PENGARUH VAC OFF GAS TERHADAP TINGKAT KONTAMINASI UDARA PADA INSTALASI PENGOLAHAN LIMBAH RADIOAKTIF DI PTLR BATAN SERPONG

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PENGARUH VAC OFF GAS TERHADAP TINGKAT KONTAMINASI UDARA PADA INSTALASI PENGOLAHAN LIMBAH RADIOAKTIF DI PTLR BATAN SERPONG. Telah dilakukan pengukuran tingkat kontaminasi udara untuk mengetahui distribusinya dalam gedung IPLR. Sampel diambil di zona 1, zona 2 dan zona 3 dengan variasi waktu pada kondisi VAC-Off Gas hidup dan mati. Hasil pencuplikan udara diukur dengan pencacah  /  aktivitas rendah. Dari hasil penelitian ini diketahui bahwa semakin lama VAC dalam kondisi mati, semakin tinggi konsentrasi kontaminan di dalam gedung. Untuk kondisi VAC mati 64 jam (libur normal), kontaminasi udara tertinggi mencapai 3,6 kali nilai batas ambang. Sedangkan untuk kasus 88 jam gedung tanpa operasi VAC, konsentrasi kontaminan mencapai 5 kali nilai batas yang diijinkan. Kontaminasi udara turun menjadi di bawah nilai ambang, setelah VAC hidup selama 0,8 jam. Sedangkan nilai konsentrasi kontaminan sama dengan udara luar dicapai setelah VAC dioperasikan selama 1 jam.

INFLUENCE OF VAC OFF GAS TO AIR CONTAMINATION IN RADIOACTIVE WASTE INSTALATION AT PTLR BATAN SERPONG. Measurement of air contamination has been conducted to evaluate its distribution in the building of radioactive waste treatment installation. Samples were taken in various time from zone-1, zone-2, and zone-3 of the building when VAC off gas system was on and off. The samples were taken from air in the building and measured using  /  activity counter. The research result show that as VAC off gas turned off then gas concentration will be increasing. When VAC was not operated in 64 hours (weekend holidays) air contamination reached 3,6 time higher than its permission limit. More over, in 88 hours without VAC operation gas concentration reached 5 times higher than permitted limit. Air contamination reduced to below permitted limit after 0,8 hour of VAC operation and it reached same level with gas concentration in external air after 1 hour of VAC operation.