ML23045A114
| ML23045A114 | |
| Person / Time | |
|---|---|
| Site: | 07109388 |
| Issue date: | 02/09/2023 |
| From: | Hennebach M, Van Wijk Y Orano NCS GmbH |
| To: | Pierre Saverot Office of Nuclear Material Safety and Safeguards, Document Control Desk |
| Shared Package | |
| ML23045A113 | List: |
| References | |
| 0045-SVK-2023-003, EPID L-2020-NEW-0003 | |
| Download: ML23045A114 (1) | |
Text
Orano NCS GmbH, Margarete-von-Wrangell-Strae 7, D-63457 Hanau Orano NCS GmbH Mr. Pierre M. Saverot, Project Manager Ansprechpartner Yara van Wijk Storage and Transportation Licensing Branch Abteilung Division of Fuel Management Telefon +49 6181 501 353 Office of Nuclear Material Safety and Telefax Safeguards E-Mail yara.vanwijk@orano-ncs.com U.S. Nuclear Regulatory Commission Two White Flint North - Mail Stop T4-B34 Datum 09.02.2023 11545 Rockville Pike Rockville, MD 20852-
_ 2738 USA
Your reference: Docket No. 71-9388 and EPID No. L2020-NEW-0003 Our reference: 0045-SVK-2023-003
Subject:
DN30-X package: exchange of two pages in Appendix 2.2 of the SAR
Dear Mr. Saverot,
in response to your RAI 2.2, we performed a detailed structural analysis on the step weld WS12 between the CCRs and the lattice holders specified in weld seam list 0045-ZFZ-1000-002 (Appendix 1.4.1A of SAR 0045-BSH-2020-001). This analysis is documented in Section 7.2.8 of Appendix 2.2 (Rev. 0, submitted with Rev. 2 of the SAR). The Appendix 2.2 was not changed for Rev. 3 of the SAR.
This analysis revealed that a change of weld spec ification WS12 was required. Therefore, we changed the specification from an 8 x 10 mm step weld on one side of each CCR/lattice holder connection in the weld seam list to a 6 x 10 mm step weld on both sides of each CCR/lattice holder connection. The total weld length per CCR thereby increased from 240 mm to 360 mm. Furthermore, the effective weld thickness of WS12 was changed from 3 mm to 4 mm.
The detailed structural analysis is based on this initial weld specification of a 6 x 10 mm step weld.
However, while discussing the assembly of interior CCS with the manufacturer of the 30B-X cylinder prototypes, it was noted that reaching the whole circumference of each CCR belonging to the inner, middle, and outer CCR ring with a welding apparatus might be very difficult. The solution is to start with the central CCR and subsequently adding the outward CCRs. This keeps a large portion of the circumference of each CCR open for welding, but still makes a 6 x 10 mm step weld challenging. A weld of 2 x 30 mm is easier to attain and has the same total weld length in the design drawings as is assumed in the structural proof.
This change was indicated in the revised weld seam list, but unfortunately no note was added to the detailed structural analysis of the step weld.
Orano NCS GmbH, Margarete-von-Wrangell-Strae 7, 63457 Hanau, Deutschland Telefon: +49 (0) 61 81 501-0, Telefax: +49 (0) 61 81 57 36 92, E-Mail: info.ncs@orano-ncs.com, www.orano-ncs.com Sitz der Gesellschaft: Hanau, RG Hanau HR B 4428, USt-Id.-Nr. DE113574961, Gerichtsstand: Hanau, Geschftsführer: Olaf Oldiges BaBankverbindung: Société Générale Frankfurt (BLZ 512 108 00), Konto: 1095013031, SWIFT: SOGEDEFF, IBAN: DE 45 5121 0800 1095 0130 31 AuAuftrge werden auf Grundlage unserer Allgemeinen Geschftsbedingungen übernommen. Diese stehen Ihnen auf Wunsch zur Verfügung.
SV-0808/00-GF 1/2
We would like to resolve the disconnect between the design drawings and the structural analysis by adding an explanation to the latter. As this change is limited to Section 7.2.8 of Appendix 2.2 to the SAR, we would prefer submitting exchange pages instead of creating a new SAR revision only for this change.
The added explanation is found at the beginning of Section 7.2.8 on page 176 of Appendix 2.2. To avoid pushing some text from page 176 to page 177 and beyond (and thereby creating more exchange pages than necessary), we also made some formatting changes on page 175 (reduced line spacing in table 7-16 and a slight rephrase of the next sentence: from... in the area where [ ] occurs to... in the area with....
We therefore provide the two exchange pages 175 and 176, documenting the end of Section 7.2.7.5 and the beginning of Section 7.2.8.
We remain available for any additional questions you might have on this package.
Attachment:
Exchange pages 175 and 176 for Appendix 2.2 (Rev. 0) of SAR 0045-BSH-2020-001
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SV-0808/00-GF 2/2