Endurance tests of valves with cobalt-free hardfacing alloys: PWR phase. Final report

Technical Report · Fri May 01 04:00:00 EDT 1992

OSTI ID:10158475

Murphy, E V; Inglis, I ^[1]

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1. Atomic Energy of Canada Ltd., Mississauga, ON (Canada)

Atomic Energy of Canada Limited (AECL) is conducting endurance tests on valves hard-faced with four cobalt-free alloys. The first phase of the program, in which PWR primary heat transport conditions were simulated in AECL`s valve test loop, has been completed. The candidate alloys are NOREM 01, NOREM 04, EB 5183 and EVERIT 50. One valve with Stellite 6 trim served as the standard. Prior to loop testing, a baseline inaugural inspection was performed. During testing the loop was shutdown at approximately 500 cycle intervals, and the valves were disassembled for examination. The examinations included seat leak tests, profilometry, nondestructive inspection and finally destructive examination. Corrosion coupons in the loop were used to monitor any material loss due solely to corrosion mechanisms. This report summarizes the final examination results and discusses the relative performance of the candidate alloys. The results indicate that, based upon the sliding wear damage assessment and seat leakage test results, all the candidate alloys perform better than the Stellite 6 control sample. On the same basis, NOREM 04 and EB 5183 are the best of the candidate alloys, although there are only minor differences in performance among the four alloys.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (United States); Atomic Energy of Canada Ltd., Mississauga, ON (Canada)
• Sponsoring Organization: Electric Power Research Inst., Palo Alto, CA (United States)
• OSTI ID: 10158475
• Report Number(s): EPRI-TR--100601; ON: UN92016770
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
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36 MATERIALS SCIENCE
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CHEMICAL ANALYSIS
CHROMIUM BASE ALLOYS
COATINGS
COBALT
CORROSION
CORROSION AND EROSION
EROSION
MATERIALS TESTING
METALLOGRAPHY
MICROSTRUCTURE
POWER REACTORS
NONBREEDING
LIGHT-WATER MODERATED
NONBOILING WATER COOLED
PWR TYPE REACTORS
VALVES