ML031690190

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6/17/03, Meeting Handouts - to Discuss Licensee'S May 8, 2003 Request for Relaxation from Nrc'S Vessel Head Inspection Order
ML031690190
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 06/17/2003
From: Alexion T
NRC/NRR/DLPM/LPD4
To:
Office of Nuclear Reactor Regulation
References
TAC MB8927
Download: ML031690190 (50)
v • d • e


Text

NRC FORM 658 U.S. NUCLEAR REGULATORY COMMISSION TRANSMI1TAL OF MEETING HANDOUT MATERIALS FOR IMMEDIATE PLACEMENT IN THE PUBLIC DOMAIN This form is to be filled out (typed or hand-printed) by the person who announced the meeting (i.e., the person who issued the meeting notice). The completed forrn, and the affached copy of meeting handout materials, will be sent to the Document Control Desk on the same day of the meeting; under no circumstances will this be done later than the working day after the meeting.

Do not Include proprietarymaterials.

DATE OF MEEiNG The attached document(s), which was/were handed out in this meeting, is/are to be placed 06/17/2003 in the public domain as soon as possible. The minutes of the meeting will be issued in the near future. Following are administrative details regarding this meeting:

Docket Number(s) 50-368 Plant/Facility Name Arkansas Nuclear One, Unit 2 (ANO-2)

TAC Number(s) (if available) MB8927 Reference Meeting Notice 06J04/03 (ML031560682)

Purpose of Meeting (copy from meeting notice) To discuss the licensee's May 8, 2003, request for relaxation from NRC's vessel head inspection Order.

NAME OF PERSON WHO ISSUED MEETING NOTICE TITLE Tom Alexion Project Manager OFFICE Nuclear Reactor Regulation DIVISIONl Division of Licensing Project Management BRANCH Project Directorate IV Distribution of this form and attachments:

Docket File/Central File PUBLIC

,__ Q 1~~~c NRC FORM 658 (91999) PRINTED ON RECYCLED PAPER TNs bnnmwas designed uing InFomns

Entergy Operations, Inc.

Date - June 17, 2003

t BUJa mnes 6117/2003 2

Purpose of Meeing ioBMV Hardship s,RVH Inspection Plans t*Diverse and Complementary Inspections

  • Relaxation Requests toAnswer Questions 6/17/2003 3

A,enda Introduction Bill James Hardship Review Doug Edgell Inspection Plans William Sims Other Relaxation Requests William Sims Closing Remarks Craig Anderson 6117/2003 4

Feb 11, 2003 Order Requirements for BMV IV.C (1) plants in the High category, RPV head inspections shall perform:

1) (a) Bare metal visual examination of 100% of the RPV head surface (including 3600 around each RPV head penetration nozzle), AND (b) Either:

(i) Ultrasonic testing of each RPV head penetration nozzle and an assessment to determine if leakage has occurred into the interference fit zone, OR (ii) Eddy current testing or dye penetrant testing of the wetted surface of each -Groove weld and RPV head penetration nozzle base material.

6/17/2003 5

Fetib ii,Lt 20l 03 Ordrer oA request for relaxation shall address:

  • (1) The proposed alternative(s) for inspection of specific nozzles will provide an acceptable level of quality and safety, or
  • (2) Compliance with this Order for specific nozzles would result in hardship or unusual difficulty without a compensating increase in the level of quality and safety.

6/1712003 6

Entergy Reaxaton for ANQ-2 APPROACH: Two-fold

1. Hardship in Performing BMV
2. Complementary inspections that ensure quality and safety 611712003 7

ANOM-2 ReDixat¢on ReqSUet tMay 8th Submittal: Believed to provide for both BMV hardship as well as a diverse and complementary approach to BMV bo Retrospect: Additional technology can provide supplemental level of diversity 6117/2003 8

IP Reactor V,esseU HedDsg ANO-2 Head Durn lant Construction p II Nozzles (8)

o. CEDM Nozzles (81) *f A *S 4 tI oo RVH Flange opmInsulation Retainer Ring op Accessible Area for - .. ~

BMV Tuno LiftingTrno P, Head Stand W1 WM=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~:

