FOSH Forsmark Safety Enhancement Project Post-Fukushima actions at Forsmark NPP
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1 FOSH Forsmark Safety Enhancement Project Post-Fukushima actions at Forsmark NPP NKS January 12-13, 2016 Ove Nilsson Sekretessklass: Open (S1) FOSH Forsmark Safety Enhancement Project F Ove Nilsson
2 FOSH Three step strategy 1:Implemented 2:Ongoing 3:Planned -> Procedure updates - Simple mobile equipment - Agreements Mobile solutions Small plant modifications Large plant modifications: Spent fuel pool cooling & independent core cooling FOSH Forsmark Safety Enhancement Project F Ove Nilsson
3 Post Fukushima Activities Up to 2017 An organisation that can handle the installed modifications during postulated events - human performance (task- and recourse analyses), procedures, training and drills Accident Management project Agreement with the Swedish Metrological and Hydrological Institute (SMHI) - exclusive weather forecasts and warnings - directly connected to actions in plant procedures. 2015/2016 Purchase more mobile equipment, update procedures and severe accident management guidelines. - Implementation of new security requirements. Industry Safety-Coordinating Group (KSKG) was formed with representatives from the nuclear industry in Sweden (NPPs and the owners). Developed common requirements for e.g. the independent core cooling system, plant security and spent fuel pool cooling Requirements from authority (core cooling) 2017 Transition solution - robustness & independence 2020 Final solution - Independent Core Cooling First responders team fire brigade & guard force Mobile equipment 2012 Mobile equipment, procedures and agreement 2013 FOSH Modification projects, analysis and accident management FOSH Forsmark Safety Enhancement Project - Extreme weather scenarios - ELAP (Extended Loss of AC Power) - LUHS (Loss of Ultimate Heat Sink) - 72h 2011 Stress test Swedish National Action Plan (SNAP) 2012 Investigations - feasibility 10 subprojects 11 Mars 2011 Fukushima FOSH Forsmark Safety Enhancement Project F Ove Nilsson
4 FOSH Forsmark Safety Enhancement Project FOSH Cohesive project FOSH Analysis (2020) FOSH Accident management (2017) Plant Connections for Mobile DG (2015) Independent core-cooling (2020) FOSH = will fulfill post- Fukushima requirements FOSH = both plant modifications and organizational improvements ELAP+LUHS+weather scenarios up to 72 h Safe state after 72h Spent Fuel Pool Cooling (feed-and-boil) (2016) Mobile Equipment (2017) Transition solution Radiation monitoring (2018) Logistic centre (Emergency preparedness) (2018) FOSH Forsmark Safety Enhancement Project F Ove Nilsson
5 FOSH Accident management project Education & Training Procedures & Routines Exercise & Drills Human Performance Radiation Protection The Accident Management project is responsible for the overall implementation and function of all FOSH-projects (Up to 2017, not independent core cooling) FOSH Forsmark Safety Enhancement Project F Ove Nilsson
6 Spent Fuel Pool Cooling The project target Water level above fuel top Level control Technical solution Feed-and-boil-off long grace times - New pipes and mobile pumps - Level measurement - Manual actions FOSH Forsmark Safety Enhancement Project F Ove Nilsson
7 FOSH project Mobile and temporary equipment Mobile generators Function Enough power to run ordinary start up diesel-sequence. Equipment 7 diesel generators (1350 kva, 6,9/10,5 kv) 4 external tanks (16-19 m³) 24h 11 trailers for transport Cables Mobile cooling of existing DG at F12 Function Makes it possible to cool existing emergency diesel generator with mobile pumps (LUHS). Equipment Connections will be installed during outage Fire pumps, mobile pumps, etc. Std. fire connections and hoses Mobile equipment for extreme weather Function Accident prevention or mitigation of the consequences of extreme weather scenarios. (high/low temp, snow, ice storm, high sea level, organic materials in the intake) Equipment Procurement during 2015/ FOSH Forsmark Safety Enhancement Project F Ove Nilsson
8 Mobile equipment storage FOSH Forsmark Safety Enhancement Project F Ove Nilsson
9 Mobile equipment 2012/13 - Gunnarsbo On-site, Gunnarsbo 5x Diesel generators 30 kva 4x Lighting with built-in diesel generator 8x Lighting of with external generator 10x Diesel generators 5 kva 3x Diesel driven heaters 80 kw 12x Electric heaters 9 kw 6x Petrol driven air compressors 6x 30 m air hoses 5x Electric distribution boards 400/220 V 45x 25 m 400 V (32 A) cables 45x 25 m 220 V cables 30x Jerry cans 20 l At the units 50x LED battery powered lights FOSH Forsmark Safety Enhancement Project F Ove Nilsson
10 External rescue company 2013 A rescue company based in Östhammar but operates throughout Sweden persons on-call with 1 hour response time. - Mobile equipment on-site FOSH Forsmark Safety Enhancement Project F Ove Nilsson
11 External rescue company - mobile equipment FOSH Forsmark Safety Enhancement Project F Ove Nilsson
12 External rescue company - mobile equipment FOSH Forsmark Safety Enhancement Project F Ove Nilsson
13 Mobile equipment Diesel generators & connection points FOSH Forsmark Safety Enhancement Project F Ove Nilsson
14 Connections to the plant modifications during outage FOSH Forsmark Safety Enhancement Project F Ove Nilsson
15 Independent Core Cooling Final solution The new independent system will consist of three main parts: - Independent core cooling: A new building with two diesel driven pumps, a feed water line and a new water source - Residual heat removal - After 72h, a strategy to reach cold shutdown/safe state FOSH Forsmark Safety Enhancement Project F Ove Nilsson
16 Independent Core Cooling New building Level control Auto/manual Two pumps from high to low pressure New isolation valves Water source FOSH Forsmark Safety Enhancement Project F Ove Nilsson
17 New buildings FOSH Forsmark Safety Enhancement Project F Ove Nilsson
18 Residual heat removal FOSH Forsmark Safety Enhancement Project F Ove Nilsson
19 How to reach cold shut down condition/safe state? Existing safety systems + mobile equipment FOSH Forsmark Safety Enhancement Project F Ove Nilsson
20 When will the independent core cooling be in place? TG0 TG1 TG2 TG3 TA F1 RA19 PA TA F3 Skalv. RA18 TA F3 RA20 PA TA F2 RA20 PA FOSH Forsmark Safety Enhancement Project F Ove Nilsson
21 Summary FOSH FOSH will fulfill all post-fukushima requirements The injunction from the regulatory body SSM, stating the conditions for the independent core-cooling system, is divided into two parts: - Transition solution, in order to increase the robustness and to take actions that will make the plant more independent of the existing core cooling system (in operation 2017) Accident management project - Final solution with a new independent core cooling system (in operation 2020 at the latest) Independent core cooling project FOSH Forsmark Safety Enhancement Project F Ove Nilsson
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