NDLI: Temporary Acceptance of Leaking Brazed Joints

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Guideline on Application Process of Techniques Developed for Repair, Replacement and Mitigation Activities

Study on Promoting Use of Repair, Replacement and Mitigation Techniques in Maintenance Activities of Nuclear Power Plants

Temporary Acceptance of Leaking Brazed Joints

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Pilot Study for Uncertainty Analysis in Probabilistic Fitness-for-Service Evaluations of Zr-2.5Nb Pressure Tubes: Identification of Influential Variables

Pilot Study for Uncertainty Analysis in Probabilistic Fitness-for-Service Evaluations of Zr-2.5Nb Pressure Tubes: Uncertainty Characterization

The Reciprocal Effect Among a Quarter-Circle Corner Crack and a Non-Aligned Surface Crack of Comparable Size in an Infinitely Large Plate Under Uniaxial Tension

PTS on Embedded Rotated Cracks and Projection Rules

Tentative Thickness for Torispherical and Ellipsoidal ASME Section III Class 1 Heads

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Temporary Acceptance of Leaking Brazed Joints

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	O’sullivan, J. E. (Jim) Kevin, J. Hacker
Copyright Year	2018
Abstract	Minor leakage in brazed joints is occasionally detected in nuclear power plant Class 3 piping systems such as emergency service water cooling lines for equipment room and containment area coolers. Detection of such leakage often causes the system to be taken out of service for performance of repair/replacement activities to restore the piping to its original condition. This can lead to plant shutdowns or outage delays which are very costly, and often at increased safety risk, to accomplish the repairs. To avoid such costs and increased risk, a method is needed to establish structural adequacy of leaking brazed joints so that leakage can be controlled and monitored until the next planned opportunity for replacement of the brazed joint. During industry testing performed in the late 1950s, over 1200 lap joint tensile test specimens were brazed in a round-robin series of tests performed by 10 laboratories. The results of these tests showed that very little overlap is needed in a brazed lap joint to obtain full strength in the joint. In fact, braze metal shear strength exceeded piping collapse strength in all cases when the braze overlap was only 2.3 times the thickness of the members being brazed. Similar testing was performed by the U.S. Navy, and resulted in development of a NAVSEA document that established a conservative percentage of bond required for MIL F-1183 brazed fittings to prevent structural failure of a leaking brazed joint. This paper discusses an ASME Section XI Code Case that has been developed to incorporate the results of this testing into a methodology for temporary acceptance of leakage of brazed lap joints in copper, copper-nickel, and nickel-copper ASME Code Class 3 nuclear piping systems.
Sponsorship	Pressure Vessels and Piping Division
File Format	PDF
ISBN	9780791851593
DOI	10.1115/PVP2018-84779
Volume Number	Volume 1B: Codes and Standards
Conference Proceedings	ASME 2018 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2018-07-15
Publisher Place	Prague, Czech Republic
Access Restriction	Subscribed
Subject Keyword	Leakage Collapse Water Cooling Emergency response Metals Coolers Shear strength Risk Maintenance Piping systems Fittings Navy Structural failures Nickel Delays Safety Copper Nuclear power stations Pipes Asme standards Testing Containment
Content Type	Text
Resource Type	Article

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