This paper describes the evaluation performed to determine the bounding T-RTNDT for the Boiling Water Reactor (BWR) Water Level Instrumentation (WLI) nozzle for use in establishing reactor pressure vessel Pressure-Temperature (P-T) curves. The evaluation used finite element based fracture mechanics to augment the methods described in the ASME Boiler & Pressure Vessel Code, Section XI, Appendix G. A 3-D finite element linear elastic fracture mechanics analysis was conducted to determine the mode I stress intensity factor at the tip of a 1/4 thickness postulated flaw in the nozzle blend radius. Also included is a general discussion on the impact on the P-T curves of the postulated irradiation shift in RTNDT at the WLI nozzle.

Volume Subject Area:
Codes and Standards
Topics:
Boiling water reactors, Fracture mechanics, Instrumentation, Irradiation (Radiation exposure), Nozzles, Vessels, Water, Finite element analysis, Boilers, Pressure, Pressure vessels, Reactor vessels, Stress, Temperature
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Copyright © 2012 by ASME
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