Abstract
In Korea, 20 PWRs are operating and 4 more PWRs are under construction. The in-vessel neutron dosimetry programs have been designed and implemented since each plant began operation. In addition to the in-vessel dosimetry program, ex-vessel neutron dosimetry systems have been installed for 16 PWRs. The objective of this paper is to describe the in-vessel and ex-vessel neutron dosimetry program of the PWRs in Korea and to compare in-vessel and ex-vessel dosimetry evaluation results. For this purpose plant and cycle specific forward neutron transport calculations and dosimetry measurement evaluations were carried out according to Regulatory Guide 1.190. Comparisons between the calculations and measurements were also performed for the reaction rates of each dosimetry sensor and the results show good agreement.
Highlights
In Korea, 20 PWRs are operating and 4 more PWRs are under construction
In Korea, ex-vessel neutron dosimetry systems have been installed for 16 PWRs in the reactor cavity annulus in order to characterize the neutron energy spectrum variations axially and azimuthally over the beltline region of the reactor vessel
The surveillance capsules of CE-design Korea Standard Nuclear Power Plant (KSNP) plants are placed in capsule holders that are attached to the reactor vessel cladding
Summary
Of the PWRs, two are Westinghouse-design two-loop plants, four are Westinghouse-design three-loop plants, two are Framatome-design three-loop plants, and the others are Korea Standard Nuclear Power Plant (KSNP), similar to CE-design plants. In Korea, ex-vessel neutron dosimetry systems have been installed for 16 PWRs in the reactor cavity annulus in order to characterize the neutron energy spectrum variations axially and azimuthally over the beltline region of the reactor vessel. The ex-vessel neutron dosimetry system consists of steel chains and capsules, the chains were used to provide measurements of fluence variation and the capsules were used to provide details of neutron spectrum
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