ML22039A132
| ML22039A132 | |
| Person / Time | |
|---|---|
| Site: | 07103037 |
| Issue date: | 10/24/2013 |
| From: | Bergmann W DAHER-NCS |
| To: | Office of Nuclear Material Safety and Safeguards |
| Bernie White NMSS/DFM/STL 301-415-6577 | |
| Shared Package | |
| ML22039A116 | List: |
| References | |
| Download: ML22039A132 (14) | |
Text
Publisher: Department AT Inspection Instruction No.: PA-03-04 Inspections of the BU-D Package within the Scope of Maintenance, of Regular and Periodic Inspections Contents
- 1. Object and field of application
- 2. Scope and date of inspections
- 3. Qualification of the inspection personnel
- 4. Documents
- 5. Conditions of visibility
- 6. Inspection performance, assessment and evaluation 6.1 Visual inspections 6.2 Wall thickness measurement 6.3 Inspection of threads with gauge ring and plug
- 7. Special information for repair measures 7.1 Repair of paint damages 7.2 Removal of corrosion at the insulating disc 7.3 Repair of the thermal insulation 7.4 Cleaning of the thread holes of the hexagon nuts of the inner container
- 8. Documentation : Inspection criteria : Sample template for the repair of the light concrete surface Rev.- Revision Prepared/ Checked/ Release NCS/ Release BAM/
No. Date Date Date Date 1 Chapter 7 and W. Bergmann T. Breuer F. Hilbert C. Kuschke Attachment 2 14.10.2013 14.10.2013 14.10.2013 24.10.2013 new
Inspection Instruction No. PA-03-04 Rev. 1 Page 2 of 6
- 1. Object and field of application The object of these inspection instructions is to determine the conditions for the in-spection of transport casks of type BU-D within the scope of maintenance and period-ic inspections. Furthermore the instruction contains requirements for repair measures.
- 2. Scope and date of inspections Scope and date of inspections are defined in the higher ranking instruction.
- 3. Qualification of the inspection personnel Personnel carrying out inspections must be familiar with the inspection instructions and the drawings of the transport cask and must be capable of carrying out visual in-spections.
Furthermore, the requirements put forward in the higher ranking instruction are valid.
- 4. Documents The drawings and parts list belonging to the cask have to be available for the regular and periodic inspections. During the maintenance within the scope of handling these have to be taken into regard for the evaluation of unacceptable inspection results.
- 5. Conditions of visibility Good illumination must prevail at the inspection site at the time of inspections, e.g.
daylight or artificial light of 500 Lux at least (this corresponds to lighting conditions 1 m from an 80 W fluorescent lamp). Disturbing light influences, e.g. reflections, are not allowed.
- 6. Inspection performance, assessment and evaluation 6.1 Visual inspections The various components of the transport cask are submitted to visual inspection covering:
x Cleanliness x Condition of the paint x Surface conditions x Irregularities and damages x Corrosion x Completeness The criteria for visual inspections are found in the drawings and parts lists as well as in the instructions in Attachment 1 to these instructions.
If any dents are found during the visual inspection, which apparently are within the admissible scope of error, they shall be measured with a steel ruler and a slide gauge.
6.2 Wall thickness measurement Wall thickness shall be checked randomly on 5 % of the transport casks to be in-spected, using an adequate ultrasound wall thickness measuring unit.
Inspection Instruction No. PA-03-04 Rev. 1 Page 3 of 6 Three points each on the exterior package and on the interior package shall be de-termined randomly. The allowable deviations of the wall thickness are specified in At-tachment 1.
6.3 Inspection of threads with gauge ring and plug The threads are inspected for:
x Cleanliness x Mechanical damages x Dimensional accuracy of the threads The criteria for the inspections have to be taken from DIN ISO 1502, the instructions in Attachment I and the instructions of the higher ranking instruction.
- 7. Special information for repair measures 7.1 Repair of paint damages For the repair of paint damages at the outer and inner container respectively for new painting only paints may be used for which a certificate according to DIN 25415 or ISO 8690 exists which certifies at least good decontamination properties.
The information of the manufacturer has to be observed during painting.
7.2 Removal of corrosion at the insulating disc If corrosions are detected at the zinc-coated plates of the insulating disc these have to be removed for example by sandpapering. After this the insulating disc has to be painted with a primer coat if necessary.
7.3 Repair of the thermal insulation If cracks or spalling at the surface of the thermal insulation between inner and outer container are detected these have to be repaired.
For this the concrete at the affected area is largely removed and repaired by applying new light concrete at the surface. To get an even, smooth surface it is recommended to use a template according to Attachment 2.
When mixing the light concrete as far as possible the composition of perlite, cement and water according to material data sheet WB-02-04 has to be observed. The use of tylose and air-entraining agent is not necessary because these are only necessary for the better pouring of the complete container but not for surface repair.
After the repair of the light concrete surface it has to dry at least for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. After this the surface has to be sealed with decontamination paint.
