Accession Number:

AD0609565

Title:

YANKEE REACTOR PRESSURE VESSEL SURVEILLANCE: EVALUATION OF SPECIMENS EXPOSED DURING THE SECOND CORE,

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Report Date:

1964-11-24

Pagination or Media Count:

19.0

Abstract:

Pressure vessel surveillance specimens from four capsules in accelerated irradiation positions of the Yankee Atomic Power Reactor have been tested. In spite of the fact that the four capsules were located in physically identical positions about the fuel core, they were subject to widely different neutron exposures 1 Mev. The Charpy-V transition temperature increase of the Yankee pressure vessel steel, which was irradiated together with a reference steel of the same nominal composition in the same capsules, was somewhat larger than the increase of the reference steel. The data from the reference steel followed closely the trend line of transition temperature increase versus total neutron exposure previously established by NRL for 540F irradiations, but that for the Yankee vessel steel was displaced almost 100F higher than the reference steel. Postirradiation annealing was beneficial for the three heat treatment conditions studied, and, in one case, essentially complete recovery of initial properties was observed. The study demonstrated the usefulness of accurate dosimetry data for each survellance specimen and the importance of measurements of the neutron dosage to which the monitored reactor component is exposed. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE