Post-test examination of a pool boiler receiver

Dreshfield, R L; Moore, T J; Bartolotta, P A

Title: Post-test examination of a pool boiler receiver

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Abstract

A subscale pool boiler test apparatus to evaluate boiling stability developed a leak after being operated with boiling NaK for 791.4 hr at temperatures from 700 to 750 {degrees}C. The boiler was constructed using Inconel 625 with a type 304L stainless steel wick for the boiler and type 316 stainless steel for the condenser. The boiler assembly was metallurgically evaluated to determine the cause of the leak and to assess the effects of the NaK on the materials. It was found that the leak was caused by insufficient (about 30 percent) joint penetration in a butt joint. There was no general corrosion of the construction materials, but the room temperature ductility of the Inconel 625 was only about 6.5 percent. A crack in the heat affected zone of the Inconel 625 near the Inconel 625 to type 316 stainless steel butt joint was probably caused by excessive heat input. The crack was observed to have a zone depleted of iron at the crack surface and porosity below that zone. The mechanism of the iron depletion was not conclusively determined. 3 refs.

Authors:: Dreshfield, R L; Moore, T J; Bartolotta, P A

Publication Date:: Wed Apr 01 00:00:00 EST 1992

Research Org.:: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center

Sponsoring Org.:: USDOE; USDOE, Washington, DC (United States)

OSTI Identifier:: 5180433

Report Number(s):: DOE/NASA-33408-6; NASA-TM-105635
ON: DE92015983

DOE Contract Number:: AT04-85AL33408

Resource Type:: Technical Report

Country of Publication:: United States

Language:: English

Subject:: 14 SOLAR ENERGY; 36 MATERIALS SCIENCE; INCONEL 625; SOLAR RECEIVERS; PERFORMANCE TESTING; STAINLESS STEEL-304; STAINLESS STEEL-316; WELDED JOINTS; LEAKS; LIQUID METALS; MECHANICAL PROPERTIES; POTASSIUM BASE ALLOYS; SODIUM ALLOYS; SOLAR THERMAL CONVERSION; STIRLING ENGINES; TEMPERATURE RANGE 0400-1000 K; ALLOY-NI61CR22MO9NB4FE3; ALLOYS; ALUMINIUM ADDITIONS; ALUMINIUM ALLOYS; AUSTENITIC STEELS; CHROMIUM ALLOYS; CHROMIUM-NICKEL STEELS; CHROMIUM-NICKEL-MOLYBDENUM STEELS; CONVERSION; CORROSION RESISTANT ALLOYS; ELEMENTS; ENERGY CONVERSION; ENGINES; FLUIDS; HEAT ENGINES; HEAT RESIS; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; HIGH ALLOY STEELS; INCONEL ALLOYS; IRON ALLOYS; IRON BASE ALLOYS; JOINTS; LIQUIDS; MATERIALS; METALS; MOLYBDENUM ALLOYS; NICKEL ALLOYS; NICKEL BASE ALLOYS; NIOBIUM AL; POTASSIUM ALLOYS; SOLAR ENERGY CONVERSION; STAINLESS STEELS; STEEL-CR17NI12MO3; STEEL-CR19NI10; STEELS; TEMPERATURE RANGE; TESTING; 140700* - Solar Thermal Power Systems; 141000 - Solar Collectors & Concentrators; 360103 - Metals & Alloys- Mechanical Properties

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                    Dreshfield, R L, Moore, T J, and Bartolotta, P A. Post-test examination of a pool boiler receiver.  United States: N. p., 1992. 
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                    Dreshfield, R L, Moore, T J, & Bartolotta, P A. Post-test examination of a pool boiler receiver.  United States.

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                    Dreshfield, R L, Moore, T J, and Bartolotta, P A. 1992.  
        "Post-test examination of a pool boiler receiver".  United States.

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@article{osti_5180433,

  title        = {Post-test examination of a pool boiler receiver},

  author       = {Dreshfield, R L and Moore, T J and Bartolotta, P A},

  abstractNote = {A subscale pool boiler test apparatus to evaluate boiling stability developed a leak after being operated with boiling NaK for 791.4 hr at temperatures from 700 to 750 {degrees}C. The boiler was constructed using Inconel 625 with a type 304L stainless steel wick for the boiler and type 316 stainless steel for the condenser. The boiler assembly was metallurgically evaluated to determine the cause of the leak and to assess the effects of the NaK on the materials. It was found that the leak was caused by insufficient (about 30 percent) joint penetration in a butt joint. There was no general corrosion of the construction materials, but the room temperature ductility of the Inconel 625 was only about 6.5 percent. A crack in the heat affected zone of the Inconel 625 near the Inconel 625 to type 316 stainless steel butt joint was probably caused by excessive heat input. The crack was observed to have a zone depleted of iron at the crack surface and porosity below that zone. The mechanism of the iron depletion was not conclusively determined. 3 refs.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/5180433},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Wed Apr 01 00:00:00 EST 1992},

  month        = {Wed Apr 01 00:00:00 EST 1992}

}

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