ML20217K486

Requests That Proprietary Presentation Matls from 970701 Meeting at NRC on Conduction & Use in Conjunction W/Wgothic Code Be Withheld from Public Disclosure

ML20217K486
Person / Time
Site:	05200003
Issue date:	08/06/1997
From:	Mcintyre B WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:	Quay T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20217K475	List: ML20217K486 NSD-NRC-97-5259, Forwards Proprietary & non-proprietary Presentation Matls Used During 970701 Meeting at NRC Ofcs in Which 2-D Conduction & Use in Conjunction W/Wgothic Code Is Discussed. Proprietary Portion of Document Was Sent to Westinghouse
References
AW-97-1149, NUDOCS 9708150264
Download: ML20217K486 (76)

Text

m N

\\L Westinghouse Energy Systems g,asy m,g,,,

Electric Corporation AW-97 1149 August 6,1997 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:

MR. T. R. QUAY APPLICATION FOR WITilllOLDING PROPRIETARY INFORMATION FROM PUBLIC DISCLOSURE

SUBJECT:

PRESENTATION MATERIALS FROM file JULY 1,1997, MEETING ON 2-D CONDUCTION AND ITS USE IN CONJUNCTION WITli Tile WGOTillC CODE

Dear Mr. Quay:

The application for withholding is submitted by Westinghouse Electric Corporation (" Westinghouse")

pursuant to the provisions of paragraph (b)(1) of Section 2,790 of the Commission's regulations. It contains commercial strategic information proprietary to Westinghouse and customarily held in conGdence.

The proprietary material for which withholding is being requested is identified in the proprietary version of the subject rep.'n. In conformance with 10CFR Section 2.790, Affidavit AW 971149 accompanies this applicatica for withholding setting forth the basis on which the identified proprietary information may be withheld from public disclosure.

Accordingly, it is respectfully requested that the subject information which is proprietary to Westinghouse be withheld from public disclosure in accordance with 10CFR Section 2.790 of the Commission's regulations.

Correspondence with respect to this application for withholding or the accompanying afndavit should reference AW 971149 and should be addressed to the undersigned.

Very truly yours, K

1 ')ll 13rian A. McIntyre, Manager Advanced Plant Safety and Licensing jml ec:

Kevin llohrer NRC OWFN - MS 12E20 9708150264 970806 PDR ADOCK 05200003 A

PDR

AW 971149

- AFFIDAVIT CO'MMONWEALTil OF PENNSYLVANIA:

ss COUNTY OF ALLEGHENY:

4

- liefore me, the undersigned authority, personally cppeared llrian A. McIntyre, who, being by me -

duly swam according to law, deposes and says that he is authorized to execute this Afridavit on behalf of Westinghouse Electric Corporation (" Westinghouse") and that the averments of fact set forth in this Affidavit are true and correct to the best of his knowledge, information, and belief:

bn w

Brian A. McIntyre Manager Advanced Plant Safety and Licensing i

Sworn to and subscribed

- before me this 9

day

- of 1997 d

A. kalds -

Notary Public 6

5 Nolanal Seal Lottame M. P$nca, Notary Pubiec.

Monroevale Boro, y County Wy Commessson Experet 14,1999 i

Memtlef.Pennsytvano Association of Notartes i

i.

a n

n

AW 971149 (1)

I am Manager, Advanced Plant Safety And Licensing, in the Advanced Technology Business Area, of the Westinghouse Electric Corporation and as such, I ha$e been specifically delegated the function of reviewing the proprietary information sought to be withheld from public disclosure in connection with nuclear power plant licensing and rulemaking proceedings, and am authorized to apply for its withholding on behalf of the Westinghouse Energy Systems Ilusiness Unit.

(2)

I am making this Affidavit in conformance with the provisions of 10CFR Section 2.790 of the Commission's regulatiens and in conjunction with the Westinghouse application for withholding accompanying this Af0 davit.

(3)

I have personal knowledge of the criteria and procedures utilized by the Westinghause Energy Systems Business Unit in designating infonnatiori as a trade secret, privileged or as con &dential commercial or financial information.

(4)

Pursuant to the provisions of paragraph (b)(4) of Section 2.790 of the Commission's regulations, the following is furnished for consideration by the Commission in determining whether the information sought to be withheld from public disclosure should be withheld.

(i)

The information sought to be withheld from public disclosure is owned and has been held in confidence by Westinghouse.

(ii)

The inforraation is of a type customarily held in con 0dence by Westinghouse and not customarily disclosed to the public. Westinghouse has a rational basis for detennining the types of information customarily held in confidence by it and, in that connection, utilizes a system to determine when and whether to hold certain types of information ir, confidence. The application of that system and the substance of that system constitutes Westinghouse policy and provides the rational basis required.

Under that system, information is held in confidence if it falls in one or more of several types, the release of which might result in the loss of an existing or potential competitive advantage, as follows:

-. = -

AW 971149 4

(a)

The information reveals the distinguishing aspects of a process (or component, structure, tool, method, etc.) where prevention of its use by any of-Westinghouse's competitors without license from Westinghouse constitutes a competitive economic advantage over other companies.

(b)

It consists of supporting data, including test data, relative to a process (or component, structure, tool, method, etc.), the application of which data secures a competitive economic advantage, e.g., by optimization or improved marketability.

