"This standard provides criteria and guidelines for assessing permanent ground deformation (PGD) hazard due to tectonic surface fault rupture and deformation at nuclear facilities. Specifically@ the purpose of this standard is to provide an outline of procedures and methods for performing probabilistic fault displacement hazard analysis (PFDHA) for surface rupture hazard and probabilistic tectonic deformation hazard analysis (PTDHA) for surface deformation due to displacements along blind (buried) faults. Probabilistic approaches for assessing surface fault displacement and tectonic deformation hazard are relatively new; thus@ criteria and guidelines have not been defined previously. PGD due to fault rupture is a potential hazard for nuclear facilities founded across or near a fault. In this standard@ only coseismic PGD hazard related to movement on crustal faults is addressed. Deformation in the form of creep or afterslip and uplift and subsidence during subduction zone earthquakes is not addressed. Non-tectonic deformation@ as described in Section 5.1@ is not addressed in this standard. Methods to investigate and characterize surface fault displacement and tectonic deformation hazards have advanced significantly@ justifying a new standard. Specifically@ it is possible to quantify the expected PGD from surface or near-surface fault rupture due to advances in geologic@ geomorphic@ and paleoseismic techniques used to identify and quantify the location@ rate@ and amount of Quaternary deformation as well as empirical observations of PGD resulting from historical earthquakes. Modern engineering practice has developed sufficiently such that the design or retrofit of structures@ systems@ or components (SSCs) might be able to accommodate or resist certain amounts of earthquake-induced surface rupture or other types of ground deformation. Therefore@ characterization of PGD is a critical step during the siting and design of engineered facilities that are to be located in areas where such deformation may occur. This standard replaces ANSI/ANS-2.7-1982 (withdrawn)@ ""Criteria and Guidelines for Assessing Capability for Surface Faulting at Nuclear Power Plant Sites@"" [1]1 which is obsolete because of changes in technical methods@ public concerns@ and regulatory programs. This new standard includes updated information to make it useful for siting/licensing nuclear facilities in the U.S. This standard does not specify methods for estimating the probability of other seismically induced hazards such as soil liquefaction@ soil settlement@ landsliding@ and earthquake-induced flooding. These hazards may be applicable for certain sites and need to be evaluated and included in design requirements. This standard is one of a series of national standards designed to provide criteria and guidelines to promote uniform and effective assessment of seismic hazards at nuclear facilities. These hazards must be properly identified and characterized commensurate with the level of risk and design requirements associated with each nuclear facility@ as specified in ANSI/ANS-2.26-2004 (R2010)@ ""Categorization of Nuclear Facility Structures@ Systems@ and Components for Seismic Design"" [2]. As defined in ANSI/ANS-2.26-2004 (R2010) [2]@ a nuclear facility is a facility that stores@ processes@ tests@ or fabricates radioactive materials in such form and quantity that a significant nuclear hazard to the workers@ to the off-site public@ or to the environment may exist. These include@ but are not limited to@ commercial nuclear power plants@ nuclear fuel manufacturing facilities@ nuclear material waste processing@ storage@ fabrication@ and reprocessing facilities@ uranium enrichment facilities@ tritium production and handling facilities@ and radioactive materials laboratories. Additional criteria may be specified by an applicable regulatory authority such as the U.S. Nuclear Regulatory Commission (NRC). The guidelines and requirements provided in this standard are applicable for the design and evaluation of Seismic Design Category (SDC)-3@ SDC-4@ and SDC-5 facilities. These can also be applied to SDC-1 and SDC-2 or other non-U.S. Department of Energy (DOE) facilities@ if@ for safety@ economic@ or other reasons@ a site-specific seismic hazard evaluation is necessary. Two complementary standards describe procedures for performing site characterization and assessing seismic hazards: ANSI/ANS-2.27-2008@ ""Criteria for Investigations of Nuclear Facility Sites for Seismic Hazard Assessments@"" [3] and ANSI/ANS-2.29-2008@ ""Probabilistic Seismic Hazard Analysis"" [4]. ANSI/ANS-2.27-2008 [3] provides criteria and guidelines for conducting geological@ seismological@ and geotechnical investigations needed to provide information to support the following: (1) seismic source characterization input to a probabilistic seismic hazard analysis (PSHA); (2) evaluation of surface fault rupture hazard; (3) site response analysis; and (4) evaluation of seismic-induced ground failure hazard. ANSI/ANS-2.29-2008 [4] outlines standard criteria and procedures to perform a PSHA for earthquake ground shaking hazard at nuclear facilities. Appropriate criteria and guidelines are outlined herein to ensure that the current state-of-the-art methodology is being used for completing either PFDHA or PTDHA. The selection of specific techniques and level of detail required to assess seismic-induced hazards are dependent on both the nature of the nuclear facility (i.e.@ SDC)@ as defined by ANSI/ANS-2.26-2004 (R2010) [2]@ and sitespecific conditions. Execution of this standard requires two prior conditions: (1) defining the seismic design category for the facility; and (2) executing a site characterization program following the requirements and guidelines given in ANSI/ANS-2.27-2008 [3] and in Section 5 of this standard. 1 Numbers in brackets refer to corresponding numbers in Sec. 11@ ""References."""