ML13071A235

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List of AP1000 Critical Tasks Final
ML13071A235
Person / Time
Site: 05523694
Issue date: 03/12/2013
From:
NRC/RGN-II
To:
References
55-23694-SP
Download: ML13071A235 (6)
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Text

1 AP 1000 Critical Task List The bounding condition is described below each critical task.

1. Manually trip the reactor, step in E-0 If not completed until after completion of Safeguards step in E-0 would be a failure of the task
2. Manually isolate steam flow/stop steam flow to the turbine, in E-0, RNO steps Prior to meeting the entry conditions for Subcriticality or Integrity FRP red/orange path
3. Manually actuate safeguards when required, in E-0, RNO steps, ensure at least 2 of 4 divisions are actuated Prior to meeting entry conditions of E-1, E-2, E-3 or any FRP red/orange path or completion of safeguards actuation E-0 step
4. Manually isolate main feedwater, in E excessive cooldown or uncontrolled filling of S/G Prior to reaching Wide Range level of 100%
5. Manually actuate Core Makeup Tanks (CMTs) following a small break LOCA, in E provides RCS make up and boration Prior to exiting E-0
6. Failure to trip reactor coolant pumps after CMT actuation, in E-0, RCP flow will impede CMT flow Prior to exiting E-0
7. Manually actuate PRHR, in E-0, it is the safety related heat sink Prior to transitioning to FR-H-1
8. Manually actuate containment isolation (T signal), at least one valve closed in each containment penetration, in E-0 Prior to exiting the scenario
9. Manually actuate RNS isolation when required, in E valves are closed - RNS valves gets different signal Prior to exiting the scenario
10. Manually actuate main steam isolation, in E-0 Prior to orange path for Subcriticality or Integrity FRP

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12. Manually actuate Passive Containment Cooling System, in E-0 Prior to transitioning from E-0
13. Manually isolate SFW on low Tcold signal - in E ensuring the valves are closed is critical to prevent an overcooling event Prior to reaching Wide Range level of 100%
14. Manually establish required feedwater flow to S/G, in E-0 Critical only if PRHR HX is required but not available - Prior to transitioning to FR-H-1
15. Establish secondary heat sink if PRHR flow <770 gpm, in E-0 Failure to implement FR-H.1 based on conditions is a failure of the critical task
16. Manually actuate Automatic Depressurization System Stages 1-3 if required, in E-1 Prior to exiting E-1
17. Manually actuate ADS Stage 4 when required, in E-1 Prior to exiting E-1
18. Manually actuate IRWST injection, in E-1 Prior to exiting E-1
19. Manually actuate IRWST recirculation following a low IRWST level, in E-1 Prior to exiting E-1
20. Isolate the faulted SG before transition out of E-2, in E-2 Prior to exiting E-2
21. Isolate feed flow to and from the FAULTED steam generator prior to transitioning out of E-2, in E-2 Prior to exiting E-2
22. Isolate feedwater flow to the ruptured SG when greater than required level, in E-3 Prior to exiting E-3

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23. Isolate potential release path from ruptured S/G in E-3, in E-3 If isolated below the level at which the u-tubes are covered and as a result it complicates the mitigation strategy
24. Actuate ADS if required, in E-3 Prior to reaching Wide Range level of 100%
25. Manually align CVS in the auxiliary spray mode or ADS in JOG MODE to depressurize the RCS, in E-3 Prior to exceeding 97% in the ruptured S/G
26. Isolate the LOCA outside containment if ECA 1.1 entered Prior to transitioning out of ECA-1.1
27. Manually actuate CMT injection when criteria is met, in ES 1.1 Prior to exiting ES-1.1
28. Manually actuate Safeguards Actuation when required, in ES 1.1 Prior to exiting ES-1.1
29. Manually actuate ADS when conditions are met, in ES-1.2 Prior to exiting ES-1.2
30. Manually reinitiate CMT injection when criteria is met, in ES 1.2 Prior to exiting ES-1.2
31. Manually align ADS stages 1-3 valves if required, in ES 1.3 Prior to exiting ES-1.3
32. Manually initiate IRWST recirculation, in FR-C.1 Prior to exiting FR-C.1
33. Trip reactor coolant pumps after CMT actuation, in FR-C.1, CMTs are needed for core cooling and RCPs stopped to ensure CMT flow Prior to exiting FR-C.1
34. Manually actuate PRHR when requiring, in FR-C.1 Prior to exiting FR-C.1

