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March 2014

19 . Conduct , reporting and follow up of inspection processes associated with maintenance of SSCs Peter Uhrik. Design, conduct, reporting and follow-up of inspection programmes related to reactor structures, systems and components important to safety. March 2014. The Session Objectives.

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March 2014

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  1. 19.Conduct, reporting and follow up of inspection processes associated with maintenance of SSCsPeter Uhrik Design, conduct, reporting and follow-up of inspection programmes related to reactor structures, systems and components important to safety March 2014

  2. The Session Objectives • to explain what is specific for inspection of SSCs important to safety during maintenance • explanation of the role of site inspector during outage • to present some examples of inspection findings during maintenance

  3. Content • Inspection of SSCs during maintenance • Role of site inspector • Examples of inspections findings during outage in Slovakia

  4. Specific of inspection of SSCs during maintenance • many activities on SSCs during outage: • planed maintenance • unplanned maintenance • modification • testing • plant configuration is specific for outage / shut down mode • time stress, short time for conduction and evaluation of inspection

  5. Role of site inspector • every day report to headquarter • to be fully aware with ongoing outage works • to inspect vendors on the site /work permit, internal contact person…/ • to inspect implementation of the modifications • photo documentation if necessary • member of inspection team (if possible) • to initiate special inspection for area in which site inspector is not specialized

  6. Conduct of inspection (1) • Inspection is performed based on certain inspection manual. • If inspection is not covered by manual special program is prepared. • During inspection of test of SSCs important safety pay attention to conformity of the actual plant configuration with initial status of the SSCs considered in the test procedure. • Proper implementation of modification of SSCs include also modification of relevant documentation/ procedures and adequate staff training. • Focus on verification of fulfillment of acceptance criteria during test of SSC especially during the test after modification.

  7. Conduct of inspection (2) • Make written notes for yourself to be able to write inspection protocol properly. • Ask for site inspector support if necessary.

  8. Start up after outage • Before bringing an installation back into operation following a refueling outage, major maintenance operation or a long term shutdown, the operator should demonstrate to the regulatory body that the installation will be able to continue to operate in compliance with the safety requirements. • The regulatory body may approve or agree to go back into operation and attach conditions as appropriate. • Documents demonstrate readiness of SSCs and whole NPP as well for start up is reviewed by regulatory body.

  9. Examples of inspection findings during maintenance (1) • Identification of findings: outage, site inspector walk down • Problem: feed water pump was repaired, working place was not labeled properly in compliance with internal procedure • Inspector activity: notify, make note (time, place, number of work permit...) • Result: problem was fixed by operator

  10. Examples of inspection findings during maintenance (2) • Identification of findings: outage, event report • Problem: working glove on the sealing part on the opened reactor • UJD activity: inspection of licensee activities before event (all working tools are registered except working gloves) • Result: procedure/system for tools registrations was modified

  11. Examples of inspection findings during maintenance (3) • Identification of findings: outage, event report • Problem: 13 fuel assemblies loaded in the reactor core rotated by 180° (discovered during final core loading check) • UJD activity: inspection aimed at investigation of causes of the event (human factor) • Result: involved personnel retrained from the proper procedures

  12. Examples of inspection findings during maintenance (4) • Identification of findings: outage, start up, planed inspection • Problem: diesel generator failed to start during the test, hardware problem (rotation speed meter) • UJD activity: inspection of maintenance activities during outage • Result: modification of procedure

  13. Examples of inspection findings during maintenance (5) • Identification of findings: outage, start up, planed inspection • Problem: Several modified operational procedures not present at the working place (MCR) during plant start-up. Several were present but the personnel was not acquainted with them in a provable way. • UJD activity: Inspection findings with immediate corrective actions formulated. • Result: Start-up halted until all new procedures were put in place and personnel was acquainted with them.

  14. That Was ….. Conduct, reporting and follow up of inspection processes associated with maintenance of SSCsPeter Uhrik Thank You for your attention: Questions? Design, conduct, reporting and follow-up of inspection programmes related to reactor structures, systems and components important to safety March 2014

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