Hokuriku Electric Power Company Dose Reduction Measures at Shika Nuclear Power Station Unit-1 Takahashi Toshihiko Hokuriku Electric Power Company.

Slides:

Advertisements

Similar presentations

Generic Pressurized Water Reactor (PWR): Safety Systems Overview

Advertisements

ANTIOXI – Advisory Board Meeting Klas Lundgren Page ANTIOXI Description of Work Packages 3 and 4 Klas Lundgren.

11-Apr ISOE International ALARA Symposium JNES, Tokyo, JAPAN, August,2013 Presentation on: Dose Reduction and Management during Overhauling.

Primary Water Chemistry

1 Decontamination techniques Experience and perspectives for Russian NPP units.

Copyright [insert date set by system] by [CH2M HILL Entity] Company Confidential Update on Fukushima Daiichi NPP 1 – Preparations for Core Debris Removal.

Pre-Filming Method of Reducing Metal Release from Alloy 690 for SG in Primary Water of PWR 2009 ISOE Asian ALARA Symposium Aomori September 9, 2009 Sumitomo.

1 August 30-31,2010 Kyushu Electric Power Co.,Inc. ＮｕｃｌｅａｒＰｏｗｅｒＯｐｅｒａｔｉｏｎＤｅｐｔ．ＭａｓａｈｉｒｏＹｏｓｈｉｎａｇａ Approach for dose reduction in Sendai NPS August 30-31,2010.

Measures for containing an increase in pipes’ dose-equivalent rate in the hydrogen-injected environment at the Shimane Nuclear Power Station Unit 1 １ Tomohiro.

ACADs (08-006) Covered Keywords Pressurized Water Reactor (PWR), Boiling Water Reactor (BWR), primary loop, reactivity, reactivity control, reactivity.

Summer Co-op Experience: OPG Aditi Garg. Darlington Nuclear G.S Located in Bowmanville, ON.

Overview of Incident at Fukushima Daiich Nuclear Power Station (1F) (Informal personal observations) April 2011.

Feedwater Heater Heat Transfer Richard Galati Brent Smith Justin Pierce.

The world’s worst nuclear power accident What happened? Chain reaction in the reactor became out of control creating explosions and a fireball which blew.

Nuclear Energy General Concept. In 2001, total US generation of electricity was 3,777 billion kilowatt-hours.

CHAPTER 4 CPB 20004: Plant Utility n Maintenance

Measures for Reduction of Radiation Exposure at Higashidori Nuclear Power Station Nuclear Power Dept. Tohoku Electric Power Co.

1 OCCUPATIONAL EXPOSURE at JAPANESE NUCLEAR POWER PLANTS in 2005 October 12, 2006 Shigeyuki Wada Safety Information Division Japan Nuclear Energy Safety.

FSRUG Presentation – January 2014 Tennessee Valley Authority Browns Ferry Nuclear Plant Unit 3 Reactor Feed Water (FW) Clean Up Piping Break.

ISOE ･ ATC 2006 ALARA Symposium 1 Approach of Hitachi for Dose Rate Reduction October 12, 2006 Hitachi, Ltd.

1 TEPCO’s ALARA Program (Basic Policy of Mid- and Long- Term Exposure Reduction) Toshiyuki HAYASHIDA Tokyo Electric Power Company Radiation Protection.

Cooling Systems Purpose: to keep the engine at it’s most efficient operating temperature TOO HOT! TOO COLD! - poor lubrication - excessive heat - seizing.

0 Zinc Injection from Hot Functional Test in Tomari Unit 3 Nov MITSUBISHI HEAVY INDUSTRIES, LTD. HOKKAIDO ELECTRIC POWER CO., INC.

EPRI Radiation Management Program: Review of Radiation Field Reduction Strategies HPS Power Reactor Session July 12 th, 2009 Dennis Hussey Sr. Project.

EPRI Radiation Management Program: Review of Radiation Field Reduction Strategies ISOE Asian Technical Center ALARA Symposium September 8th, 2009 Dennis.

MODULE “COST ESTIMATION, CALCULATION AND COST CONTROL” SAFE DECOMMISSIONING OF NUCLEAR POWER PLANTS Project BG/04/B/F/PP , Programme “Leonardo da.

PSN CDCC Rev2 Copyright 2009, Toshiba Corporation. 1 Precise control of Fe concentration in feedwater for Co-60 concentration reduction.

MODULE “PROJECT MANAGEMENT AND CONTROL” SAFETY ASSESSMENT DURING DECOMMISSIONING SAFE DECOMMISSIONING OF NUCLEAR POWER PLANTS Project BG/04/B/F/PP ,

Claudio Bortolin. 1 st June: PT100 electrical connection failure (Temp Chiller water In&Out) 1) it required an access to the cavern to be fixed 2) access.

