ML19213A025

Ultra Electronics - Update to ML19155A084 10CFR21 Interim Report

ML19213A025
Person / Time
Site:	Sequoyah
Issue date:	07/26/2019
From:	Hawkins G Ultra Electronics
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML19213A025 (1)

Text

{{#Wiki_filter:Update to ML19155A084 10CFR21 Interim Report Ultra Electronics 26 July 2019 . Energy 707 Jeffrey Way PO Box300 .

• United States Nuclear Regulatory Commission Round Rock, TX 78680-0300 ATIN:.Document Control Desk Tel +1 512 434 2800 Fax +1. 512 434 2801
• Washington, DC 20555-0001

Dear Sir or Madam:

We have previously communicated an interim 10CFR21 report NRC reference ML19155A084, Which we now wish to update as a result of the investigatory work performed:

• There have been two fruitful discussions with the NRC on the regulatory and technical implications of this investigation and we would like to thank the NRC staff concerned for.their assistance.

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• We have examined the original qualification experiments and the activation energy values used to ensure they provide valid inputs to the mathematical models. '
• We have refined the mathematical models used to determine qualified service lives from accelerated thermal ageing data for the Foxboro Weed N-Ell & N-E13 Series transmitters, and other devices within the extent of the condition, to better reflect the impact of cornpone_nt self-
• heating.

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• The impact on qualified service life of the revised mathematical models is modest for typical plant conditions, and we do not therefore believe that it poses a significant risk to nuclear safety.

We will shortly be contacting the licensees operating devices within the extent of the condition in order to provide them with a packaged* software tool that will allow them to determine the impact of this issue for their spe~ific plant conditions. We have revised the completion date for the inve~tigation from 3rd August 2019 to 1ih September 2019 because of the complex nature of the investigation and we are confident of closure by this revised date. Best Regards Gary. M. Hawkins Vice President Engineering

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• a business name of Weed Instrument Co., Inc.

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