×

Welcome To Our Institute


The National Radioactive Waste Disposal Institute of South Africa (NRWDI)

A South African State-Owned Entity Dedicated to Professional Nuclear Waste Management and Disposal Services in terms of the National Radioactive Waste Disposal Institute Act, No 53 2008.


Our Head Office
Elias Motsoaledi Street Extension
R104 Pelindaba, Brits Magisterial District
Madibeng Municipality,0240
Telephone: +27 (12) 305 3222
Facsimile +27 (12) 305 3200

Dedicated to Professional Nuclear Waste Management and Disposal Services

Image

Managing Radioactive Waste in South Africa


Repository Safety Design


According to the overall objective of radioactive waste management, human beings and the environment shall be protected from current and future impacts of waste disposal practises. To this end, the Vaalputs site has been selected by means of a regional survey and further detailed suitability and characterisation studies in accordance with internationally acceptable selection criteria.

A repository isolation concept is required that provides effective isolation from the biosphere for the duration of the operational and institutional control period, after closure of the repository. The current disposal concept for the LLW is near surface disposal consisting of near surface trenches located in the region above the groundwater table.

Widget Image

After placing of nuclear waste drums, and covering drums with clay and done with capping process. A natural flora is restored.

For Vaalputs reliance is placed on the multi-barrier systems approach where the site characteristics together with the waste packages all contribute to the isolation of the waste from the environment for time periods sufficiently long for radio nuclides to decay to acceptable levels.


The long-term safety performance of the repository takes cognisance of the defence in depth principle whereby the multiple barrier system (MBS) approach is incorporated. The MBS consists of two main components, i.e., the natural barrier system (NBS) and the engineered (man-made) barrier system (EBS). The quality of these barrier systems influences the long-term safety performance of the facility.


The institutional control period commences after repository closure and is assumed to be three hundred years for the Vaalputs near surface repository given the current operational constraints and source term.



The repository systems have characteristics that

  • Provide a high level of operational and long-term safety.
  • Allow a convincing demonstration of compliance with performance standards, thus ensuring public confidence in the disposal system.
  • Ensure safety without placing excessive financial burdens on the current and future generations.
  • Prevents or substantially delays movement of water or radionuclides toward the accessible environment.
  • The repository system design incorporates the near field, geosphere, biosphere at Vaalputs as well as the manufacture and conditioning of waste packages at the predisposal operator’s site.

The Vaalputs facility complies with safety requirements prescribed by the NNR, that inter alia:

  • Specify the maximum potential exposure to the highest exposed group of individuals amongst the public.
  • Mandate the use of the “As Low as Reasonably Achievable” (ALARA) principle.
  • Require the “defence in depth” principle to be implemented.
  • Comply with international acceptable risk.
  • Embracing the IAEA safety principles, fundamentals and guidelines.


500x500