ML19255F208

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Enclosure 5: Letter from Technetics Group France September 2019
ML19255F208
Person / Time
Site: 07109325
Issue date: 09/05/2019
From: Sauvinet F
Technetics Group France
To: Sinha S
Holtec, Office of Nuclear Material Safety and Safeguards
References
1553042-NRC, EPID: L-2019-LLA-0122
Download: ML19255F208 (1)


Text

EnPro Industries companies Sige Social : 90 rue de la Roche du Geai. 42029 Saint Etienne Cedex 1 France - france@techneticsgroup.com S.A.S. au capital de 4 840 000 - RCS : B 400 072 997 Saint Etienne Savit Sinha Senior Project Manager Holtec International Phone: 856-797-0900 Extn: 3685 E-mail: s.sinha@holtec.com Cc: Mr. Chris Cosgrove (Technetics)

Ms. Stéphanie Ruel (Technetics)

Mr. Florent Ledrappier (Technetics)

Subject:

Maximum temperature on seals Date:

September 5th, 2019

Dear Mr Sinha,

Youll find below recommendations regarding maximum reachable temperature for Silver seals on your cask container.

The Helicoflex Silver seals (HN-200) can function under the following conditions:

Temperature Duration

>200°C*

Leak tight up to 50 years

>250°C*

Leak tight up to 1 year

>450°C*

Leak tight up to 1 Week

>450°C*

Leak tight up to 5 days

  • Upper limit is not known These are based on Technetics experience with silver seals in similar conditions.

It has been stated by Holtec that no unloading on the seal will occur.

Best regards, Frédéric Sauvinet HELICOFLEX seals Product Manager Technetics Group France 90, rue de la Roche du Geai 42029 Saint Etienne cedex 1, FRANCE Tél: +33 (0) 4 77 43 51 00 Fax: +33 (0) 4 77 43 51 51 www.techneticsgroup.com