KR0101293

KAERI/TR-1814/2001

Experimental Study on the Air/steam discharging load

of Safety Depressurization System(I)

2001. 4

04

# 2000

2001. 4. 20.

- i -

n.

containment

IRWST ^ ^ ) ^ ^ 5 t i(air clearing)^^ ^ ^ ^ ^tf. ^Hl t f l^x^^A^ i27fls]

in.

(5m m > l0mm)4 P/d *(3.2, 4.7)

# 30

IV.

1 €- ^ ^-(d=10mm)7f

4.

- ii -

v.Unit

unit cell

- Ill -

SUMMARY

I . Project Title

Experimental Study on the Air/steam discharging load of Safety

Depressurization System(I)

n . Objective and Importance of the Project

In the Korea Next Generation Reactor (KNGR) design, the SafetyDepressurization System (SDS) plays a great role in reducing the coredamage frequency and improving the severe accident performance of theKNGR. The actuation of POSRVs results in a time-varying high-energyflow of air, steam, two-phase, and liquid from the pressurizer into theIncontainment Refueling Water Storage Tank (IRWST). The successivedischarge of water, air, and steam induces thermal hydraulic phenomenasuch as a water jet, air clearing and steam condensation, and thesephenomena impose the relevant hydrodynamic forces on the IRWSTstructures. In the KNGR design, totally twelve 6inch I-type spargers willbe installed in the IRWST. Therefore, an understanding of the relatedphenomena such as the characteristics of dynamic pressure loads is aprerequisite for the design of the sparger and IRWST structure towithstand the pressure loads. In the present study, four 2inch I-typespargers test were performed to characterize the pressure loads at thequench tank wall as a pre- stage of a unit cell test which will beperformed by using prototype sparger of the KNGR.

IE. Scope and Contents of Project

To investigate the pressure loads behavior in the quench tank during the

air clearing period, four different spargers whose P/d ratios and

discharging hole diameters are 3.2, 4.7 and 5mm, 10mm respectively were

tested with the variation of pool temperature in the range of 30 to 95 °C.

In the present report, the main description is focused on the test facility

and the pressure loads behavior on the quench tank wall.

Thermal-hydraulic behaviors in the depressurization line are not included

- iv -

here.

IV. Result of Project

The geometric configuration of sparger such as the P/d ratio and

discharging hole diamenter, d, affect the characteristics of pressure loads

at the quench tank wall. The peak pressures of discharging hole diameter

10mm are greater than those of 5mm. The dominant frequencies are

increased with the pool subcooling temperature and P/d ratio.

V. Proposal for Applications

The present test is a pre-stage test of a scheduled unit cell test which

will be carried out by using a 6inch prototype sparger of the KNGR in

KAERI. By the present test, the basic behavior and measuring technique

of pressure load can be derived. Moreover, by comparing the unit cell test

data with the present data, the effect of the size of sparger will be

evaluated.

- v -

CONTENTS

SUMMARYGn Korean) ii

SUMMARYGn English) • iv

CONTENTSGn English) vi

CONTENTSGn Korean) vii

List of Table viii

List of Figure viii

Chapter 1 Introduction 1

Section 1 Background 1

Section 2 Phenomena during blowdown 1

Section 3 Objectives 3

Chapter 2 Test facility and method • 4

Section 1 Mechanical system 4

Section 2 Instrumentation and control system 6

Chapter 3 Results 15

Section 1 Phenomena description 15

Section 2 Dynamic pressure 16

Chapter 4 Conclusions 30

References 31

- vi -

JL ^ Jg. ii

SUMMARY iv

CONTENTS vi

^ *} , vii

3. ^*} viiizz %!•=-;*} viii

all 1 # >H ۥ 1

4| 1 ^ ^ ^ s f l ^ 1*)] 2 ^ ^7l«ov#A] -fi-^-^Aj- i

4 3 % ^ ^ ^ - ^ ^ ^3}- 3

*)] 2 ^ - g ^ ^ l ^ ^ ^ yo

v ^ • 4

*fl 1 ^ 7|7fl ^11- 4^] 2 *i ^ ] # ^ ^ l ^ T f l ^ 6

8 3 ^ ^ ^ ^ ^ 15^ ^ I^^Ti^- 15

16

30

31

- VII -

Table 3.1 Test matrix and technical specifications of spargerTable 3.2 Test Conditions and Results

Fig. 2.1 Flow Diagram of the SDS (Safety Depressurization System)Fig. 2.2 Schematic diagram of test facility and locations of temperature and

pressure sensors in the pipingFig. 2.3 Sparger's Dimensions and Set-Up in the Water Pool TankFig. 2.4 Thermocouples' Locations in the Water Pool Tank

