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Report No.
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Conceptual structure design of high temperature isolation valve for high temperature gas cooled reactor

Takada, Shoji; Abe, Kenji*; Inagaki, Yoshiyuki

The high temperature isolation valve (HTIV) is a key component to assure the safety of a high temperature gas cooled reactor connected with a hydrogen production system for protections of radioactive material release from the reactor to the hydrogen production system as well as of combustible gas ingress to the reactor during accidents. The conceptual structure design of an angle type HTIV was carried out to propose a draft overall structure based on the diameter of seat of 445 mm from fabrication experiences of valve makers. Numerical results showed that the thermal stress locally increased at the root of the seat which was connected with the valve box. The stress was lowered below the allowable limit 120 MPa by decreasing thickness of the connecting part and increasing the temperature of valve box to around 350 $$^{circ}$$C. Creep analysis was also carried out to estimate a creep-fatigue damage based on the temperature history of the normal operation and the depressurization accident.

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Category:Engineering, Mechanical

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