mark i containment program,monticello t-quencher thermal ...nedo-24542 79ned1 01 class i august...

NEDO-24542 79NED1 01

CLASS I AUGUST 1979

,ft 4*

i~I~V, ~i.~ m% A

MARK I CONTAINMENT PROGRAM

MONTICELLO T-QUENCHER THERMALI O

H NOTICE

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RECORDS FACILITY BRANCH

MIXING TEST FINAL REPORT TASK NUMBER 7.5.2

B. J. PATTERSON

7910170 ?

GENERAL * ELECTRIC

NEDO-24542 79NED101 Class I

August 1979

EU TO REACTORIOCE FILES ,

MARK I CONTAINMENT PROGRAM

MONTICELLO T-QUENCHER THERMAL MIXING TEST

FINAL REPORT

Task Number 7.5.2

B. J. Patterson

Reviewedl

M. E. Tanner, Manager Safety/Relief Valve Programs

P. P. Stancavage, Manager Containment SRV Performance Engineering

Approved: _

P. W. Ianni, Manager Containment Design

- P. W. Marriott, Manager Containment Engineering

NUCLEAR ENGINEERING DIVISION * GENERAL ELECTRIC COMPANY SAN JOSE, CALIFORNIA 95125

GENERAL* ELECTRIC

Vrw- r'I 1{qvLc-1qy

NEDO-24542

DISCLAIMER OF RESPONSIBILITY

Neither the General Electric Company nor any of the contributors

to this document makes any warranty or representation (express

or implied) with respect to the accuracy, completeness, or

usefulness of the information contained in this document or that

the use of such information may not infringe privately owned

rights; nor do they assume any responsibility for liability or

damage of any kind which may result from the use of any of the

information contained in this document.

NEDO-24542

TABLE OF CONTENTS

Page

ABSTRACT ix

1. INTRODUCTION 1-1

1.1 Background 1-1

1.2 Test Objective 1-2

2. SUMMARY OF PRINCIPAL OBSERVATIONS 2-1

3. TEST PROCEDURE 3-1

4. INSTRUMENTATION 4-1

5. DISCUSSION OF RESULTS 5-1

5.1 Description of Phenomena 5-1

5.2 Instrumentation and Test Data Summary 5-1

5.3 Results 5-2

6. REFERENCES 6-1

APPENDICES

A. POOL TEMPERATURE TRANSIENTS A-1

B. POOL TEMPERATURE TRANSIENTS WITH RHR POOL COOLING B-1

C. SRV STEAM FLOW RATE C-1

iii/iv

NEDO-24542

LIST OF ILLUSTRATIONS

Figure Title Page

1-1 Monticello T-Quencher 1-3

1-2 T-Quencher Hole Pattern (Arm 1) 1-4

1-3 T-Quencher Hole Pattern (Arm 2) 1-5

1-4 Quencher Installation 1-6

1-5 Monticello Plant Configuration. 1-7

1-6 Locations of RHR Suction and Discharge Piping in Monticello Torus 1-8

4-1 Pool Water Temperature Sensor Locations in Torus 4-4

4-2 Pool Water Temperature Sensor Location - Bay C 4-5

4-3 Pool Water Temperature Sensor Location - Bay B 4-6

4-4 Pool Water Temperature Sensor Location - Bay H 4-7

4-5 Pool Water Temperature Sensor Location - Bay E/F 4-8

4-6 Pool Water Temperature Sensor Location - Bay D/E 4-9

4-7 Pool Water Temperature Sensor Location - Bay D 4-10

4-8 Pool Water Temperature Sensor Location - Bay D 4-11

4-9 Pool Water Temperature Sensor Location - Bay G/H 4-12

4-10 Block Diagram of DS-83 Scanner System 4-13

5-1 Measured Versus Calculated Bulk Pool Temperature Test Without RHR 5-5

5-2 Measured Versus Calculated Bulk Pool Temperature Test With RHR 5-6

5-3 Maximum Temperature of Water Feeding the T-Quencher Test Without RHR 5-7

5-4 Maximum Temperature of Water Feeding the T-Quencher Test With RHR 5-8

5-5 Average Bay D Temperatures, Test Without RHR 5-9

5-6 Average Bay D Temperatures, Test With RHR 5-10

5-7 Bay Average Temperature, Test Without RHR 5-11

5-8 Bay Average Temperature, Test With RHR 5-12

5-9 Bay Average Temperature, Test Without RHR 5-13

5-10 Bay Average Temperature 5-14

A-1 Bay C Temperatures, Test 1 A-1

A-2 Bay B Temperatures, Test 1 A-2

A-3 Bay H Temperatures, Test 1 A-3

NEDO-24542

LIST OF ILLUSTRATIONS (Continued)