Fig. 3.1 Detailed drawing of KNGR spargerFig. 3.2 Temperature trend in the piping during blowdown periodFig. 3.3 Pressure trend in the piping during blowdown period

Fig. 3.4 Image of water/air/steam discharging stages (Sp2, TP=84°C, PpzR=117bar)

Fig. 3.5 Typical pressure signal induced from successive discharging of water,air, and steam

Fig. 3.6 Trends of the maximum positive amplitude with a variation of thesparger and the temperature of pool water

Fig. 3.7 Variation of the dominant frequencies with the P/d ratio of thesparger

- viii -

1 S- M

, In-containment RefueUng Water

Storage Tank) ^ ^7]^A>7](sparger)l

. IRWSTfe ^^>S ^^-^^^o]u) . A > J I ^ | « | ^ containment

H«.(POSRV : Pilot Operated Safety Relief Valve)7|-

Ali:Bfl(Safety Depressurization and Vent system)0]

^ «ov# €r^(Feed and Bleed operation)*

. P0SRV7> ^ S | ^ i i u i ^ S l # , ^7] , ^

A^4 #7l^A)-7]i- -f*)] I R W S T S . £4£)?fl 5]fe ^i

t ^ * } ^ t ^ r ^ ^ 3 ^ 1 »M, IRWST ^ ifl(water clearing), i M ^^(air clearing), ne^JL §7]Hj-#(steam discharging)^

IRWST*

2 ^ ^

"• 1 —

4. °1°W 1

^i)7> 2 ^ ^o f l <^ He] 4-^4. #°1 water jet* ^ W S ' H £#(water

clearing)^ °1* -OL^AS. <&#€ -717]- £ # 3 A3. £#(air clearing)^ ^

discharging)€4. IRWST

(initiation process), ^ ^ y J -#4^ (steady-state discharge

process), zie]jL ^^4^(termination process) ^^.S. ^-g-sl-^cf. o]^<^]>| ^2:°!] ^

ffe 4 ^ ^ : 2:71 oil

1. 2:7] JZ}- (initiation process)

^717}-

2. ^ cHo1" ^#4^(steady-state discharging process)

IRWST ^ #£:&7> #5 f ^4 . o] 4 ^ f oi) ^^s\^ # ^ £ S 7 l 4 ^ ^s l «g- 6fl a]

ABB-Atom Forsmark 1

7c! (chugging)4 -ir^^condensation oscillation) ^

3. 2) 4 3 (termination process)

reflood

- 2 -

3

^ IRWSTi £ i € i ^ °14 . ^ 4 1 ^7l^A>7]^ 6 1 1 (Schedule 40S, ANSI

standard)^ 4v-§- » 1 t i ^^ y o v ^i 10mm3 ^ W ^ 1447fl, yj- - oi] 25mm3 f^lyov#^ I7fl asl j l ^ f '^^CLRR, load reduction ring)ol

^ 3 ^7l^A>7ll- A> -«)-7fl € unit cell test3 ^ #31^1

7l^^ ^^§Uxl 26JA13 « M i 5,

unit cell tesH] •§-•§-€ r &J1 #7]^x}7l3 3 7 H 4 ^

— O _

Co E D oA l : * :o E D o A l : * : S a o 1=1

(Bolwdown and Condensation) test facility)

1. 7\°^7] A% 2. ^ S 711

4. ^ 7 ) ^ ^ TJl f 5.

2.14 2.2i xMt

[4]oil

, IRWST* £ 5 1 ^ ^2(quench tank),

IRWST1: <d.%*\3L

7PJ71 Tjl - - 7><a-7l a.^1, ifl^- heater, 7)]#-g

1 l ^ heater

SDS ^

fe ifl^- ^]#o) 600mm, ^ 4 ^o l7} 3000mm?l cyUnder

stainless steels. ^1451^4. -Spfite heater ^ ^ 1 - ^*b flange7>

17.8MPa °}v\, Ai%] £ £ x r 370°Col2., shell ^ cover flange * M £ 4 4 A240-304

A182-F304^ ^ 4 ^ 1 ^ ^ ^ , 4^- ^ Radiogaphy test(RT)!- ^W ZL ^ ^ - i :

7}^-7)o)l^ heater, # 7)]^-, ^7) 7j]#, I 5 ^ s l 5 ) - ^^s|fe- 4 # flange7>

, 291*} Hfl^* f-^

- 4 -

2.

