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붕소주입탱크 제거에 따른 원전 격납건물 건전성 예비 평가
조종영(Jong Young Jo),송동수(Dong Soo Song),변충섭(Choong Sub Byun) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Boron Injection Tank(BIT) is a component of the Safety Injection System, which its sole function is to provide concentrated boric acid to the reactor coolant in order to mitigate the consequences of postulated Main Steamline Break accidents. Although BIT plays an important role in mitigating the accident, high concentration of 20,000ppm causes valve leakage, clog of precipitation and continuous heat tracing have to be provided. For the removal of BIT, benchmarking analysis is performed between COPATTA code used in Final Safety Analysis Report and CONTEMPT code to be used this study. CONTEMPT is well compatible with COPATTA. The sensitivity study for integrity is performed for the three cases of full Double Ended Rupture at 102% power with Diesel Generator failure, 3.4㎥ & 2400ppm BIT, 3.4㎥ & 0ppm BIT and no volume of BIT. The results show that the deactivation of BIT is plausible for success.
BIT 제거시 내환경검증(EQ) 안전해석 결과에 미치는 영향 평가
송동수(Dong Soo Song),변충섭(Choong Sub Byun),조종영(Jong Young Jo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Boron Injection Tank(BIT) is a component of the Safety Injection System, which its sole function is to provide concentrated boric acid to the reactor coolant in order to mitigate the consequences of postulated Main Steam line Break accidents. Although BIT plays an important role in mitigating the accident, high concentration of 20,000ppm causes valve leakage, clog of precipitation and continuous heat tracing have to be provided. For BIT removal, it is necessary to evaluate the effect on current environmental qualification(EQ) safety analysis results in point of containment pressure and temperature envelope for the Kori NPP 2 and Kori 3,4. It is found that the present EQ envelope is still valid even in the condition of deactivation of BIT.