Figure Title Page

A-4 Bay E/F Temperatures, Test 1 A-4

A-5 Bay D/E Temperatures, Test 1 A-5

A-6 Bay D Temperatures, Test 1 A-6


A-8 Plant Sensor Temperatures, Test 1 A-8

A-9 Bay C Temperatures, Test 2 A-9

A-10 Bay B Temperatures, Test 2 A-10

A-11 Bay H Temperatures, Test 2 A-11

A-12 Bay E/F Temperatures, Test 2 A-12

A-13 Bay D/E Temperatures, Test 2 A-13



A-16 Plant Sensor Temperatures, Test 2 A-16

B-1 Bay C Temperatures, RHR Cooling B-1

B-2 Bay B Temperatures, RHR Cooling B-2

B-3 Bay H Temperatures, RHR Cooling B-3

B-4 Bay E/F Temperatures, RHR Cooling B-4

B-5 Bay D/E Temperatures, RHR Cooling B-5

B-6 Bay D Temperatures, RHR Cooling B-6

B-7 Bay D Temperatures, RHR Cooling B-7

vi

NEDO-24542

LIST OF TABLES

Table Title Page

3-1 Test Initial Conditions 3-3 3-2 Test Limiting Conditions 3-3 4-1 Sensor Specifications 4-2 4-2 Recording System Specifications 4-3

vii/viii

NEDO-24542

ABSTRACT

This document presents the results of the Monticello T-Quencher

Thermal Mixing Test that was performed in November 1978. The

objective of the test was to evaluate the effectiveness of a modi

fied T-quencher design (holes in one endcap) and a modified

residual heat removal (RHR) return system (90-degree elbow and

10-inch by 8-inch reducing nozzle at the end of discharge line) on

thermal mixing of the water in the pressure suppression pool

during safety/relief valve (SRV) discharge. Results of the test

show that the modified RHR discharge system yLelds a marked

improvement in thermal mixing over the modified T-quencher design.

ix/x

NEDO-24542

1. INTRODUCTION

1.1 BACKGROUND

An in-plant testing program was conducted at the Monticello Nuclear Generating Station of Northern States Power in December 1977 to evaluate the loads and pool thermal mixing characteristics resulting from a safety/relief valve (SRV) discharge through a T-quencher device. An additional test (extended SRV discharge) was conducted at Monticello in February 1978 to gather more data on the thermal mixing phenomena observed in the pressure suppression pool when one loop of the residual heat removal (RHR) system was operating in the recirculation mode. Test results1 showed the difference between the average discharge bay temperature and the calculated bulk pool temperature to be 430F for the test without RHR and 380F for the test with RHR. These two tests will be referred to as the "previous tests". In order to investigate other methods to enhance thermal mixing in the pool, modifications were made to the T-quencher design previously tested and also to the RHR return lines in the pool. This report describes the tests that were performed in November 1978 to evaluate the effectiveness of these modifications.

The original T-quencher device consisted of two arms (each approximately 9-1/2 feet long) perforated with holes on the front and back sides of the arms. The arms were attached to the ends of a ramshead-type device similar to those previously installed in the Monticello plant on the end of the safety/relief valve discharge line (SRVDL).

The modified T-quencher device (shown in Figures 1-1, 1-2 and 1-3) is similar to the previously tested T-quencher except that 40 holes in one arm of the device were relocated from the arm of the T-quencher to the face of the endcap. The purpose of the steam discharge through the endcap was to induce pool water circulation in the direction of discharge and hence to increase thermal mixing in the pool, as indicated by a decreasing bulk pool to average bay temperature differential. The quencher was supported at the ramshead fitting and at the midspan of the quencher arms as shown in Figure 1-4. These supports were connected to a 14-in. pipe support, which in turn was attached to the torus ring girders. Figure 1-5 illustrates the Monticello plant configuration.