(c)

Its use by a competitor would reduce his expenditure of resources or improve his competitive position in the design, manufacture, shipment, installation, assurance of quality, or licensing a similar gmduct.

(d)

It reveals cost or price information, production capacities, budget levels, or commercial strategies of Westinghouse, its customers or suppliers.

(e)

It reveals aspects of past, present, or future Westinghouse or customer funded development plans and programs of potential commercial value to Westinghouse.

(f)

It contains patentable ideas, for which patent protection may be desirable.

There are sound policy reasons behind the Westinghouse system which include the following:

(a)

The use of such information by Westinghouse gives Westinghouse a competitive advantage over its competitors. It is, therefore, withheld from disclosure to protect the Westinghouse competitive position.

(b)

It is information which is marketable in many ways. The extent to which such information is available to competitors diminishes the Westinghouse ability to sell products and services involving the use of the information.

AW 97.I149 4

(c)

Use by our competitor would put Westinghouse at a competitive disadvantage by reducing his expenditure of resources at our expense.

(d)

Each component of proprietary information pertinent to a particular competitive advantage is potentially as valuable as the total competitive advantage. if competitors acquire components of proprietary information, any one component may be the key to the entire puz2le, thereby depriving Westinghouse of a competitive advantage.

(e)

Unrestricted disclosure would jeopardize the position of prominence of Westinghouse in the world market, and thereby give a market advantage to the competition of those countries.

(O The Westinghouse capacity to invest corporate assets in research and development depends upon the success in obtaining and maintaining a competitive advantage.

(iii)

The information is being transmitted to the Commission in confidence and, under the provisions of 10CFR Section 2.790, it is to be received in confidence by the Commission.

(iv)

The information sought to be protected is not available in public sources or available information has not been previously employed in the same original manner or method to the best of our knowledge and belief.

(v)

Enclosed is Letter NSD-NRC-97-5259, August 6,1997, being transmitted by Westinghouse Electric Corporation @) letter and Application for Withholding Proprietary information from Public Disclosure, Brian A. McIntyre @), to Mr. T. R. Quay, Office of NRR. The proprietary information as submitted for use by Westinghouse Electric Corporation is in response to questions concerning the Ap600 plant and the associated design certification application and is expected to be applicable in other licensee submittals in response to certain NRC requirements for

AW-971149 l

i i

justification of licensing advanced nuclear power plant designs.

This information is part of that which will enable Wutinghouse to:

(a)

Demonstrate the design and safety of the AP600 Passive Safety Systems.

(b)-

Establish applicable verification testing methods.

(c)

Design Advanced Nuclear Power Plants that meet NRC requirements.

(d)

Establish technical and licensing approaches for the AP600 that will ultimately result in a certified design.

(e)

Assist customers in obtaining NRC approval for future plants.

Further this information has substantial commercial value as follows:

(a)

Westinghouse plans to sell the use of similar informution to its customers for purposes of meeting NRC requirements for advanced plant licenses.

(b)

Westinghouse can sell support and defense of the technology to its customers in the licensing process.

Public disclosure of this proprietary information is likely to cause substantial harm to the competitive position of Westinghouse because it would enhance the ability of competitors to provide similar advanced nuc! car power designs and licensing defense services for commercial power reactors without commensurate expenses. Also, public disclosure of the information would enable others to use the information to meet NRC requirements for licensing documentation without purchasing the right to use the information.

4 1

.1-,-

a

~

_ ~. -....

AW-971149 The development of the technology described in part by the information is the result of applying the results of r.any years of experience in an intensive Westinghouse efTort and the expenditure of a considerable sum of money, in order for competitors of Westinghouse to duplicate this information, similar technical programs would have to be performed and a significant manpower effort, having the requisite talent and experience, would have to be expended for developing analytical methods and receiving NRC approval for those methods.

Further the deponent sayeth not.

o J

ATTACHMENT 2

l AP600 PCS ANALYSIS i

i TWO DIMENSIONAL HEAT CONDUCTION THROUGH THE CONTAINMENT SHGLL' l

July 1,1997 i

by l

James A. Gresham Westinghouse Electric Corporation P. O. Box 355 Pittsburgh, PA 15230 (412)-374-4643 i

l AP600 PCS ANAL.YSIS i

TWO DIMENSIONAL HEAT CONDUCTION THROUGH THE CONTAINMENT SHELL t

i I

Meeting Agenda July 1,1997 i

I Introduction Jim Gresham Water Coverage Model Overview Tim Andreychek i

Two-Dimensional Conduction Calculations Larry Conway i

i incorporation of 2-D Conduction into Evaluation Model Tim Andreychek l

l Analysis Results Jim Gresham i

Discussion All i

, _ _ _ _ _ _.. ~.

~

Why 2-D Conduction Has Been Added l

- Calculated pressure exceeded 22.5 psi at 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> for design basis LOCA case i

i Does not meet goal to reduce containment pressure to orie half of design pressure at 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> j

i

- Westinghouse chose to add 2-D conduction model to demonstrate lower j

pressures at these later times j

2-D conduction is a real effect that is understood i

Application to WGOTHIC Evaluation Model relatively simple All other conservatism in the model maintained l

More straightforward than other changes that could be made in the model for ECS water utilization i

Does not require additional tests i

! D Conduction applied after 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> in Evaluation Model in SSAR and in j

WGOTHIC Applications Report

i What if 2-D Conduction Effect Were Not included?

