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Title: Pressure Rise in Run6 and Related Issues

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Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider
Sponsoring Org.:
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Report Number(s):
DOE Contract Number:
Resource Type:
Technical Report
Country of Publication:
United States
43; relativistic heavy ion collider

Citation Formats

Zhang S. Y., Hseuh, H.C., Montag, C., Ptitsyn, V., and Trbojevic, D.. Pressure Rise in Run6 and Related Issues. United States: N. p., 2006. Web. doi:10.2172/1061824.
Zhang S. Y., Hseuh, H.C., Montag, C., Ptitsyn, V., & Trbojevic, D.. Pressure Rise in Run6 and Related Issues. United States. doi:10.2172/1061824.
Zhang S. Y., Hseuh, H.C., Montag, C., Ptitsyn, V., and Trbojevic, D.. Sat . "Pressure Rise in Run6 and Related Issues". United States. doi:10.2172/1061824.
title = {Pressure Rise in Run6 and Related Issues},
author = {Zhang S. Y. and Hseuh, H.C. and Montag, C. and Ptitsyn, V. and Trbojevic, D.},
abstractNote = {},
doi = {10.2172/1061824},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 2006},
month = {Sat Apr 01 00:00:00 EST 2006}

Technical Report:

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  • Rosemount pressure transmitters are extensively used in both safety and non-safety applications in US nuclear power plants. They are used to measure pressure, flow, and water level. Rosemount pressure transmitter models 1151, 1152, 1153A, 1153, and 1154 use a fill oil to hydraulically transmit process pressure exerted on outer isolating diaphragms to internal diaphragms. The resulting deflection of the internal diaphragms changes the distance between them and a central diaphragm separating the transmitter interior into two volumes. The change in distance is measured as a change in electrical capacitance between the isolating diaphragms and the central diaphragm and can bemore » related to differential pressure. The fill oil also functions as a dielectric. It has been well established that this fill oil can potentially leak over time, decreasing transmitter accuracy and increasing transmitter response time. Ultimately, the transmitter can fail. An extensive effort has been expended by the nuclear power industry collectively to analyze this issue and develop technically sound and reasonable requirements to mitigate the effects of oil loss in Rosemount pressure transmitters. Despite this, technical concerns have still been raised regarding the technical validity of the past analyses of this problem and its scope. In May 1993, the NRC created an internal group to comprehensively review the Rosemount issue and the NRC`s action in addressing it to ensure that all available technical information has been considered. Because this issue remains of active technical interest and because the past work on this subject has been done by many different groups and organizations, EPRI has prepared this report to thoroughly document the current technical understanding of this issue, to perform additional analysis, and to identify any appropriate additional technical research activities regarding oil loss in Rosemount pressure transmitters.« less
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