1-1

NEDO-24542

The original RHR system consisted of four 20-in. suction lines (located at

45-degree, 135-degree, 225-degree and 315-degree azimuth) and two vertically

oriented 10-in. discharge lines at 74-degrees and 299-degrees azimuth. The

RHR system was modified by installation of a 90-degree elbow with a 10-in. by

8-in. reducing nozzle at the end of the existing discharge lines. These

revised discharges were oriented tangentially to impart circumferential flow to

the suppression pool. Figure 1-6 illustrates the RHR suction and modified

discharge piping in the Monticello torus.

1.2 TEST OBJECTIVE

The objective of the Monticello T-Quencher Thermal Mixing Test was to evaluate

the thermal mixing characteristics of a modified T-quencher device and a modi

fied RHR discharge line by providing pool thermal mixing data of pool tem

perature under extended discharge of the T-quencher.

1-2

10-inch SCHEDULE 80 PIPE - SRV DISCHARGE LINE

NUMBER OF HOLES

ARM 1 ARM 2

90 90

QUENCHER ARM 2 (SEE FIGURE 1-3)

12-inch SCH 80 /

B 112 112

C 176 176 0

D 416 376 . -- ---- -- -10 X 12 SCH 80 L

E 0 40 REDUCER

1588 TOTAL NUMBER OF HOLES/QUENCHER

QUENCHER ARM 1 HOLE PATTERN ON BOTH (SEE FIGURE 1-2) N: 'SIDES OF QUENCHER ARM

ZONE A

EZONE B

ZONE C

HOLES SYMMETRICAL ABOUT HORIZONTAL C ZONE D

Figure 1-1. Monticello T-Quencher

ZONE

A

ZONE E

-Ic

tVj

U1

Figure 1-3. T-Quencher Hole Pattern (Arm 2)

*Proprietary information deleted

NEDO-24542

MID-ARM SUPPORT

10-in. DISCHARGE PIPE

RAMSHEAD SUPPORT

12-in.QUENCHER

TORUS SHELL MITERED JOINT RING GIRDER

Figure 1-4. Quencher Installation

1-6

SRV DISCHARGE LINE

C TORUS

ELEVATION 912 ft - 7-1/2 in.

Figure 1-5. Monticello Plant Configuration

t')

NEDO-24542

DISCHARGE FOR LOOP

CONTAINING PUMPS 12, 14

0

10 in. RHR DISCHARGE

STRAINER

20 in. SUCTION LINE

Figure 1-6. Locations of RHR Suction and Discharge Piping in Monticello Torus

1-8

VIEW A- A

NEDO-24542

2. SUMMARY OF PRINCIPAL OBSERVATIONS

Two extended SRV discharge tests were run - one to evaluate the thermal mixing characteristics of a T-quencher with holes drilled in one endcap and the other to evaluate this same T-quencher with RHR operating in the recirculation mode. Both upstream and downstream sides of the test bay were analyzed. The following phenomena were observed.

a. Holes drilled into one endcap of a T-quencher did induce some pool circulation to enhance thermal mixing.

b. RHR operation showed a marked improvement in thermal mixing.

2-1/2-2

NEDO-24542

3. TEST PROCEDURE

The overall procedure for the two extended actuations of a single SRV was to

first cool the pool to -500F with both RHR systems operating in the pool

cooling mode. The RHR system was then shut off for more than eight hours to

allow the pool to stop circulating before the SRV was opened. The SRV was

opened for 11 minutes, 7 seconds and discharged steam into an initially still

pool. Temperature data were recorded for one hour after the SRV was opened.

Both RHR systems were again operated in the pool cooling mode to bring the

pool temperature down to .50aF. One and a half hours before the second test,

the RHR system operation was switched to one RHR system discharging 1800

around the torus from the test bay and operating in the recirculation mode.

The SRV was opened for 12 minutes, 15 seconds and discharged steam into the

pool, which was already circulating at steady state conditions with the one

RHR system continuing to operate. Temperature data were recorded for

45 minutes after the SRV was opened.

The more specific procedure to collect temperature data was as follows:

After verifying that all initial conditions requirements were satisfied

(Table 3-1) and proper communication existed between the control room and the

recording station in the reactor building, steady state data were collected.

The actual test started with a 15-second countdown. All recording equipment

was started before the count of ten and the SRV was actuated at time zero.

The SRV was closed at the time the bulk pool temperature was calculated to

reach 950 F based on SRV flowrate. Temperature data were recorded for at

least 30 minutes after the valve closed.

Operational limits were included in the test to ensure that safe operation of

the plant was not impaired. These limits are provided in Table 3-2. The time

to heat the pool to a bulk pool temperature of 950F was determined to be the

most limiting test condition.