Long term pressure goal would not be met j

Adequate containment cooling would be maintained j

1 Stable containment cooling would be maintained l

l Dose analysis would be unaffected (no credit taken for pressure reduction) l l

\\

i j

.. _,... _ m....

~.

~.

PCS Water Utilization in WGOTHIC Model 65 60 1

55 50 l

45 1

7 40 t

E

.o 35 s

3 30 o

N E 25

's,

20 15 1

10

~ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -......_._ ~ ~ ~ ~ ~ ~ ~ ~'~ - -'~~-

5 O

I I

t 6

+

O 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 Time (sec)

PCS Available PCS Applied (2D) PCS Appised (ID) 4

PCS Water Utilization in WGOTHIC Model 65 l

60 N 55 r

4 50 t

45

e. 4 0 s

E m 35 i

l.

V t 30 O

u. 25 i.

1 i

20 t

1 15

-...., -.:::::.::: :c: A:c:c: :::..: :,[

10 i

5 1

o i

o 50,000 100,000 150,000 200,000 250,000 Time (sec) i PCS Available PCS Appleed (2D) PCS Applecd (ID)

1' l

_ DECLG LOCA case 10 vs,2-D flim conduchon l

1-PR25 0016 j-g:

n- - e L.

I r

l

+

I E

t r

e -

10 @@tkn g i

--~~~~-

t I

/

- /\\

~u l

.0 con n

J k

l 8

1 O'

I i

j 0

1 2

3 4

i Time (days)

_ woofMC41 i

t l

e s

+

2

\\.

. s --

AP600 WGOTHIC CODE WATER COVERAGE MODEL

SUMMARY

OF METHODOLOGY l

i l

July 1,1997 by 4

l Timothy S. Andreychek Westinghouse Electric Corporation P.O. Box 355 Pittsburgh, PA 15230 (412)-374-6246 i

e-mail address: andreyts@ westinghouse.com i

1 I

Objective i

~

i-Review AP600 Water Coverage Model that models-1-dimensional conduction through containment shell; Test Data i

1 Understanding the Physics i

Analytical Methods l

~

t Spreadsheet Calculations

{

WGOTHIC Implementation j

i

\\

i l

l i

l e

PCS Flow Conditions j

PCS flogat initiation of transient;

gpm; PCS initial flow containment shell completely wetted

~

l Longer term flgw conditions;

_y j

gpm; seconds

~

gpm;

, seconds

~

l limited side wall w'etting will occur film behavior observed in Large Scale Test 213.1 i

At longer term PCS flows, alternate stripes of wet I

and dry regions occur on containment shell external surface.

Large Scale Test observations of films through complete dryout demonstrate. stable film behavior

Wetted Area on Containment Sidewall Schematic of unwrapped containment shell

?

Top of Containment Sidewall Dry

(

s

,e Region j

%W 4;

f

~etted ggmj

~

Bottom of Containment Shell

Understanding the Physics

~

i

- Using steady state water coverage data, course finite difference l

mass balance used to calculate film flow rate and film coverage ;

L STC flat plate tests j

v l

Large Scale Tests l

l Mass balance on each node constructed

- Force balance written to calculate critical film thickness, S, and c

critical film flow rate, I'c; f

i Gravitational Forces + Momentum Forces

=

l i

Surface Tension Forces Thermocapillary Forces

- Steady state data used

- Calculated film coverage; compared to observed film coverage c.

f

O e

Calculated Film Coverage

~

i 10 Degree Contact Angle i

As I

+.

i i

i f

I t

l l

Calculated Film Coverage

\\

.l 15 Degree Contact Angle t

,, c.

0 4 i

i t

f 1'

I i

I 1

2

)

i 1

\\

i i

I

~

l

Calculated Film Coverage i

23 Degree Contact Angle 3, C-l l

h I

i i

t i

r 4

I i

t l

s:

i I

O

i Summary of the Physics i

For steady state conditions, four forces at work; body forces momentum forces surface tenhion forces thermocapillary forces Relationship among these forces understood Small contact angle characterizes nature of surface irregular surface profile

> many contact angles l

j il!lI llIil t

i r r n

o oe

.r t

i f t

~

a e

dw at d

l a

e iu c w p

i ql t

l o

i a

i r

l cg e

l df n

v i

i e

,l e

d yo d

i lpe no z

pi ac y

g am d

g "w o

n fi f

e i

ox l

i o

i l

l a

o p

dl s

r o

sm ep of o

a t

a h d e

a t

C mr f

e u

wo et mim t

s s

ns c

f s

m r

o e ei e

f l

e v

l r

p n n in i

e u e t

o

~

F pt r v ai vt n

i ne s

t r a f

e f

c e

r o

o imt oe s

o t n a f

np ci r f

s eao n e o a jt p o

c v s

e n a

,, i g e

t e "e r

e ov an t ce nin r

n a

i ot end mim f

a e

hee elu r

r v

vl e e i

r Sip e c t t l

it Cg p e e ha c

Paa Dd Tc e

ff E

l i::!!

.i il

.i!

l i,

!l!