1 Dose reduction actions in Tsuruga-2 NPP Hiroshi WADA, Yuuichi HAMANAKA, Masayuki FUKUDA Tomomi YOSHINAGA, Eiji SANEHIRA,Masahiro YANO, Yasuo UNI, Kazushige.

1 TEPCO’s Challenges for Occupational Exposure Reduction -Installation of Additional CF in Fukushima Daiichi NPP- Shunsuke HORI, Akira SUZUKI Tokyo Electric.

ISOE/ATC ALARA Symposium 2006 The Japan Atomic Power Company 1 Progress of the Zinc Injection in Tsuruga NPP Unit 2 October 12, 2006 THE JAPAN ATOMIC POWER.

Improvement of TEPCO’s ALARA Process Shiro TAKAHIRA Tokyo Electric Power Company Radiation Protection Group ISOE-ATC Symposium October 12, 2006, Yuzawa,

Nuclear Power Plant Orientation

All Rights Reserved. Copyright © 2008, Hitachi-GE Nuclear Energy, Ltd. 1-0 ※ この資料の複写、第 3 者への公開を固く禁じます。 All Rights Reserved. Copyright © 2009, Hitachi-GE.

Dose Rate Reduction Methods at Shimane Nuclear Power Station Tadashi Kanaoka1, Hiroyasu Kajitani1, Tsuneo Sato1, and Naoshi Usui2 1The Chugoku Electric.

adiation safety management practices in 19th preventative maintenance of Kori unit 4 and future plans.

The Improvement of ALARA for the Steam Generator Maintenance Radiation Safety Department The 3 rd Plant, Ulchin Nuclear Power Site.

Presented by: Bob Hite, Radiation Protection Manager Cook Nuclear Plant American Electric Power September 24-25, 2012 Asian ISOE ALARA Symposium Tokyo,

1 ALARA at the Borssele nuclear power plant. 2 ALARA at the Borssele P Borssele  NPP Borssele  In the delta in the Southwest of the Netherlands  KWU.

Quad Cities Unit One Cobalt-60 Experience Presenter:Kenneth Ohr Authors:Kenneth Ohr Radiological Engineering Manager - Quad Cities Ellen Anderson Director.

4´th ISOE European Workshop on Occupational Exposure Management at NPP´s March 2004 – Lyon France “ALARA” versus reactor safety concern - A practical.

Unit 2, Genkai Nuclear Power Plant

Occupational Radiation Protection at Swedish Nuclear Power Plants: Views on Present Status and Future Challenges Ingemar Lund et al. Department of Occupational.

LOW PRESSURE REACTORS. Muhammad Umair Bukhari

Reduction of the collective doses in Almaraz Nuclear Power Plant through source term reduction and the work load reduction.

ISOE Asian Technical Center 2005ALARA Mini-Workshop Fugen Nuclear Power Station, JAEA- 1 Demonstration of Zinc Injection Technique in Fugen Nuclear Power.

1 Activitiesfor Dose Reduction Hamaoka Nuclear Power Station Chubu Electric Power Co.,Inc. November 2005.

Mitigating Adverse Radiological Impacts of Steam Generator Replacement Through Source Term Reduction Startup and Shutdown Operating and Chemistry Strategies.

02:21 Full System Decontamination at the Obrigheim Nuclear Power Plant Prior to Decommissioning Wilhelm Kukla, EnBW Kernkraft GmbH, Obrigheim NPP Christian.

EPRI Radiation Exposure Management Program Highlights

Thermodynamics Cycles.

Radiation Safety Management

Summary of the Earthquake and Situation of the Kashiwazaki-Kariwa NPP

Components Demineralizers.

BNFL Instruments, British Nuclear Fuels plc.

Richard L. Doty PPL Susquehanna, LLC

STATUS OF NJ NUCLEAR PLANTS SINCE LAST MEETING

ISOE Asian Technical Center ALARA Symposium September 8th, 2009

Stop Check Valve Used in Ammonia Refrigeration System Manufactured by Maniks

Pressurized Water Reactor

Electrical Gas Plumbing Heating & Cooling

9.5 Nuclear Power Although nuclear power does not come from a fossil fuel, it is fueled by uranium, which is obtained from mining and is non-renewable.

PRODUCTS (POWER PLANT)

Timeline of Key Events B&W Safety Assessment Indicates Head Inspection Being Performed, Sources of Leaks Identified, No Other Inspections Required D-B.

Session Name: Lessons Learned from Mega Projects

4th ISOE European Workshop on Occupational Exposure Management at NPPs Lyon, France, March 2004 Kirsi Alm-Lytz Radiation and Nuclear Safety Authority.

