/2-inch on deck allowable 3/16-inch).
G.
Corrective Actions Required 1.
Paint Coverage - The interior should be prepared and painted at the earliest opportunity.
The exterior has sufficient paint coverage but will require re-painting when the rust problems are solved.
2.
Rust - The two rusty patches and subsurface rust must be rectified at the earliest opportunity.
Then a complete painting is recommended.
3.
Inner Cavity Panel Flatness - The waviness of the internal bulkheads must be evaluated to ascertain any impact on the engineering evaluation which determined the Super Tiger's suitability for use in the shipment of radioactive material.
4.
Gaskets and Seating Surfaces - All gaskets and seating surfaces must be properly prepared and tested.
The proper seating of the inner door is additionally dependent on correcting the warped inner door.
S.
Warped Inner Door - The warped condition of the inner door must be corrected prior to use.
l a
File - 6400 (Super Tiger)
June 9, 1980 (Rev. 7/21/80)
Page 6 l
H.
Pictures Taken d
1.
Rust areas 2.
Sub-surface rust 3.
Sub-surface rust 4.
Name plate 5.
Raised lettering 6.
Door interior 7.
Hinges 8.
Floor Waviness 9.
Warped inner door and gasket III.
General Condition Comments A.
No specific number of hinges is indicated on the drawing, but the unit is depicted with two hinges.
We have one unit with 4 hinges and zerk fittings.
B.
Zerk fittings are not shown on drawinas.
IV.
Differences Between the Two NECO-Owned Units A.
Name Plate Location - Unit #1: as facing the open unit, the name plate is on the right side, lower corner near the door opening (opposite of the hinges).
Unit #2:
on left side, lower corner near door opening (opposite of the hinges).
B.
Name Plate Rivets - Unit fl: much smaller rivets are used in the order of 1/4 inch diameter.
Unit
- 2: rivets are larger, approximately 1/2 inch diameter.
C.
Other Exterior Identification - Unit #1 has the in-scription " Protective Packaging, Inc." above the name plate and in the same relative position on the opposite side.
Unit #2 has no such relief lettering.
D.
Hinges - Outer Door (as looking at the Units from the doorend of the hinges) - Unit #1: 2 hinges with-out zerk fittings are on the left side.
Unit #2:
4 hinges with zerk fittings are on the right side.
4 E.
Interior Pad Eyes - Unit #1: Four bolted pad eyes l
are present, cne in each corner.
None are present in Unit #2.
F.
Exterior Color - Unit #1 is a lighter blue than Unit $2.
This of course may change as the units are painted in the future.
WMH/bt
SUPER TIGER UNIT 82 - BOLT HOLE MEASUREMENTS As indicated in the referenced meno the dimensions between bolt hole center lines were not for the drawing for Unit #2.
This unit has arrived at Richland Washington and my inspec-tion results concerning this particular dimension were checked with the'following results.
f!
,[ distance top bolt hole C to top 1 3/4" drawing 3" 1 1/8 g
d '
distance between bolt hole C to C 23" drawing 22
+ 1/8 d
distance between bolt hole C to C 23" drawing 22
-+ 1/8 L
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u t l distance between bolt hole C to C 23" drawing 22 1 1/8 T
distance between bolt hole C to C 19" drawing 22 1 1/6 w
. Y distance C of bolt hole to the bottom edge 6" drawing 1
t 3" + 1/8 11
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Radiological Control Work Procedure
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OPERATIONAL PROCEDURE FOR INSPECTION OF INTERIOR
Subject:
OF D.O.T. SPECIFICATION CONTAINER 6400 Procedure No.
G-103.1 Tachnical Concurrence:
/
Sh-7<4e Page 1
of 3
Approval Authorization:
Rev.
0
' '/
Date 8/80
1.0 INTRODUCTION
The purpose of this procedure is to ascertain if the polyure-thane foam insulation in the wall cavity of the SUPERTIGER has separated fr m the inner walls and if moisture has been present to cause rusting to take place.
2.0 DISCUSSION This procedure has been developed from the Certificate of Com-pliance for the 6400 specification container.
3.O ADMINISTRATIVE REQUIREMENTS The Site Manager is responsible for the implementation and maintenance of the operational inspection procedures and records.
4.0 OPERATIC.lAL PROCEDURES 4.1 Equipment Required 1 - Carpenter's level 1 - Bosch Grinder or equivalent 4 - High-speed, abrasive discs 4.2 Procedure 4.2.1 Using.the Carpenter's Level 4.2.1.1 Ascertain the area of largest deformation.
4.2.1.2 Ascertain the degree of deformation.
4.2.2 Inspect the area to be cut f,r any signs of loose or fixed contamination.
If clean, proceed with 4.2.3; if not, decontaminate the area to an acceptable level.
I 1
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PROCEDURE NO.
