41. Put another way, the coolant must remain in the liquid state at all times, especially in the reactor vessel . 42. In 2014 the Barakah 1 reactor vessel was delivered onsite and site preparation works for Barakah 3 and 4 started. 43. But in the blueprints submitted in October 1967, the two tubes were connected with each other outside the reactor vessel . 44. The inspection revealed bolts in the bottom of the cooling pumps as well as the bottom of the reactor vessel . 45. The reactors vessels were supplied by Whessoe, reactor machinery was supplied by Strachan & Henshaw and the turbines by GEC. 46. After breaching the reactor vessel , the conditions in the reactor cavity below the core govern the subsequent production of gases. 47. For instance, the NRC and the industry decided that some components _ such as reactor vessel lids _ posed little risk. 48. The powdery material was on the outside of two instrument guide tubes where they enter the bottom of the reactor vessel . 49. No one in the United States has replaced a reactor vessel head, although several plants have ordered parts to do so. 50. An extension was bolted to the top of the reactor vessel so that a larger S5W reactor core could be installed.