3-1

NEDO-24542

During the test the following additional information was recorded:

a. Feedwater flow rate

b. Reactor vessel water level

c. Reactor vessel pressure

d. Turbine steam flow rate

e. Average Power Range Monitor (APRM) readings

f. Times the SRV was opened and closed

g. Torus pool water temperatures.

3-2

NEDO-24542

Table 3-1

TEST INITIAL CONDITIONS

Allowable

Initial reactor power level

Initial core flow

Initial reactor water level

Initial reactor pressure

Torus water volume

Torus water temperature

Drywell-wetwell AP

65% to 85%

90% to 100%

29 ±1 in.

985 ±5 psig

68,000 to 70,000 ft3

50 to 550F

0 psid

Actual Test 1 Test 2 (No RHR) (With RHR)

82.6 83.1

100% 100%

29.0 29.0

981.5 982.5

69000 69000

52.1 53.2

0 0

Table 3-2

TEST LIMITING CONDITIONS

Drywell pressure, maximum

Margins from scram:

Neutron flux, minimum

Reactor vessel water level, minimum

Reactor vessel pressure, minimum

Pool water volume, maximum

Average bay D temperature, maximum (T16, T17, T18, T19)

Bulk pool temperature, maximum

Allowable

16 psia

11%

6 in.

15 psi

76,000 ft3

140OF

950F

Actual

Test 1 Test 2 (No RHR) (With RHR)

15.5 15.2

20%

12.5-14.5

64

71,000

121

89

21%

13-14

63

72,000

97

93

3-3/3-4

NEDO-24542

4. INSTRUMENTATION

Twenty-three resistance temperature detectors (RTDs) were installed in the suppression pool. The sensors were Rosemount Series 78 Platinum RTDs with a

measurable temperature range of 50aF to 200aF and an accuracy of ±20F.

Detailed RTD specifications are given in Table 4-1. Locations of these

sensors around the torus are shown in Figures 4-1 through 4-8.

Temperatures were recorded by a Validyne DS-83 digital recorder. Detailed

DS-83 specifications are given in Table 4-2. A block diagram of the DS-83

scanner system is shown in Figure 4-10. The DS-83 temperature signals were

calibrated by a decade resistor.

Temperature data were printed on paper tape in real time, with an interval of

one minute beween successive readings of the same channel. There are 40 chan

nels available on the DS-83; channels 1 to 23 were connected to sensors Tl

T23 and channels 24 to 40 were connected to sensors Tl-T17. Temperature

data on these 17 sensors were actually recorded twice a minute, 23 seconds

apart. (Tl recorded at 1 and 24 seconds, T2 recorded at 2 and 25 seconds;

etc.)

The two plant pool temperature monitoring sensors were recorded by the plant

temperature recorder. Locations of these sensors are shown in Figure 4-9.

Other plant data were monitored on the plant process computer or other plant

recorders.

4-1

NEDO-24542

Table 4-1

SENSOR SPECIFICATIONS

Type of sensor: resistance temperature detector

Location: wetwell - pool

Sensor designation(s): Ti through T23

Variable to be measured: temperature (of pool)

Range of variables Maximum Value Minimum Value

Typical 150 500F

Maximum 212 500 F

Highest frequency component (Hz): 1

Lowest frequency component (Hz): 0

Maximum environment (including before, during, after tests)

Fluid: Water, steam

Temperature (oF): 200

Pressure (psia): 30

Other: water maximum flow rate at 75 ft/sec over sensor. Steam impingement

on sensor.

Sensor manufacturer, model: Rosemont 78 series (Platinum) RTDs

Range/accuracy: 50OF to +200aF/±2 0F steady-state.

4-2

NEDO-24542

Table 4-2

RECORDING SYSTEM SPECIFICATIONS

Digital recorder:

Input:

Scan rate:

Signal conditioning:

Output:

Format:

Linearity:

Validyne DS-83 (for pool temperature)

±10 volts for 10,000 counts

Intervals of 1, 2, 4, 10, or 20 minutes (or 1, 2, 4, 10 or 24 hrs). Automatic 40-channel mechanical scanner

PT-174

Newport Laboratories, Model 2000 DPM and 200B DPM

21 columns for 11 headings

Less than ±0.1% using standard RTD curves

4-3

NEDO-24542

SOUTH

0

90

A PLANT POOL TEMPERATURE THERMOCOUPLES (EXISTING)

Figure 4-1. Pool Water Temperature Sensor Locations in Torus

4-4

270'

NEDO-24542

T1, T2, T3

BAY C/D

SECTION A-A

VENT HEADER vSUPPORT

TORUS SHELL

A -+ A

1616 in.