Sparger, 7fl##*l *]*]tfl, Sump Pump £ f ^ l ^ - g - Spray

Sparge^}

3m, ^

fe 47||S] View Port7>

Cover7l- -g

Sprayl-

^11: ^ « H Spray

2.3i

3. ^7} A)^

°] 741^^ 7><y-7lollA^ ^ 7 l # SDS ^ ^

^ Globe type Pressure Control Valve (PCV), Moisture Separator,

711 (Venturi), Isolation Valve, Vacuum breaker

°1 ^l^s] < l<i Heat Tracing^ Preheat Line^A^ ^ 7 l ^ S ^ € ^r S!i - , ?flf-

s l ^ £ # 1 ^ 5 . ^ ^ - 4 ^ - I ^ ^ $14. °1 Tilf- ZQ^ ^ ^ £ f e 4 4 16.0 MPa,

370 °C °l£f. ^ 7 l ^ # ^ ^ -4*

^^j-ol ^ ^ ^ ^ O | 014

xl-sf7] ^s>^ ^7l«o># Linei Vacuum Breakerl- ^^l«|-^4. °1 ^ ^ 2 ] 3 ] ^ ^ 2.5

inch ol^. 4 ^ ^ s ^ 63 mbar < 14. °1 Ui fe Non Return Valve ^ ^ ^ .

|f-o)4. 271)5] PCVfe

PCV

- 5 -

4. f > 7 ^ Tflf.

°1 7flf~& n^B^lf-, Water Storage Tank, Feed Pump, f ^ l l H M , Vortex

PCV,

^ # # *1e)*H oil- 7}^ ^ i W H , SE^: o| 1-4- 7KJ-71

fe 2|cH l.o MPa ^ SSI- ^711- <£^*}A3. 0.108 kg/s % •

in°^-^ 2.0 MPa °ltK

Water Storage Tank* ^ I ^^ - JL^ - ^ l ^ H Stl l

^ o l ^ Data# ,

Sensor ^ ^#7 lS-4^1^ ^ 1 ^ ^ ^]<H^:(control paneDAS.

DAS(Data Acquistion System)^-S ^ifl^lfe &£.3.*\ =?S

vfl lfe ^Is .^!^ ^1^1 ^ ^ 2:3h S ^ ^ ^ ^ l ^ H ^-S-tb Controller ^ ^ , Indicator

, Alarm ^ ^ ^ I s f - i : tipls}^3l, DASS. Hifl^lfe ^ISlfe- Multi-Connection Box

2711 Scanning A/D£^7] (HP E1413B)4 87fl2] Digitizer(HP E1429A) °d^

Indicator

^ £ ^ Digital

1. 1# -f

4-8-^1 fe Thermocouple (T/C)£ ^ ^ S . ^ 7 1 1 - 7]^ Multi-Connection

Box ^ Control BoxS ^1§ | -^I1 , T/C #-§-#^ 4-8-*>°^ ^l^f-^-S.^ ^ ^ 4 ^ 1 ^ ^

lfe Smarts 7)7}%

- 6 -

o](Steam LineWfe- ^W^l ^L(FE-201)# - i ^ l W . ¥O«V31(dynamic

pressure sensor)^ KISTLER43 fit 7061B1- ^-g-*^^-0! , ° 1 ^ Quench Tank ^

I7fl# ^^-«>^4. ^ ^ ^ t £ S ] Signal Conditioner^ 4-8-«>5l^, °1S. -B^

DSP JiHl- fl fV A/D converter!:

5} 42 ^ ° H , n ^- . 4^-4

• ££ : 31 Channels

• <&% : 7 Channels

• -fi-^ : 1 Channel

• ^ : 1 Channels

• >r-$\ • 2 Channels

zj- ^ 7 l s ^ s ] #^^l^fe 0~5Vdc Sfe 0

, T/C ^IJife ^ i l A c M » 7]% 0~40mV

2.

^ 4:21- ^ # ^ SJl^^- «]"^4. ^aLTfl^-(Alarm)^ ^ H ^ l ^ s ] ^ 7}

Interlock^

•

Heater^l ^ ^ ^ ^ ^ ] ^ ^ 5 ) 2 , ^7] Bypass Lineal

Alarm<>l 4 ^ = l £ ^ - «f^4. a ^ 7>«g-7l Heater^ ^7]-^ ^ ^7} Bypass Lineal

- 7 -

Close *b§-£ Hi-^1JL ^ * ] i L 4 10% ^ £ 1WH °W>] * ] £ ^ «>^A^ , Hi-Hi

Heater7>

3.

