# The Railways and Other Guided Transport Systems (Safety) Regulations 2006, Paragraph 5: Principles for the assessment of achievement of NRVs and CSTs


The following principles apply for assessing achievement of NRVs and CSTs—
(a) for each risk category for which the NRV is equal to or lower than the corresponding CST, the achievement of the NRV also automatically implies the achievement of the CST;
(b) the assessment of achievement of the NRV must be carried out according to the procedure described in paragraph 8 and the NRV represents the maximum tolerable level of the risk to which it refers, without prejudice to provisions of the range of tolerance laid down in paragraph 10;
(c) for each risk category for which the NRV is higher than the corresponding CST, the CST represents the maximum tolerable level of the risk to which it refers;
(d) the assessment of achievement is to be carried out in compliance with the requirements deriving from the impact assessment.

---
Source: https://www.legislation.gov.uk/uksi/2006/599/schedule/11/paragraph/5 (the official version)
Page: https://openlegislation.uk/railways-and-other-guided-transport-systems-safety-regulations-2006/schedule-11/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.