1

~

l Evaporation Limited Flow

~

l l

\\

i l

I Applied PCS flow rate input to WGOTHIC code l

calculation is;

~

j

- limited to only that flow which is calculated to evaporate; " evaporation limited flow"

- but is always less than PCS design flow i

- this is conservative; no credit taken for sensible l

heating of runoff water i

l 1

4

! Calculating Evaporation Limited Flow

~

t l

Containment runoff; l

i i

I rh

=P-W

'(1) i t

s

.m total film mass flow rate l

W total circumference or width of wetted stripes l

F film flow per unit width Derivative with respect to vertical distance; i

i dm dr dW

=W

+r (2) dz dz dz

,l!

t]

lf

I ii j!

llll e

e r

t c

o f

n f

e-e d

r b

e e

f e

h t

c m

c f a-a u

f r

e c

rh r

r u/

s sm c

i i

db d

el e

t ;

F ew t

tt t

e wo a

r t

w r

i h

tia t

t nn e

e n

u i

o n

n l

l i

i u

rt e

r ps g

g e

n n

n p

wig r

r i

i oe p

p w

fb s

s l

me m

m s

o l

r f

p o

o l

i i e

f r

r r

m t

f f

ms e

e t

i l

e f

i f ud c

c r

m h

me n

n la/

t a

a i

m nt t

t i

a t

e s

s i

i r

nb Mw d

d i

i a

l l P

=

=

=

=

y 7

e 3,

o K

F F

Z Z

,;l1l,ii!!.j ll 4

l!t l

!lt 1

lll

j l

Schematic of Wetted Stripes Sidewall Top E

OlST MIN l

l 1

Exponential Linear Decay Decay Partially Sidewall Fully Partially Wetted Bottom Wetted Wetted Test Observations Spreadsheet Calculation Model I

-w-

--i w

w e

WW "te umM%e e

a m

m v

w--

c,--w

Initial Film Flow, Foist, Model Applicati6n

- Wetted coverage of AP600 containment characterized in Water [

Distribution Tests cool water 2, c equivalent gpm applied flow 4,(.

Initial film floyyper unit width, Fast, at second weir (

ft radius)is(

lbm/hr-ft; see slide titled " Basic Assumptions for Calcuiations"

- Film flow rate per unit width at spring line related to the film width, Wsmus and applied flow rate, m, by Equation 1,

W

~P

{3) rh,

=

SP M N

where

- isC j

itG/hr-ft.

E sr

=

m

o l

Basic Assumptions for Calculations

~

i i

1 l

1.

Initial film flow rate per unit width, E msr

/

determined by distribution system i

i observed ability of cool water to spread on l

cool prototypic containment surface from Water Distribution Tests l

2.

Stripes below each weir slot are constant width while flow rate (water film thickness) reduces due to evaporation for FmsT > F > Fum 3.

At F = F., evaporation causes film stripe to narrow u

while F remains constant at F j

.. esene. *e

... ~.

\\

~

i I

l Schematic of Wetted Stripes l

Sidewall Top z=0 I'oisr Z=Z r,n

\\

u I

Exponential Linear Decay Decay Partially Sidewall Fully Partially Wetted Bottom Wetted Wetted Test Observations Spreadsheet i

Calculation

~

Model l

l)l\\Ill Z

l le

(

h Z

s

(

Z fo O

)

Z

,s e

d 4

d e

d i

m e

x s

u m

u n

)

s d

f l

z s

u w

e s

o s

e

(

a ss h

s u

s d

p L

a mi I

e a

s i

r f

a e

b ml g

e s

t l

W s

l r

g a

l o

e a

t t

a h

v r

s a

r t

t a

a d

e e

s p

o l

v i

e c

n e

t o

t s

n w

u o

a d

h c

=

i a

t i

t t

r u

o wts n

o d

b p

o n

a i

M w

F r

f o

s t

=

a i

l t

v c

n z

t t

s e

ep s

o d

n n

l i

a a

a d

c

/

mi i

r t

t c

s s

a f

W a

l l

t d

if s

i n

n it r

t o

o o

i y

C C

n F

I lan A

lll(lLl1ll!

1 i

j l

Constant I Coverage i

i Rate of change equations for m, I', and W for the constant j

width portion of the stripe are:

i dm

-%-W (4)

=

i dZ 4

l (5) dP dZ dW (6)

_0 8

dZ

's.*.

~

, I.l il'lj l:

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t i

a

~

i g

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i u

s r

q a

t a

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n c

a u

t

~

~

a t

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~

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=

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i k

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m w 'lav e

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= >n l o

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l e

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ce r

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)

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1 u

ic u

r

(

i r

u w

t t q

n o

sa e

o l

i F.d e

t l

f e

g a

m n

n u

t i

l a

a q

i n

=t h

E f

a m

n c

g i

u Fa f

n t

m nm o

i t

s e

e u

i WF.

n h

t t

n i

a t

iM R

s o

b u

C S

l

!1:

iil i!l

ti<lilf,Ill1j

ll1; l'.t

!l i!

ii! l j l\\

i,.

i!l!!t!

o a

)

t~

4 n

n 3

i o.

g

)

it d

d u

ep l

e o

o s

u le n

t v

n e

it a

d r.

t n

s:

n o

nn e

/

oo a

e c

ci t

z b

=n w

(

c s

e u

a g

.f A

h l

a Fa p

)

x 4

i

=tn e

r 1

e e

(

v Fn r

o n

o dp a

o n x W

n C

a e itao t

uit nis

=

qa a

Ec k

t n i

l so W

op i

ni s t

p o s a

t c e nt n

r oe

= p i

a x

t e

t

,e uh l

s s

4 o

Z sd n

nd a

e/

e o

hW hpe r

C Wd Ts

,11ll<

lL!llit

!lll:

Ii l

!l!!ii

i a,.

i l

Schematic of Wetted Stripes i

l Sidewall Top Z=0 1

/

I'DIST i

/

\\

z='-fA-,_

i Exponential Linear Decay Decay l

l Partially Sidewall f

Fully Partially Wetted Bottom Wetted Wetted Test Observations Spreadsheet i

Calculation Model t

i

,i i

l Source for F,31 and I-o i

l Constant input values for source, Fmsr, and minimum stable l

film flow per unit width, F

, are obtained from test data '

Value for F is based on observations from PCS msr Water Distribution Test and conservative assumption that water covqr, age of containment shell is never l

greater than

. % of the total circumference Consistent with test observations, assumption made l

I that film thins while the film width, W, remains constant, until F., is reached i

Thinning of liquid film until Fui, is reached and film l

narrowing afterwards is consistent with observations l

from Large Scale Test l

Value of F, bounds test-dita

~

4

! F Versus Test Data MIN i

Film Flow Rate Versus Heat Flux S

1 i

i i

I l

1 I

[

L S

l 1

1 l

j

~

i l

~

Evaporation Limited Flow Calculation Equation 14 will always predicts some water runoff.

From WGOTHIC calculations and test observations, l

all water applied to containment shell can be evaporated.

l l

Thus, preceding spreadsheet calculation method is conservative.

Conservatism is applied to calculations by reducing the PCS source flow used as an input to WGOTHIC calculations by amount of predicted run off.

This reduced flow is defined as the " evaporation limited flo,tv.

i Basic Methodology l

l 1.

Average evaporation heat flux, ta, at selected time (s)

)

determined for wet WGOTHIC climes below lower

~

l weir; evaporation mass flux is o, = o /h n

g 1

l 2.

Runoff, m p, calculated for each time using Equations a

l 7 and 14 if constant evaporation mass flux l

3.

Runoff, m y, subtracted from the water source, m.

or l

and difference is input to WGOTHIC l

?

4.

WGOTHIC is run with modified source input; results for input to Step 1 to recalculate used to define og l

runoff, iterating on average heat flux.

Convergence reached when o from WGOTHIC consistent n

with, but not lower than those used for input to Step 1 i

WGOTHIC Treatment of Wetted Area Schematic of unwrapped containment shell Top of Containment Sidewall Dry Area Bottom of Containment Shel1

i l

AP600 Passive Containment Cooling System l

Two Dimensional Heat Conduction Through the l

Steel Containment Sheel l

i l

L'.'E. Conway, Principal Engineer Passive Plant Support Engineering NRC Presentation,7/1/97 Rockville, MD i

t i

h Westinghouse Electric Corporation NuclearProjectsDivision i

P.O. Box 355 l

Pittsburgh.PA 15230 l

saammaans M-8 i

)

l l

AP600 Passive Containment Cooling System (PCS) Two-l

~

l Dimensional Heat Conduction through the Steel Containment Shell BACKGROUND The PCS water distribution tests showed that I

When PCS applied water flow is reduced to s; 120 gpm, the containment surface will be only partially wetted in vertical stripes.

f i

l The wetted stripe widt,h,(and % coverage) is dependent on l

Fasr = constant =

Ib/hr-ft

% based on testing to 55 gpm.

i The PCS large scale heat transfer tests were performed with the l

l l

shell entirely or mostly wetted, such that only radial conduction l

l (1-D) was occurring. (An exception to this will be discussed.)

l

{

l Oh I

~

AP600 Passiva Centainmsnt Cooling Systsm (PCS) Two-i Dimensional Heat Conduction through the Steel Containment Shell i

BACKGROUND (Continued) h:

i Current WGOTHIC only considers radial (1-D) conduction through,

j l

l shell, such that at 20 psig containment pressure, the following l

generalized conditions exist:

i

- Inside containinent air / steam mixture is 217.5 F (well mixed condition) t q

j

- Wetted portion of shell has inside surface temperature of -

jF, and outside i

l temperature of -

(

JF.

j pc-i i

_ 3,c

- Dry portion of shell has inside and outside temperatures of -

and;-

F, i

~

l respectively.

T l

l No heat conduction from hotter / dry area (s) to cooler / wetted area (s) assumed, in spite of 30 F temperature difference and high steel I

B tu - ft 24 l

conductivity of h r - ft,

, F i

l i

i sauemm e.eemer s

Wetted Stripes and 1-D Conduction i

Containment Shell Temperatures inside Containment with only Radial Conduction inside Containment Steam / Air Mixture @

O psig, 217.50 F 217 F @ 20 psig i YI

[. NN

$N 9

Denotes 4

\\

4 wetted t

stnpe Air Flow

]

Path Baffle l

i.

lF

[

• F

• F

,N 130o F AirOutside Containment i

k:j I

A Steel Containment

( N A

Shell @ 1.625-in thick i

j i

Cooling Air @ 130.F

AP600 Passiva Centainment Cooling Systsm (PCS) Two-

~

Dimensional Heat Conduction through the Steel Containment Shell 1

BACKGROUND (Continued)

Conductivity between regular wet / dry vertical stripes will significan,tly 4

l raise the temperature of the steel surface (and water film) in wetted areas.

