METHOD AND APPARATUS FOR MANUAL REPLACEMENT OF OLD SPLIT PINS SETS WITH NEW SPLIT SPLIT SETS IN NUCLEAR REACTOR GUIDE TUBES

摘要

REPLACEMENT OF SLOTTED PINS 71 IN THE LOWER GUIDE TUBES OF A NUCLEAR REACTOR IS MADE IN AN UNDERWATER POST THAT REMOVES AN OLD SET 33; 35 OF SPLIT PINS AND INSTALLS A SET 84 OF NEW SPLIT PINS. THE WITHDRAWAL IS DONE THROUGH A SAW AND A DRILL. A DIVIDED SAW EACH OLD SET OF SLOTTED PINS BELOW A COLLET 77 WHICH COMES TO MEET THE BASE OF THE LOWER DRILLING 39 OF THE LOWER GUIDE TUBE, WHICH SEPARATES THE OLD SET OF SPLITTED PINS A SECOND FRAGMENT INCLUDING THE COLLET AND THE REMAINDER OF THE SPLIT PIN SPLIT WITH THE NUT 86 WHICH IS SCREWED ONTO IT. THE SECOND FRAGMENT IS DIVIDED INTO A THIRD FRAGMENT INCLUDING THE COLLAR AND A FOURTH FRAGMENT INCLUDING THE REST OF THE PIN AND THE NUT, WHICH MAY BOTH BE REMOVED FROM THE LOWER GUIDE TUBE. NEW NUTS 85 ARE MOUNTED AND TIGHTENED ON NEW SLOTTED PINS 83. BOWLS 101 ON THE NUTS ARE TIGHTENED.