ML093500565

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NRC Handouts Current Status of Arkansas Nuclear One Unit Steam Generators, December 2009
ML093500565
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 12/15/2009
From:
AREVA NP, Entergy Corp
To:
Division of Operating Reactor Licensing
Kalyanam N, NRR/DORL/LPL4, 415-1480
Shared Package
ML093500491 List:
References
Download: ML093500565 (67)
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ANO1 Steam Generators NRC Presentation Current Status of the Arkansas Nuclear One Unit One Steam Generators Entergy/AREVA NP December 2009 1

ANO1 Steam Generators Introductions -

Entergy Jaime McCoy - EP&C Manager Frank Philpott - EP&C Supervisor Dan Meatheany - SG Program Owner Areva Jeff Brown - EOTSG Component Design Eng.

Jim Begley - Technical Consultant Dennis Lang - Product Line Manager 2

ANO1 Steam Generators AGENDA Opening Remarks - Jaime McCoy Description of EOTSG - Dan Meatheany Outage Results - Dan Meatheany Proprietary Section Root Cause - Jim Begley Outage Plans for 1R22 - Dan Meatheany Questions Closing Comments - Jaime McCoy 3

ANO1 Steam Generators Opening Comments Jaime McCoy Engineering Programs and Components Manager 4

ANO1 Steam Generators Description of EOTSG - Dan Meatheany Generators Replaced in Fall of 2005 (1R19)

First ISI was Spring 2007 (1R20)

Second ISI was Fall 2008 (1R21)

EOTSG was Manufactured by AREVA NP Design Enhanced from Originals (EOTSG)

First of a Kind Design in Several Areas - This was to Address Original OTSG Degradation Issues 5

ANO1 Steam Generators

  • 15 Tube Support Plates
  • External FW and EFW Rings
  • Floating TSP/Tie Rod
  • TSP are Trefoil Broach SS
  • Aspirating Port in 10th Span
  • Upper and Lower Shroud
  • Orifice Plate in Downcomer
  • FW into Downcomer
  • EFW Penetrates Shroud
  • 52 Tie Rods Concentric Circles 6

ANO1 Steam Generators Design Changes 690TT Tubing with No Tube Ends No Open Lane Full Depth Hydraulic Expansion in Upper and Lower TSP are Stainless Steel not Carbon Steel Use of a Filler Plate on the 1st, 14th and 15th - Original was 1st and 15th Only and was a Wedge Design Attached to TSP Use of TSP Wedges (AREVA NP Design)

First Span Tie Rods Reduced in Diameter and Longest Span - 46 inches Tie Rods Are Different in Design/Material Use of a Main Steam Venturi 7

ANO1 Steam Generators 1R20 and 1R21 Outage Results

  • Scope
  • Bowed Tie Rods
  • Wear 8

ANO1 Steam Generators 9

ANO1 Steam Generators 1R21 Scope

  • 100% bobbin
  • 100% X-probe of all Wear Indications
  • Secondary Side Visual
  • Annulus and First Tube Support Plate
  • First Span Inner Bundle of Rods
  • 14th and 15th Tube Support Plate 10

ANO1 Steam Generators Bowed Tie Rods 11

ANO1 Steam Generators 1R20 1R21

  1. of Bowed Tie 9 10 Rods Spans with 1 1 Contact Spans with 1st, 14th and 15th 1st, 2nd, 13th,14th Bowed Tie Rods and 15th Maximum Extent 0.89 1.19 of Bowing Thermal Cycles 3 1 EFW Actuation 1 0 12

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ANO1 Steam Generators TSP Wear 26

ANO1 Steam Generators 1R20 - SGA 1R21 - SGA 27

ANO1 Steam Generators 1R20 - SGB 1R21 - SGB 28

ANO1 Steam Generators SGA - 1R21 29

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ANO1 Steam Generators TSP Wear Growth Rate 31

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ANO1 Steam Generators Growth Rate Data from 1R21 SGA SGB 33

ANO1 Steam Generators Proprietary Section ANO Unit 1 Tie Rod Bowing Review Jim Begley 34

ANO1 Steam Generators Proprietary Section 35

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ANO1 Steam Generators Proprietary Section 48

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ANO1 Steam Generators Proprietary Section 58

ANO1 Steam Generators ANO Unit 1 1R22 Inspection Plan Dan Meatheany 59

ANO1 Steam Generators 1R22 Inspection Plans Purpose of Inspections Scope of Inspection Contingency Inspection/Repair Plans Acceptance Criteria Definition of Success 60

ANO1 Steam Generators Purpose of Inspections Confirm Apparent Cause and Analysis Inputs Determine magnitude of tie rod bow Determine if free-span wear exists on tubes around tie rods Determine if denting exists on tubes around tie rods 61

ANO1 Steam Generators Current Scope of 1R22 Inspection Plans Bobbin Test of Surrounding Tubes for All 52 Tie Rods in Both Steam Generators 62

Acceptance Criteria for Tie Rod Lateral Bowing Category 1R21 Inspection Value Acceptance Criteria Potential Additional Analysis, Repairs or Inspections Maximum Lateral Extent of 1.19 inch <1.5 inch > 2.0 inch Tie Rod Bowing in First Span, Outermost Ring Maximum Lateral Extent of 0.47 inch < 0.63 inch >0.78 inch Tie Rod Bowing in First Span, Second Outermost Ring Maximum Lateral Extent of 0.19 inch < 0.25 inch >0.32 inch Tie Rod Bowing in 14th and 15th Spans, Outermost Ring Maximum Lateral Extent of No bowing detected < 0.06 inch > 0.06 inch Tie Rod Bowing in 14th and 15th Spans, Second Outermost Ring Bowed Rods in Contact with 0 0 >2 Tubes outside of First Span 63

Acceptance Criteria for Wear/Dents caused by Tie Rod Lateral Bowing Category 1R21 Inspection Value Acceptance Criteria Potential Additional Analysis, Repairs or Inspections Wear on Tube from Tie 0 0 > 5% TW Rod Tube to Tube Wear as a 0 0 > 5% TW Results of Tie Rod Bowing Dents in Tubes Around 0 0 >1 Bowed Tie Rods > 1 volt 64

ANO1 Steam Generator Definition of Success (1R22)

Tie rod bowing magnitude is as predicted No free-span wear found in tubes around tie rods No denting found in tubes adjacent to tie rods Results of inspection will be used to confirm the applicability of the ASME code qualified stress calculation for A steam generator Future Plans (1R23)

Based on Wear will perform 100% Bobbin Re-evaluate Extent of Bowing Plan to Skip 1R24 and Possibly 1R25 65

ANO1 Steam Generators Questions ?

66

ANO1 Steam Generators Closing Comments - Jaime McCoy 67

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