^ HP-VXI « # e W ^«fl HP-UX

^ ^ l f e Scanning A/D^^7] , W o r k s t a t i o n ^

HP-VEE 3.0 W/S-t 4-§

1307fl

. ^ DAS #«lfe VXI system^ 5

fe VXI bU3# f-

SICL(Standard

Instrument Control Library)°l] £\^ S/Wi ^ ^ s i n , ^^^1 datafe APM0]

(Instrument Language)?! SCPKStandard Com- mands for Programable

Instruments)^ ^1 ^ ^ ^ «11^5]^, HP VEE ^

±s. HP-VEE1- 4-§-#^ ,

Source ^

7]^#£- subroutines}-

function 3j-«H 4 ^ S n ^ H H ^g-frt ^ Sl£^- ^f£4. 4 ^ ^S- ^ ^ A ^ ^

£r HP V E E ^ Aj^l-C'START")^- ¥ # A ^ ^ s ] ^ , o]q HP VEEfe

4. # VEEfe C-?i^S ^ J € A%- source

- 8 -

<8-8r 4-§-«H Scanning A/D £ $ 7 l s | 2.7}S\- £ ^ - § r ^ H § U , S c a n n e r s . ^

subroutine^

Scanner^! Trigger

Scanner^

Venturi tube^l ^ • $-# 4 ° H 1 ^ -n-^1 ^^lslfe ^°^M Ik

7\\ 5131, ^ ^ ^ <&nxW -fi-f- ^ f l i tfl^ ^-^ ^ ^ 1 ; AVg- o ^ . ^ A - 7fl^§ ^

. Venturi tube^l ^^^ .^-& ISO 5167-1^ fl-^^ 4 ^ ^ - ^ ^ ^ ^ -fh^si -fr^ 1

Expansibility factor, £ ,fe P2 / PI = [(PT202) / (PT201)] > 0.75S1 3i?\

routined °d

g f dV24pP (kg/s)

= 0.0010881 £1 Ap

/? = 0.6884 ( 0 = diameter ratio = d/D )

x = 1.3 (Isentropic exponent, CPICV)

d = 0.0294 m

D = 0.0429 m

C = 0.995 (Discharge coefficient for machined case)

2.VT * 1 — Z?4 1 —.

XT \ i 1 p \/ _l

1.0081 rL53846 s , l - r 0 - 2 3 0 7 6 9 ^ m

0 .3 -0 .067359 rL53846 A 1 - r

— 9 —

r = P2 / PI = (PT202) / (PT201) [ r 2> 0.75 ]

AP = PI - P2 = (DP201) ( in Pa = kg/m sec2)

Pl = TI201, PT201S. 4 3 ^7}S. K£.n^)*\ ^ 1 ^ (kg/m3)

- 10 -

mTnSPARGERS

mTn6-SPARCERS

Fig. 2.1 Flow Diagram of the SDS (SafetyDepressurization System)

- 11 -

Pressure Vassal

•to

Manual Valve

TC2O2 PT20Z Control Vah/a 202

A— JVacuum Breaker

TC205

TC206

FT 601 .

Fig. 2.2 Schematic diagram of test facility and locations oftemperature and pressure sensors in the piping

- 12 -

H=1290

H =700

H =980

[Unit : mm]

Fig. 2.3 Sparger's Dimensions and Set-Up in the WaterPool Tank

- 13 -

96cm

Quench Tank Wall

(Dimensions in CM)

70cm

.. I

610(310cm)

609(270cm)

608(202cm)

607(152cm)

606(102cm)

Q

605(72cm)TC-604(52cm)

37.5

616(203cm)

614(146cm)

622(100cm)611 (98cm)623(95cm) .

620(46cm)

37.5

150

400

346

619(245cm)

617(192cm)

252

618(185cm)

612(98crn

Isi :

.11615(140cm)

170

613(93cm) _

) 621 (64cm)

37.5

84

Fig. 2.4 Thermocouples' Locations in the Water Pool Tank

- 14 -

10mm, 1447B^ ^sg ^ # ^ 4 25mm,

reduction ring)-!:

D ^7] ^ ^ 7 l ^ # 4 ^ ^ ^JS>fe ^ ^ 4 ^ ^ > # S ] £17]

D U-#^l BflSS 7>«a-7l 7 ^

ermal mixing)

3:71 ^

$I4.[5, 6] ZL^ 3.24 3.3i

tb 1 W ^7]^A}7l 47fll- 4-g-«H ^ ^ ^ - ^ r * ^ ^ ^ =L% 3.H^J7 ; £ 3-1 ofl ^ ^ o f l Af^-tt ^7l^Af7]S] 7l A>6j= ^ ^ ^ matrix

fe *HHM*>3.31 ^ ^ ^7l^-A}7l^f (Unit Cell t e s t ) i ^ ^

3.22} 3.3011 ji^-o] 7}o^7ls] «a-^^ ^ ^ 157bar?l ^^°llA1 2

«.s1 leakage ^fl^^-S globe type l^-°ll^fe

- 15 -

1-1:°llfe i-°l yov# (water clearing) £)JL

(air clearing)^*}. ^ S 4 ^ 1 ^ ^ S . 7>«a-7H-f 1 SsJ-f

1) #wov# (water clearing) - ^7l^-A}7l^ #$$.6]^ oici ^-o] ^-7}6\] o]sf)

