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Summary of 990414 Meeting Held in Rockville,Md to Inform Stakeholders of Progress on GSI-191 Study & to Address Concerns Raised by Stakeholders at Public Meeting Held in Nov 1998.List of Attendees,Agenda & Copies of Slides Encl
	ML20207D105
Person / Time
Issue date:	05/05/1999
From:	Marshall M; NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
To:	Jocelyn Craig; NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
References
	REF-GTECI-*, REF-GTECI-NI, TASK-*, TASK-OR NUDOCS 9906030208
	Download: ML20207D105 (75)
	v • d • e

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UNITED STATES g

j NUCLEAR REGULATORY COMMISSION q

WASHINGTON, D.C. 20066 4 001

&y 5,19W MEMORANDUM TO: John W. Craig, Director Division of Engineering Technology Office of Nuclear Regulatory Research THROUGH:

Sher Bahadur, Chief. b Engineering Research Applications Branch Division of Engineering Technology i UELic CCCUMENT ROOM Office of Nuclear Regulatory Research

(

'99 MA1A P4 :19 FROM:

Michael L. Marshall, Jr., Mechanical Engineer T Engineering Research Applications Branch Division of Engineering Technology Office of Nuclear Regulatory Research

SUBJECT:

GSI-191: 1999-04-14 MEETING

SUMMARY

A public meeting was held at NRC headquarters to inform stakeholders of the progress on the GSI-191 study and to address concerns raised by stakeholders at a public meeting held in November 1998. The purpose of the GSI-191 study is to assess the impact of debris accumulation on sump screens on emergency core cooling system performance. A copy of the meeting agenda is included in Attachment 1. A list of meeting attendees is included in. Copies of the slides used during the meeting are included in Attachment 3.

The technical presentations focused on the debris accumulation risk assessment work and the debris water-bourne transport work. It should be noted that slide 22 on page 11 of the risk presentation, that an editorial error has been corrected. In response to comments received from an earlier public meeting, the RES staff clarified the application of the study results, incorporation of risk in the study, and relationship of study to other RES efforts. It should be noted that on slide 9 of the overview presentation, that an editorial error has been corrected.

Attendees were invited to submit comments to the GSI-191 Project Manager via electronic mail, cc: Meeting Attendees k

in Qf p Q h 9906030208 990505 PDR ORG NREB PDR A

O O

AGENDA U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research Rockville, Maryland Wednesday, April 14,1999 TIME PRESENTATION

_ SPEAKERS 9:00a-10:00a General Remarks M. Marshall, NRC 10:00a - 11:00a Description of Postulated Accident D. Rao, LANL 11:00a - 12:00p Discussion of Risk Assessment Work J. Darby, LANL 12:00p - 1:00p LUNCH 1:00p - 2:30p Discussion of Debris Transport Work B. Letellier & D. Rao, LANL 2:30p - 3:00p General Discussion M. Marshall & D. Rao i

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GSI-191:

Assessment of Debris Accumulation on Pressurizer Water Reactor Sump Performance (PWR Sump Debris Blockage Study) km maou

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FEEDBACK FROM NOVEMBER 1998 PUBLIC MEETING e Phenomena identification Ranking Table Panel e Risk Assessment e Clarity oPurpose of Program ORelationship to Coating Study cincorporation of Risk Insight Oh) 2

rU OVERVIEW:

NRC CONTACTS RES Project Manager:

Michael Marshall (301)415-5895 NRR Lead Technical Reviewer:

Robert Elliott (301) 415-1397 NRR Project Manager:

Donna Skay (301) 415-1322 N

Los Alamos National Laboratory (Technology and Safety Assessment Division)is the primary contractor.

LANL Principle Investigator:

Dasari "DV" Rao i

(505)667 5098 p

r3 (M) 3 OVERVIEW:

REGULATORY AND SAFETY CONCERN e 10 CFR 50.46, " Acceptance Criteria for Emergency Core Cooling Systems for Light Water Nuclear Power Reactors" Requires All Light Water Reactors to Provide an ECCS That is Designed to Meet Five Criteria o One of Those Criteria is Long-Term Cooling of the Reactor Core.

e Debris Blockages May Prevent the injection of Water into the Core of the Reactor

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OVERVIEW:

REGULATORY AND SAFETY CONCERN Continued i First, the accumulation of debris on sump screens (or strainers) will increase the resistance across the screen (or strainer) and thus reduce the NPSH available to the ECCS Pumps drawing suction from the sump.

i Second, the accumulation of debris at the sump screen or along the flowpaths on the containment floor may form dams that prevent or impede the flow of water into the sump and thus the water in the sump can be drawn down which will reduce NPSH available to the ECCS pumps and effectively reduce the water inventory in the sump.

