ML20211G295
| ML20211G295 | |
| Person / Time | |
|---|---|
| Site: | 07106206 |
| Issue date: | 09/22/1986 |
| From: | Watters J BABCOCK & WILCOX CO. |
| To: | |
| References | |
| 27447, NUDOCS 8611030364 | |
| Download: ML20211G295 (5) | |
Text
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Babcock & Wilc M CE, M e m
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P.O. Box 11646 a McDermott company DOC M Lynchburg, VA 24506-1646 4'
usNRQ (804) 522-6000 SEP M N September 22, 1986
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RECEIVED 1
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G Mr. C.
E. MacDonald, Chief t
Transportation Branch ji N$gjtAronyf;/
Division of Fuel Cycle and Material Safety un
/s United States Nuclear Regulatory Commission 4
"* M Washington, D. C.
20555 4 gg*
REFERENCES:
(1)
Certificate of Compliance, USA /6206/AF, Babcock &
Wilcox "Model B", Docket 71-6206, Expiration Date May 31, 1990 (2)
SNM-ll68, Docket 70-1201 Gentlemen:
.The Babcock & Wil'cox Company, Commercial Nuclea,r' Fuel Plant requests amendment of Certificate of Compliance 6206 (Model B Fresh Euel Shipping Container) to allow shipment of selected fuel assemblies 1
with its matching control rod assemblies inserted in the control rod guide tubes.
Additionally, some other minor changes for clarification purposes are requested in Drawing PE-53F.
Attachment I to this letter gives detail and appropriate justification on this requested amendment for the Model B container.
Our review of the Shipping Safety Analysis for the Model B indicates no revisions are necessary to accommodate this change.
The only hardware modification necessary involves a change to a spacer assembly that is shown on Drawing PE-53F, Revision 2.
The other minor dimensional changes that are requested pertain to the spacer drawings on PE-53F.
These changes allow a greater flexibility to the spacer design which is needed to accommodate the possibility of shipping other similar fuel assemblies (without control rod assemblies) in the Model B container that require spacers due to the fuel assembly length.
The conditions regarding packaging, contents, hold down force, etc., will continue to be maintained for use of the Model B container regardless of the fuel assembly type shipped.
Seven (7) copies of PE-53F, Revision 2 are included with this letter for your review.
Enclosed is a check for $150.00 to cover the initial application fee.
8611030364 860922
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DR ADOCK 0710 6
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United States Nuclear Regulatory Commission Page 2 September 22, 1986 We appreciate your consideration in this matter.
Should you wish to discuss this material in more detail, or if questions should arise, please do not hesitate to contact me at (804) 522-6202.
Sincerely, BABCOCK & WILCOX COMPANY COMMERCIAL NUCLEAR FUEL PLANT
.k. O J. P. Watters License & Control Administrator JPW:cmr
'5 cc:
D. W.
Zeff J. C. Frost Attachments L
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ATTACHMENT I Presently,.the Model B Fresh Fuel Shipping Container is authorized to ship several fuel assembly designs of varying lengths.
The Conn Yankee fuel assembly design requires a spacer as shown in Drawing PE-53F to insure a firm fit between the container End Gates and fuel assembly End Fittings.
This spacer helps to restrain the fuel assembly and inhibits motion along the length of the fuel assembly.
Additional holding force is provided by the clamp bows which supplies vertical and horizontal pressure on the fuel assembly while in the Model B container.
This request to allow the use of the Model B container for shipment of control rods inserted in the fuel assembly applies only to the Conn Yankee design fuel assemblies previously mentioned.
The following factors were considered regarding the proposal to ship the control rods inserted in the Conn Yankee fuel assembly:
1 - nuclear safety 2 - radiological safety 3 - effect on original safety analysis a-container modifications b - weight of contents c - hold down forces applied on the fuel assembly and control rod 1 - Nuclear Safety Although a formal nuclear safety analysis was not performed, it is consistent to say this proposed change is conservative in regard to the nuclear safety aspects.
An extra neutron poison would be introduced for each Conn Yankee fuel assembly shipped, therefore the overall Keff should not be adversely affected.
2-Radiological Safety Shipping Conn Yankee fuel assemblies with the control rods should not have an adverse affect on the overall radiological safety of the Model B container.
The UO, is still sealed in the fuel rods and the control rod assembly would be held rigidly
2 - Radiological Safety in place by the adjustment screw shown on the spacer (Part 86 and 87 on PE-53F).
The control rod is inserted inside separate guide tubes and will not be in direct contact with fuel cladding.
3-The Shipping Safety Analysis for the Model B container was reviewed to determine if this change would have any affect on the results of the prototype tests.
The following conclusions were made regarding this review.
A - The present as-approved design of the Model B will remain unchanged.
The approved spacer shown on PE-53F, Revision 2 has however been changed to allow the use of an adjusting screw which will assure adequate pressure is maintained on the fuel assembly and control rod.
This adjusting screw is similar in design and operation to that currently used on the top and bottom end gates.
Therefore the Model B container with the spacer modification is still not significantly different from the as-tested configuration.
B - The maximum gross weight of a loaded Model B container as indicated in the Shipping Safety Analysis (Section 1.1.1) is 7300 lbs.
The gross weight of a Model B container loaded with 2 Conn Yankee assemblies and control rod assemblies is broken down as follows:
2 Conn Yankee fuel assemblies 2510 lbs.
2 control rod assemblies (140 lbs. each) 280 lbs.
=
Model B container empty (with spacers) 4360 lbs.
Total loaded gross weight 7150 lbs.
Even with the additional 280 pounds from the two control rod assemblies the total weight is still approximately 150 pounds under the maximum allowable weight.
The increased weight therefore should not have an adverse affect on the container performance or on the original test results.
C-The hold down forces on the Conn Yankee assembly should not be compromised by the addition of the control rod assembly.
The modified spacer assembly with the adjustable screw clamp combined with the screw clamps on the top and bottom end gates assures that the proper hold down forces on the assembly ends will be maintained.
The clamp bow / hold down pad arrangement will be maintained to assure the ratio of assembly and control rod weight to the number of clamp bows will not exceed 168 lbs. as stated in Condition Number 7 of the Certificate of Compliance.
Based on the factors and justification in this application, we request that the Model B Fresh Fuel Shipping Container (USA /6206/AF) be approved for shipment of Conn Yankee design fuel assemblies with or without the control rod component inserted in the fuel assembly guide tubes provided the appropriate spacer assembly as described in PE-53F is utilized.
Additionally, we request that the other dimensional changes shown for the fuel assembly spacers on PE-53F be approved to permit the shipment of different length fuel assemblies without the control rod component.
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APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVN:E5 BRANCH,TIDC FTS 492-8989 i
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