Reactor Vessel Head Fabrcation ANO-2 Head During Plant Coinstruction

o. CEDM Motor Housings F Motor housing and insulation collars were installed from the center out due to the restricted access
  • CEDM Nozzles oICI Nozzles Note: Nozzle toD EDM' connection follow head contour 6/17/2003

Reactor Vessel Head Fibriocation

  • Lift Rig Columns io CEDM Motor Housings .
  • ICI Nozzles V I o CEDM Insulat on Collars 6/17/2003

RVH CoolUng Shroud and Insulation

~~~ L o Cooling Shroud o, ICI Access Doors

  • CEDM Coil Stacks Po Panel Insulation
  • Removable f

Insulation 6/1712003 13

RVH Cooling Shroud and ICI BMV Shroud ICI Nozzles i

I I

Cooling Plenum Lifting I Is Trunion' Cooling Shroud3 Access Doors (typ) 6117/2003 i14

Panes nsua"tbon

  • Collars are enclosed by prefabricated Stainless Steel reflective insulation panels o Panels are sized to closely fit around the collars
  • 56" diameter dome panel and 16 panels .*

around the radius V 6/17/2003 15

Noze nsubaion Colb rs 81 CEDM and 8 ICI collars o Collars are custom fit to vessel contour Tempmat - Fully Encapsulated wJ o Collars are Pittsburgh Fiberglass Cloth Corning TempMat (See Note 3) X insulation covered with fiberglass cloth lagging A and held in place by

'IF' ST. STL WIre (2) stainless steel (SS) I Places wire. 24 GA ST. STL - j%

See Note o Each collar contains a Continous Cylinder 24 GA SS Continuous i Cylinder 6/17/2003 16

Interferences to BMV o CEDM collars cannot be removed with panels installed 1025",

  • Cooling Shroud to Coil Stack Interference
  • Openings in Cooling Shroud are part of the cooling system design
  • Nozzle spacing limits access

> Limited access between cooling shroud and insulation 6/17/2003 17

What's Uniqu About AN2

  • CEDM Motor Housings OA2 I follows the RVH contour
o. Stepped shroud design severely limits access for BMV

, All Coil Stack/RSPTs must be removed to support a BMV 6/17/2003 18 if' .. -

Disassembfly Sequence

  • Remove & Store 162 RSPTs

,o Remove & Store 81 CEDM Coil Stacks  ; I

  • Disconnect, Rig and Store Superstructure C00l]

po.Remove 17 Insulation Xr Panels

> Remove 81 CEDM Insulation Collars T7 _

II 6/17/2003 6117/2003 19 19

Assembly Sequence

  • Install 81 re-designed Insulation Collars
  • Re-install insulation Panels o Re-install superstructure

> Re-install and test 81 CEDM coils stacks o Re-install and test 162 RSPTs W .

6/17/2003

Risk Summya

  • Damage to RSPTs o Damage to CEDM Coil Stacks o Damage to the CEDM Motor Housings During Removal of Lift Rig (Blind Lift /

Tight Clearances) o No qualified CEDM motor or pressure housing repair available 6/17/2003 21

Hlirdshinp SutlmmFF y PThe CEDM Cooling/Insulation System was not designed to allow access to RV head nozzles tANO-2 Cooling System Design is unique

>Significant Dose (23 Rem) impact PRisk of damage to equipment 22 6/17/2003

Inspection Huans WHlllloam Sums 611712003 23

Last Outage 2R15 Voumetr c Inspection Resuls

> 90 reactor vessel head penetrations examined by Ultrasonic techniques

> 81 CEDM, 8 ICI Nozzles

  • UT through wall of the nozzle, J-weld fusion area including the triple point, and Riverbed.

o 1 Vent a UT 45 degree shear waves looking in axial and circ directions o Special interest examinations

