Thermosiphon-Based Passive Heat Removal System for Simultaneous Cooldown of Reactor and Pressurizer

Sviridenko, Igor I.; Shevielov, Dmitriy V.

doi:10.1615/interjenercleanenv.2013006206

Cited by 1 publication

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“…4) that decrease immediately after the actuation of the PRHRS-R. During the whole time of PRHRS-R operation, suffi cient subcooling margin in the core is maintained as well as safe fuel cladding temperatures. In addition, the PRHRS-R also provides cooldown of the steam generators (Sviridenko and Shevielov, 2012).…”

Section: Results Of Analytical Modelingmentioning

confidence: 99%

“…4). Boron injection into the primary circuit is maintaining subcriticality, helps to recover water level in the pressurizer and keeps the core fl ooded along the entire transient (Sviridenko and Shevielov, 2012).…”

Section: Results Of Analytical Modelingmentioning

confidence: 99%

“…The specifi c feature of the proposed PRHRS is that it is built based on evaporation-condensation closed cycle units -two-phase thermosiphons (TPTS) (Sviridenko, 2008a). The TPTS, providing heat transfer from the primary circuit to the intermediate circuit, serve as an additional barrier for potential release of radioactivity outside the containment boundary, thus increasing the safety of the reactor installation in the case of intercircuit leaks (Sviridenko and Shevielov, 2012). Calculations performed on RELAP5/Mod3.4 show high reliability of the thermosiphon-based PRHRS system.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Passive Residual Heat Removal System for the Wwer With Thermosiphon Heat Exchanging Equipment

Sviridenko

Shevelyov

Polyakov

et al. 2015

Inter J Ener Clean Env

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The paper describes the operation of an autonomous passive residual heat removal system (PRHRS) for the WWER-1000 reactor design. The basic feature of the PRHRS is the heat removal from the primary circuit through thermosiphon-based heat exchangers. The layout of the PRHRS and its composition are presented. The results of analytical modeling of the PRHRS with RELAP5/ Mod3.4 code are given. The analytical characteristics of the system operation with removal of the residual heat from the reactor's primary circuit proved the high effi ciency and reliability of the PRHRS in blackout transient. The functioning of the system for heat removal to the external air was compared with that to water. When external water is used as the heat repository, an antifreezing thermal protection is provided for low-temperature conditions. The calculations present the results of modeling the PRHRS emergency heat removal from a WWER-1000 reactor in the case of a small noncompensible LOCA coinciding with ECCS HA isolation failure. The infl uence of the ECCS HA isolation failure on the PRHRS effi ciency has been assessed, along with optimization of the PRHRS composition with the purpose of mitigation of the infl uence of the injection of noncondensing gases into the primary circuit. The operational conditions providing effi cient long-term removal of residual heat, which is indicated by the primary cooldown and depressurization along with fuel integrity, were examined.

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Section: Results Of Analytical Modelingmentioning

confidence: 99%

Section: Results Of Analytical Modelingmentioning

confidence: 99%