CHANNEL ANALYSIS OF OPERATION POWER FLUCTUATION FOR AP1000 REACTOR

ABSTRACT
CHANNEL ANALYSIS OF OPERATION POWER FLUCTUATION FOR AP1000
REACTOR. A study to analyze the influence of operation power fluctuations on channel
analysis of AP1000 reactor has been carried out. The calculation was conducted as channel
analysis, because sub-channel analysis could not be done by using COBRA-EN code for
transient or power as time function. The calculations found that hot channel at peak linear
power of 42.66 kW/m could represent hot sub-channel with peak linear power of 48.88
kW/m, fairly well. Between the two models, it was found that the peak center line fuel
temperature, the peak radial average fuel temperature and MDNBR were 5.54%, -2.83% and
6.35%, respectively. For calculations of operation power fluctuations the 12-3-3-3-0.5-0.5-
0.5-0.5-1 mode was used as a model for the hot channel using fuel and clad thermal
properties as temperature functions. The results showed that on full power, 50-percent
power and 110-percent power, the peak center line fuel temperatures were found to be
1697.25°C, 840.25°C and 1868.75°C, respectively. Moreover, the MDNBR were 2.65, 5.32
and 2.41, respectively. It was concluded that the reactor could be operated safely, while
operation power fluctuation occurred.
Keywords: channel analysis, operation power fluctuation, COBRA-EN, AP1000.
ABSTRAK
ANALISIS KANAL TERHADAP PENGARUH FLUKTUASI DAYA OPERASI PADA
REAKTOR AP1000.Telah dilakukan suatu penelitian untuk mengetahui pengaruh fluktuasi
daya operasi pada analisis kanal reaktor AP1000. Perhitungan dilakukan dengan analisis
kanal, karena pada kondisi transien atau daya fungsi waktu, analisis sub kanal tidak bisa
dilakukan dengan menggunakan kode COBRA-EN. Dari perhitungan diperoleh bahwa kanal
panas dengan puncak daya linier 42,66 kW/m mampu mewakili sub kanal panas dengan
puncak daya linier 48,88 kW/m dengan cukup baik. Antara kedua model, diperoleh
perbedaan untuk temperatur puncak sumbu bahan bakar, temperatur puncak rerata radial
bahan bakar dan MDNBR masing-masing sebesar 5,54%, -2,83% dan 6,35%. Pada
perhitungan fluktuasi daya dengan model 12-3-3-3-0.5-0.5-0.5-0.5-1, pada kanal panas
dengan sifat termal sebagai fungsi temperatur. Hasil analisis menunjukkan bahwa pada
daya penuh, daya 50-persen dan daya 110-persen diperoleh temperatur puncak sumbu
bahan bakar masing-masing sebesar 1697,25°C, 840,25°C dan 1868,75°C. Sedangkan
MDNBR masing-masing sebesar 2,65, 5,32 dan 2,41. Dari hasil tersebut dapat disimpulkan
bahwa reaktor dapat beroperasi dengan tetap selamat, ketika terjadi fluktuasi daya operasi.
Kata kunci: analisis kanal, fluktuasi daya operasi, COBRA-EN, AP1000.