As defined in NHB 5300. 41(1D-2), "Loss of the capability to provide the level of system performance required for normal or emergency operations" (NSTS 22254)
American Society of Safety Engineers (ASSE) Dictionary of Terms Used in the Safety Profession. SSDC: System Safety Development Center Glossary of SSDC, Glossary - Wiley Online Library, USA 2000 (Published Online 2005). http://onlinelibrary.wiley.com/doi/10. 1002/0471662542. gloss/pdf, (Sfty Eng - Amer) {629}