ML050390467

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Steam Dryer Loading Analysis Technical Review, January 25-26, 2005
ML050390467
Person / Time
Site: Dresden, Quad Cities  
(DPR-019, DPR-025, DPR-029, DPR-030)
Issue date: 01/25/2005
From:
Exelon Nuclear
To:
Office of Nuclear Reactor Regulation
References
Download: ML050390467 (84)
v • d • e


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  • Tuesday, January 25, Introduction 2005 Purpose Scale Model Testing (SMT)

Acoustic Circuit Analysis f-Finite-' Element Analyses, (FEA)

Dresden Unit 3 Strain Gauges.:

  • Wednesday, January 26, 2005

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QC1 Scale Model Test

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- Original dryer and 2003 repair with short gussets models, Pre-extended power uprate (EPU) and EPU flow: rates from Quad Cities Unit 1 (QC1) SMT

  • 2004 dryer repair FEA results QCI SMT with original dryer EPU loads QC2 acousticcircuit with original dryer EPUloads:

Dresdenh Unit 2 (D2) acoustic circuit with original dryer EPUoloads-:

  • Replacement dryer models
  • Replacement dryer loads QC1 SMT with replacement dryer EPU loads QC2 acoustic circuit with replacement dryer EPU loads
  • Planned replacement dryer analyses 10

GE SMT Load Validation Analyses GE Proprietary{3}

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  • Original dryer cover plate close to failure when subjected to SMT pre-EPU loads
  • Original dryer is'overstressed 'at locations that failed when, subjected to SMT EPU loads Cover plate stress at:49059 psi Outer hood at internal :5"x7"bracket stress of 37120 psi'
  • QC2 2003 dryer repair is overstressed at.rfailed locations when subjected to SMT EPU loads Cover plate stress at 38450 psi Outer hood at gusset tip stress of 29802 psi
  • SMT loads predict prior dryer operating experience and provide a reasonable basis for dryer qualification 22

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  • Local 3D solid element models of trough support blocks, trough mid-support attachments, tie bar supports, :etc.
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  • Analysis o design basis loacdsand stress analyses per:

design specification loads and acceptance criteria 58

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- SMT loads was shown to be adequate for 'replacement dryer design based on foriginal' and repaireddryer structural performance

- QC2 plant load.applied,.to the new drye ris a

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  • Stress analyses being performed by multiple, shell and 3D solid, finite element models to determine peak stress concentrations for fatigue-analyses

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Nuclear Sensor Cover Plate Update I D CFD results recommended the multi-sensor cover plate design to be replaced with the single sensor cover design Results show 6-7 % frequency shift for:

the multi-sensor cover versus'+/- 3-3.4 ~% for..

thesingl covers-Reduced--the diameterbfJIthesIngiesensorLII; cover plate from 7.25" to 6.5" Additional analysis being performed using 3D CFD analysis and wind tunnel testing to refine the 1 D correction factor results 63

New Dryer Instrumentation (cont.)

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.U=xeAd,"" 0 OKAI $AA

  • Loose Parts Discussion All sensors, mounting pads, cover plates, conduit clamps and cable clips will be welded in place Conduit clamps spaced every 7" and cable, clips'.spaced-as.necessary,to

:ensure 'secure, attachment.'

Mast will be bolted-to brackets which are welded to the dryer surface No reports of lost dryer instrumentation components after installation and single cycle operation in the past

  • 'Nuclear
+/-

l

..L.

Installed Accelerometer 64

New Dryer Instrumentationj(cont.)

Ulu=

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Nuclear Loose Pt D.

n.

  • Loose Parts -Discussion, :(boht..)~

Instrumentation component design

.and installation techniques. prevent loose parts from being generated s

was,

- A generic loose partsanalysiswas.

performed for Boiling Water e

actor Vessel Internals Project (BWR VIP) 06 65

New Dryer nstrumentation g

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Cam Nucl ear Instrumentation Installation

- Routing of instrument strings performed using 3D modeling-layouts.

.- Instrument-mast to be,

,temporarily installed at US iTool &Die (UST&D) for,

,proper string-routing, and removed for shipment Final mast installation to be performed 'at Quadcl Cities

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.- Total of 84 sensors to be mounted'

- on the main steam lines.

  • 6 Accelerometers welded to pason th ryer 27 Pressur sensors welded
to pads_ on the dryer,;-25"

housed in the cover plates

'on the inew' dryer <

and

'-9,Strain gauges spot welded directly to the dryer 42.Strain gauges spot welded to'the main steam lines I

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67.

New Drer y

nstrumentation (cont.)

i

'11

. xe onm Nuclear

  • Installation of Strings Sensor installation to take. place-at UST&D-

- Sensor functional i

testing to be.performed.

-.,,.upon receipt of.stringa,

-shipment, and also--

after dryer fabrication and string installation complete is 68

.New; Drer Instrumentation (cont.)

