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In-Tube Steam Condensation in the Presence of Air Under Transient Conditions (NUREG/IA-0210)On this page: Download complete document The following links on this page are to documents in Adobe Portable Document Format (PDF). See our Plugins, Viewers, and Other Tools page for more information. For successful viewing of PDF documents on our site please be sure to use the latest version of Adobe. Publication InformationDate Published: May 2007 Prepared by: Turkish Atomic Energy Authority O. Yesin M.B. Rubin, NRC Project Manager Office of Nuclear Regulatory Research Prepared as part of Published by AbstractThe experimental investigation of condensation of pure vapor and air/vapor mixture in case of loss of coolant (feed-water) to the secondary side of a condenser imposes a special case since boil-off rate at the secondary side directly affects condensation process inside a condenser tube. The motivation for this special case comes from the experiment performed at the UMCP 2X4 integral test loop at the University of Maryland, which is a 1/500 scaled test facility of a PWR with once-through type steam generators, concerning loss of residual heat removal system during operation with reduced coolant inventory. The first phase of this type the experiment performed at the UMCP 2X4 test facility comprises the boiler-condenser mode (BCM) of operation during which one steam generator is active. However when the steam generator becomes inactive due to loss of feed-water (LOFW) to the secondary side (second phase), heat transfer from primary to secondary side that is mainly by condensation degrades and system pressure escalates. To address the issue outlined here, two experiments were performed at the METU-CTF, including the first phase (BCM) and second phase (LOFW) of the scenario: pure steam and air/steam mixture. These transients showed that the system pressurization is almost linear by time at constant vaporization rate inside the boiler. Similar observation was made for the results of UMCP 2X4 experiment. Besides this, the METU-CTF results show that vapor suction rate, effective condensation length and overall heat transfer rate are the function of boil-off rate of coolant and air mass fraction, as expected. In this report, the results of experiments performed at the METU-CTF concerning in-tube
steam condensation at BCM steady state condition and transient (LOFW) are presented, for
both pure steam and air/steam mixture cases. The results of RELAP5 simulation are also
discussed. Although given in NUREG/IA-0184, the report on in-tube steam condensation in
the presence of air at steady-state condition, a brief description of the METU-CTF test facility PAPERWORK REDUCTION ACT STATEMENTS This NUREG does not contain information collection requirements and, therefore, is not subject to the requirements of the Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.). Public Protection Notification The NRC may not conduct or sponsor, and a person is not required to respond to, a request for information or an information collection requirement unless the requesting document displays a currently valid OMB control number. |
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