ML19290E730

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Daher Nuclear Technologies Gmbh, Securing Bolt of the Closure Devices of the DN30 PSP
ML19290E730
Person / Time
Site: 07109362
Issue date: 10/17/2019
From: Hilbert F, Van Wijk Y
Daher Nuclear Technologies GmbH
To: Pierre Saverot
Document Control Desk, Office of Nuclear Material Safety and Safeguards
Shared Package
ML19290E727 List:
References
USA/9362/AF-96, 0023-SVK-2019-024, EPID L-2018-NEW-0003
Download: ML19290E730 (2)


Text

    • . ilAHER DAHER NUCLEAR TECHNOLOGIES GmbH, Postbox 1385, 63514 Rodenbach Mr. Pierre M. Saverot Project Manager Storage and Transportation Licensing Branch Division of Fuel Management Office of Nuclear Material Safety and Safeguards U.S. Nuclear Regulatory Commission Two White Flint North - Mail Stop T 4-834 11545 Rockville Pike Rockville, MD 20852-2738 USA lhre Zelchen / Nachrlcht vom Your ref./ message USA/9362/AF-96 Unser Zelchen / Nachrlcht vom Our ref. I message 0023-SVK-2019-023 Telefon/Fax/E-Mall
Hanau, October 17, 2019

+49 (0)6181 501 353

+49 (0)6181 501 266 y.vanwijk@daher.com

Subject:

Securing bolt of the closure devices of the DN30 PSP

Dear Mr. Saverot,

This is to apply for a small change at the closure devices.

During our training phase with a client of the DN30 PSPs, we noticed that the M 16 bolts securing the pins in the closure devices could not always be fastened because some of them were slightly too long and therefore touched the upper part of the head of the pin. Measurements showed that these bolts were 0.5 mm longer than indicated in drawing 0023-ZFZ-1000-103-RevO.

Moreover, it was discovered that the tightening torque of 80 Nm for these securing bolts indicated in the handling instructions was not enough to allow for a similar or higher loosening torque with the combination of the bolt and closure device materials.

Therefore, two more small changes had to be made to the DN30 package without having any safety impact:

Adjusting the length of the securing bolts from 52 mm to 50 mm to accommodate manufac-turing tolerances (drawing 0023-ZFZ-1000-103-Rev1)

Correcting the tightening torque of these bolts from 80 Nm to 150 Nm (handling instructions 0023-HA-2015-001-RevS) as explained in calculation report 0023-BBR-2019-006-RevO Moreover, a few questions were raised by the German BAM for the validation of the French certifi-cates, which lead us to revise the dose rate measurement and inspection instructions.

DAHER NUCLEAR TECHNOLOGIES GmbH, Margarete-von-Wrangell-StraBe 7, 63457 Hanau, Germany Telefon: +49 (0)6181 501-0, Telefax: +49 (0)6181 57 36 92, E-Mail: info.nuclear-technologies@daher.com, Internet: www.daher.com Sitz: Hanau, RG Hanau HR B 4428, USt-ld-Nr DE113574961, Gerichtsstand* Hanau, Geschaftsfuhrer* Olaf Oldlges Bankverbindung Societe Generale Frankfurt (BLZ 512 1 OB 00), Konto 1095013031, SWIFT. SOGEDEFF, IBAN DE 45 5121 0800 1095 0130 31 Auftrega warden aufgrund unsarer Allgemeinen Gascheftsbedingungen Gbemommen Diese stehen Ihnen auf Wunsch zur Verffigung SV-0432/05-F 1/2

    • *oAHER To complete our request for revision (Rev2) of the certificate of compliance USA/9362/AF-96, we have included a list below with all documents attached:

App 1.4.1 - 0023-STL-1 OOO-OOO-Rev6 - Parts list and drawings [PROPRIETARY]

o 0023-ZFZ-1000-103-Rev1 - Securing bolt App 1. 7.1 - 0023-HA-2015-001-Rev6 - Use and Handling o

Adjustment of the tightening torque of the securing bolts App 1.7.2-0023-PA-2015-017-Rev2-Contamination and Dose rate measurement

[PROPRIETARY]

o Updated illustrations for measurements App 1.8.1 - 0023-PA-2015-015-Rev4 - Periodical inspections o

Rework of the soap bubble test o

Standards added to test criteria App 1.8.2 - 0023-PA-2015-016-Rev4 - Inspection criteria o

Small corrections Calculation report 0023-BBR-2019-006-RevO [PROPRIETARY]

We would be grateful if you could treat our application with priority.

LEAR TECHNOLOGIES GmbH SV-0432/05-F 2/2