An internal investigation report addressing concerns over inappropriate methods in the process of seismic hazard assessment for the Onagawa Nuclear Power Station\u2019s compliance with new regulatory standards, including recommendations for recurrence prevention. It discusses selection methods (1\u20134), post-processing, and tuning, highlighting issues in discussions with NRA and management responses.<\/p>\n","protected":false},"comment_status":"open","ping_status":"closed","template":"","meta":{"Ticker":"","DATE":"","longName":"","company_name_ja":"","fullTimeEmployees":0,"address":"","phone":"","website":"","industry":"","sector":"","regularMarketPrice":0,"financialCurrency":"","marketCap":0,"fiftyTwoWeekLow":0,"fiftyTwoWeekHigh":0,"epsTrailingTwelveMonths":0,"epsForward":0,"bookValue":0,"totalRevenue":0,"OperatingIncome":0,"operatingMargins":0,"NetIncome":0,"profitMargins":0,"ebitda":0,"trailingPE":0,"forwardPE":0,"priceToBook":0,"returnOnEquity":0,"recommendationMean":0,"recommendationKey":"","targetMeanPrice":0,"numberOfAnalystOpinions":0,"analyst_earnings_data":"","dividendRate":0,"dividendYield":0,"payoutRatio":0,"totalEsg":0,"environmentScore":0,"socialScore":0,"governanceScore":0,"title":"","providerPublishTime":"","link":"","longBusinessSummary":"","longBusinessSummary_ja":"","quarterly_revenue":0,"quarterly_net_income":0,"quarterly_operating_profit":0,"enterprise_value":0,"company_officer_1_name":"","company_officer_1_title":"","company_officer_2_name":"","company_officer_2_title":"","company_officer_3_name":"","company_officer_3_title":"","company_officer_4_name":"","company_officer_4_title":"","company_officer_5_name":"","company_officer_5_title":"","company_officers_update_time":"","get_dividend_history_year1":0,"get_dividend_history_year2":0,"get_dividend_history_year3":0,"get_dividend_history_year4":0,"get_dividend_history_year5":0,"get_dividend_history_year6":0,"get_dividend_history_year7":0,"get_dividend_history_year8":0,"get_dividend_history_year9":0,"get_dividend_history_year10":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"jir_stock_code":"9502","jir_company_name":"Chubu Electric Power Company, Incorporated","jir_importance":"\u2605\u2605\u2605\u2605\u2606","jir_publication_date":"2026-09-14","jir_source_link":"https:\/\/japanir.jp\/wp-content\/uploads\/2026\/09\/9502-20260914-03.pdf","jir_short_summary":"An internal investigation report addressing concerns over inappropriate methods in the process of seismic hazard assessment for the Onagawa Nuclear Power Station\u2019s compliance with new regulatory standards, including recommendations for recurrence prevention. It discusses selection methods (1\u20134), post-processing, and tuning, highlighting issues in discussions with NRA and management responses.","jir_summary":"### Section Heading\nThis report verifies the factual sequence related to the seismic hazard assessment for the Onagawa Nuclear Power Station, pointing out multiple issues in the selection of representative waves in statistical Green\u2019s function and hybrid synthesis methods, setting connection periods for seismic motion evaluation, and post-processing (e.g., filtering). It notes that external expert comments were not reflected in the meeting materials for the suitability review, and cases where NRA cross-checks were bypassed or undervalued are listed.\n\n### Section 2 Heading\nAs recurrence prevention measures, proposals include reform of corporate governance, improvement of organizational culture, regular external technical audits, fostering a modest corporate climate, ensuring psychological safety, establishing internal rules, and ensuring traceability. Emphasis is placed on overcoming\u72ec\u81ea\u306e\u6b63\u5f53\u5316\u7406\u8ad6 (self-justification theory) and strengthening surveillance, and implementing external checks.","jir_financial_highlights":"Unknown: Unknown (Unknown)","jir_category":"","jir_hashtags":"","jir_key_figures":"Description regarding the existence or absence of records for minimizing residuals at each meeting of the adequacy review and evidence trail creation\nCounts of simulated ground-motion candidate data such as Ss-D\/Ss-N (e.g., 600\u30fb300\u30fb900)\nCases of changes to seismic motion evaluation periods due to changes in fault initiation points or source models","jir_meta_title":"Chubu Electric Power Company: Internal Investigation Report on Seismic Motion Evaluation Method Selection and Recurrence Prevention Measures","jir_meta_description":"Key points of an internal investigation report summarizing the process of seismic motion evaluation method selection at the Onagawa Nuclear Power Station, NRA responses, and proposed recurrence prevention measures.","jir_og_title":"Chubu Electric Power Company: Seismic Motion Evaluation Method and Recurrence Prevention Measures","jir_og_description":"Summary of operational practices for seismic motion evaluation related to the Onagawa Nuclear Power Station\u2019s compliance with new regulatory standards and proposals for recurrence prevention.","jir_og_image_url":"\/assets\/og\/company-general_ir.jpg","jir_chart_data_collection":"[]","ir_related_company":7410,"ir_release_date":"","ir_type":"","ir_is_new":false,"ir_document_url":"","jir_ir_type":"general_ir","footnotes":""},"sector":[],"importance":[],"class_list":["post-113302","ir_release","type-ir_release","status-publish","hentry"],"yoast_head":"\n