() T1

T2 131.4 in.

Iin.

80.0 in.

38.0 in. T

Figure 4-2. Pool Water Temperature Sensor Location - Bay C

4-5

NEDO-24542

T4, T5, T6

Figure 4-3. Pool Water Temperature Sensor Location - Bay B

4-6

NEDO-24542

in.

Figure 4-4. Pool Water Temperature Sensor Location - Bay H

4-7

T7, T8, T9

-TORUS SHELL

A

NEDO-24542

T10, T11, T12

TORUS SHELL

Figure 4-5. Pool Water Temperature Sensor Location - Bay E/F

4-8

NEDO-24542

T13, T14, T15

BAY E

SECTION A-A

VENT HEADER SUPPORT

TORUS SHELL

A -- A

166 in.

O1 T13

131.4 in.

80.0 in. I1 T15

38.0 in.

Figure 4-6. Pool Water Temperature Sensor Location - Bay D/E

4-9

NEDO-24542

- T-QUENCHER ARM SUPPORT

- BAY D - ( DISCHARGE

VENT HEADER

- RING GIRDER

- DOWNCOMER

DOWNCOMER BRACE

T-QUENCHERPIPING

Figure 4-7. Pool Water Temperature Sensor Location - Bay D

4-10

q_

U'

Figure 4-8. Pool Water Temperature Sensor Location - Bay D

NEDO-24542

VIEW E-E

G 2250 AZIMUTH

E

Figure 4-9. Pool Water Plant-Temperature-Sensor Location-Bay G/H

4-12

SW PLANT SENSOR

SW PLAN

E

O ti2

0

'-

Figure 4-10. Block Diagram of DS-83 Scanner System

NEDO-24542

5. DISCUSSION OF RESULTS

5.1 DESCRIPTION OF PHENOMENA

When the SRV is opened, steam flows through the T-quencher into the suppres

sion pool. The heat and momentum imparted to the pool water from the inflow

ing steam result in circulation of the pool water and create thermal currents.

If there is no bulk circulation of the pool water around the torus, water

circulation and the creation of thermal currents will be essentially contained

within the discharge bay. If there is bulk circumferential circulation of

the pool water at a low velocity, the circulation and thermal current

patterns are skewed in the direction of flow. If there is bulk circumferen

tial circulation of the pool water at a high velocity, the turbulent mixing

will break up circulation and thermal current patterns.

5.2 INSTRUMENTATION AND TEST DATA SUMMARY

Twenty-three temperature sensors (Tl through T23) were installed at selected

locations in the pool to measure the pool heatup transient. The location of

these sensors is presented in Section 4. In addition, data from the two plant

pool temperature monitoring sensors were recorded by the plant process

computer. The temperature data for sensors Tl-T23 were recorded at one-minute

intervals by a data acquisition system whose output was in a paper tape format.

All of the sensors were operational for the two tests. Time plots of tempera

tures for each sensor are provided in Appendix A.

Sensors Tl through T23 were distributed within bay D and throughout the pool

to measure: (1) temperature of the water supply feeding the T-quencher,

(2) average bay D temperature, (3) bulk pool temperature, and (4) temperatures

in locations comparable to those of the previous tests.

5-1

NEDO-24542

The sensors were located around the torus in approximately every other bay, and were located within a bay at approximately the volumetric center of

equal volume regions.

5.3 RESULTS

5.3.1 Bulk Pool Temperature

The bulk pool temperature was measured by 15 sensors (Tl through T15) distributed

throughout the pool. These sensors were located to give an accurate measure

ment of the bulk pool temperature; i.e., within 30F of the calculated values.

The measured bulk pool temperature (average of the 15 sensors) is compared

to the calculated bulk pool temperature as a function of time in Figures 5-1

and 5-2. The long-term bulk pool temperature (average of the 15 sensors) was

used as one of the ways to determine the SRV steam flow rate (Appendix C).

Since the SRV steam flow rate was calculated to be essentially the same with

two other methods, there is good confidence in the measurement of the bulk

pool temperature.

