ML14184B411

Nrc/Nei/Utility MTG 6/11/14

ML14184B411
Person / Time
Site:	Palo Verde
Issue date:	06/11/2014
From:	Wittas D Nuclear Energy Institute
To:	Division of Engineering
Shared Package
ML14184B374	List: ML14184B411
References
Download: ML14184B411 (14)

Text

NRC / NEI / UTILITY MTG 6/11/14 4" & 6" RD/CH Drain Piping Inspection at the Palo Verde Nuclear Generating Station Utilizing Quest's HYDRA' Intelligent Pigging Technology

- Dan Wittas -

1 NRC / NEI / UTILITY MTG 6/11/14

WHY IN-LINE INSPECTION?

• Consequence of a leak on these drain lines

• Location of the piping

- Between 3 large tanks

- Under other utilities

• Relatively accessible for deployment and retrieval inside the lines 2 NRC / NEI / UTILITY MTG 6/11/14

WHY IN-LINE INSPECTION?

Location of the RD/CH piping 3 NRC / NEI / UTILITY MTG 6/11/14

WHY IN-LINE INSPECTION?

REFUELING WATER TANK 4 NRC / NEI / UTILITY MTG 6/11/14

WHY IN-LINE INSPECTION?

REACTOR HOLDUP MAKEUP TANK WATER TANK 5 NRC / NEI / UTILITY MTG 6/11/14

WHY IN-LINE INSPECTION?

HOLDUPTANK SUMP 6 NRC / NEI / UTILITY MTG 6/11/14

WHY IN-LINE INSPECTION?

7 NRC / NEI / UTILITY MTG 6/11/14

WHY IN-LINE INSPECTION?

RD LINES 4" THREADED CAP AND FLOOR DRAIN 8 NRC / NEI / UTILITY MTG 6/11/14

IN-LINE INSPECTION PLAN

• Build a team - BP Engr / Ops / Proj Mgr /

ISI / RP / Work Planner

• Select vendor and technology

- Site visits to 2 potential vendors

- Consideration of NDE technology, FME, equipment decontamination

- Quest's HYDRA' Intelligent Pigging Ultrasonic Technology was selected 9 NRC / NEI / UTILITY MTG 6/11/14

IN-LINE INSPECTION PLAN

• Full scale mockup for deployment, retrieval and blind flaw detection capability

- The inspection tool could be deployed and retrieved, thru 90s and a tee.

- The Quest Hydra' UT inspection tool detected 26 of 34 flaws. All 8 undetected flaws were below the published detection threshold. 10 flaws below the threshold were detected, including 2 - 1/8 diameter flaws.

10 NRC / NEI / UTILITY MTG 6/11/14

IN-LINE INSPECTION PLAN

• Contingencies / Lessons Learned -

- Design engineering T-min acceptance criteria

- Sump pumps need to be removed for access

- 2 Launchers

- Backup water pump & inspection pig

- Pre-req for hot water flush to dilute boric acid

- Leak test ILI piping and use catch basins 11 NRC / NEI / UTILITY MTG 6/11/14

IN-LINE INSPECTION PLAN FG-46 Valve Pit Pump House Floor Drain FG-47 Ground Penetration Ground Penetration Sump Pit 12 NRC / NEI / UTILITY MTG 6/11/14

IN-LINE INSPECTION PLAN FULL SCALE MOCK-UP W/ 32 FLAWS PRIOR TO BURIAL 13 NRC / NEI / UTILITY MTG 6/11/14

IN-LINE INSPECTION PLAN

• Work and inspection instructions, with

- Initial conditions, such as, remove sump pumps, remove 90° elbow in sump, disconnect tank overflow pipes, cap HUT pump skid and floor drains

- Connection of ILI equip, pump, launcher, pipe and valves

- Operate the ILI, evaluate the results and restore systems 14 NRC / NEI / UTILITY MTG 6/11/14