Molten salt nuclear reactor core having a bulbous shape

A nuclear reactor core (1) for a molten salt nuclear reactor (100), said nuclear reactor core (1) comprising:

• a first tubular vessel (10) having an inner radius and a first inlet (12) and a first outlet (13) and a first passage communicating from said first inlet and said first outlet, said tubular vessel characterized by a first axis extending from said first inlet (12) to said first outlet (13) with said first passage extending along the first axis,
• a plurality of second tubular vessels (20), each of the plurality of second tubular vessels (20) having a second inlet (22) and a second outlet (23) and a second passage communicating from said second inlet and said second outlet,
• a plurality of third tubular vessels (30), each of the plurality of third tubular vessels (30) having a third inlet (32) and a third outlet (33) and a third passage communicating from said third inlet and said third outlet (33),
• wherein
• said plurality of second tubular vessels (20) are assembled to form a first jacket surrounding said first tubular vessel (10),
• said plurality of third tubular vessels (30) are assembled to form a second jacket, said second jacket surrounding said first jacket, and
• the first tubular vessel (10) has a first bulbous outer contour, and
• the first inlet (12) has an inner cross-sectional area on a first plane that is transverse to the first axis that is smaller than an inner transverse cross-sectional area of a medial portion of the first tubular vessel (10) disposed between the first inlet (12) and the first outlet (13), and
• the first outlet (13) has an inner cross-sectional area on a second plane that is transverse to the first axis that is smaller than the inner transverse cross-sectional area of the medial portion of the first tubular vessel (10) disposed between the first inlet (12) and the first outlet (13).