Quality Activity Quality Activity Inspection of Digital - PowerPoint PPT Presentation

： Quality Activity ： Quality Activity Inspection of Digital Inspection of Digital I&C Vendor I&C Vendor ： GE and DRS Place ： GE and DRS Place (USA) (USA) 41 41

Place: Job Site of Place: Job Site of Lungmen NPS NPS Lungmen ： RPV Internals Activity ： RPV Internals Activity & RIP Installation & RIP Installation 42 42

The unusual events during The unusual events during construction construction • #2 RB Flooding during Typhoon SINLAKU #2 RB Flooding during Typhoon SINLAKU • Rerouting of cables below raised floors floors • Rerouting of cables below raised • • Spent Fuel Pool Leakage Spent Fuel Pool Leakage • • RBSW AV Problems RBSW AV Problems • • #1 RB Flooding during testing #1 RB Flooding during testing • 43 43

#2 RB Flooding during Typhoon #2 RB Flooding during Typhoon SINLAKU SINLAKU On Sep. 13 th th & 14 & 14 th th 2008, Typhoon SINLAKU hit 2008, Typhoon SINLAKU hit On Sep. 13   the northern Taiwan with strong wind and heavy the northern Taiwan with strong wind and heavy rains. It caused the flood in the Unit 2 Reactor rains. It caused the flood in the Unit 2 Reactor Building Radwaste Radwaste Tunnel of the LMNPP, which Tunnel of the LMNPP, which Building is still under construction. is still under construction. Some of the pumps failed to function due to Some of the pumps failed to function due to   th . The offsite power outage in the evening of 13 th . The offsite power outage in the evening of 13 （ outside flood level thus got higher and higher. （ outside flood level thus got higher and higher. ） of RB ） of RB The flood overflew the sand bags and through The flood overflew the sand bags and through   （ 6 inches ） the poorly sealed pipe （ 6 inches ） towards the the poorly sealed pipe towards the RB. RB. 44 44

#2 RB Flooding during Typhoon #2 RB Flooding during Typhoon SINLAKU SINLAKU • The water flew through the hole into the • The water flew through the hole into the （ not RB, and flooded the pumps （ not RB, and flooded the pumps ） submersible pump ） equipped at the submersible pump equipped at the （ EL. ） . These 8 sets of basement （ 8200 ） EL. - -8200 . These 8 sets of basement non- -submersible pump failed to function. submersible pump failed to function. non • The flood level eventually reached about 2 • The flood level eventually reached about 2 （ inside of RB ） meters. （ inside of RB ） meters. 45 45

Unit 2 Reactor Building Unit 2 Control Building “日＂ Type opening Radwaste Tunnel 46 46

Typhoon SINLAKU Flooding Path Typhoon SINLAKU Flooding Path 停電 停電 停電前原設置 停電前原設置 有4 有 4 台抽水泵 台抽水泵 停電後只剩2 停電後只剩 2 台由柴油發 台由柴油發 電機供電之抽水機運轉 電機供電之抽水機運轉 47 47

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RB Room 149 Flooding Sketch Map RB Room 149 Flooding Sketch Map 49 49

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Recovery Plan Recovery Plan • All affected equipment have been repaired according to • All affected equipment have been repaired according to the recovery plan the recovery plan 「 TPC established 「 • TPC established • Special maintenance plan before Special maintenance plan before 」 （ turnover 」 （ including Post Construction Test phase ） including Post Construction Test phase ） turnover 「 Special maintenance plan after turnover 」 TPC set up 「 Special maintenance plan after turnover 」 • TPC set up • （ （ operation test, Startup test, commercial operation phase ） ） including Pre- -operation test, Startup test, commercial operation phase including Pre • Evaluate the PCT, Pre • Evaluate the PCT, Pre- -op, Startup test result op, Startup test result • Enhanced supervision for at least 2 cycles after • Enhanced supervision for at least 2 cycles after commercial operation commercial operation • Ensure the affected equipment can perform its intended • Ensure the affected equipment can perform its intended safety function not only in testing phase but also in safety function not only in testing phase but also in operating phase operating phase 53 53

Rerouting of cables Rerouting of cables • 39th Periodic Inspection conducted by • 39th Periodic Inspection conducted by AEC (June 21 ~ June 25,2010) AEC (June 21 ~ June 25,2010) • Major Inspection Findings: • Major Inspection Findings: Violation of Independence and – Violation of Independence and – Separation criteria Separation criteria Inadequate Cable Routing Condition – Inadequate Cable Routing Condition – 54 54

Div. 1 - - Red Red Div. 1 Div. 2 - - Green Green Div. 2 Div. 3 - - Yellow Yellow Div. 3 Div. 4 - - Blue Blue Div. 4 Div 2 Div 2 Div 4 Div 4 55 55

56 56 Div. 2 Div. 2 Div. 1 Div. 1

Div. 3 - - Yellow Yellow Div. 3 Div. 1 - - Red Red Div. 1 Div. 4 - - Blue Blue Div. 4 Different divisional cables were mixed in the cabinet 57 57

instrument cables are mixed together 58 58 Power or control cables and

59 59 Field Run? Free Run ?