G-103.1 REVISION O
PAGE Z
OF 3
4.2.3 Using the Bosch Grinder with high speed, abrasive discs, or equivalent, cut approximately a four-inch square section in the 3/16" steel of the deformation area.
If this cutting is being done on the exterior of the SUPERTIGER, one 1/8" or two 1/8" steel breakaway plates may be encountered and also have to be cut through using the Bosch Grinder.
4.2.4 Withdraw the section which has been cut from the wall of the container and set aside for replacement at a later date.
4.2.5 Cover each opening with at least one layer of heavy duty plastic and secure it in place.
Over this, attach and secure a 1/4" layer of plywood, or equiv-alent, to prevent the plastic from being punctured.
5.0 INSPECTION PROCEDURES 5.1 If visible, inspect for separation of steel breakaway plates from outer wall.
5.2 Inspect for separation of polyurethane foam insulation from inner walls.
5.3 Inspect for rust or evidence of moisture in inner wall cavity.
5.4 Obtain a picture of the hole and the inner wall of the removed section for later reference.
6.0 INSPECTION RESULTS 6.1 Report findings of the inspection to Corporate Headquarters for their use in determining if any further inspections are necessary, if a repair is necessitated, or that everything is satisfactory.
6.2 Complete Quality Assurance Manual, Form 01-108, Nonconformity Material Disposition Report, documenting both the inspection and the nonconformances found.
6.3 Once repairs or inspections are complete, replace the cut-out piece of wall.
The welding rod used shall be of the same type of material as the walls and the welding'shall be done by a certified welder.
The surface shall then be re-paired to be flush with the rest of the wall by removing excess weld.
The area shall be cleaned of residual paint
~and repainted to match the rest of the container.
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PROCEDURE NO.
'G-103.1 REVISION n
PAGE 3
OF
.3 6.4 Perform a container inspection per the NECO QA Manual.
Document everything done to the container, including the control numbers for any material used, and the name and certification number of the-welder.
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INTER COMPANY I
MEMORANDUM To: Floyd Dickson DATE: August 28, 1980 FROM: Becky Cropper g' d (
REF:
SULJECT: Super Tiger Inspection cc: WMH REP VDA RBR A.
SUPER TIGER fl I.
Exterior Wall A defomation of 3/4" was found on the exterior wall of SuperTiger #1. Te steel breakaway plate became visible after cutting out an approximate 3 square inch hole in the exterior wall of the Super Tiger. There was some evidence of superficial rusting.
It was obvious that the oloyurethane foam was bonded to the exterior wall very well. The steel breakaway plate was parallel and in contact with the exterior wall.
After the steel breakaway plate section was removed, it could easily be seen that the foam was bonded well to it. There was no evidence of rusting between the foam and the steel breakaway plate.
II.
Interior Wall The inner wall was found to have a lh" deformation. This section was removed and it could be easily seen that the steel plate was fimly bonded to the foam.
III.
Floor Two holes were cut into the floor of the Super Tiger. One was cut into a section of flocr where there was a 3/4" warp outward, and the other was cut into a section of floor where there was a 3/4" inward warp. After both df these sections were removed, the inspection showed that there was no indication of rust on either one and that the foam was fimly bonded to the steel floor.
B.
SUPER TIGER #2 I.
Exterior Wall i
The maximum defomation found on the exterior wall was 3/4".
Upon cutting an approximate 3 square inch section in the exterior of the Super Tiger and then removing it, the l
steel breakaway plate became visible. There was evidence l
that moisture had been present between the breakaway plate i
and the exterior wall as there was a light, spotty, nor-l flakeylayer of rust visible. There is a " space between j
l romu ne unco
.o Memo to Floyd Dickson August 28, 1980 Page 2 the breakaway plate and the exterior wall.
The steel breakaway plate section was removed next.
It was very obvious after its removal that the polyurethane foam insulation was bonded quite well to the breakaway plate.
II.
Interior Wall A deformation of 3/4" was found on the interior wall of the Super Tiaer. We removed a three souare inch section from the wall in this area. Upon removal of this section, it became evident that the foam insulation was bonded to J
the interior wall. An insignificant amount of rust was observed.
III.
Floor The area of largest deformation in the floor of the Suoer Tiger #2 was found to be 3/4". A three square inch section of this part of the floor was removed and it was discovered that the foam was definately bonded to the inner side of the steel floor covering. No rust was visible.
C.
CONCLUSION Suoer Tiger #1, while being more warped than Super Tiger #2, appears to be in the better condition of the two. Super Tiger #2 has been found to have a h" gap between the breakaway olate and steel exterior wall.
In both Suoer Tigers, some superficial, non-flaking rust was discovered between the exterior wall and the steel breakaway plate.
In all cases, the foam appeared to be firmly bonded to the steel walls. See attachments.
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