I i

The regular wei/ dry vertical stripes that will occur on the shell will have a significant impact on the overall water evaporation and heat transfer l

rates from the wetted areas.

l l

r

j AP600 PCS 2D H2at Cenductinn Geometry of the Wet and Dry Vertical Stripes on Outside Surface Wet stripes are the consequence of:

i k

i

. The water distribution weir V-notch spacing a

t

. Weirlocation 1

.- e r

l

. The constant r ssr (

, Ibs/hr.ft. (,

gpm/ft)) at application flow rates s o

l 120 gpm which results in stnpe widths = application rate r

1 i

I Water Distribution Weir V-notch spacing 2.c 3. c._

32 water distribution channels, each with V-notches (

notches j

l total)

(

. V-notches are spaced at 6.5-in. intervals 5

. Each V-notch with r ssr Provides o

l

- at 120 gpm; streams 4.25-inches in width

- at 63 gpm; streams 2.23-inches in width i

em esseemer s

AP600 PCS 2D Heat Conduction Geometry of the Wet and Dry Vertical Stripes on Outside Surface i

i Water Distribution Weir Location Water distribution channels located at ~51 ft. radius l

i l

Streams follow natural fall line to the vertical sidewall j

Center to center spacing of stream increases proportional to l

Increasing radial position.

l

-2c-r

- 3 '-

l r

At vertical sidewall, streams have' inch spacing i

j i

I i

i 1

1

-l l

j 2

i i

.sm wsswe

i i

l i

N p~

e l

9

• l.

,s e.

9.:

.s,-

s/

o i

l y,

...,..-a.

l :.y s-

=

,.y '

• o "{-.. '

.k"

4. *,;'>, qq '.4 r

w,.,.

..g.,...

0, j ;>

~

.t i 2:0, TEST D' NUMBERRATE GP

~..

(

.1 i

Figure 1 AP600 Water Distribution Test Facility 12

AP600 PCS 2-D Hsat Conduction Heat Transfer Boundary Conditions

~~

Boundary Conditions for 2-D Conduction ANSYS Model j

e Series of steady state calculations at pressures ranging from 10 to 65 psig (24.7 to 79.7 psia)

Verified calculation using same methodology as in WGOTHIC including

{

conservativeaultipliers on heat and mass transfer inside Boundary Conditions e

Completely mixed air / steam mixture assumed.

t Heat transfer coefficients to water film multiplied by 0.74.

Heat transfer coefficients adjusted to account for inside water film and j

paint conductivities.

Calculation establishes steel shell inside surface temperature based on inside mixture temperature and overall inside heat transfer coefficient.

sagaenensefteGF F a

AP600 PCS 2-D H3at Conduction t

Heat Transfer Boundary Conditions Outside Boundary Condition (wetted)

Heat transfer coefficients from water film multiplied by 0.83.

j t

i Water film and paint layers considered to obtain outside steel surface 1

i temperature Second degree polynomial curve fit used to define wetted heat transfer vs.

Steel outside surface temperature l

Outside Boundary Condition.(dry) j l

I a, C Btu /hr-ft*- F Dry heat transfer coefficients range from

. boC--

Constant heat transfer coefficient of used to model dry heat transfer l

l I

4

Qilff7

/GvfE-iJ-;

Conservative Wotand Surface Heat Transfer Coomcient vs. Outside M Surface v-_.____

g 4

I

-a b

t l

l l

i l

PagerT

i AP600 PCS 2-D Haat Conductinn ANSYS Model Description ANSYS computer code is a verified finite element program used commercially since 1970. ANSYS Rev. 5.3 used.

2-dimensional thermal steady state analysis method used with periodic f

e half-cell model.

Half-cell model'(cross-section).

- >.e p.e feet [t

- in.) thick, corresponds to AP600 steel shell thickness.

u g.c.

._ w

(

feet (

-in.) wide, corresponds to spacing of outside water vertical strigies. ~

1-foot unit length.

24 Blu-ft/hr-ft - F conductivity.

i Right and left side of half-cell are adiabatic boundaries (assumes symmetry).

em esessor e

~

~

.s t

luser n

)

o d

n ne r

nu e

tt n

a it cit p

. un e

- do d

U nC o

e(

y n

r e

Cn a

t d

a d

t o n

u e

ai u

a l

t l

i l

l p

e o

v p

Hi c

b e

p r

f y

o a

Dc l

r t

s a

d s

-2e h

/

d D

n e

e n

t S

w m

o i

i s

r t

l Ce e

a f

i t

o d

Pd d

r n

o o

d e

0 n

e p

o 0M s

c 0

u y

6 0

d y

P S 8

g u

r n

t a

A Y d

s d

i S

n d

N a

o y

n t

u n

i s

v o

A t

y it b

n t

i i

e s

s m

n n

e e

e e

d i

d s

l s

e r

g t

0 e

n u

0 h

d O

i g

4 g

o e

/

1 i

n

~

h n

d id i

o s

W N

n i

sum N

e a

s

[l l(li1 1

l fl 1

i l1 i

l

~

j AMsYs S.3 i

27 2 Ptor eso.

1 Zv el i

??"::!'i!!'

