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Title: Examination of stainless steel-clad Connecticut Yankee fuel assembly S004 after storage in borated water

A Connecticut Yankee fuel assembly (S004) was tested nondestructively and destructively. It was concluded that no obvious degradation of the 304L stainless steel-clad spent fuel from assembly S004 occurred during 5 y of storage in borated water. Furthermore, no obvious degradation due to the pool environment occurred on 304 stainless steel-clad rods in assemblies H07 and G11, which were stored for shorter periods but contained operationally induced cladding defects. The seam welds in the cladding on fuel rods from assembly S004, H07, and G11 were similar in that they showed a wrought microstructure with grains noticeably smaller than those in the cladding base metal. The end cap welds showed a dendritically cored structure, typical of rapidly quenched austenitic weld metal. Some intergranular melting may have occurred in the heat-affected zone (HAZ) in the cladding adjacent to the end cap welds in rods from assemblies S004 and H07. However, the weld areas did not show evidence of corrosion-induced degradation.
Authors:
; ; ; ; ;
Publication Date:
OSTI Identifier:
6793529
Report Number(s):
PNL-3828
ON: DE83000301
DOE Contract Number:
AC06-76RL01830
Resource Type:
Technical Report
Research Org:
Pacific Northwest Lab., Richland, WA (USA)
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; CONNECTICUT YANKEE REACTOR; SPENT FUEL ELEMENTS; DESTRUCTIVE TESTING; NONDESTRUCTIVE TESTING; BURNUP; CORROSION; EDDY CURRENT TESTING; EXPERIMENTAL DATA; FISSION PRODUCTS; FUEL ASSEMBLIES; FUEL RODS; GAMMA FUEL SCANNING; INSPECTION; MECHANICAL TESTS; METALLOGRAPHY; MICROSTRUCTURE; SPENT FUEL STORAGE; STAINLESS STEEL-304; ALLOYS; CHEMICAL REACTIONS; CHROMIUM ALLOYS; CHROMIUM STEELS; CHROMIUM-NICKEL STEELS; CORROSION RESISTANT ALLOYS; CRYSTAL STRUCTURE; DATA; ELECTROMAGNETIC TESTING; ENRICHED URANIUM REACTORS; FUEL ELEMENTS; FUEL SCANNING; GAMMA RADIOGRAPHY; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; INDUSTRIAL RADIOGRAPHY; INFORMATION; IRON ALLOYS; IRON BASE ALLOYS; ISOTOPES; MATERIALS; MATERIALS TESTING; NICKEL ALLOYS; NUMERICAL DATA; POWER REACTORS; PWR TYPE REACTORS; RADIOACTIVE MATERIALS; REACTOR COMPONENTS; REACTORS; STAINLESS STEELS; STEELS; STORAGE; TESTING; THERMAL REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS 210200* -- Power Reactors, Nonbreeding, Light-Water Moderated, Nonboiling Water Cooled