5.3.2 Test Bay Temperature

Two temperatures are of interest within bay D itself: the temperature of

the water feeding the T-quencher and the average bay temperature. The

upstream and downstream sides of the bay are analyzed separately. The tem

perature of the water feeding the T-quencher is the temperature measured

above and below the T-quencher arm; i.e., T18, T19 and T20, T21.

Figures 5-3 and 5-4 present the maximum temperatures of the water feeding

the T-quencher with the calculated bulk pool temperature for both tests.

In general, while the SRV is open, the maximum temperature occurs below the

arm. After the SRV is closed, the maximum temperature is above the arm.

The average upstream and downstream bay D temperatures are the average of

the four sensors on each side of the bay. The two sides of the bay are pre

sented separately. Figures 5-5 and 5-6 present the average bay D tempera

tures and the calculated bulk pool temperature for both tests.

5-2

NEDO-24542.

5.3.3 Torus Temperature Distribution

The average temperatures for bays other than bay D are shown in Figures 5-7

and 5-8. The total torus temperature distribution is given in Figures 5-9

and 5-10 for specific times. In the first test (no RHR), the bays on either

side of the T-quencher (bays C, D/E) heated up at approximately the same rate

for the first few minutes. Then the pool circulation induced by the holes in

the endcap slowed the rate of temperature rise upstream of the T-quencher. If

there were no pool circulation, the bays farther away on either side of the

T-quencher (bays B and E/F) should show approximately the same temperature

due to convective currents. In these more distant bays, the pool circulation

was sufficient to override the convection and to heat up bay B and bay H

faster than bay E/F. This indicates that steam discharging from the endcap

holes did induce some circulation.

In the second test (with RHR) , the pool water was moving at sufficient velocity

such that the temperature spread in both directions was not so apparent,

although there appeared to be some spreading, since the top sensor in bay D/E

upstream of the T-quencher heated up in the first two minutes. The tempera

tures of bays B and C downstream.of the T-quencher were much the same

bay C reaching a given temperature approximately one minute earlier than bay B.

The temperatures of bays D/E and E/F upstream of the T-quencher were also much

the same, although oscillating around each other. The temperature of bay H

at the opposite side of the torus was somewhere between the temperatures

of other bays. All bays heated up at approximately the same rate. After the

SRV was closed, all the temperatures blended to within a total range of five

degrees in six minutes. This shows the RHR modifications did induce consider

able pool mixing. Temperature oscillations appeared in the temperature

transients of the second test (with RHR) (e.g., Figure A-9) and also to a

small degree in some of the centrally elevated sensors of the first test

(no RHR) (e.g., Figure A-2). These waves show the effects of an uneven tem

perature distribution around the torus, as shown in Figures 5-9 and 5-10.

5-3

NEDO-24542

5.3.4 RHR Pool Cooling

Following the first test, both RHR systems were operated in the pool cooling

mode to bring the pool temperature down to %500F. Temperatures were recorded

during this time to see how quickly RHR system operation could reduce the

stratification of an initially still pool. Time plots of temperatures for

each sensor are provided in Appendix B.

5-4

1 1 1 1 11111f l i i 1 1 1 1 11 'I I

I iii 111 I 1 1i

] & AVERAGE OF T1-T15

40 2 4 6 8 1 1 1 1 1 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

TIME (min)

Figure 5-1. Measured Versus Calculated Bulk Pool Temperature - Test Without RHR

120

110

100

90U

1

w

CL

U-' -M

0

.I Ila

vzn . . , . i i . .. . I I . . I 1 1 . 1 . 1- 1 1 1 1 . 1 - 1 - 1 .

1 1 1 1 1 1 1 1 1

DU

t

I

I I l l I I I I

& AVERAGE OF T1-T15 11

1111111 111111111 I

' I 'I I I I II i i Ii ' " I 'I I

40 2 4 6 L LL1L1. 1 1 2 1 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

TIME (min)

Figure 5-2. Measured Versus Calculated Bulk Pool Temperature - Test With RHR

120

110

100

U 0r D

iwU a.

w Ui

I l I lII1

90

80

70

II

-S

tri

t-n

7

rn

I I - 7 7 - -

I Afli i

I Xr!