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'M) 5 OVERVIEW:

REGULATORY AND SAFETY CONCERN Continued COVER PLATE

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TRASH RACK / DEBRIS SCREEN 1

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NRC STAFF PERSPECTIVE:

NEED FOR THE GSI-191 STUDY

+ The resolution of USI A-43 was considered equally applicable to both BWRS and PWRs.

. In light of the resolution BWR debris blockage study the NRC is reassessing debris blockage sump screens to determine if there is a need for further actions to be taken for PWRs beyond the original resolution of USI A-43.

e Determine if Have a Safety Problem o Analysis With Enough Empirical Data To Support Determination o Analysis Should Be Applied To Reference Plant e if a Safety Problem is Confirmed, Then identify Resolution 8F Study initiated to respond to a NRR's user request memorandum.

7 NRC STAFF PERSPECTIVE:

NEED FOR THE GSI-191 STUDY Continued

?

Debris seration Debris asport Debris Head Imas smce 1983, a number of facton have beca identified that would clearly increase the he loss assoc te of det s genern g postulated arcident.

since. it is not clear if tie amount of debris 9

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r-NRC STAFF PERSPECTIVE:

APPLICATION OF THE GSI-191 STUDY

If Not a Safety Problem, Issue information Notice Regarding NRC Findings l

= If a Safety Problem, issue Generic Letter Si

'lar to 96-03 and Revise Regulatory Guide

.ht Rev 60lleT)*

= If a Safety Problem, Review Licensee and Industry Submittals and Analyses rm Q!6),

9 l

RELATED RES ACTIVITES (PROJECTS)

SRTC Coating Study oEstimate Amount (%) of Debris, From Oualified Coatings, That May Be Generated Following a Postulated Accident Outside of Zone of influence oProvide a Description of Failed Coatings Outside of Zone of influence

CSNI/NEA IWG oReview And Summarize Exisiting Imformation on Debris Blocakge of Sump Screens I

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13 GSI-191 STUDY:

GOALS i Determine if the transport and accumulation of debris in containment following a LOCA willimpede the operation of the ECCS in operating PWRs.

O Determine if There is A Need For Further NRC Acton To Be Taken For PWP.s Beyond That Taken During The Resoluton of USl A 43.

i If it is shown that debris accumulation will impede ECCS operation, develop the technical basis for revising NRC's regulations or guidance to ensure that debris accumulation in containment will not prevent ECCS operation.

k if it is shown that debris accumulation willimpede ECCS operation, provide NRC technical reviewers with sufficient information on phenomena involved in debris accumulation and how it effects ECCS operation to facilitate the review of any changes to plants that may be warranted.

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GSI-191 STUDY:

APPROACH e To Extent Practical (Possible) Calculations and Models Will be " Realistic" l

o identify important Phenomena and Plant Features o identify important Parameters o identify (or Develop) and Evaluate Models

Models May Be Empirical, Theoretical, or Combination There of o Compare Models to Separate Effects Experiments o Integrate Models e Bounding (" Conservative") Calculations and Models May be Used o if it Has Little Effect on Results o if it is Not Practical to Develop " Realistic" Models

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15 GSI-191 STUDY:

APPROACH Continued e Phase 1 o The Primary Objectives

Review Available Work Concoming Debris Blockages of Sumps or Strainers and Assess its Applicability To PWRs

Collect Plant-Specific Data From PWRs

= identify Debris Sources in PWRS

Evaluate Methods to Predict Debris Transport in PWR Containments o The Secondary Objectives

Evaluate Methods To Predict Debris Generation in the Zone of Influence

Determine What Testing, if Any, is Needed WThe NRC staff will review the preliminary findings from phase 1 of the study and make a determination whether or not the findings are sufficient to

conclude

that debris accumulation in containtnent will not impede the operation of the ECCs.