7.4 Cleaning of the thread holes of the hexagon nuts of the inner container The threads of the hexagon nuts of the inner container can get dirty with residues of the light concrete. These residues have to be removed especially for the gauge test.
To prevent a damage of the threads during the cleaning this should be done as con-serving as possible by brushing and exhausting of the residues. In the case of bond-
Inspection Instruction No. PA-03-04 Rev. 1 Page 4 of 6 ed adhesions the thread should be cleaned manually with a die. It has to be paid at-tention to the correct positioning of the die.
- 8. Documentation The results of inspections shall be recorded when this is required in the higher rank-ing instructions. If overhauling tasks are required (with exception of cleaning works),
they also have to be documented.
Inspection Instruction No. PA-03-04 Rev. 1 Page 5 of 6 : Inspection criteria
Inspection criteria PA-Nr. PA-03-04 Page 1 of 7 Inspection instructions: PA-03-04, Rev. 1 Component: Package identification Part Inspection for: Unacceptable are: Measures in case of non-conformities Package identification Legibility Illegible signs Restore readability by painting Completeness Missing signs Correct signs with stencil Conformance with Deviations Correct package marking package log book with stencil Rev. No. Revision Prepared/Date Checked/Date Release NCS/ Release BAM/
Date Date 0 Original W. Bergmann/ F. Hilbert/ M. Kübel/ T. Nitz 11.04.2003 14.04.2003 15.04.2003 05.02.2004 1 PA-03-04 W. Bergmann T. Breuer F. Hilbert C. Kuschke Rev. 1 14.10.2013 14.10.2013 14.10.2013 24.10.2013
Inspection criteria PA-Nr. PA-03-04 Page 2 of 7 Inspection instructions: PA-03-04, Rev. 1 Component: Outer container Part Inspection for: Unacceptable are: Measures in case of non-conformities Basic body (outer Surface conditions Maintenance Cleaning surface and accessible Dirt, if it can impair the inner surface) function of the package Regular and periodic inspections Dirt Maintenance Repair painting Damaged paint (cracks, flaking) with an extension greater than 1 cm2 Regular and periodic inspections Damaged paint (cracks, flaking)
Maintenance Derust, repair painting Signs of corrosion with an In case of significant extension greater than 2 material abrasion perform 1 cm a wall thickness Regular and periodic measurement and record Inspections in the package log book; Signs of corrosion If the measured wall thickness is more than 25 % below the requirements of the drawings the cask has to be separated resp. repair measures have to be agreed with BAM Mechanical damages Holes and cracks, dents Separate cask resp. agree with a depth greater with BAM on repair 30 mm, sharp edges measures Wall thickness Wall thickness is below Separate cask resp. agree 25 % of the nominal wall with BAM on repair thickness measures Lid (outer and inner Surface conditions Maintenance Cleaning surface) Dirt, if it can impair the function of the package Regular and periodic Rev. No. Revision Prepared/Date Checked/Date Release NCS/ Release BAM/
Date Date 0 Original W. Bergmann/ F. Hilbert/ M. Kübel/ T. Nitz 11.04.2003 14.04.2003 15.04.2003 05.02.2004 1 PA-03-04 W. Bergmann T. Breuer F. Hilbert C. Kuschke Rev. 1 14.10.2013 14.10.2013 14.10.2013 24.10.2013
Inspection criteria PA-Nr. PA-03-04 Page 3 of 7 Inspection instructions: PA-03-04, Rev. 1 Component: Outer container inspections: Dirt Part Inspection for: Unacceptable are: Measures in case of non-conformities Maintenance Repair painting Damaged paint (cracks, flaking) with an extension greater than 1 cm2 Regular and periodic inspections Damaged paint (cracks, flaking)
Maintenance Derust, repair painting Signs of corrosion with an In case of significant extension greater than 2 material abrasion perform 1 cm a wall thickness Regular and periodic measurement and record Inspections in the package log book; Signs of corrosion If the measured wall thickness is more than 25 % below the requirements of the drawings replace the lid Mechanical damages Holes and cracks, dents Replace lid with a depth greater 30 mm, sharp edges Wall thickness Wall thickness is below Replace lid 25 % of the nominal wall thickness Gasket Cleanliness Dirt Cleaning General condition Damages, cracks Replace gasket Rev. No. Revision Prepared/Date Checked/Date Release NCS/ Release BAM/
Date Date 0 Original W. Bergmann/ F. Hilbert/ M. Kübel/ T. Nitz 11.04.2003 14.04.2003 15.04.2003 05.02.2004 1 PA-03-04 W. Bergmann T. Breuer F. Hilbert C. Kuschke Rev. 1 14.10.2013 14.10.2013 14.10.2013 24.10.2013
Inspection criteria PA-Nr. PA-03-04 Page 4 of 7 Inspection instructions: PA-03-04, Rev. 1 Component: Outer container Part Inspection for: Unacceptable are: Measures in case of non-conformities Clamping ring Surface conditions Maintenance Cleaning Dirt, if it can impair the function of the package Regular and periodic inspections:
