Jurnal Pengembangan Energi Nuklir Vol. 19, No. 2, (2017) 103-111 103 Jurnal Pengembangan Energi Nuklir Laman Jurnal: jurnal.batan.go.id/index.php/jpen Determination of Concrete Vault Thickness of Near Surface Disposal for Radioactive Waste at Serpong Nuclear Area Sucipta*, Suhartono Center for Radioactive Waste Technology, BATAN, Kawasan PUSPIPTEK Serpong, Tangerang Selatan, Indonesia INFORMASI ARTIKEL ABSTRACT Riwayat Artikel: Diterima: 25 Agustus 2017 Diterima dalam bentuk revisi: 28 Februari 2018 Disetujui: 3 April 2018 Keywords: thickness vault disposal radioactive waste DETERMINATION OF CONCRETE VAULT THICKNESS OF NEAR SURFACE DISPOSAL FOR RADIOACTIVE WASTE AT SERPONG NUCLEAR AREA. In orderto fulfill the need of disposal for radioactive waste from small-scale nuclear power plant (NPP) operations, research, medical and industrial activities, it is necessary to prepare the near surface disposal facility (NSD). The NSD facility is also to support and complement the national facility of radioactive waste management services in Indonesia. Based on this reason BATAN will build a demonstration disposal facility in Serpong Nuclear Area (SNA). Demonstration disposal that will be built is Near Surface Disposal (NSD) type. Engineered vault for NSD is reinforced concrete. The calculations for determining the thickness of NSD concrete vault is based on the conceptual design as the result of the placement optimization of demonstration disposal that takes into account the inventory of radioactive waste and environmental geology conditions of the site at Serpong Nuclear Area. The thickness of the vault in this paper is focused on its ability to withstand radiation from stored waste so that workers or people near the disposal facility is safe with maximum radiation dose limit rate of 0.3 μSv / h. The calculation is performed with the aid of MicroShield 7:02 and Rad Pro Calculator Version 3:26 software. Based on the results of calculation, the dose rate at the outer surface of the vault should be 0.3 μSv/h, so it’s required walls made of concrete with density of 2.35 g/cm 3 and the thickness is 62.8 cm. ABSTRAK PENENTUAN TEBAL BETON VAULT PENYIMPANAN LESTARI LIMBAH RADIOAKTIF TIPE NEAR SURFACE DISPOSAL. Sebagai langkah antisipasi untuk pemenuhan kebutuhan penyimpanan lestari limbah radioaktif dari operasional Pembangkit Listrik Tenaga Nuklir (PLTN) skala kecil (Reaktor Daya Eksperimental = RDE), kegiatan riset, medis dan industri maka perlu dipersiapkan penyediaan fasilitas near surface disposal (NSD), yang juga sekaligus untuk melengkapi fasilitas nasional pelayanan pengelolaan limbah radioaktif di Indonesia. Dengan alasan tersebut maka BATAN akan membangun fasilitas disposal demo di Kawasan Nuklir Serpong (KNS). Penyimpanan lestari demo yang akan dibangun adalah tipe Near Surface Disposal (NSD). Engineered vault untuk NSD berupa dinding dari beton bertulang (reinforced concrete vault). Perhitungan untuk penentuan tebal beton dinding vault fasilitas NSD dilakukan berdasarkan konsep desain hasil optimasi penempatan penyimpanan lestari demo yang mempertimbangkan inventori limbah radioaktif dan kondisi geologi lingkungan tapak Kawasan Nuklir Serpong. Perhitungan ketebalan dinding vault dalam makalah ini difokuskan pada kemampuannya untuk menahan radiasi dari limbah yang disimpan agar supaya pekerja atau masyarakat yang berada di sekitar fasilitas penyimpanan lestari selamat dari bahaya radiasi yang batas maksimum laju dosisnya 0,3 µSv/jam. Perhitungan dilakukan dengan bantuan perangkat lunak (software) MicroShield 7.02 dan Rad Pro Calculator Version 3.26. Dari hasil perhitungan agar laju dosis di permukaan luar dinding vault menjadi 0,3 µSv/jam, diperlukan dinding yang terbuat dari beton dengan densitas 2.35 g/cm 3 setebal 62.8 cm. Kata kunci : ketebalan, vault, penyimpanan limbah lestari, limbah radioaktif © 2017 Jurnal Pengembangan Energi Nuklir. All rights reserved 1. INTRODUCTION As an anticipation step to fulfill the need of disposal for radioactive waste from small- scale nuclear power plant operations, research, medical and industrial activities, it is necessary to prepare the near surface disposal facility (NSD). The NSD facility is also to complement the national facility of radioactive waste management services in Indonesia. Most of the radioactive waste temporarily stored in interim storage (IS) of Center for Radioactive Waste Technology (CRWT) - BATAN is a low-intermediate level. In order to support and complement the radioactive waste management facilities in Indonesia, BATAN will build and operate the demonstration disposal facility in Serpong Nuclear Area (SNA). Demonstration disposal that will be built is Near Surface Disposal (NSD) type. *Correspondence author. E-mail: scipta@batan.go.id