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GSI-191 STUDY:

APPROACH contwad e Phase 2 OThe Pdtiay %jectims

Develop Predictive Models to Assess Debris Generation, Debris Transport, and impact of Debris on Emergency Core Cooling System Operations That Can Be Applied to the Spectrum of Containment and Sump Designs

Develop Guidance On How To Evaluate the impact of Debris Accumulation on Emergency Core Cooling Systems j

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Make a Determination Whether Debris Accumulation impedes or Prevents the Operation of the Emergency Core Cooling System OThe $800nday @jectiVe

Estimate the Risk Associated With a Debris Accumulation in Containment I

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17 GSI-191 STUDY:

ACTMTES e Phase 1 oDefine Postulated Accidents

Containment Environment

Plant Response

Operators Actions oCollect Plant-Specific Information

Updated Final Safety Analysis Report & Individual Plant Evaluations

Plant Survey

Reference Plant Visits o Review Available Literature

> Identify and Evaluate Debris Sources

Identify Experiments that can be used to benchmark Models

Review Usefulness of Models and Analytical Approaches

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ACTIVITIES Contnued e Phase 1 oldentify important Phenomena and Plant Features

From Reviews and Experience of LANL & NRC Staff

Phenomena identification and Ranking Table Panet OReview and Develop Models

Composite Plant

Reference Plant

Water Boume Transport

Two Phase Jets ORisk insights

Identify initiating Events and Their Frequencies

Identify and Review Risk Assessments

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Accident Progression Scenario.

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Debris

Description:

Large 7 _ _ g4 eg..,.....,,'J 54 %

e' g*

., f.4 ~.

Q.

., i g g4h[,.',VT

' s.,,, i Tyytest Mass of Frupsums: > 1 pm

/,j.p seemsg Vesseery h wensr: us M

.j p, 1 N' k

Sseeng Velmetty is Air 18 M

_A

.s

. ' y.

Smallhg Valmetty in Air Wee:30 M

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e h. ',

a.,,,

, _ g,,,

3.g.

-- ' ~-W we -

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Debris

Description:

Miscellaneous y y _ _.-

s e - y 1

1 rwm s s, s=== se= tap rutne ne=ess are sA ases.TWN.hsees,DED

(

Puy W 96 w

9 p.-

, _.n...

. ~ ~. _...

.. - ~

W.... _..-,..............,.. -- _..,......._._..

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l Debris Size Distribution: BWROG Data for E

120 TotalDebris

).0 i

m an x

A

\\

v.

s 0

to 30 30 40 90 to 70 00 90 a__. t * - ^^tPhto 3

N Nm,.twxY,

.e uo

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CAD Drawing of Large Dry m, 7

,a'k

. nL#

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PWR Containment Designs: Large Dry l

InternalDiameter:100-150 ft i

a Free Volume: 108 - 2.5x10* ft*

Design Pressure: 30-60 psig

^^^^^^^^^^^^^^

11 11 Design Temp. 300 *F Quench Tank for Safety and h

g,j PORY Discharge n $anuurunru,& w Tan Coolers for Cont. Eeat an u

ym

?y Q

";d Cont. Sprays (Automatic)

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) PWR Containment Designs: Ice-condenser Internal Diameter:100 ft Free Volume: 1.tx108 ft*

a faaaaaaaaaaaaaa Design Pressure: 10-15 psig f

g Design Temp.: 250 *F ii Quench Tank for Safety and a

ed

[

PORY Discharge Fan Coolers w/ Ice-Trays

' r-uyeumAu.

Cont. Sprays (Automatic) v

_)&@k

,Sr 4 )

a

=d

=

c L

D n.'-

- -.. ~ m.o.mW.

g Paramenes far meer D.msms ces as DlSuunt D

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Apr9 341995,7WN, Beesea,MD rige A 23 I1 n._._-_.

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Blowdown Debris Transport: Large Dry v.........

m c. g......

,c,................ c. n

. a c....... c....

of

&AAAAAAAA&&A&&

1

/

Flow has no dominant direction o

- Velocities > 30 fvs away from the tutak location

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J into upper and lower catamrnent and annulus

,f//

- suing e&hes in the open ens turbunence iririerer. -

O

Small debris would be distributed through

.,C,

'i,,.

out the containment

\\u c

. Large debris either on floor or gratings x

~

. All distribution done in < 30 sec

- 1 v..

a rwa s s=,twx,n

, com u

= sa m

~1 a,,e u, ma un I

ri mu n Y

Blowdown Debris Transport: Ice-Condenser t.perunw.

N r

u T.

t)

Pm w.

M M

0-awa cm..c ep e 4-1.w.

STA SM i

1.

i

Flow has some dominant direction Y

.. ' '4 1

m ee

- Velocities > 30 fi/s avsy imm the break h'9.

- - y locataan irao apper cent. and im-condenser v'.

j i & si m A s m

_m r

v i:

Small debris would be distributed

.,.1~"/(j

'b throughoutthecontamment m

p_, -

[#* -

$ Large debris either on floor or gratings

'7 e.1Ma$

All distribution done in < 30 sec 3

u..r.,.1.