~

Yr

=.047708 2-surrEn Mc

(

l t

u Containment well 2D thermal conduction. 20peig. 25% overall coverage Figure 4.4-f:

Meshed Model

assevs 5.3 any e 1991 17:e1:30 etar eso.

I erst.t roet 1

84ll

.au..ei <

isooi Pto?

tava a

se002*44

!?,,:'.,.

ar

.s

['

+ ttM.40s '

sesurrsa

• t see.g.4 '

4.

59.,33 '

i elpt..as '

• t se..pt '

• , St.,4 79 '

• Sea.. W '

f e l.88'll e

o pe n.474 i

i 5..

i

..e.

4 e..

.H8 l i.e.

l.,.D

.4.

.. t.t DIST coa.so..

ii no..n i.

. ii....ii......

Figure 5, Thermal Flux in Y-direction on Outside Surface of Containment Wall [ Btu /hr ft']

.h.M.,,S v 6 1. 3.,

, 3,s.i, i

PLb? seo.

3 POST 3 STEton SUS e1

• 'I 36* '

T!wton PATM PLOT teo01e223

• " 8 **e '

38002 a 20 3 SV ei DIST*.1%

RF e.S 3* DUFFER

• a

.l.9'

+493. Sn. '

.te.. go. <

e.ep. 9e4 '

a I. b4.

9. '

. i.es.. '

, t. e.s e i s

.... wi.

I i

i i

...i

...e.

..e DIST e-..

ii >o..

i.

.........ii........

Figure 6, Thermal Flux in Y-direction on Inside Surface of Containment Wall [Bru/hr ft']

15

1 AP600 PCS 2-D Heat Conduction ANSYS Model Results Outside surface heat transfer for wet and dry areas obtained.

j o

0,5,10,.. 90,95,100% wetted; 10,15.. 45,50 psig containment pressure o

cases analyzed.

l 100% wet (only radial conduction occurring) beat transfer rate used to o

normalize partially ipetted heat transfer rates to the 1-D rate.

L Enhanced wetted heat transfer at 10,15,20, and 25 psig are bounded by o

single polynomial expression used in spreadsheet for calculating net applied i

l water for GOTHIC.

P '* r "r

i 2

Y =I x* +

L

- x l_

x+

lx -

_1 t

.i l

\\

wetted area heat transfer rate enhancement factor i

where Y =

fraction of containment surface wetted x=

I t

i l

4 Figure 2, Normalized Water Evaporation Rate (2-011-0 Conduction) vs.

^-

the Overan Containment Wetted Fraction 2, c-1

-s.,

)

+

6 e

l i

bimuumumb e

k-9

e

)

1 j

i b

1 i

9.3,7 AAFS Y S 1.

i Mhv 0 11:30:54 d

, tot eso.

3 e

l ImeA,1 90WT10sf pts.1 T 1 s.es.1 sue t

1 1

tuar. 387811 i

i Ta rc.3. 0 3. 5 3 9 j

sua.s1,.....

a.

1 3. n.

9 i

WET I

DRY l

r.

j k

I i

e.... i -.... n 3.. w. ~ i. m o. n,.i.. n.

.....n......

I Figure 3, Temperature Distribution through Containment Shell Steel Wall (Top inside surface, Bottom outside Surface AMSYs 5.,3,,

as,e 1 11e2 :14 PLOT too.

3 NODAL SCWTIC88 STEPet SUS *1 TIMEel TrY tAVG)

R$Yse0,13 SMW e.2 swNee.3131 SF.X e.221 231

_-...n.....

M

334,

• "p L.. : %s..

ita;

==

t

'5

. n 3.

cm

..n o

=

l

. i n,. o n

=

.aa m l

n i

e I

I I

L l

e. s.....

n

3.. s.~ i. m u. n,... n.

.....n Figure 4 Total Thermal Flux [Bru/hr R2]

!l

l I

i 1

4AASYS 1 3 sky 8 1991

!?iel:30 PLOT 100.

POST 1 STSpel e.g.e i

• - +

lf PhTW PbOT 80001 e &

.ges, a go <

18003e44

~-

S

• SUF F B ft e s see.t.e '

e stee. r. '

• I64. 4.S '

e se ese '

e

• b 5E5. 0 99 '

+ 3aas. M '

8 43

.ye es. e's.

i..i t

..e,

..e.

OIST e...

ii 2....

t......... m..... i........

2 Figure 5, Thermal Flux in Y direction on Outside Surface of Containment Wall (Bru/hr ft ]

.S,9 u mAY 0 1991 11 01:50 D LOT Iso.

3 POS?!

Sittet SUS s1

• FT', ans '

ggMge&

PATM PLOT

1. 4001 e 3 2 3 nod 3e202 8V e1

• . i s *es '

33Sie.?S g

u*

e S YF e.%

atee.of' gr e g 1 tJFFtst o.as. ti. # '

r 9

4. Ba. '

• M h. '

• .sp. to. '

= 4..e.e. '

• ,99. 498' t e s.ee = e n

., i

.e.

oIsT e-..

iiS..-i.....

. m.....ii........

Figure 6. Thermal Flux in Y direction on Inside Surface of Containment Wall (Bru/hr ft']

l'i

AP600 PCS 2-D Heat Conductinn Insights From the PCS Large Scale Testing 1

Two matrix tests were run which have approximately the same boundary o

conditions with the exception of the applied water flow and wetted surface area.

x c.

l l

i l

l j

l l

)

l a

Test Run SOC evaporated same amount of water and had same overall heat removal as 48C, with significantly less wetted area.