Summary of the Earthquake and Situation of the Kashiwazaki-Kariwa NPP

The Improvement of ALARA for the Steam Generator Maintenance

Presentation transcript:

Hokuriku Electric Power Company Dose Reduction Measures at Shika Nuclear Power Station Unit-1 Takahashi Toshihiko Hokuriku Electric Power Company

Location of Shika NPP Toky o Hamao ka

Hokuriku Electric Power Company Major Specification of Shika Unit-1&2 Shika Unit-1Shika Unit-2 Commercial operation July 1993March 2006(Plan) Reactor type BWR5ABWR Electric power 540MW1358MW Condensate polishing system hollow fiber filter ＋ demineralizer hollow fiber filter ＋ demineralizer RWCU flow rate 64t/h154t/h (2% of feed-water flow rate)

Hokuriku Electric Power Company Dose reduction measures on design and construction stage Improvement of the procedures of work Automatic or remote system Automatic equipment for In Service Inspection Automatic machine for CRD replacement Automatic decontamination machine for reactor well Improvement of the environment of the work field Reduction of corrosion product Use of materials with low-cobalt content Dual Condensate polishing system Oxygen injection into the feed-water system Reinforcement of shielding Shielding of PLR piping Shielding of high radiation rate piping

Hokuriku Electric Power Company Corrosion Resistant Steel Dual Condensate Polishing System Oxygen Injection Alternative Material for Stellite Low Cobalt Containing Materials Co ≦ 0.05% Reactor Pressure VesselHigh Pressure Turbine Low Pressure Turbine Condenser Generator Hollow Fiber Prefilter Demine- ralizer High Pressure Heater Reactor Waler Cleanup System Corrosion Resistant Steel Iron Crud Reduction Procedures Cobalt Reduction Procedures Low Cobalt Containing Materials Co ≦ 0.05% Fe/Ni Ratio Control with Iron Injection Low Pressure Heater Measures for reducing corrosion product in Shika unit 1

Hokuriku Electric Power Company The Systematic approach to dose reduction of each work （ PDCA cycle ） Mentioning the measures in manuals Radiation control during the work Confirming the effect of measures Planning the dose reduction measures for each work

Hokuriku Electric Power Company temporary shielding minimizing the drainage range Dose rediction measures on operation stage securing the distance between source and working area preventing the thoughtless access to source shortening the work time by mock-up control the work time Shield Time Source removal Chemical decontamination RHR low temperature shutdown cooling operation Distance

Hokuriku Electric Power Company Sv Weld line crack check of PLR piping Partial replacement of PLR piping Collective Dose of Plant Outage at Shika Unit-1 Collective dose(man/Sv) regular work Special work The inspection of PLR pump&valves Plant outage 1 st 2 nd 3 rd 4 th 5 th 6 th 7 th 8 th 9 th Chemical decontamination

Hokuriku Electric Power Company :extent of decontamination RHR F017A PLR F002A PLR F001A PLR(A) ● ● ● ●● ● ＡＢＣＤＥＦ ●● ＧＨ :extent of decontamination RHR F017B PLR(B) PLR F002B CUW F001 RHR F010B RHR F010A PLR F001B ● ● ● ●● ● ＡＢＣＤＥＦ ●● ＧＨ The result of 8th outage Chemical decontamination Chemical decontamination

Hokuriku Electric Power Company Results of Chemical Decontamination (example of EL.6260) EL.6260 PLR(A) PLR(B) PLR(A) PLR(B) PLR(A) PLR(B) PLR(A) PLR(B) Before Decon. After Decon. 4th outage PLR(A) 5th outage PLR(B) Chemical decontamination

Hokuriku Electric Power Company The results of chemical decontamination of PLR piping outage Dose reduction (calculated) work 4th 0.8man/Sv ・ The inspection of PLR pump(B)&valves 5th 0.95man/S v ・ The inspection of PLR pump(B)&valves 8th 3.99man/S v ・ Weld line crack check of PLR piping ･ Partial replacement ofPLR pipes Chemical decontamination

Hokuriku Electric Power Company Co-60 deposition on PLR piping with decontamination Chemical decontamination

Hokuriku Electric Power Company RHR low temperature shut down cooling operation Passed time after reducing reactor pressure （ h ） Reactor Water temp. （℃） Past shutdown cooling Start of reducing pressure op. RHR preparation start Operation start of RHR SHC(150 ℃ ) Past SHC LT-SHC :Period of reactor cooling by condenser ： Period of reactor cooling by RHR RHR preparation Low temperature shutdown cooling RHR LT-SHC ( ≦ 110 ℃ ) start

Hokuriku Electric Power Company Radioactivity deposition on RHR piping during shutdown cooling shutdown cooling start temperature