2) ^7l*f- (air clearing) - f ^W s1*fl 7 } ^ € s^ifl ^7l7> §7l^}-7l l - f-sfl

3) ^7l«j-# (steam clearing) - ^H^ 7}^7}\1\ £.$-^7)7} nfl^-i- -fsfl H)-#s)

chugging^ ^ £ l

-^^; air clearing^

(dissipation)*}^

-g- l-sW &JL^(:ia 3_4a)) -71(ZL^ 3.4b) ?J ^

3.4d) S ^ 4 ^ ^ ^ o l ^ C i ^ 3.4c) r ^ t t ^r Si4. ^ ^^°H^1^ 2

^-1- 4-§-«f$3- fesj leakage^

- 16 -

^ ° 1 137bar, ^Sifl ^ z } - ^ £ £ 7 } 40 r , 4*}

7l (Sp4)l- 4-8-fl* 34- ^ 3 4 f-*fl <£<^ = r 3 ^ ^ S

3.5^1 SA]^ a}sf^-ci ^71 ^ f*l3] tij-tA] AA peak ^ ^ -

] ^ l7J)

-fe 1st peak4 ^7}s\ i%%X\ ^5*>fe 2nd peak^

^ ° M x r 2nd peak^l 1st

2nd peak±S- ^ 4 « H ^ ^ 3.6^

10mm

fe 5mm(Sp3; Sp4)3]

2. ^2i

^- €^°fl^ T 2 ^ I ^ S ] X}^ 4 ^ f e ^i^ 3.5i S^ltt 44£°1 2nd peak4 ^

1^ peak 4°1^ Al^t^ ^^ rd /^TLS ^ ^ § ^ 4 . o.& 3.7°1] ^^2] subcooUng°ll

^4^fe 5 ^

- 17 -

S. 32

- 18 -

Table 3.1 Test matrix and technical specifications of sparger

Quantity of Hole (EA)

Length (Hh, mm)

Pitch (P, mm)

Hole diameter (d, mm)

Size of sparger (mm)

Hole/Total flow area {%)

Steam mass flux (kg/m^-s)

Pool temperature (°C)

Spl

24

94.8

31.6

Sp2

24

237.0

47.4

10

2inch,

87

1,230 -

36 -

Sp3

96

260.7

23.7

Sch 40S

.1

- 2,380

- 95

Sp4

96

110.6

15.8

- 19 -

Table 3.2 Test Conditions and Results (1/4)

Initial Condition •' *Positive Picsburo at

tho Wall

Np '•K J=-E?OJ

ik'J o]

-IT2Q1 PT101

m'—.] [fci.1

PT205

[ B J ]

PT601 TC203

I ' - I

TC206 TC503 TC601

A

Poak

678

91011121314

2.8142.8243.8803.3802.869

1492.81498.12Q58.41793.1

9862,4.3.0562.7533.8654.1352.8132.9993.273

1522.01584.12175.11621-2146pT52Q50.4"2193.61492.31591.01736.3

110.73116.98149.95156! 46110.77

-0-02P.Q4

-0.05-0.09

0.290.310.240.22

116.98150,85157.14110.38150.28156.93110.49117.32130.30

0.09-0.15-0.14"P. 1.3

0.090.020.010.03

-0.040.02

Q.38O."i80.230.230.400,360.340.360.290.29

144.1338.

165.44185.99148.69

75.98

92.61

88.8461.52

146.5572.39

1281?167.2499.39

145.6068.02

197.46

83.28

79.2497.82

91.55

102.72

43.2642.6641.4041.2663.8763.9763.4162.7281.6881.9081.4090.5490.2793.34

46.8139.3049.2239.5363-9763.2764.8961.1682.3282.5980.1190.6889.58

102.17

27.611.829-122.9

13.911.432.636.743.662,233.726.621.026.6

18.08.2

14.221.1

" L017.420.330.862.524.151.1

26.2

25.019.226.321 721.717.924.416.117.520.012.011.910.28.1

No. of Sparger (K)

No.of Hole in a rowTotal no. of HolePitch / DiameterHole Dia.

