Work

Development of shroud remotely operated vehicle for ultrasonic testing (Formulation of design requirements and development of a vehicle for internal surface operations of shrouds)

Year: 2026

Type: article

Abstract: This paper presents the development and application of phased array ultrasonic testing (PAUT) and a remotely operated vehicle (ROV) for the in-vessel inspection of boiling water reactor (BWR) internals. Since the 1990s, stress corrosion cracking in reactor internals has emerged as a critical issue, leading to an increasing demand for thorough inspections. This paper highlights the advantages of the water immersion method and the outcomes of ROV development. Notably, the authors developed a flat-type ROV for shroud inspection named the Shroud Vehicle for Shroud I.D., which can adhere to the shroud surface using thrusting propellers and mechanically scan through a circle opening as small as approximately 270 mm. The positioning accuracy of the ROV and its applications for shroud UT are also tested.

Source: Transactions of the JSME (in Japanese)

DOI: 10.1299/transjsme.25-00132

Authors: Yasuhiro YUGUCHI, Tetsuro NAKAGAWA, Takeshi MAEHARA, Ikuko KAMEYAMA, Tomomi KUBO

Institutions: Toshiba (Japan), Toshiba Energy Systems & Solutions Corporation (Japan)

Language: English

Topic: Non-Destructive Testing Techniques

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $602