SYMPOSIA PAPER Published: 01 August 2012

Korean Standard Nuclear Plant Ex-Vessel Neutron Dosimetry Program Ulchin 4


A comprehensive ex-vessel neutron dosimetry (EVND) surveil-lance program has been deployed in 16 pressurized water reactors (PWR) in South Korea and EVND dosimetry sets have already been installed and analyzed in Westinghouse reactor designs. In this paper, the unique features of the design, training, and installation in the Korean standard nuclear plant (KSNP) Ulchin Unit 4 are presented. Ulchin Unit 4 Cycle 9 represents the first dosimetry analyzed from the EVND design deployed in KSNP plants: Yongg-wang Units 3 through 6 and Ulchin Units 3 through 6. KSNP's cavity configuration precludes a conventional installation from the cavity floor. The solution, requiring the installation crew to access the cavity at an elevation of the active core, places a premium on rapid installation due to high area dose rates. Numerous geometrical features warranted the use of a detailed design in true 3D mechanical design software to control interferences. A full-size training mockup maximized the crew ability to correctly install the instrument in minimum time. The analysis of the first dosimetry set shows good agreements between measurement and calculation within the associated uncertainties. A complete EVND system has been successfully designed, installed, and analyzed for a KNSP plant. Current and future EVND analyses will continue supporting the successful operation of PWR units in South Korea.

Author Information

Duo, J., I.
Westinghouse Electric Company LLC, Cranberry Township, PA, US
Chen, J.
Westinghouse Electric Company LLC, Cranberry Township, PA, US
Kulesza, J., A.
Westinghouse Electric Company LLC, Cranberry Township, PA, US
Fero, A., H.
Westinghouse Electric Company LLC, Cranberry Township, PA, US
Yoo, C., S.
Korea Atomic Energy Research Institute, Daejeon, KP
Kim, B., C.
Korea Reactor Integrity Surveillance Technology, Daejeon, KP
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: E10
Pages: 13–21
DOI: 10.1520/STP155020120002
ISBN-EB: 978-0-8031-7553-2
ISBN-13: 978-0-8031-7536-5