Updates on CENF SB WG CENF Project Meeting 17 th October 2013

1. Updates on CENF SB WGCENF Project Meeting 17thOctober 2013 M. Calviani on behalf of the CENF SB WG team

2. Revision of B755 and B757 M. Herranz, N. Baddams Updates on CENF SB WG - M. Calviani for the SBWG team

3. Stairwell enclosed to maintain a different ventilation path Increased space to allow for lifting striplines feedthrough with crane Pit for rising systems M. Herranz, N. Baddams Updates on CENF SB WG - M. Calviani for the SBWG team

4. Cut at the level of the service pit M. Herranz Updates on CENF SB WG - M. Calviani for the SBWG team

5. Decrease concrete thickness in the top part, to compensate for the need of longer concrete beams L. Faisandel Updates on CENF SB WG - M. Calviani for the SBWG team

6. !Fixes problem with trench integration! L. Faisandel, S. Girod Updates on CENF SB WG - M. Calviani for the SBWG team

7. CE status • Reaching an almost stable configuration with the presently available information • After CV feedback on integration we might proceed either to slightly revise it or not --- 2D & 3D synced • Need to revise implementation in EDMS • Clarification of deadline for specification for preliminary technical drawings needed! • Naming of the various accessible underground areas launched within GS (yesterday) • Will be important to univocally associated naming to different areas (for ventilation & safety assessment) Updates on CENF SB WG - M. Calviani for the SBWG team

8. Integration update • Discussions with K. Kershaw concerning the applicability of the ITER Remote Handling Code of Practice for perfect vertical movement • Idea is to improve the handling of the initial horn/reflector support structure • Double layer of iron: • Facilitate reduction of streaming • Waste zoning and dismantling will benefit (see link) • Two solutions under investigations: • Closed box (see later) • Open box (not analysed still in detail) Updates on CENF SB WG - M. Calviani for the SBWG team

9. CLOSED BOX Double block, 120 cm height, 80 cm width “simpler” shape with respect to previous versions Alignment and support rods S. Girod, K. Kershaw Updates on CENF SB WG - M. Calviani for the SBWG team

10. S. Girod, K. Kershaw Alignment and support rods Cooling pipes passage Updates on CENF SB WG - M. Calviani for the SBWG team

11. OPEN BOX K. Kershaw Updates on CENF SB WG - M. Calviani for the SBWG team

12. Radioprotection update Updates on CENF SB WG - M. Calviani for the SBWG team C. Strabel, H. Vincke, K. Zabrzycki

13. C. Strabel, H. Vincke, K. Zabrzycki Updates on CENF SB WG - M. Calviani for the SBWG team

14. As neutrons are limited, no sky shine effect is to be expected C. Strabel, H. Vincke, K. Zabrzycki @40 m Updates on CENF SB WG - M. Calviani for the SBWG team

15. Prompt ambient dose rate at CERN fence > 5 mSv/h C. Strabel, H. Vincke, K. Zabrzycki Vertical average = ~20-50 m Longitudinal average up to 200 m Updates on CENF SB WG - M. Calviani for the SBWG team

16. Target design update • Two solutions for target cooling under consideration • 6 mm radius, 100 cm long, graphite PT2020, He-cooled • Beryllium single outer casing to prevent graphite bending with He circulation in interstitial (preliminary results next page) • Beryllium double casing with external/internal flow (next in line) See A. Perillo-Marcone 3rd CENF SB (link) V. Venturi, A. Perillo-Marcone Updates on CENF SB WG - M. Calviani for the SBWG team

17. He cooling pressure @10 bar • MaxT for graphite ~600 K • Surface graphite T ~350-550 K • DT He ~120 K • Preliminary results promising V. Venturi, A. Perillo-Marcone Updates on CENF SB WG - M. Calviani for the SBWG team

18. Target design update on-going work • Solution 1: • Analyse dynamical stresses • Check “stagnant” locations and improve target shape • Analyse downstream window heating • Could be limited by high stresses with graphite and high-T expanding towards the Be external vessel • Solution 2: • “safer” solution • Larger footprint of the overall target assembly – with reduced distance if horn neck is kept fixed at 24 mm • Both solutions to be presented/discussed in detail at the next SB WG meeting 6th November Updates on CENF SB WG - M. Calviani for the SBWG team

19. Ventilation systems upgrade • Volumes of the various areas are now available • EN/CV will finalize ASAP the extraction flow rate • ... Together with DGS/RP, this will allow DGS/SEE to provide semi-final impact into environment • Following EN/CV proposition at last SBWG meeting (link), modification of the rising systems • EN/CV draughtsman started addressing dimensions/cotes in the CATIA model – results at the next SBWG meeting Updates on CENF SB WG - M. Calviani for the SBWG team

20. SB preliminary risks analysis • S. Hutchins launched the WG during last PTM (link) • S. Hutchins and F. Valentini prepared a first APR table, which will be further discussed at the SB WG and then at the safety WG according to Steve’s plans NB: important to name the areas in a common and agreed way – see CE points S. Hutchins, F. Valentini Updates on CENF SB WG - M. Calviani for the SBWG team

21. m detectors/Alignment • In the next 2 weeks we’ll start addressing muondetectors • Availability from UniGE to collaborate on Si-detectors technology • Need to address timing needs, installation possibilities, granularity needed, etc. – collaboration with experiment(s) • Sensitivity on target/horn and reflector alignment • Will be analysed in the next to week (Alfredo/Wioletta), to confirm the need for “mm-class” transversal movement • Will provide also indication on the required spacing between detectors in the two m pits Updates on CENF SB WG - M. Calviani for the SBWG team