M ry,s,,,,se si.e P. m us :

l

p.,

AprSlA1995,TwN,hme qhs uD rug Mu M l

12 w.-.

e v -,,

e

'3-(,

O Cont Spray Washdown: Large Dry Containment SpraysIntroduce Water upusooooru

/'i' 8 '

r tape pm s.m m l I Smalldebris would be washed down

. f

.1g

" endesse d @

l%q W

' i

3 Simple Scopens Nh Candna

'iE, "' "

4'f Bisak Mow Emdes Debris right Beneath Debris in the MoorPool

..aa

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a..,

Withis 10-20 main alldebris would be

-M f:4

'a la the Pool fdF1

.E

.,;, -].3 e

p..c..... r..

rwa n== s = an ea, pense ne-e.s Ape i TWN.B e es.teD G )

Cont.SprayWashdown:LargeDry Containment SpraysIntrcduce Water Upto sooooru "A%.MMFJ'h$@3L

[il "g

j

Smalldebris would be washed down LJg Empenmeant evidence l

ia J

?

P,1,5 simplescopias nicuissionscostum c

d

...y,3, 44 Break Mow Erodes Debris right Beneath

,,,1,,,,,,An

~4 Debrisin the Moor Pool

~

., - - c

=

h

.}

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H,,5 '..-'j

,==

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Within 1015 min an debris would be

- ~

J 3

i J

l ca. r...

p" e - p.m. -< r1 yWas,s anseaprehActendag APS 54.19m.TWN.asukes.W rap ha.t N 13

= - - _.

6--*

f M e +-w.we> 4 War mpeg

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+4==****-'****-**'M**e-*p>e---*

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7 LENL Calculational (g- ) W,ashdown Transport:

\\.....

Time at which debris washes down and reaches Dooris critica!

- laser the anival. the more likely for transport to screen

- Depends on the containment spray._

Using MELCOR/CONTAIN oedes

- Time dependent structure water film thickness

- Use of acmalreference plantcontammentlayoutinformauon i

For generic plaats f

- Treat time at which washdown is completed parametrically

- PIRTPanelinput J

rwa s-e s m ai.e.g r.nme u-o.:

Apre 64 39EE.TwM.amaveh MD rier = n 7

I j

Floor Pool Flow Dynamics: T/H Results FoolBuilds up Gradually with time Initially no direction for water movement.

Debnis moves tolow velocity regions

- Turbulence may keep debris in =p== ion i

1

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0 6._

,i C 1

e m

4 Time aherLDCA Time sher LOCA J

rwa sem,sma anskap.P.nac Mmens Ayra 141918.TWh,hanves,MD ragtN 3 14 F im e 4r *

>=0ge sm +-w w pre y.

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e-eM-=*e*esum*****

.*-**.=-*-we es-*se S

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Gravitational Settling in Quiescent

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Time A8m Chumpeg h.phs Wasmyys stamme s

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rwa same e st. mass renas in-e.s s

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Transport in Floor Poolto Sump v

v emmameAas

'How Starts Only After ECCS Switchover

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y J.Y 4 9 $~[

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Factors Influencing Flow Patterns I

s

Location of SumpWith g

N Respect to Break

- InsidetheCranewall: Break Turbulence Can Keep Debrisin

/

/I II.

- OutsideCraneWall:hastthe g

local flow panernsinfluence 4

j trnsport

(

I ECCS Floor Rate Structura11mpediments E\\

- Narrow pathways

" FJnfu-

- Channels 1

rwas s-m.a runneu s As.9 la1984 TwN.anesths,MD rugele.J 38

/h j

Floor Transport: Controlling?

Debris Reaches the Poolin 10 20 mins. after LOCA At the end of 10 anins Pool Height 2 to 3 ft ECCS Recirculation Switchover Between 15 30 anims.

Allows for Settling before Switchover ResidualTurbulencelevels 0.e. Flow Panerns)

Debris Size and Terminal Velocity Directionality to flow after switchover Pool Height 3 5 ft(sorne even more)

Flow Panerns established by Rectreulation Debris Size and Terminal Velocity J

rwas,mm si.es.rnseu ess Apre la 1995.TWN, asukemie,uD Pagerem: at 16

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Debris Accumulation: Controlling?

