View source for CEUS-SSC

==Project Updates==
The CEUS-SSC website was activated in January 2012. Provision was made when constructing the website to incorporate updates which become available. This site contains background information from the CEUS SSC project that includes the report and a section for updates. Website updates shall fall under two categories:

*'''Category 1''': Correction to fix a parameter and bookkeeping changes which may require errata sheets. Bookkeeping changes are minor changes to correct clear mistakes in the CEUS-SSC model and report. Typos and mis-labeled figures are other examples. No Senior Seismic Hazard Analysis Committee (SSHAC) assessment process is required for this category.
::*[[Media:Category_1_Update_2012.pdf|Download ''Category 1 Update dated June 27, 2012'']]
::*''Category 1 Update dated June 29, 2015'' [https://www.epri.com/research/products/000000003002005684 (EPRI Report # 3002005684)]
:::In mid-2014, an error was identified in the published maximum magnitude (Mmax) distributions for a number of the CEUS seismotectonic model zones. The error was promptly communicated to utility seismic hazard representatives, NRC and DOE representatives, and key technical experts involved in the development of the CEUS SSC model. EPRI published a report (EPRI Product ID: 3002005684) to document reviews performed to determine the extent of condition of the Mmax error and the potential impacts of the error on seismic hazard calculations. The EPRI report documents the originally published and corrected Mmax values and the results of evaluations performed to assess impacts on the recurrence parameters, seismic hazards, and ground motion response spectra (GMRS) estimates at two sites within or near the affected seismotectonic zones. The evaluations were performed in close consultation with the three CEUS SSC sponsors (NRC, DOE, and EPRI) and represent consensus conclusions.
:::Minor Mmax distribution corrections were identified for the PEZ-N, PEZ-W, IBEB, SLR and MidC A through D seismotectonic zones. Sensitivity studies at two sites showed there are negligible impacts on the recurrence parameter results as well as calculated seismic hazard and GMRS results. These impacts are within the level of precision associated with the standard reporting of GMRS, which leads to the conclusion that it is NOT necessary to incorporate the corrected Mmax values into the CEUS model or the published CEUS SSC report.

*'''Category 2''': All other updates approved for posting by the Sponsors (DOE, EPRI and NRC).
::* There are no Category 2 updates available at this time.

Posting of Category 1 and Category 2 updates shall be approved by the Sponsors (DOE, EPRI and NRC).