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r esilient procedure use

r esilient procedure use. H alden Reactor Project, Norway. obey the principles without being bound by them. b ruce lee. r esilience is about…. the ability of a system to adapt to unforeseen, challenging situations (incl. but not limited to Fukushima-scale events)

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r esilient procedure use

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  1. resilient procedure use Halden Reactor Project, Norway

  2. obey the principleswithout being bound by them bruce lee

  3. resilience is about… • the ability of a system to adapt to unforeseen, challenging situations (incl. but not limited to Fukushima-scale events) • the ability to mobilize additional resourceswhen a system approaches its margin of maneuver • enabling smooth transfer of control

  4. motivation • Balancing pre-planned responses and the ability to adapt to novel situations is not easy. These demands can be competing or contradictory. • Focusing solely on procedural adherence may undermine the crew’s ability to make autonomous assessments, to think ahead, and to keep a high-level overview of the situation(over-reliance on procedures). • Emergency response in complex scenarios requires reliability andresilience

  5. motivation To respond to unanticipated situations that are not entirely covered by procedure, crews need • Cognitive capacity, expertise, questioning attitude • Understand procedure backgrounds and applicability • Monitor for anomalies, predict plant evolution • Avoid over-reliance on procedures Can we improve the ability to handle unexpected scenarios through staffing and support systems? • Shift technical advisor • Procedure overview tool • New large screen display with safety focus

  6. resilient procedure use requiresbalancing of heads-downoperation heads-upoperation and How to support this? - Crew roles - Procedure support tools - Overview tools (e.g. LSD) - External support - Others?

  7. experimental design • 5 Swedish and 5 US crews • (note: in Sweden there is no STA position) • 4 EOP scenarios with complications • For optimal recovery, crew may have to make knowledge based decisions. • 2 experimental factors (4 conditions) • STA available / not available (4/3 person crew) • Tools available / not available (Tools = procedure flowchart & large-screen display)

  8. experimental design Experimental design First study to compare LSD with a no-LSD control group counterbalancedto avoid order effects counterbalancedto avoid order effects mostsupport leastsupport

  9. scenarios • Multiple SG tube break • Interfacing system LOCA • LOCA outside containment (RHR system) • Loss of feedwater • Fire in cable compartment • With high-head SI pump breakdown • H.B. Robinson fire event Scenario has been coded into SACADA

  10. week plan

  11. measures • HRA-type performance measures • HFE success / failure, HFE performance time • PSFs, crew errors, aggregated crew stories • New measure of SA for ISV • New measure of teamwork competence and emergency competence • Eye tracking • Questionnaires

  12. tools for improving situation overview:new large-screen display and STA flowchart

  13. new large screen display

  14. new large screen display: primary status ofimportantsafetysystems status of automatic systems, and other important alarms (e.g. RMS) PRZpressure/leveltrends;alarmlevels;trip points massbalance increasing/ decreasing SG pressure / level trends sub-cooling

  15. procedure flowchart E-0 E-1 E-2 E-3 ECA-1.1 ECA-1.2 ECA-1.3 ES-1.2 FR-H.1 FR-P.1

  16. Link to high-level summary > < Grouping of procedure steps Critical action steps > < Procedure /step transfers Key decision point > Link to background material > < Procedure transfers (clickable) Step number > < Short description of step links to full text

  17. CSF status, link to decision tree > Foldout page, link to appendix >

  18. Some flowcharts contain diagrams with live data > *

  19. Halden Reactor Project, Norway

  20. contact Michael.Hildebrandt@hrp.no

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