Dalforsn Deposition em Susap Screens

- Orientation of Sump Scieses

- Sump Screen Area or Height

- Debris Chrbs: Heevier debris may not set past castis Partial Blockage of Screens snay not be a concera

- Screens designed to perform with 50% blockage (RG 1.82, Rev. 0) i l

i 3

L

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h si ama-adhus espammme in amup sommes J

i Pwm same,seems sam.sp Peter sammans Apre K 391s.T N,asshe be Pup Ms.: 3B l

l.....j Floor Tran=r=* ZhaseI Approach Setest a CPD Code Wh M Medals w e-

-e eine sunne uness

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Passey of Tees

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. Simodsen TwedesP Pusi

Odessant Pool Centeises

Nasr Pamed Transpure

. hyesmews guuksseems

haste. Ptse pattares

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hesilsetr Plant Generwv 9

' [.[:' AsimpoTrenapwtMmWM,j

..y;aa.sh&LMQify PIRT Panel

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l l

Assessment of Debris Accumulation on PWR l

Sump Performance (Y-6041)

Risk Associated with PWR Sump Screen Blockage during ECCS Recirculation i

Presenters: J. Darby and W.*Ihomas Technology and Safety Assessment Division los Alamos NationalLaboratory Los Alamos, New Mexico E i N. N 'a % T

l l

I )I f

Objectives

= Xssess Risk Significance of Loss of ECCS NP5H Margin due to accumulation of Debris on ECC5 Sump Screens

- Qualitative Evaluation of 'All' Accidents to Identify Those Affected by Debns l

- Quantitative Evaluation of Accidents Impacted by Debris l

ACDF and ALERF: Metrics for Risk Significanoe 1

- Interface with Phenomenological Evaluations 3

heem M-eg e rwa n==e sw seer Apre 34,1999.TWFN. Raskiega, MD Page k 3 1

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(.....

Risk Related T.sks 1 Identify and Assign Frequencies to Initiating Events for which ECCS Recirculation from ECCS Sump may be Required for Mitigation 2 AssessImpact of Debris on Risk 3 Conduct Risk Study for Reference Flaats 1

runaw me smes rma s==,on mase seer Apre 8419H.TmTN. Asutves.DS PIWIMhJ 3 g.....,.C........

M esimaise Seemans & Susanges

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e.

L J

F l

enamenses W trasmens en Risk huhastemsist h Mahmudig W taas W placue, susan g

.nsa syntas,ue w osawn

.Enscoe neopsuun tremens

. Pepe oser Peeksen troot.us W ommen8 k

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. E8ect 088P

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in

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- 1 Definitions EC CS Redaden

Resirestados ofWater Sresa Ce= tat=====e Susay for Core / Centat=====* CoeMay after Seusee ofInjoeties (RWST) Depleted Use of Plant Systeens te r" ^~ "-^

SSitigate am Resident '=8+4=+ing Event per Freeedazos wkh Au Required Systeams Avanable Use of Plant Systeses other

"" ^~ "^^

than Preferred per Procedeses due to rausres in Preferred Systesn(s)

CN Prehabuity of Less of ECCS Flow due to Surny Screen Blockage by Debris given Presostbed Set of Pre-

% Events 2 Reeevery of " Failed" Systesa, e.g.,

Throttling of ECCS Pusnps, Refuting RWST 1

r== a*=m.. rwa s., ame, s.or

)

A,pu n tops, prM,hoewan,as e ms i

Qu&litative Evaluation Identify Accident Sequence Initiating Events

- Potential Source of Debris Identify 'Proferred' Strategy for Mitigating Eack Initiating Event

- Use of ECCS Sump for Core / Containment Cooling Identify ' Alternate' Strategies for Mitigating Each Initiating Event

- Use of ECCS Sump for Core / Containment Cooling Prioritise Accident Sequences for Evsinaties

- Finahze Prioritization after Quantitative Evaluation J

rearns

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+--er**

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w am+

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/

Quantitative Evaluation Frequencies ofInitiating Events Potentialfor Generation of Debris Frequencies of Core Damage and Large Early Release I

Effect of Debris in Sump on Mitigation Strategies Sensitivity to Loss of Sump Update Qualitative Prioritization l

l J

p.mu m

- r. s,

Ace itim. twin,m em ruphea ?

Y l

Input to Phenomenological JLasessment Tasks Specific Accident Sequences

- Initiadng Event

- Preferred Mitigation Strasegy j

- Alternate Mitigation Strateges Specific Conditions for Use of Samp

- Timing, Flow Rates 11 ternate Strategies to MinimizeImpact of Debris l

- Minimize Flow Rate from Smap l

- Alternatives to Use of Sump 3

l renau m.aue = rwm s =, no.aar sums Ape l4 3999.TwrN.had.mn.06 rey me.: 8 4

m o e M %4W GD $ - 9 44W' M9M@ 6

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Assumptions Sufficient NPSE Margin Exists for Recirculation from ECCS Sump if No Debris Kocumulate on Samp Screen

- NRC GL 9744 Issue.