1

624

3.1610

2| 3

424

4.7410

896

4.745

4

1296

3.165

Temp, of TC206

AEH

15~50°C50~90°C90-100°C

Table 3.2 Test Conditions and Results (2/4)

i

ro

123456789

10111?13141516171819202122232425262728293031

222222222222222222222222222222

i

• # -

®*&*i-

HEHEEAHEAEAHEAHEAEAHEAHEAEAAEA

Meix^goV'TRaltj

imp[KO^SI1

2.633.543.474.032.973.202.893.453.764.014.483.404.14

—2.763.393.772.823.103.354.014.312.823.433.722.823.112.973.393.54

[kn m'"-sl1 ...1395.21878.01840.82137.91575.61697.61533.21830.21994.72127.32376.71803.72196.3

-1464.21798.42000.01496.01644.61777.22127.32286.51496.01819.61973.51496.01649.91576.71796.31875.3

mm-[Bui]?;

91.45129.81131.96150.53111.31115.75111.84129.77135.73150.40157.49130.14150.59155.67110.43130.00136.85110.77117.37131.26151.02157.28110.94130.38137.28110.96116.93117.88130.81137.63

"•"1 D o r 1 m

1 f y| I.

- i ,

0.03-0.07-0.01-0.06-0.030.010.07

-0.05-0.01-0.05

0.010.060.01

-0.040.12

-0.03-0.10-0.01-0.060.04

-0.07-0.02-0.01-0.03-0.03

0-0.012

0.03-0.09-0.01

Initial Cond.t

--PTTfifjir

[Bar]%0.200.230.190.220.200.210.220.240.230.250.200.230.220.250.200.300.250.160.260.210.240.220.220.220.250.24

0.2480.2230.320.270.34

""[5C] *110.95129.59100.96156.80106.4797.8225.63

141.5998.2318.88

148.9253.09

154.81106.8423.60

192.8999.3920.03

148.5954.48

199.75113.7328.61

214.00115.3526.05

139.19735.19347.70

143.7058.81

ion -

£[°C]*84.94

101.3376.21

101.9880.0267.60

103.3776.85

79.38

103.2369.17

103.0475.93

WSMM81.17

102.1778.32

102.2180.16

76.621p26v608:

81.31ii87V53

-TCpqg.r°cr40.7541.4941.5938.2337.0660.0059.9160.9760.0559.7360.8860.5681.2680.3480.3982.4181.6381.3180.3980.0791.8791.2390.9692.4791.8391.46

92.88492.9385.1782.7882.41

T,C601,

r°ci42.3842.3343.7840.6137.8163.7451.7666.7860.6558.3062.8650.6583.8883.4774.6996.5281.8180.1184.6676.8196.2091.5186.0495.4692.1585.95

93.94191.96682.9683.4781.26

Positive Pressure atthe Wall

1 st Peak

[kPa]-

10.332.119.68.1

-33.512.3

4.641.3

9.731.0

8.411.8

21.4-

11.813.862.528.89.9

39.519.2

8.716.9

9.711.256.723.8

2nd Peak

[kPa]15.010.85.0

13.74.5

-4.89.06.8

-9.8

15.46.6

29.527.716.619.7

8.915.0

44.454.6

43.439.760.142.424.417.224.6

Freq

[Hz]26.528.824.328.624.323.0

-22.921.321.221.620.916.818.018.319.617.216.122.118.310.310.711.112.111.312.711.410.514.322.713.9

Table 3.2 Test Conditions and Results (3/4)

to

I

No

i

2.3456789

10111213141516171?192021112.3242526

K

3.064.324.01

3.43.733.67

2.8514.024.312.933.473.733.33

44.322.55

2.93.252.78

33.3

3.944.2473.3723.736

'1 'li -

IOUI.O

1623.32291.82127.31803.71978.81946.91512.52132.62286,51554.418_40.81978J?1766.62122I62291.81352.81538.51724.11474.~81591.51750.72090.22253.11788.91982.0

^. Inilial.p^ndi^or

110V

P1101

i iu.\c

117.08156.95150.14130.10137.26138.10110.22150.22155.95115.46131.43137,39130.86149.85157.43100.3511Q.141.1.7.73109.69116.96130.32150.04156.97129.79137.55

PT?Q5

0.030.010.03

0.020.060.010-00

-0-05_6.03

-0.080.00o.io

-0.070.01

-0.05-0.03-0.02-0.040.030.03

-0.020.05

-0.020.04

PTC01

0.1810.190-190.150.190.300.23

6.240.230.200.240.250.180.240.220.220.250.240.270.210.220.270.270.29

ICP03

155.94751.71228.05

113.2295.2716.8376.94

132.68.124.72

38.41217.33152.06

59.50228.30136.48

61.5716.9.15

94.8118.41

160.9358.16

244,25139,85

56.13141.87

48.99

TO?06

77.264

75.2079.42

74.4279.56

103.4690.59

1Q3.9779.01

101.0181.40

86.59

104.1182.50

83.05"38

41.21141.025

40.144Q.7042,1441.6360.4660.6561.5760,6982.0481.4980.9480,5379.7979.0181.9081.3580.9990.6390.3691.5190.8690.5490.3689.94

TC601

53.04832.25334.5942.9442.9837.2558.6759.8263=1.857.56

100,4581.5879,01

104.2581.1277.3681.8681.6878.3791.5188.98

104.1191.0988.6691.4687.79

Positive Pressure attho Wall

I Li I5- -il.

