Experimental assessment of neutron fluence for the Kozloduy Unit 1 pressure vessel by scraps and cavity dosimetry Original Research Article

In accordance with the Safety Improvement Program the neutron exposure onto the Kozloduy Unit 1 pressure vessel has been evaluated. The conservative fluence values have been used for the reembrittlement assessment of the pressure vessel. The verification of the calculated neutron fluence has been provided by comparing the calculated and experientially determined induced activities of the scraps taken out from the weld four and of the copper, iron, and niobium detectors irradiated in the cavity behind the vessel.