Sources of Debris 1

- Jet impingement effects due to energetic expulsion of water / steam into containment

- Degradation of containment coatings due to high containment temperature / pressure from release of water / steam

- Foreign materials NOI part of debris being addressed

- Impact,if any, of failed coatings already present in containment MAY be included 2

r ~,N"aAY Ym A,,e :

LKNI Progress to Date Qualitative Evaluation Complete l

l

- Initiating Events: FSARs,IPEs, NUREGs

- Preferred Mitigation Strategies: FSARs, ATOGs,IPEs

- Alternate Mitigation Strategies:IPEs, ATOGs i

- Qualitative Prioritization of Accident Sequences for Detailed Evaluation Quantitative Ermluation Underway

- Will discuss methodology in this presentation l

l A9fe $4 heeth ruerw se 5

C C. _.,_ __ Z.1........ _.... _ _.. -

__. _ T.;~~ 7:~ ~. -

~~~~"

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~

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T I

Initiating Events LOCA Considerations:

- 11rglarge, Medium,Small,Small Small(lab 4 racks)

J

- Losada Discharge inside/outside Containment, sevation reladve to top of Cost Bevation relative to RHR for Shutdown Cooling, Imcation relative to RHR Shutdown Cooling Purnp Section' Discharge Ahmev to Mair Relief Valve Block Valve. lso me SGTR Transient Considerations:

- ATWS

- Non A1WS Discharge Fluid into Contamment

Evolve toIDCA: stuck open safety / relief valves RCP seal LOCA

~

'runne Mammag en rw a see, semimap semer ApS B4 ttpe.TwfN.asiewes.Mo rio,w u f)

)

Preferred Mitigation Strategies LOCAs

- Isolation if possible

- ECCS Injection (normal makeup for small-small)

- ECCS Recirculation froen Sump

- Steam Generator Cooling for Small LOCA Transiosts

- SteamGeneratorCooling

- Mitigate as LOCAif Evolve intolhCA J

renar M.= mig rwa u== **smar sumer APG 841999,TWFN.Basken.94D rugsNed II 6

W8EDWMM"# N 0-Meg 99$W' W eW

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Saw

9+

h=**W*N*'*W'N#*'***'"""^h"*****--4*

9-=9**

" " " ~ ' * * -

='

I. *,

Alternate Mitigation Strategies: LOCKS Throttle ECCS Pamps to rainimise screen and piping head leases

- Operstarrecogmanslossof::cCS

- 71souhag Suf5ciently Reduces Head Ims; NPSH,,,,,, seenns to > 0 Refill Searse ofInjecties Water and Continae Injecties instead of i

Switching to Reciosalaties l

- Imag bus soone of barated woest segmund 1

- Tune to Renil Source ofImpseman Waaer

(

Need to address overall of ca=======it For Small LOCA, Depressarine RCS and Use RER for thatdown

[

Cooling l

- Amount of Makeup Reduced (C.,__

i J)

No Makeup Required for High Sevation Breaks on Suction Side of RHR (RCS Valves Open.SGTR)

- Tuning of Depressmuanon imponent (EOPs)

M"m7-e mT*

)

Alternate Mitigation Strategies: Transients Feed and Eleed if Steam Generator Cooling Lost Depressurize RCS and Use RER for Shutdown Cooling

- Depressurize SG Secondaries

- Depressurize RCS with Pressurizer Spray and (if--y) Relief Valve (s)

- RHR SDC pulls from Hot leg and injects into Cold leg (or Core Mood Tank 1rdection une) 2 m?

W Apre 6 r~a 7

9 eeavp 4e a

g,s-g,e...pe gwe.

m.

.m 4

C 0

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Alternate Mitigation Strategies Canth j

= Tianlag of Actions (e.g., reS115eurce of ECC51ajesties)

Me Direct means to detect E5ect of Samp Debris (psmp Gowrote, ymmy meter surrent, pump messe)

In FWR Core Coellag Water Must be Berated to Malatala

+

Ekstdows Margia below Est Eere Powwr OverE11 of f**=*=i==nent with Continued Injectica

+

Idenitations sa Depreassrisation of RCE (thermal stresses

+

en eempements)

Omidance in Emergency Operating Procedures p.ne.c u ru n s

.e Ar.eitim,twrxm

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(.....

Effect of Containment Conditions Containment pressure and temperature aNeet thermodynamic state of ECCS Sump water whick aNects impact of Debris on ECCS Rectre =!=+8a=

Core Cooling Strategies Dependent on:

- ContainnatCooling

- ContainmentIsolmion

===w

-J rubec Messag en FWR W Daushage temsy 1999.TWrM. h.ekstba,9@

AprS84.J M hen 98 8

=. ~ - ~ - - -.......... -..

f....~..,~......-....,...-----

f j