916.521.411.215.625.719.925.419,4

26.714.2

27.221.6

12.3

40.09.6

26.615.4

10.5

7.87.8

14.313.2

4,510.115.716.437.230.2

9.611.523.011.350.233.835.312.038.415.315.815.336.324.720.229.6

28"829.624.125.228.227.825.022.921.320.016.919.216.816.118.316.820.417.216.7

12.010.0

9.48.610.2

Table 3.2 Test Conditions and Results (4/4)

tow

No.

123456789

10111213141516171819202122232425

K

4444444444444444444444444

-

- "c

EAEAHEAEAHAEAAHAEAHEAHEEA

Max: Flow Rate

FE201

[kg/s]3

3.6163.9144.2072.4942.7453.0283.84

4.1383.2483.54

2.7593.0514.1053.26

3.4922.6933.0193.2063.807

43.2793.5322.6922.945

""FE201

[kg/rr^-s]1591.51918.32076.42231.81323.11456.21606.42037.12195.21723.11878.01463.71618.62177.71729.41852.51428.61601.61700.82019.62122.01739.51873.71428.11562.3

-.-

PT101'

[Bar].117.08136.38149.81156.40100.06110.24116.28150.04156.83129.73136.77109.71116.24156.42129.71136.96109.79116.81130.28150.20156.83129.61136.87109.83116.49

PT205

[Bar]0.030.02

-0.01-0.06-0.080.030.02

-0.020.070.06

-0.03-0.04-0.050.040.03

-0.040.01

-0.020.090.070.03

-0.020.010.05

-0.02

Initial Condition

PT601

[Bar]0.270.250.270.160.200.290.290.240.300.280.220.240.220.290.320.260.340.290.310.330.330.260.310.360.30

TC203

[°C]138.0750.70

148.0749.41

188.06149.9717.93

140.9361.52

170.8757.98

129.2626.4778.00

161.6972.53

138.9241.68

236.77142.4347.46

189.64102.72147.5554.02

TC206

[°C]83.01

5226/78483.79

101.1981.63

80.39::'.35*.io

101.56

75.52,.19.22

clZM,,ZA101.06

80.48

104.3989.53

TJlM.102.35

87.65•"33.51

TC503

[°C]42.1041.5941.7740.8942.1041.3140.6561.7561.2061.1660.5160.7460.1480.9480.9980.5380.8080.4892.7991.7491.5592.4391.6091.4190.17

TC601

Vc]44.5739.3043.7333.2842.5243.5437.4366.1859.0466.4153.9265.6757.6179.9387.1979.6183.5179.33

104.7190.5490.8297.5489.7192.9389.30

Positive Pressure atthe Wall

1st Peak

[kPa]15.7

9.824.218.510.320.110.626.718.0

-30.230.612.027.3

-22.531.812.2

-16.119.0

-18.438.116.5

2nd Peak

[kPa]15.611.424.415.211.616.211.622.112.910.128.312.411.020.6

-25.524.526.1

--

19.8-

18.362.513.5

Freq

[Hz]24.720.025.022.722.526.722.521.317.525.618.7

-19.812.3

-12.717.414.1

-7.36.710.66.98.110.4

Ito

tntnntti 111ttti

-T T T i i T T T T

"E" "E"

f"F" - "C"

is. i:>

"E" "E"

r "(D:

• .W/- -1 .+ . ' | . •+. .+. .4- '•{•• •+•

Fig. 3.1 Drawing of KNGR Sparger

• Valve open

10 15

Time [sec]

Fig. 3.2 Temperature trend in the piping during blowdownperiod

[Bar

]ur

eP

ress

160-,

140-

120-

80-

60-

40-

20-

0-

f~" ^~-~^____^^ . Valve close

Valve open \

; PT201 P T 1 0 1

f^S/ PT203

SP-03, T

W 7 PT204 \/PT205 \ ^ ^ ^

/ \ PTRO1 ^ ^ ^

•

MO| =60°C

— 1

2 4 6 8 10 12 14Time [sec]

Fig. 3.3 Pressure trend in the piping during blowdownperiod

- 25 -

(a) Initial water Clearing (b) Air Clearing

(c) Air/Stezim Clearing (d) Steam Discharging

Fig. 3.4 Image of water/air/steam discharging stages (Sp2, TP=84°C,

PpzR=117bar)

- 26 -

03

Q.