  • CEDM 30 Eddy Current of portion of nozzle OD. No indications identified.

6/17/2003 24

2R15 - Su pplemental Visua Xnspect on Above InsuUat5on Performed visual exam -.

above shroud, around A II all ICI nozzles, and some outboard CEDM 1-nozzIes D No boron found -

6/17/2003 25

2R15 Inspectoon Resuls o NO LEAK PATH THROUGH TRIPLE POINT o NO LEAKAGE PATH INDICATIONS FOUND IN ANNULUS o NO PWSCC INDICATIONS FOUND IN NOZZLE OR WELD o NO BORON FOUND ON HEAD PERIPHERY, INSULATION, OR SHROUD ANO-2 Head Integrity Verified 6/17/2003 28

2R16 Inspection Pan

  • CEDM/ICI nozzles No BorotI
  • UT Through wall
  • Triple point
  • Riverbed
  • Supplemental Visual
  • BMVII No
  • Low Frequency Eddy Curent Lea Vessel Exam (CEDM)
  • Vent Line
  • Wetted Surface Inspection
  • Supplemental Visual
  • Low Frequency Eddy Current Vessel Exam 6/17/2003 27

Demonstrton Of Trpe Pont Entergy Demonstration

  • Demonstrated detection of flat-bottomed holes up to 0.200" in depth, on Entergy/MRP Mock-up in 2002.
  • Detected Circ Flaws extending to approximately 0.050" deep in Entergy/MRP Mock-up in 2002.

Phase 2 MRP Demonstration

  • Detected a pure axial/radial squeezed notch that extended thru-weld to the Triple Point (0.060').D 6/17/2003 28

Riverbed Emm i

o Proceduralized process

  • Performed with 2.25 Transducer oHighly sensitive to  !

amplitude changes in tube backwall signal

  • Effective for detection of leakage in annulus 6/17/003e

Riverbed Ident callion file O.vdbtGNUCkus,!-cm Il-Sa '"l DopIq Settle p

- 0fl W,: i.

PO , SI 2 N*0 P Vida F.$ F.

G.., .2.14 dB DC: WI OFCIMt,0.0 d Mi,1, 0 0* CPe, PW 19,0W P"OIi

0. 11t

.I. F-A Leak path identified with 1.1

.ninitigi2'u. '1.1 000straight beam ioili 2o. - no 0 ultrasonics

  • , W: 1.28 V lot I.o 101
  • W_lb MM P I _E LV_

.e Ito loss of shrink fit

~ lintegrity and a 120

____________________ ' resulting n1 increase IN in reflectivity Irol'itt IC) 2*

~..-**.-:

i0.Av 00Wt.Wvi, GL

- . ~ ' -1 . I I-., . . I - .

6/17/2003 30

Vent Line Weted Surfce Em o Complete wetted surfaces examination

  • ECT examination at tube ID surface ECe array examination of J-weld surface 6/17/2003 31

Riaor Vessel Vent ne 3-Groove WeDd EC Exmnetion o Manual delivery, low dose o.12-coil array a 100, 250 and 600 kHz oCoils offset to provide coverage in one rotation 6117/2003 32

CEDM/ICI Vourmetrc Surmmary t Axial and Circ TOFD

  • O degree UT oo.Triple Point

~ 0 degree "Riverbed" examination for leakage assessment UTThrouTh 611712003 33

Supp ement a VsuaI

  • Above shroud oo Around flange I . 1.

i; A eW t.

ol Through doorways rOIk ,,i ik " 1 6/17/2003 34

2R16 Inspecion Pan

  • CEDM/ICI nozzles No BororI
  • UT Through wall
  • Triple point
  • Riverbed
  • Supplemental Visual
  • BMVICI a No
  • Low Frequency Eddy Curent Lea Vessel Exam (CEDMs)
  • Vent Line
  • Wetted Surfaces Inspection
  • Supplemental Visual
  • Low Frequency Eddy Current Vessel Exam 6/17/2003 35

Low Frequency Eddy end Vent Locatbns 611712003 36

Deve,lopment of Low Frequenc EC Vesse Lea ta ge/I ntegrity Inspection o Developed in Spring of 2002, as diagnostic tool

  • Designed to detect leakage/degradation of *4ik carbon steel in head 4 penetration annulus region
  • Utilizes 3/4" Driver/Pick-up probe, operating at 200 Hz 6/17/2003 37

