ML23168A003

Handout for 6/23/2023 Pre-Application Public Meeting with Prairie Island Nuclear Generating Plant to Revise ISFSI TS 4.4 for TN-40HT Casks

ML23168A003
Person / Time
Site:	Prairie Island
Issue date:	06/20/2023
From:	Xcel Energy
To:	Office of Nuclear Material Safety and Safeguards
References
Download: ML23168A003 (1)

Text

Prairie Island License Amendment Request to Revise ISFSI TS 4.4, Codes and Standards for the TN-40HT Casks 06.23.2023

Agenda

• Purpose

• Background

• Proposed Licensing Action

• Schedule 2

© 2022 Xcel Energy

Purpose Discuss proposed license amendment for Prairie Island Nuclear Generating Plant (PINGP) Independent Spent Fuel Storage Installation (ISFSI) Technical Specifications (TS) to allow use of a code alternative to the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code.

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© 2022 Xcel Energy

Background

• Xcel Energy is fabricating TN-40HT casks through the OEM (Orano/TN Americas)

• The current fabrication order is for eight TN-40HT casks. Four casks have been received, three of which have been loaded.

• During fabrication of the remaining four casks, the OEM identified that a required non-destructive examination (NDE) magnetic particle (MT) inspection of the shell flange base material prior to welding (see Figure 1) was not performed in accordance with the fabrication sequence.

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Background (continued)

Figure 1 - Weld Configuration 5

© 2022 Xcel Energy

Background (continued)

• Orano and Xcel Energy have developed an alternative NDE examination for the base metal and weld.

• The alternate method uses an enhanced RT examination or a Phase Array ultrasonic (PAUT) examination along with radiography (RT) on the completed weld.

• The examinations have been completed satisfactorily, but a License Amendment Request (LAR) is required to allow the alternate inspection method.

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© 2022 Xcel Energy

Proposed Licensing Action

• Revise PINGP ISFSI TS 4.4, Table 4.4-1, TN-40HT ASME CODE EXCEPTIONS, to add optional volumetric examinations for TN-40HT inner shell welds.

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© 2022 Xcel Energy

Proposed Licensing Action (continued)

Summary of Proposed Technical Specifications Changes 8

© 2022 Xcel Energy

Proposed Licensing Action (continued)

Summary of Proposed Technical Specifications Changes 9

© 2022 Xcel Energy

Schedule

• Submittal date - 7/31/23

• NRC approval - 6/25/24

• These dates support fabrication and the cask loading schedule.

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© 2022 Xcel Energy

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