OJ

CD-•—»

CO

wCD

2nd Peak

2Q (steam clearing)

15-

10-

5-

0-

-5-

-10-

-15

1st Peak

(air clearing)

3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

Time [sec]

Fig. 3.5 Typical pressure signal induced from successive dischargingof water, air, and steam

- 27 -

a.CO

-5COo

CO

£a.

£

xCO

70

60-

50-

40-

30-

20-

10-

0

(a) Sp1

• PPZH=117bar

• PP2S=137bar

A PPZH=157bar

30 40 50 60 70 80 90 100

60.

50^

40-

30-

20-

10-

(V

(b) Sp2

• P r a

• PpzR

* PPZS

A •

*

=117bar

=137bar

=157bar

i • 1 ' 1 '

A

m

*

•A

30 40 50 60 70 80 90 100

70

60-

50-

40-

30-

20 ,

10-

0-

70-

60-

50-

40-

30-

20-

10-

0-

(c) Sp3

• PPZR=117bar

• Pp«=137bar

A PP2R=157bar

A •

*

mA

•

40 50 60 70 80 90 100

(d) Sp4

• P r a=H7bar

• Pp2R=137bar

A PP2R=157bar

-

•

* *•

40 50 60 70 80 90 100

Pool Temperature [°C]

Fig. 3.6 Trends of the maximum positiveamplitude with a variation of thesparger and the temperature of poolwater

- 28 -

N

30 -

25 -

CD 20

i 15[-CD

I 10OQ

- D. •

A

V

-

-

Sp1,

Sp2,

Sp3,

Sp4,

DV

1

d=10mm

d=10mm

d= 5mm,

d= 5mm,

.r

P/d=3

P/d=4

2

7

P/d=4.7

P/d=3. 2

A

A

AA

D

I . I . I

10 20 30 40

Subcooling [°C]

50 60

Fig. 3.7 Variation of the dominant frequencies with the P/d ratioof the sparger

- 29 -

36

^7]^-Af7ll- A}-§-^ Unit

Cell Test^ ^M <$.m^ ^7]^\7\$\ EL7]

tfl^- data base

(1)

(2)

(3) ^^Ml f . ^ ^ ^4^rfe 5 - 30Hz

(4) Unit Cel

[5],

- 30 -

INIS

KAERI/TR-1814/2001

(AR.TR

2001/4

31p. Stl^-(O), 8i-§-( ) Cm.

(sparger) containment

IRWST

air

BIBLIOGRAPHIC INFORMATION SHEET

Performing Org.

Report No.

Sponsoring Org.

Report No.Stamdard Report No. IMS Subject Code

KAERI/TR-1814/2001

Title / SubtitleExperimental study on the Air/Steam discharging load of safetydepressurization system (I)

Project Managerand Department(or Main Author)

Seok Cho (T/H safety research Team)

Heung Jun Chung, Young Jung Youn, Se Young Chun(T/H safety research Team)

Researcher andDepartment

PublicationPlace

Daejon Publisher KAERIPublication

Date2001/4

Page 31p. 111. & Tab. Yes(O), No ( ) SizeCm.

NoteClassified Open(O), Restricted( ),

Class DocumentReport Type Technical Report

Sponsoring Org. Contract No.

Abstract (15-20 Lines)

In the Korea Next Generation Reactor (KNGR) design, the Safety DepressurizationSystem (SDS) plays a great role in reducing the core damage frequency andimproving the severe accident performance of the KNGR. The actuation of POSRVsresults in a time-varying high-energy flow of air, steam, two-phase, and liquidfrom the pressurizer into the Incontainment Refueling Water Storage Tank(IRWST). The successive discharge of water, air, and steam induces thermalhydraulic phenomena such as a water jet, air clearing and steam condensation, andthese phenomena impose the relevant hydrodynamic forces on the IRWSTstructures. In the KNGR design, totally twelve 6inch I-type spargers will beinstalled in the IRWST. Therefore, an understanding of the related phenomena suchas the characteristics of dynamic pressure loads is a prerequisite for the design ofthe sparger and IRWST structure to withstand the pressure loads. In the presentstudy, four 2inch I-type spargers test were performed to characterize the pressureloads at the quench tank wall.

Subject Keywords(About 10 words)

Safety Depressurization System, Sparger, Air clearing,characterize the pressure loads