Device and method for detecting trace leakage liquid of reactor operation unit

The invention provides a reactor operation unit trace leakage liquid detection device and detection method.The detection device comprises a collection cavity, a condensation circulation pipeline and a detection mechanism, a partition plate is vertically arranged in the collection cavity, the collection cavity is divided into a first cavity and a second cavity, the bottoms of the first cavity and the second cavity are communicated, and the first cavity is connected with a leakage guiding pipeline; receiving high-temperature steam and/or high-temperature liquid of the leaked liquid; the condensation circulation pipeline is provided with a first condensation branch and a second condensation branch, the first condensation branch is arranged in the first cavity in a penetrating mode, the second condensation branch is arranged in the second cavity in a penetrating mode, and the second cavity is in negative pressure; and the detection mechanism is arranged below the collection cavity and is used for receiving and me