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Working Material INIS-XA-197 XA9952729 WORKING MATERIAL CO-ORDINATED RESEARCH PROGRAMME ON BENCHMARK STUDY FOR THE SEISMIC ANALYSIS AND TESTING OF WWER-TYPE NUCLEAR POWER PLANTS VOLUME 5A EXPERIENCE DATA Reproduced by the IAEA Vienna, Austria, 1996 /? NOTE The material in this document has been supplied by the authors and has not been edited by the IAEA. The views expressed remain the responsibility of the named authors and do not necessarily reflect those of the govemment(s) of the designating Member State(s). In particular, neither the IAEA nor any other organization or body sponsoring this meeting can be held responsible for any material reproduced in this document 30-45 DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. Title: Experience database of Romanian facilities subjected to the last three Vrancea earthquakes Contributor: O. Coman and J.D. Stevenson Date: November 1995 PREFACE The Co-ordinated Research Programme on the Benchmark Study for Seismic Analysis and Testing of WWER-Type NPPs was initiated subsequent to the request from representatives of Member States at the Technical Committee Meeting on Seismic Safety Issues Relating to Existing NPPs held in Tokyo, August 1991. The conclusions of this meeting called for the harmonization of methods and criteria used in Member States in issues related to seismic safety. With this objective in mind a Consultants' Meeting was convened in April 1992 to produce a working document for a CRP. The meeting was attended by twenty specialists coming from Eastern Europe, Western Europe, USA as well as Japan. On the basis of the recommendations of this group it was decided that a benchmark study is the most effective way of achieving the principal objective. Two types of WWER reactors (WWER-1000 and WWER-440/213) were selected as prototypes for the benchmark exercise. The two prototypes are Kozloduy Units 5/6 for the WWER-1000 and Paks for the WWER-440/213 NPPs. Twenty-two internationally recognized institutions (public or private companies) from fourteen countries take part in the state-of-the-art seismic analysis and testing of the two prototypes. Three other institutions are attending the meetings as observers and contributing results of their research on a voluntary basis. The first and second RCMs were held at the Paks NPP in September 1993 and the Kozloduy NPP in June 1994 during which plant walkdowns were also performed to familiarize the programme participants with the WWER-440/213 and WWER-1000 type plants, respectively. One of the major activities which took place after the Kozloduy RCM was the full scale dynamic testing of Paks NPP using several blasts. Results of the analyses from the research projects of all the participants as well as the testing which took place at Paks NPP were discussed during the third RCM in St. Petersburg hosted by CKTI. During this RCM a technical tour of the Vyborg Explosive Test Facility was performed. The first set of Working Material comprised seven volumes and covered the work reported until 1995. The volumes were arranged by topic, i.e. Volume 1 - Data related to sites and plants; Volume 2 - Generic material: codes, standards, criteria; Volume 3 - Kozloduy Units 5/6: analysis/testing; Volume 4 - Paks NPP: analysis/testing. The present (second) set keeps the same arrangement between topics and volumes with new letters denoting additional material belonging to the same volume. Volume 5, which is new, will cover material related to Experience Data. This set comprises contributions from participants until January 1996. No change was made to the original texts in the preparation of this set of Working Material Aybars Giirpinar, Project Officer IAEA, Division of Nuclear Installation Safety February 1996 LIST OF PARTICIPATING INSTITUTIONS (Responsible persons) Belgium - Westmghouse Energy Systems Europe S.A. (Monette) Bulgaria -Building Research Institute (Sachansky) - Central Laboratory for Seismic Mechanics and Earthquake Engineering (Kostov) - Energoproekt (Simeonov) - EQE-Bulgaria (Jordanov) - Kozloduy NPP (Boyadjiev) Czech Republic - David Consulting (David) - Stevenson & Associates. Plzen (Masopust) Finland - IVO International Ltd. (Varpasuo) Germany - Siemens (Krutzik) - Wolfel (Henkel) Hungary -PaksNPP (Katona) Italy - Ismes S.p.A. (Muzzi) Macedonia - Institute of Earthquake Engineering and Engineering Seismology (Jurukovski) Romania - Stevenson & Associates Seismic Engineering (Coman) Russia - Atomenergoprojekt (Ambriashvili) - CKTI Vibroseism (Kostarev) - The All-Russia Nuclear Power Engineering Research and Development Institute (VNIIAM) (Kaznovski) Slovakia - Institute of Costruction and Architecture, Slovak Academy of Sciences (Juhasova) Spain - Empresarios Agrupados (Ordonez) Switzerland - Stussi & Partner (Stussi) USA - EQE International (Asfura) Experience Database EXPERIENCE DATABASE OF ROMANIAN FACILITIES SUBJECTED TO THE LAST THREE VRANCEA EARTHQUAKES Final Report Research Report prepared for the international Atomic Energy Agency Vienna, Austria Contract No. 8223/EN Chief Scientific Investigator: \ Ovidiu Coman Research team: Dan Lungu - University of Civil Engineer Bucharest. Traian Moldoveanu - GEOTEC - Bucharest. Senior Consultant: J.D. Stevenson - S&A, USA Stevenson & Associates Bucharest Office Faurei#1, P11, Apt. 80 Bucharest -784091 P.O. Box 68-61 ROMANIA Period Covered November 1994 - October 1995 Experience Database Contents: Part I. Probabilistic hazard analysis for the Vrancea earthquakes in Romania 1. Introduction 2. The Vrancea source 3. Probabilistic seismic hazard evaluation 3.1 Magnitude recurrence relationship 3.2 Ground motion attenuation 4. Site dependent response spectra for design 4.1 Site dependent frequency content of the accelerograms 4.2 Accurate seismic response 4.3 Bucharest narrow frequency band motions of long predominant period and design spectra for soft soil condition 4.4 Moldavia and Republic of Moldavia response spectra 4.5 Response spectra for the ground motions recorded in Dobrogea 5. Characteristics of the free field accelerograms from the last three Vrancea earthquakes recorded by the seismic networks of INFP and GEOTEC. Experience Database Part II. Experience Database. 6. Philosophy of an experience-based generic approach 6.1 Qualification by earthquake experience 6.2 Qualification by testing 6.3 Qualification by Analysis 6.4 Hybrid qualification by combined analysis and testing 7. Approach and scope 8. Database structure and description 8.1 Data availability 8.2 Data requirements 9. Collection procedure 10. Experience data 11. Conclusion 12. References 13. Acknowledgment Appendix 1. - equipment test data Appendix 2. - description of the test facility capability Experience Database Pag. 4 1. Introduction Earthquake experience data was recognized in US as a potential basis for a simplified procedure for verifying the seismic adequacy of equipment by Seismic Qualification Utility Group SQUG in the early 1980's. During these early years, SQUG collected data from past earthquakes and reviewed it in detail. This review was used to establish inclusion rules for definition of the generic equipment classes and screening criteria. Collection of earthquake experience data is still an important task because of the use of experience for new and replacement equipment and parts. The nuclear industry has developed methods and procedures for using experience data to obtain equipment seismic qualification in a cost effective manner. The use of earthquake experience data for evaluation and design of equipment is expanding beyond the nuclear power industry. The lessons learned from this experience could be applied to develop an approach which would include equipment screening, equipment specific attributes to demonstrate seismic adequacy, implementation guidelines and Peer Review. In US one result of this effort is a Generic Equipment Ruggedness (GERS) for each equipment class. The GERS is defined as the response to input motion at the base or support point for vtfiich equipment of a given class has been demonstrated, on the basis of test experience, to have sufficient ruggedness to perform as required. This study was initiated by the IAEA Benchmark Study for Seismic Analysis and Testing of WWER Type Nuclear Power Plants. The scope of this research project is to initiate a database setup in order to use the past seismic experience of similar components from power and industrial facilities to establish the generic seismic resistance of nuclear power plant safe shutdown equipment applicable to the Eastern European countries. The project has the following objectives : a) first part: -to collect and process all available seismic information about Vrancea earthquakes; -to perform probabilistic hazard analysis of the Vrancea earthquakes; -to determine attenuation low, correlation between the focal depth, earthquake power, soil condition and frequency characteristics of the seismic ground motion; Experience Database Pag. 5 The first part of the project provide information about Vrancea earthquakes which affect the Romanian territory and also the Koslodui NPP site as a background of the investigation of the seismic performance of mechanical and electrical equipment in the industrial facilities. b) second part -to investigate and collect information regarding seismic behavior during the 1977, 1986 and 1990 earthquakes of mechanical and electrical components from industrial and test facilities The second part describe the experience
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