DeveDopment of Low Frequen Vesse eakage/Integrlt Inspection too Evaluated using machined samples, representing various degradation morphologies (rings, grooves, drilled holes)

> Tests performed both on a test stand, and on s o an actual reactor vessel head at the Waltz Mill facility 6/17/2003

Development of Low Frequenc Vesse Leakae/eIntegrjty Inspection

  • t*g*2 ***3
  • 4..g. 5 .

o Inspections were file t t . OSUT"t Tw lf:t2 - t performed on six t-see I w: tl. I:

>_:ri P~ft TP! Div PA*t I.7.

t.t.1wl Mtae 1-FtI: J.1U.

1 r t 1eW?t

,m Il.,: t;~

t' tow_at.s 1 t-ptgt I~V4 s,".

ui,tnuu Axial th ofR gL Comtef-beiGeom sJ s

(

penetrations on the hI.1 ,,l'>r:l,',-ilt1$4 Ptl I VI.t 1n1: 4,1b.

  • Jamesport reactor PACte^ 1  :^ ,t s head
  • Results showed this I tool's ability to map the counter bore region near the OD of I, . _ _

the head (0,015"- 4L;: 11 change) 6/17/2003 39

Development of Low Frequency EA VesseD Leaktage/Integrty Inspect*on

= Probe 2-.

I =requenc~j r-Frequency Probe 2-

.5 26 1.0 1.0 Amplitude Scale Cursor Width VH Ratio TimeScale Mag 23.0 EW 0.00 V Ang 268 deg Hlorz + + Vert nnvH TOP

[ RPVH Bottom 6/1712003 40

DeveUopment of Lo requency Vesse Leai kea e/I nte r ns ec on o Picture shows Fli,us J machined grooves of ~ Firrk. B A 0.250" depth (A) and 0.500" depth (B). 44

  • Both grooves are 2 in axial length and 360 : _ 6 degrees around the sample. j.- - w 6/17/2003 41

Low Frequen Vesse Inspectin

> OD of Vessel and counter bore inspection area oMeasures degradation 00 Diverse and I complementa r'to UT <

(triple point and riverbed) o Assures integrity of OD of Vessel 6/17/2003 42

ICI BMV oOpen Cooling Shroud Doors toRemove Insulation Collars o Perform BMV around ICI Annulus 6/17/2003 43

Conch usoon

  • Combination of Supplementary and BMV inspection

. Volumetric Insp. of nozzle/J-weld a UT through wall of nozzle a Weld fusion line and Triple Point

  • Riverbed
  • CEDM/Vent Low Freq ECT Vessel Inspection
  • Leakage/degradation assessment on vessel OD and annulus region i

Diverse & Complementary inspections that ensure quality and safety 6/17/2003 44

Other Re i / xaUon

~ ~~~ ~

6/17/2003 45

ORDER ReaxatUon - Dnpecaaon of TChreaded Nozzle Cone Area

> Threaded length 134" not inspected

  • Dead Zone "0.2 inches ON Crack Growth Analysis from dead zone area to J-weld interface !9 WA. cati
  • Elastic/plastic fracture mechanics analysis o All nozzles acceptable for greater than one cycle 6/17/2003 46 i

ORDER Refaxation - Inspection of IC! No1zzfe Ends o Counter Bore affects the 2" criteria above the weld

  • Cannot see to the tipX of nozzle 6/17/2003 47

Order I AUternetve 2R16 Inspections Complying with Order CEDM (81) ICI (8) Vent (1)

BMV See alternative BlMV aroud See alternative penetratiolls UT or Wetted UTTRiVerbed UT/Riverbed Wetted Surface Surface (eddy cturent)

Complementarv Alternative CEDNI (81) ICI (8) Vent (1)

BMV

  • Triple Point NA
  • Low
  • Low Frequency Frequency Eddy Current Eddy Current Vessel Exam Vessel Exam
  • Supplemental
  • Supplemental Visual Visual_

.,- - . -- I - - -.1- .....

_...v.

6/17/2003 48

CUb slInq Rearks~

i II i

I

.i 1I 4

1j 6/17/2003 49 i

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