Cables cannot be Oh! My God ! What a mess installed twisted together 60 60

Insufficient bending radius Insufficient bending radius 61 61

Investigations & Corrective Actions Investigations & Corrective Actions • Investigations – Limited space for cable raceway. – Lack of cable spreading room. – Deficiencies in installation of field run cable • No separation of instrument cables from control or power cables will introduce potential EMI problems. • Defects in separation between different divisions of safety related cables and between safety related cables and non-safety related cables 62 62

Investigations & Corrective Actions Investigations & Corrective Actions • Corrective actions: – Rerouting/Rearrangement Plan taken immediately – Re-inspection of cable installation in other areas – Enhance the training and experience feedback for workers. – Modifying the procedure for inspection of cable installation. • AEC requested TPC to conduct a review from various aspects including design, construction and installation, inspection, personnel training, engineering management and organizational culture, etc., and to investigate the cause for the defects, and submit feasible improvement plans and thoroughly implement them. 63 63

CB 12300 RM591, before CB 12300 RM591, after CB 12300 RM591, before CB 12300 RM591, after 1PEX4278 1PEX4278 1PEX4278 6 4 64 64

CB 12300 RM591, before CB 12300 RM591, before CB 12300 RM591, after CB 12300 RM591, after 1PEX4287 1PEX4287 6 5 65 65

CB 12300 RM591, after CB 12300 RM591, after CB 12300 RM591, before CB 12300 RM591, before 1PEX4290 1PEX4290 1PEX4291 1PEX4291 6 6 66 66

CB 12300 RM501, after CB 12300 RM501, after CB 12300 RM501, before CB 12300 RM501, before 1PEX4262 1PEX4262 1PEX4263 1PEX4263 6 7 67 67

CB 12300 RM501, after CB 12300 RM501, after CB 12300 RM501, before CB 12300 RM501, before 1PDX4250 1PEX4250 1PDX4250 1PEX4250 6 8 68 68

CB 7600 RM491, before CB 7600 RM491, before CB 7600 RM491, after CB 7600 RM491, after 1PEX4208 1PEX4208 6 9 69 69

CB 7600 RM491, before CB 7600 RM491, before CB 7600 RM491, after CB 7600 RM491, after 1PD34201 1PD34201 70 70

CB 7600 RM492, before CB 7600 RM492, after CB 7600 RM492, before CB 7600 RM492, after 1PEX4217 1PEX4217 7 1 71 71

CB 7600 RM492, before CB 7600 RM492, before CB 7600 RM492, after CB 7600 RM492, after 1PEX4215 1PEX4215 7 2 72 72

CB 7600 RM492, after CB 7600 RM492, before CB 7600 RM492, after CB 7600 RM492, before 1PE24202 1PE24202 7 3 73 73

Spent Fuel Pool Leakage Spent Fuel Pool Leakage • On 7/19/2011, SFP liner leakage detection • On 7/19/2011, SFP liner leakage detection piping level high alarm appeared, and piping level high alarm appeared, and suspicious water found on lower floor suspicious water found on lower floor • The leakage detection piping monitoring • The leakage detection piping monitoring SFP bottom floor welding was full of water SFP bottom floor welding was full of water and the leakage rate reached 2.5 L/min and the leakage rate reached 2.5 L/min • Leaking water was found on south, north, • Leaking water was found on south, north, and west side walls of SFP and west side walls of SFP • SFP • SFP weldings weldings passed all VT, PT and VBT passed all VT, PT and VBT • SFP passed full • SFP passed full- -water test water test 74 74

Spent Fuel Pool Leakage (cont.) Spent Fuel Pool Leakage (cont.) North 燃料池 EL. 31700 Unistrut on north side wall found South side leaking water floor and wall EL. 18100 found leaking water West side floor found leaking water 75 75

Schematic View of Overflow Channel Schematic View of Overflow Channel Overflow Channel Welding open. Water flow to Leak Chase Line E G R FI-0008L U S K O N A T T e s a h C L 8 k 0 a 0 e Liner welding - L I F O e T n i L 76 76