Remote Handling Fasteners

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Presentation transcript:

Remote Handling Fasteners Erik Nilsson Mechanical Engineer ESS Chopper Group www.europeanspallationsource.se 28 April, 2019

Standard screws Remote handling fasteners for remote handling interfaces. Few bolts as possible. Few sizes as possible. Titanium screws. Threads in aluminium shall be made using threaded inserts. Helicoil Plus A4 inserts or equivalent are recommended.

Captive pop-up design

Materials changes – Updated activation tables (March) The source term was updated to the most recent one (significant change). The duct source variance reduction was turned off, and the source position moved (minor tweak). The method of computing the worker dose was originally a very rough area multiplication with the DCHAIN output. The new normalisation uses a microkernel method for arbitrary source shapes, and is cross-checked against the 1 m sphere calculation reported in DCHAIN results The activation concentrations were thoroughly cross-checked with similar calculations done by target division.

Materials changes Some steels are comparable to Titanium now. Lower comparable strengths (880MPa Yield to ~300MPa Yield). 1.4404 1.4162 1.4016 8.8 (impurities issues)

Irradiation tests planned to confirm simulations Way forward Suggestion: Keep Titanium bolts for general RH use. Possibility to use Low strength stainless if calculated accordingly Irradiation tests planned to confirm simulations