. M

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,.. t,

E : i ' -:N uclear Project Milestones Final functional testing Shipment of strings Installation window begins (UST&D)

Hammer testing begins Uncertainty analysis-fina ized

-. Allowable :limits/criteria finalized 11~~~

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elt~nS Nuclear Quad Cities 10 CFR 50.59

:: f;
:Eval u ton; :;0
S a0 A Doug Collins Senior Engineer -

Quad Cities Nuclear Power Station 70

Topics II xE 6kn 5M 50.59. Evaluation. Summary

  • Enclosure Design

'Enclosure Segment Assembly.

Nuclear
  • Dyer, Enclosurek Sceule
  • Co'n~clusions 71

50.59 Evaluation Summary kin Nuclear

  • An alternative secondary containment boundary, meeting the applicable design/licensing requirements, will.bein place prior to removing the reactor building:(RB).sidin'g:

.Secondary containment will -be protected.-to';;the extent requiredto prevent any, adverse impacts onthe plant There is no. increasein-.the-,frequency of any-accidents or transients as previously evaluatead in the UFSAR

  • There is no increase in consequences (dose), as:the

'alternate secondary containment boundary::will'-be in place while the RB siding is removed 72

505 valuation Summaryl (cot

,

1 xe, n.,

Nuclear

  • uin es ole 'cutting contingent~ mtoswlbeipace, toimdiately restore,:secondary containmetMwti h

required Tcncal Secifcations(S timhe peridi required

- 'Contingency meas~ures are designed to be intled. immeitl within the 4hur liiigcnition" fr ope'rat6 io~n ;windwaledb the TS

  • The actvit does not excee d oalethe 'desg ai prsuelimit as d'escribed ~in the;UFSARadteei no change to. any evaluation nmethodology as -'described. in the..

UFSAR 73

En'closure Design xe Nuclear-

  • Design The outer door and: enclosure to be designed for tornado maximum

.wl

-a.dditi.on.al.

wind speed (will eliminate need to assess.the impact of additional

-missiles),

- Design will meet seismic conditions Outer door-::_

Will osisto steel frame, with het meta onbi

.:between '(door will be hinged to the reactor buildi ngsuperstructure steel columns)

Enclosure:

Will consist of steel frame with sheet metal welded on one side (enclosure will not be insulated due to the short timeframe it will be in'use) 7 4

Enclosure Design (cont.)

Nuclear Enclosure airlock:

Will be installed.to allow access to theinsidebof the enclosure (each, door will have a light to provide a visual aide to indicate when the

.other door is open)

  • 0Utilities

-, Some limited utilities for power and lights.will beprovided

--.: est connections to Dbe provided on the doorand.enclosure, (upport leakage testings)-

eka age-estin 9.

.,g.) ;

75

Enclosure Segment Assembly X

sm Nuclear

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76
Enclosure Segment Assembly (cont.)

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EcoueSgmenrt Assemby (cont.)

Nuclear 41

Completed enclosure asseml

'79

- Leakage -Test ng;-

Outer' Door Installation I

e, i :o n., S

- :;:-00-; :::;Nucklear to~sdi

, ;em....a.

Install outer door and siding attachments prior tanrt-lci ma inctnilsionf nn

%.Pi Sw~wJI 16AL 11 I'.JLLA4IILALI1JI I Test outer door-to-siding (pressurize air space between outer-door and siding, snoop/s'moke test for leaks.- test is for information only)

Perform baseline secondary containment test of reactor building wvithdoor ~aja r:~

ir

'Test outer door-to iding' (c'ut 4" hoe in 'exterior sidi'g d perform secondary containment test,- contingency.'packageto patch hole if test fails) 80

Leakage Testing (cont.)

Nuclear Enclosure installation for Unit I dryer-Install 'enclosure on refuel floor-

- Test enclosure-to-outer door (pressurize air space between.,..

enclosure and new outer door, snoop/smoke test for leaks - test is, for information only)

Test enclosure (open outer door perform:secondary containment tes)

.1

-* Enclosure Removal Close outer door Smoke test outer doors, remove enclosure upon completion

  • Enclosure Installation for Unit 2 dryer Install enclosure on refuel floor

- Test enclosure-to-outer door (same as for.Unit 1 dryer)

- Test enclosure (same as for Unit 1 dryer)8 81

e

'Fs in.o!

Leakage Testing (cont.)

Enclosure Removal xe6' t

leu l;Xuc aT3 S

- Close outer door Smoke test outer doors, remove enclosure upon completion as for Unit 1)

(same

  • Outer Door Removal, nstall t'beams and inner siding

-,-.'Testouter:door-to-inne'r siding (information test the same as for outer door installation).

Install outer siding Test siding (perform secondary containment test with outer door removed) i z ! i 1 1,

1, 7  :

82

SSummary I

AS&,,

AAM,

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u

= Onsm a

on ---;im

_Nuclear:

  • An alternative secondary contanment: oun, ary, meeting the applicable design/licensing requirements, will be in place prior:to removlngthe.

.RB siding,,

Second con tainment wbetransitioned t new,,, undary in a controled m-anner, while secondary containment pressure is monit.ored

  • Contingent methods will be available to restore secondary. containment: at the.RB

&siding boundary within

-hours, if required 83

dNuclear 4%

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