STATUS OF THE ASTRID CORE AT THE END OF THE PRE-CONCEPTUAL DESIGN PHASE 1 oleh MS. CHENAUD, N. DEVICTOR, G. MIGNOT, F. VARAINE, C. VÉNARD, L. MARTIN, M. PHELIP, D. LORENZO, F. SERRE, F. BERTRAND, N. ALPY, M. LE FLEM, P. GAVOILLE, R. LAVASTRE, P. RICHARD, D. VERRIER, D. SCHMITT