3.48. For geological disposal and for the disposal of intermediate level radioactive waste, the passive safety features (barriers) have to be sufficiently robust so as not to require repair or upgrading. The long term safety of a disposal facility for radioactive waste is required not to be dependent on active institutional control (see Requirement 22). For near surface disposal facilities, including those for radioactive waste from the mining and processing of minerals, measures for surveillance and control of the disposal facility might be instituted. These measures might include restrictions on access by people and animals, inspection of physical conditions, retention of appropriate maintenance capabilities, and surveillance and monitoring as a method of checking whether performance is as specified (i.e. checking for degradation). The intent of surveillance and monitoring is not to measure radiological parameters but to ensure the continuing fulfilment of safety functions.