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Title: Soft Failure Localization During Commissioning Testing and Lightpath Operation

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1407839
Grant/Contract Number:
SC0016700
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Optical Communications and Networking
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Related Information: CHORUS Timestamp: 2017-11-07 10:34:36; Journal ID: ISSN 1943-0620
Publisher:
Optical Society of America
Country of Publication:
Country unknown/Code not available
Language:
English

Citation Formats

Vela, A. P., Shariati, B., Ruiz, M., Cugini, F., Castro, A., Lu, H., Proietti, R., Comellas, J., Castoldi, P., Yoo, S. J. B., and Velasco, L. Soft Failure Localization During Commissioning Testing and Lightpath Operation. Country unknown/Code not available: N. p., 2017. Web. doi:10.1364/JOCN.10.000A27.
Vela, A. P., Shariati, B., Ruiz, M., Cugini, F., Castro, A., Lu, H., Proietti, R., Comellas, J., Castoldi, P., Yoo, S. J. B., & Velasco, L. Soft Failure Localization During Commissioning Testing and Lightpath Operation. Country unknown/Code not available. doi:10.1364/JOCN.10.000A27.
Vela, A. P., Shariati, B., Ruiz, M., Cugini, F., Castro, A., Lu, H., Proietti, R., Comellas, J., Castoldi, P., Yoo, S. J. B., and Velasco, L. 2017. "Soft Failure Localization During Commissioning Testing and Lightpath Operation". Country unknown/Code not available. doi:10.1364/JOCN.10.000A27.
@article{osti_1407839,
title = {Soft Failure Localization During Commissioning Testing and Lightpath Operation},
author = {Vela, A. P. and Shariati, B. and Ruiz, M. and Cugini, F. and Castro, A. and Lu, H. and Proietti, R. and Comellas, J. and Castoldi, P. and Yoo, S. J. B. and Velasco, L.},
abstractNote = {},
doi = {10.1364/JOCN.10.000A27},
journal = {Journal of Optical Communications and Networking},
number = 1,
volume = 10,
place = {Country unknown/Code not available},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 9, 2018
Publisher's Accepted Manuscript

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  • Testing, commissioning, and initial operation methods and procedures are described of some of the over 350 test schedules made. Major items are selected and described in fairly broad outline for a few of the test schedules. Some of the tests described are: sphere pressure test, primary liquid metal pipe weld tests, maintenance flask dry testing, and wet testing of the removal and replacement of equipment or charge and discharge operations. Other topics discussed are welding procedures, installation and calibration of outer and inner rotating shield and associated equipment including control rods, sodium-potassium filling, and critical assembly charging. A program involvingmore » operation of the reactor at low powers is also discussed. (N.W.R.)« less
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  • It is well known that, when a higher-melting-point solid metal is exposed to the combination of a specific lower-melting-point liquid metal and stress, severe embrittlement can occur. This is known as liquid metal embrittlement (LME). Refractory metals with high melting points and good workability, such as the Group VB metals (V, Nb, and Ta) have been used to construct molds for casting other metals that have low melting points. One of these low-melting-point metals is U, which is used in nuclear power reactors as fuel. However, it was previously reported that severe degradation occurred when Ta was exposed to liquidmore » U. The kinetics of the penetration of U into Ta under stress-free conditions were studied. It was found that, between 1433 K and 1623 K, despite the low solubility of U in Ta, the Ta matrix recrystallized into elongated grains, and U penetrated between the grains. The penetrated U existed in front of the transformed grains as a separate layer and along grain boundaries. For conditions in which stresses exist, it is expected that the penetration of liquid uranium could be further accelerated and thus embrittle the Ta matrix. There is no detailed study about the LME mechanisms of Group VB metals in liquid U. The authors have initiated a research activity to study the mechanisms of embrittlement of Nb and Ta by liquid uranium. Their initial results, as reported in this paper, indicate a significant difference between Nb and Ta when exposed to liquid U and subjected to tensile stress.« less
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