[en] The analog seismic monitoring system for HANARO has been improved into a new digital Seismic Monitoring Analysis System(SMAS). For this purpose, the digital type hardware for the SMAS was newly developed. And the seismic monitoring and analysis programs that can provide a rapid and precise information for an earthquake were developed. In order to confirm the functional capability of the developed SMAS, the Site Acceptance Test(SAT) was performed. The results of the SAT satisfy the requirements of the fabrication technical specifications. In addition, the structural integrity and seismic characteristics of the newly developed SMAS were evaluated. The evaluated results demonstrate that the SMAS has adequate structural integrity and it can withstand the seismic loads and remain functional. The developed SMAS is successfully operating in the HANARO instrument room for monitoring and analyzing the signal of an earthquake at the HANARO site. The Seismic Evaluation System(SES) that can perform rapid evaluations of the seismic safety of the reactor building has been developed. After an earthquake, using the seismic signal obtained from the field sensors, the developed SES can perform a detail 3-D seismic analysis of the reactor building and some local analyses of the safety related system required for the assessment of the seismic safety of the HANARO building. In addition, the developed seismic evaluation system equipped with the post processing capability to display analysis results graphically or in report form. It is expected that the SES can be utilized for the evaluation of the seismic safety of the HANARO reactor building and the safety related seismic category structures after an earthquake