I 1

I Tem hoseem 1811 Rev. 9 FIGURE 2 TEST DATA ai!EET WATER COVERAGE DATA s, c.

4 i

W m

o.Jd/h /5/ff 3

9 si.~:

1

......~ne iu w. win 32 FArd !M$

I Tea Powr.d m 218,1 b.O FIGURE 2 TEST DATA SHEET WATER COVERAGE DATA q a, c--

e n*%

Date /lf 9.7 Time' 12 ** 3 *C s

Si 13 Nit:

f

~~

AP600 PCS 2-D Haat'ChnducItion ~

~

~

~

insights Frcm PCS Largo Scala Tcsts 48C and 50C

,, e e

i e

S i

I

{

t I

i l

/

I easame ens steer-te i

i i

i h

3

AP600 PCS 2-D H;ct Csnductirn 3

l Insights From PCS Large Scale Tests 48C and 50C i

3.c-4 a

I i

I 9

i p

=

i I

L

.2

.wamer.ir j

l AP600 WGOTHIC CODE

~~

WATER COVERAGE MODEL j

APPLICATION OF 2-DIMENSIONAL j

i CONDUCTION HEAT TRANSFER IN j

THE CQNTAINMENT SHELL j

i July 1,1997 i

I by i

Timothy S. Andreychek j

Westinghouse Electric Corporation

(

P.O. Box 355 Pittsburgh, PA 15230 (412)-374-6246 e-mail address:' andreyts@ westinghouse.com I

l Summary of 2-Dimensional Conduction.

l i

Increased evaporation of applied PCS flow from the outside surface of the containment shell i

Dependent upon wettert width of regularly spaced

)

l vertical stripps created by water distribution system l

at reduced PCS flow rates i

i l

Calculation of evaporation rate accomplished by l

iteration between spreadsheet and WGOTHIC I

t i

i i

l l

i l

~

1 1

L Wetted Perimeter, W, for o (Z)

J u

i l

For axially varying o (z), a general expression is written.for j

m numerical integration:

l W - h(z) - AZ l

(16) 4W

=

f l

emu W, - 6(z) - (Z

-Z,)

2 W

= W,-

(17) l 2

F I

ann l

1 Knowing W from Equation 16 or 17, mass flow rate, is calculated from Equation (1).

2 mour I

Runoff flow rate is m pp

=

W(z = z g)F m, where o

u u

W(z = z g) is value at bottom of the ccntainment u

shell I

Incorporating 2-Dimensional Conduction.

- WGOTHIC models 1-dimensional conduction through containment shell i

l dimensional conduction increases evaporation at a

given containment pressure

- Equivalent evaporated mass with 1-D conduction to svaporate same mass as 2-D conduction is expressed as ratio of wetted perimeter to containment sidewall perimeter (W/Wo):

i 32

- ;' 33

_ y,c b'

-r 44 W J W

W W

(15)

M

~-

Wo 3W; W

'l W

(

o2

{

t o

t o;

a.

i 1

where wetted perimeter of containment, ft W

=,

Y total containment sidewall perimeter, ft Wo

=

.. M is the ratio of o. 2-ol"u.1-o

)

m j

)-

l

l jIll l

ll!

!l es m

,d d

de gt s

a c-e, p e

ni r e

,g c

op l

r ef

]

u y p e

v~f d

e a e

ol e

b i

l r

n ca p

~

do n

~

s ni r

it eo f

a c i

t ti o

l l

a s le t

u u

n e

h nd we u

s en M

,m a

t l

io s

di v

n nc od s

e al n

i-r o wd m

r a t n o

epw on t

f o n

oo l

i t

c a

n s i

ti a

Sd he t

in r

Cn gs n

e s

i Pa h]

o dm o

c nis

)

p we m

ode f

g t

a o

o o

o, c o a, swr a

r l

e f r f

e v

e E

hv s[

g go et a

]t no r

r f

hc ca e

oit i

u v

f a

l,)

^ d,m o

r r

o g

e o ep c

ip i

r, t

w]g n

[lpa s

r n

e miv l

o a

i t

(

o t

e l

gh m a

ou i

l t

ngs f[

W Fmt r

o a

ni S~

c u he

~

Co r

~

s Dia Pt i

l p

p A

l i

l

!l l-ll ll

WGOTHIC Equivalent 2-D Heat Transfer i

Schematic of unwrapped containment shell Top of Containment Sidewall c

f Wetted Area l

i AV) j Additional Wetted Area for 2-D Heat Transfer SwMAwMsMhxa sexemwn:w l

Dry Area

)

Bottom of Containment Shell f

j f

.. - -_ _. 7 - -.

Summary L

- Method to calculate the evaporation limited PCS flow at fixed j

average wet heat flux has been described l

- Method to conservatively bound and account for two dimenssonal heat conduction in the containment shell to liquid stripes also described f dimensional conduction through containment shell Consistent with LST evaporating film observations Increases evaporation rate of PCS applied liquid Benefit to predicted heat rejection rate of PCS Consistent with bounding methodology for other modeled processes

- Equation relating 2-D evaporation as a function of wetted fraction of containment shell defined

- Time for which multiplier may be applied identified.

i

" Evaporation limited flow" obtained by iteration i