PURPOSE: A stud bolt sealing cap for a nuclear power plant is provided to improve the stability of the nuclear power generation by checking a pressure leakage indicator when the nuclear fuel is leaked. CONSTITUTION: A housing(10) stores a stud bolt. An upper plate(20) is fixed and installed in the upper part of the housing and seals hermetically the housing. A hexagonal wrench bolt(30) is installed by passing through the upper plate and couples the stud bolt which is stored inside the housing. The upper plate comprises a quick connector(22) which injects air into the inside of the housing and a pressure leakage indicator(21). The pressure leakage indicator measures the pressure injected inside the housing through the quick connector.