Dirt Maintenance Replace clamping ring Signs of corrosion with an extension greater than 1 cm2 Regular and periodic Inspections Signs of corrosion Mechanical damages Holes, cracks, Replace clamping ring deformations Clamping ring screw Surface conditions Signs of corrosion, which Replace clamping ring may impair the function screw Mechanical damages Damaged threads and Replace clamping ring screw heads screw Rev. No. Revision Prepared/Date Checked/Date Release NCS/ Release BAM/
Date Date 0 Original W. Bergmann/ F. Hilbert/ M. Kübel/ T. Nitz 11.04.2003 14.04.2003 15.04.2003 05.02.2004 1 PA-03-04 W. Bergmann T. Breuer F. Hilbert C. Kuschke Rev. 1 14.10.2013 14.10.2013 14.10.2013 24.10.2013
Inspection criteria PA-Nr. PA-03-04 Page 5 of 7 Inspection instructions: PA-03-04, Rev. 1 Component: Insulating disk Part Inspection for: Unacceptable are: Measures in case of non-conformities Surface Surface conditions Dirt Cleaning Signs of corrosion and Derust; in case the damages of the surface function is impaired coating (white replace part discolouration are acceptable)
Mechanical damages Holes and cracks, dents Replace part with a depth greater 30 mm, holes, cracks Rev. No. Revision Prepared/Date Checked/Date Release NCS/ Release BAM/
Date Date 0 Original W. Bergmann/ F. Hilbert/ M. Kübel/ T. Nitz 11.04.2003 14.04.2003 15.04.2003 05.02.2004 1 PA-03-04 W. Bergmann T. Breuer F. Hilbert C. Kuschke Rev. 1 14.10.2013 14.10.2013 14.10.2013 24.10.2013
Inspection criteria PA-Nr. PA-03-04 Page 6 of 7 Inspection instructions: PA-03-04, Rev. 1 Component: Inner container Part Inspection for: Unacceptable are: Measures in case of non-conformities Inner cavity Surface conditions Dirt Cleaning Damaged paint (cracks, Repair paint flaking)
Signs of corrosion Derust, repair painting In case of significant material abrasion perform a wall thickness measurement and record in the package log book; If the measured wall thickness is more than 25 % below the requirements of the drawings the cask has to be separated resp. repair measures have to be agreed with BAM Mechanical damages Holes and cracks, dents Separate cask resp. agree with a depth greater with BAM on repair 30 mm, sharp edges measures Wall thickness Wall thickness is below Separate cask resp. agree 25 % of the nominal wall with BAM on repair thickness measures Sealing surface Surface conditions Dirt Cleaning Damage of paint (cracks, Repair paint flaking)
Signs of corrosion Derust, repair coating Mechanical damages Notches, furrows, Separate cask resp. agree scratches in the metallic with BAM on repair base material larger than measures 20 mm transversally in relation to the gasket Lid (outer and inner Surface conditions Dirt Cleaning surface)
Damage of paint (cracks, Repair paint Rev. No. Revision Prepared/Date Checked/Date Release NCS/ Release BAM/
Date Date 0 Original W. Bergmann/ F. Hilbert/ M. Kübel/ T. Nitz 11.04.2003 14.04.2003 15.04.2003 05.02.2004 1 PA-03-04 W. Bergmann T. Breuer F. Hilbert C. Kuschke Rev. 1 14.10.2013 14.10.2013 14.10.2013 24.10.2013
Inspection criteria PA-Nr. PA-03-04 Page 7 of 7 Inspection instructions: PA-03-04, Rev. 1 Component: Inner container Part Inspection for: Unacceptable are: Measures in case of non-conformities flaking)
Signs of corrosion Derust, repair painting In case of significant material abrasion perform a wall thickness measurement and record in the package log book; If the measured wall thickness is more than 10 % below the requirements of the drawings replace the lid Mechanical damages Holes and cracks, dents Replace lid with a depth greater 5 mm Wall thickness Wall thickness is below Replace lid 25 % of the nominal wall thickness Gasket Cleanliness Dirt Cleaning General condition Damages, cracks Replace gasket Fastening to the lid Damaged fastening Glue gasket to lid Screws and thread holes Surface conditions Signs of corrosion Replace screws, Rethread , if the tolerances specified in the higher ranking instructions are exceeded repair with Helicoil insert Mechanical damages Damaged threads and Replace screws, screw heads Rethread , if the tolerances specified in the higher ranking instructions are exceeded repair with Helicoil insert Rev. No. Revision Prepared/Date Checked/Date Release NCS/ Release BAM/
Date Date 0 Original W. Bergmann/ F. Hilbert/ M. Kübel/ T. Nitz 11.04.2003 14.04.2003 15.04.2003 05.02.2004 1 PA-03-04 W. Bergmann T. Breuer F. Hilbert C. Kuschke Rev. 1 14.10.2013 14.10.2013 14.10.2013 24.10.2013
Inspection Instruction No. PA-03-04 Rev. 1 Page 6 of 6 : Sample template for the repair of the light concrete surface
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