CONTROL RODSDOE-HDBK-1019/2-93Reactor Theory (Nuclear Parameters)CONTROL RODSMost reactors contain control rods made of neutron absorbing materials that areused to adjust the reactivity of the core. Control rods can be designed and usedfor coarse control, fine control, or fast shutdowns. EO 5.1DESCRIBE the difference between a "grey" neutron absorbingmaterial and a "black" neutron absorbing material.EO 5.2EXPLAIN why a "grey" neutron absorbing material may bepreferable to a "black" neutron absorbing material for use incontrol rods.EO 5.3EXPLAIN why resonance absorbers are sometimes preferredover thermal absorbers as a control rod material.EO 5.4DEFINE the following terms:a.Integral control rod worthb.Differential control rod worthEO 5.5DESCRIBE the shape of a typical differential control rodworth curve and explain the reason for the shape.EO 5.6DESCRIBE the shape of a typical integral control rod worthcurve and explain the reason for the shape.EO 5.7Given an integral or differential control rod worth curve,CALCULATE the reactivity change due to a control rodmovement between two positions.EO 5.8Given differential control rod worth data, PLOT differentialand integral control rod worth curves.Selectionof ControlRodMaterialsRods of neutron-absorbing material are installed in most reactors to provide precise, adjustablecontrol of reactivity. These rods are able to be moved into or out of the reactor core andtypically contain elements such as silver, indium, cadmium, boron, or hafnium.NP-03Rev. 0Page 48
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