Qualitative Prioritization Cosenery Teses of AerMeets by Caesmery A. In the preferred svensgy some ImpeIDCA debris can be generseed and ECCS Medium LOCA Sump Recscolanos15 sequesd Emall1DCA laserfacing Systems LOCA in soommasat Transises that eassinos so RO' seal LDCAs Transions involvina RCS valves coenins & falEns to Reclose

s. la ime prefened sereingy some sannannu LOCA debris can be generased and ECCS Tresa involving RCS valves opening & sociosing (or Semp Recuseleman 15 NOT block valve h closed if sehef valve fails open) sequesd Transsenes ther discharge fluid isso ha=== but that do not evolve into1DCAs ATWS Tr-- 6 s in which RCS valves Reclose t

C. In the prefened strategy NO debns None idsno6ed to date guerhaps gransients for wluch rehef is genersiad and ECCS Sump valves open since discharge is so quench snak; perhaps Recuculsoon15 seguired renseens for which safety valves open if valves discharge to cuench tank)

D. la the prefened stracegy NO dehns Transients that do not discharge fluid snoo.

is generaasd and ECCS Sump Recirc 15 NOT sequhed haarneumae = rwaammesessassises, Asse 34 tese.TwFN, Rashes,he nor w n

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i Generic Event Tree: LARGE-LOCA

[gg h

$dB M bNM M

Lass' bduseum hasimaneus 9tmpfebres (Caumen Diesesne emme mme ausmenum) a AdBCA teens ammys LLOCA ist 6sst suasP w

.W e

00LN

.=

w 1DCA Jets imquingement

. Debris is generseed

.Inp Coatsdasment Teamperesures

.ICCE Restre is Piended c-=ai-- - sysums as shows for machelqr J

rumme nessese-rwa num, sammans emar Apse 14 8889.TWFN.Raskets,SS puesfew 18 9

1%<a.ren-wg..,,,,,e,,.,,.,,,3,,,,.,.,,

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Las of acs varas seem sesener msh men esenerosan Ham Feed waar Ommed & RCP n

pues pessmse Pummme Naghytde en Ree8'ery wnh Ru Tne Semis inurt Ceolma OK and thod layrson L-'

Laut Sciese N imJumml LossFw 4.ocA sGCLA PB MPI HPR SUIsP CoeffBW on OK OK l

LocA l

Consmannet syseums amt shows for i unplicity Debris could be generated as a resak of RCS Valves g, m wg g or feed and M

.Soane Debris unny be generated

.1a==la'Las due to aguench tank ronef e

.ECS h is M M

. Palot chips doe to containment high tasapers J

1 renes no sus rwas,samame ses, Apre 841999.1wFN,bedritus,MD Page W D

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Transient Evolves to LOCK

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A runne u mas rwa s==e sw seer Apre 641989.TWFM.Esuk'88.8#

PageNot M 10 1

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LBLOCA: ConventionalIPE Treatment "

gas pegamy, Ime premure ESmm af tiuhrts hussary 18'8'

gagnema, andrudsens penghgitis em tr-Quesenne N

(Den Sump)

Emme heart hsgustem)

&JACA LPl LPR SWRIP w iw e

OKN

.m Data Used inIFE Quantscation IPE Data 110CA e 2 sled tyr. IJ'l+LPR = 5alpa SUhtr o it' COpfTINJeSJ (somme===ad ed) (seem ed met eremo on J

rumme u mas rw a saan9 sa amasi saws Apr0 841999.TWFN, Roskvik MD rise pen.: :

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g I

Impact of Debris Xccum. on CDF: LBLOCK g

LLOCA*

LPl+LPR SUMP CONTINJ OUTCOME

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CFD Pool-Transport Modeli s

.:c:: =.,. a Public Meeting on PWR Sump Blockaji Bruce Letellier and D.V.Rao Probabilistic Risk and Hazards Analysis q

Ios Alamos NationalI.aboratory 1

April 14,1999 TWFN,Rockville, MD 4

CFD Modeling Objectives fu

. uc0:.=.

,^W -

Parametrically investigate effectiveness of pool transport

to the sump screen:

- Sump configurations and flow rates; break locations and flow rates; debris types, sizes, and spatial location, effects of local obstacles.

- Tune / space distribution of debris depend on LOCA accident sequence.

Identify combinations of potential concern:

- Sumps inside/outside crane wall, critical flow evgunes, etc.

Determine gross transport factors.

Distill bounding control-volume flow correlations or potential-field flow equations for plant-specific screening.

Help identify and design debris transport experiments, roa.rmurm uaru,w.rws sawmm 1

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CFD Modeling Components

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Flow-3D'isbeingusedtomodelturbulent s~

transport during pool fill and steady-state recirculation.

