scholarly journals Rancang Bangun Heater Element Segment pada Rangkaian Sistem Reactor Cavity Cooling RDNK

2021 ◽  
Vol 23 (1) ◽  
pp. 19
Author(s):  
Rahayu Kusumastuti Kusumastuti ◽  
Dedy Haryanto ◽  
Giarno Giarno ◽  
Bambang Heru ◽  
Ainur Rosidi ◽  
...  
Keyword(s):  
High Temperature ◽  
Pressure Vessel ◽  
Cooling System ◽  
Reactor Pressure Vessel ◽  
Heater Element ◽  
Cavity Cooling ◽  
Reactor Pressure

RANCANG BANGUN HEATER ELEMENT SEGMENT PADA RANGKAIAN SISTEM REACTOR CAVITY COOLING RDNK. Proses pendinginan secara pasif menjadi perhatian khusus sejak kecelakaan PLTN Fukushima dan TMI-2, kecelakaan tersebut diakibatkan oleh gagalnya sistem pendingin aktif dimana pompa tidak berfungsi. Kemudian, aliran sirkulasi alam sebagai prinsip kerja sistem pendingin pasif juga digunakan pada model pendinginan di celah antara dinding luar Reactor Pressure Vessel (RPV) reactor High Temperature Gass Cooled Reactor (HTGR) dan beton penopang RPV. Riset terkait reactor cavity cooling system berbasis pendingin pasif dilakukan dengan membuat Untai Uji Reactor Cavity Cooling System-Reaktor Daya Non Komersial (RCCS-RDNK), namun saat dilakukan komisioning fungsi pemanasannya tidak optimal, temperatur yang ingin dicapai yaitu 300oC – 400oC pada permukaan simulator RPV HTGR tidak tercapai, sehingga dilakukan modifikasi pada sistem pemanas dengan heater element segments (HES) berbasis proses radiasi. Tujuan penelitian adalah untuk melakukan analisis pada pengujian pemanasan HES hasil konstruksi hingga mencapai temperatur optimal. Metode eksperimen dilakukan dengan menghidupkan heater dan merekam perubahan temperatur pada titik pengukuran di bagian permukaan insulator brick (BRICK), permukaan dalam RPV (RPVD), permukaan luar RPV (RPVL) dan udara luar. Hasil pengujian menunjukkan, secara umum capaian maksimal temperatur pada bagian permukaan RPV sekitar 400oC, dengan temperatur permukaan brick sekitar 700oC. Hal ini menunjukkan bahwa, konstruksi pemanas HES dapat beroperasi optimal dan memenuhi kriteria simulasi pendingin pada RCCS HTGR.

Optimizing Maintenance Strategy of a Reactor Pressure Vessel Using 3D-CFD and FEM Based Probabilistic Pressurized Thermal Shock Analysis

2017 ◽  
Author(s):  
Xiaoyong Ruan ◽  
Toshiki Nakasuji ◽  
Kazunori Morishita
Keyword(s):  
Spatial Distribution ◽  
Thermal Shock ◽  
Pressure Vessel ◽  
Nuclear Power ◽  
Structural Integrity ◽  
Cooling System ◽  
Reactor Pressure Vessel ◽  
Pressurized Thermal Shock ◽  
Core Cooling ◽  
Reactor Pressure

The structural integrity of a reactor pressure vessel (RPV) is important for the safety of a nuclear power plant. When the emergency core cooling system (ECCS) is operated and the coolant water is injected into the RPV due to a loss-of-coolant accident (LOCA), the pressurized thermal shock (PTS) loading takes place. With the neutron irradiation, PTS loading may lead a RPV to fracture. Therefore, it is necessary to evaluate the performance of RPV during PTS loading to keep the reactor safety. In the present study, optimization of RPV maintenance is considered, where two different attempts are made to investigate the RPV integrity during PTS loading by employing the deterministic and probabilistic methodologies. For the deterministic integrity evaluation, 3D-CFD and finite element method (FEM) simulations are performed, and stress intensity factors (SIFs) are obtained as a function of crack position inside the RPV. As to the probabilistic integrity evaluation, on the other hand, a more accurate spatial distribution of SIF on the RPV is calculated. By comparing the distribution thus obtained with the fracture toughness included as a part of the master curve, the dependence of fracture probabilities on the position inside the RPV is obtained. Using the spatial distribution of fracture probabilities in RPV, the priority of the inspection and maintenance is finally discussed.

Development of 1000 MWe Advanced Boiling Water Reactor

2006 ◽  
Author(s):  
Kazuo Hisajima ◽  
Ken Uchida ◽  
Keiji Matsumoto ◽  
Koichi Kondo ◽  
Shigeki Yokoyama ◽  
...  
Keyword(s):  
Pressure Vessel ◽  
Cooling System ◽  
Reactor Pressure Vessel ◽  
Boiling Water ◽  
Boiling Water Reactor ◽  
Water Reactor ◽  
Decay Heat ◽  
Containment Vessel ◽  
Main Steam ◽  
Reactor Pressure

1000 MWe Advanced Boiling Water Reactor has only two main steam lines and six reactor internal pumps, whereas 1350 MWe ABWR has four main steam lines and ten reactor internal pumps. In order to confirm how the differences affect hydrodynamic conditions in the dome and lower plenum of the reactor pressure vessel, fluid analyses have been performed. The results indicate that there is not substantial difference between 1000 MWe ABWR and 1350 MWe ABWR. The primary containment vessel of the ABWR consists of the drywell and suppression chamber. The suppression chamber stores water to suppress pressure increase in the primary containment vessel and to be used as the source of water for the emergency core cooling system following a loss-of-coolant accident. Because the reactor pressure vessel of 1000 MWe ABWR is smaller than that of 1350 MWe ABWR, there is room to reduce the size of the primary containment vessel. It has been confirmed feasible to reduce inner diameter of the primary containment vessel from 29m of 1350 MWe ABWR to 26.5m. From an economic viewpoint, a shorter outage that results in higher availability of the plant is preferable. In order to achieve 20-day outage that results in 97% of availability, improvement of the systems for removal of decay heat is introduced that enables to stop all the safety-related decay heat removal systems except at the beginning of an outage.

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