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35. Manually actuate containment isolation (T signal), at least one valve closed in each containment penetration, in FR-C.1 Prior to the end of the scenario
36. Manually initiate RCS Makeup, in FR-C.1 Prior to exiting FR-C.1
37. Manually actuate ADS when required, in FR-C.1 Prior to exiting FR-C.1
38. Manually initiate IRWST injection when required, in FR-C.1 Prior to exiting FR-C.1
39. Open RCS vent valves, in FR-C.1 Prior to exiting FR-C.1
40. Manually initiate IRWST recirculation, in FR-C.1 Prior to exiting FR-C.1
41. Manually actuate Passive Containment Cooling System if required, in FR-C.1 Prior to exiting FR-C.1
42. Depressurize the SGs to atmospheric pressure to establish RNS flow, in FR-C.1 Prior to exiting FR-C.1
43. Manually actuate Core Makeup Tanks (CMTs), in FR-C-2 Prior to exiting FR-C.2
44. Manually trip reactor coolant pumps after CMT actuation, in FR-C.2 Prior to exiting FR-C.2
45. Manually actuate containment isolation (T signal), at least one valve closed in each containment penetration, in FR-C.2 Prior to exiting the scenario
46. Manually initiate RCS Makeup, in FR-C.2 Prior to exiting FR-C.2

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47. Manually actuate PRHR when required, in FR-C.2 Prior to exiting FR-C.2
48. Depressurize the RCS using ADS, Stages 1-3, in FR-C.2 Prior to exiting FR-C.2
49. Manually initiate IRWST recirculation, step 9 in FR-C.2 Prior to exiting FR-C.2
50. Depressurize the SGs to atmospheric pressure to establish RNS flow, in FR-C.2 Prior to exiting FR-C.2
51. Manually actuate Passive Containment Cooling System if required, in FR-C.2 Prior to exiting FR-C.2
52. Manually stop RCPs, in FR-H.1 Prior to establishing feed and bleed
53. Manually actuate PRHR before feed and bleed is required, in FR-H.1 Prior to establishing feed and bleed
54. Depressurize using the ADS valves to get less than 1970, in FR-H.1 Prior to establishing feed and bleed
55. Establish startup feedwater flow into at least one SG before RCS bleed and feed is required, in FR-H.1 Prior to establishing feed and bleed
56. Establish main feedwater flow into at least one SG before RCS bleed and feed is required, in FR-H.1 Prior to establishing feed and bleed
57. Establish bleed and feed prior to getting an Orange path on Core Cooling, in FR-H.1 Prior to getting an Orange path on Core Cooling
58. Failure to get at least one containment isolation valve closed in each containment penetration prior to exiting FR-H.1, in FR-H-1 Prior to exiting the scenario

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59. Manually actuate Passive Containment Cooling System, in FR-H.1 Prior to exiting FR-H.1
60. Stop the cooldown, in FR-P.1 Prior to Red Path challenge to the Integrity CSF
61. Stop CMT injection, in FR-P.1 Prior to Red Path challenge to the Integrity CSF
62. Manually trip the reactor or shutdown the reactor, in FR-S.1 Prior to exiting FR-S.1
63. Manually isolate steam flow/stop steam flow to the turbine, in FR-S.1 Prior to reactivity insertion check from uncontrolled system cooldown in FR-S.1
64. Manually actuate the CMT during an ATWS, in FR-S.1 Prior to recheck of reactor trip step in FR-S.1
65. Manually actuate PRHR, in FR-S.1 Prior to exiting FR-S.1
66. Establish secondary heat sink if PRHR flow < 770 gpm, in FR-S.1 If systems to mitigate are available and not used and entry into FR-H.1 is entered this is a failure of the critical task
67. Trip reactor coolant pumps after CMT actuation, in FR-S.1, impedes driving head of CMT Prior to recheck of reactor trip step in FR-S.1
68. Manually initiate Passive Containment Cooling System, inFR-Z.1 Prior to exiting to FR-Z.1
69. Isolate flow to and from the FAULTED steam generator, in FR-Z.1 Prior to exiting FR-Z.1
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