NUKON and paint-chip particle-transport parameters benchmarked with available experiments.

- Flume debris-transport tests (ARUPP&L)

- Zion-station paint chip transport test (CDI)

Realistic containment configurations constructed for volunteer reference plants and for composite features.

- Scenario-specific global pool movement and turbulent energy

- Opportunities for resuspension of settled debris w w w u w me.r. ras w 4,,, m rwa.a, CFD Modeling Components (cong nrica

Describe time-dependence of debris buildup at J' screen for use in detailed head-loss calculadoes.

- Conservatively neglect actual bend loss during buildup and assume bulk flow rates are constant.

- Record particles and cumulative mass that reaches screen.

Evaluate vulnerability of specific sump screen designs to the maximum acceptable debris loading.

- Screen head-loss calculations and NPSH evaluations give maximum acceptableloading.

- Release maximum loading into steady-state flows in " sump zone"under various conditions.

w r,,nru st.is.r.,a au u

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ModelingApproach a:

a,,:ac

1. Full containwnt floor to investigate debris location and during recirculation.

- Requires coupling with risk assessment scenarios and MElf0R containment model to provide accident progression

What water return pathways are present back to the floor?

= Does debris collect near or far from sump during pool fill?

Can debris migrate long distances during recirculation?

2. Region influenced by sump velocities to investigate entrainment and buildup (" sump zone").

- Is debris resuspended by local turbulence?

- What sump features mitigate accumulation?

us um.a sana. arm rarreurarrunerw.resas Containment Floorand Sump Zone n

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Benchmarks of Particle Transpon Parameters y*

Steady flow (1 ft/s)

Paintchips 3 to 4 mil inorganic Zine and 10 mil Epoxy

= NUKON fiber

- Turbulent flow (0.25 ft/s with downcomer injection)

Paintchips

NUKON fiber

- Fiber entrainment over weir

. Weir height 1

. Weit height 2 Las Annue NaammlW Paol-Troupon M& law. Page i Overview of Calculations (cont.) 5 "A~'CT m Sump in annulus far from break (Reference 1)'w_g

- Full containment floor

= Paintchips

NUKON fiber debns Sump zone

Paintchips

NUKONfiberdebris rool trauron u*Ius. Pare 3 Las Atenwa mttakumany 4

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- Full containment floor Paint chips a

NUKON fiber debris

- Sump zone

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Flume dimensions approximately 3ft wide x 1.5ft deep x 10 ft.

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~~Composite features oflarge dry containment' floor 7 developed from actual plant plan sections.~~
~~Features include: major obstacles, dead volumes, narrow outlets, multiple active sump pits.~~
~~Have added debris curbs, doorways, and crane wall penetrations.~~
i Examine:
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- Ttubulent kinetic energy
- Particle transport j
i im Alamos Narimallahermory Fool-
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l Preliminary Conclusions
_A n;.::
~~Fiberdebris~~
- Smallest size classes remain suspended in regions oflocal j
turbulence
- Easily transported to sump
- Some settling to and motion along floor
- Significent resuspension over sump cmb
~~Paintchips~~
- Rapid settling to floor
- Global migration on floor but pile up at sump cmb
- Minimal resuspension over curb.
um.asaan atw raat.rr.urm usin. rme z
Future Work Plans e
ca; c:n;~:n
~~M:xiify FLOW 3D' to improve functionality:~~
- Report particle accumulation in the sump volume l
- Customize physics of floor transport
~~Mat paint chips cuy exhibit adhesion and extreme shape factor~~
~~Particles currently roll with no friction (conservative)~~
~~Investigate sensitivity of results to spatial resolution and numerical options~~
~~- Use cumulative sump loading as an integral metric l~~
~~Begin CFD cales in simple geometry to validate use of potential flow theory for regime of low approach velocity.~~
~~Couple CFD cales with MELCOR accident sequences for break location. spray initiation, recirculation, etc.~~
w e,,xmm rar,wrm uaern.rwu 33
,

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