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Nuclear reactor neutron shielding

United States Patent

9,761,332
September 12, 2017
View the Complete Patent at the US Patent & Trademark Office
A nuclear reactor includes a reactor pressure vessel and a nuclear reactor core comprising fissile material disposed in a lower portion of the reactor pressure vessel. The lower portion of the reactor pressure vessel is disposed in a reactor cavity. An annular neutron stop is located at an elevation above the uppermost elevation of the nuclear reactor core. The annular neutron stop comprises neutron absorbing material filling an annular gap between the reactor pressure vessel and the wall of the reactor cavity. The annular neutron stop may comprise an outer neutron stop ring attached to the wall of the reactor cavity, and an inner neutron stop ring attached to the reactor pressure vessel. An excore instrument guide tube penetrates through the annular neutron stop, and a neutron plug comprising neutron absorbing material is disposed in the tube at the penetration through the neutron stop.
Speaker; Daniel P (Lynchburg, VA), Neeley; Gary W (Forest, VA), Inman; James B (Forest, VA)
BWXT mPower, Inc. (Charlotte, NC)
14/ 299,353
June 9, 2014
This invention was made with Government support under Contract No. DE-NE0000583 awarded by the Department of Energy. The Government has certain rights in this invention.