I i V I

A DOWNSTREAM ARM (MAXIMUM OF T20-T21)

* UPSTREAM ARM (MAXIMUM OF T18-T19)

T19 T20

140

130

120

110

100

90

45

.K POOL

NI) 4-1

i i i i i i i I 1 11

SRV CLOSES

ERhI

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

TIME (min)

Figure 5-3. Maximum Temperature of Water Feeding the T-Quencher - Test Without RHR

L

Iwn CL

T18 tl 1 1 1

80

70

60

50

40

aT21 I

I .i i . I

-

I i

r - i ! i f i1 4 4 4 I. I I I I I I . . I . .

y

I Iii I BULK POOL TI I I I I I

DOWNSTREAM ARM , (MAX IMUM OF T20-T21)

* UPSTREAM ARM (MAXIMUM OF T18-T19)

T19 T20

T18 T21I I II IPERAT

II !I I II II I I II I I IF I I

1i I lil SRV CLOSES

I I I I I I I I I I I I I 1I I

6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

TIME (min)

Figure 5-4. Maximum Temperature of Water Feeding the T-Quencher - Test With RHR

130

120

I I I I

4 -- ~--

-H

7'KTh'~

I I I I I I I±Hzb--V&~iF4110

100

90

80

2(

4-4

Z0

w a.

w I-

70

60

50

40E 0 2 4

0

f"3

I I ' 11

,

,

: I . II I I

-

I1I1 I 1 1 1 1 1 1 1 1 11L L

! I I II

- 4 I I

0 0

L/1 .p 11.

TIME (min)

Average Bay D Temperatures, Test Without RHR

140

130

120

110

U.

9L 100 w

90 w

w

Figure 5-5.

140

-4 130

120

t 4 4-

110

In

CL

80 I F 10 .4

I-

SRV C LOSES 90 4

50

40 I 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28

TIME (min)

Figure 5-6. Average Bay D Temperatures, Test With RHR

734 36I I 3 4

30 -3 IC 34 36 358 40w

* BAY C (AVERAGE OF T1-T3)

O BAY B (AVERAGE OF T4-T6)

O BAY H (AVERAGE OF T7-T9)

A BAY E/F (AVERAGE OF T10-T12)

X BAY D/E (AVERAGE OF T13-T15)

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

SRV CLOSED

18 20

TIME (min)

22 24 26 28 30 32 34 36 38

Figure 5-7. Bay Average Temperature, Test Without RHR

130

120

110

LL 0

F

I.-

100

90

80

70

60

50

40

t~j 0

Ln

0 I I . ..1 . 6 L 1 1..2. 1 4 16J 0 2 4 6 8 10 12 14 16 40

... ... I... - I4.T

130

120

110

100

90

80

70

60 LSRV CLOSED 600

50

40 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

TIME (min)

Figure 5-8. Bay Average Temperature, Test With RHR

U

0U

wj

z txj

0

G/H GI I I

F/G_ F E/F E-- P . 14 wI ON P 1

I I I

b-V

El PLANT SENSOR (11 MIN)

A AVERAGE OF SENSORS IN BAY

11111

BAY DESIGNATIONS D/E D C/D C B/C B A/B A

D.Im ' 1 4T I IIII

H

I

140

130

120

110

100

90

L7 min

C

Lni

. . . . .,,. n I ,

3 mi

111111

5 sec1

.L140 120 100 80 60 40 20 0 20 40 60 80 100 120 140 160

DISTANCE FROM BAY D CENTERLINE (ft)

Bay Average Temperature, Test Without RHR

1

11 0 w

I-

80

70

60

50

40160

' I

i i H+i i UPSTREAM t+ -

149.2 1 1 1 " -aTTI zj:l

I I IH/A

I-T-T--H :F ---. 4

Figure 5-9.

BAY DESIGNATIONS

H

-

160 140 120 100 80 60 40 20 0 20 40 60 80 100 120 140 160

DISTANCE FROM BAY D CENTERLINE (ft)

Figure 5-10. Bay Average Temperature, Test With RHR

120

110

t-n U

I-

NEDO-24542

6. REFERENCES

1. "Mark I Containment Program Final Report:

Task Number 5.1.2," NEDO-21864, June 1979.

Monticello T-Quencher Test.

6-1/6-2

NEDO-24542

APPENDIX A

POOL TEMPERATURE TRANSIENTS

130

120

110

2 100

I- 90

LU l Uln

m 80

70

60

50

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

TIME (min)

Figure A-1. Bay C Temperatures, Test Without RHR

*Proorietary information deleted

*

130

120

110

C 100

90

7 0 loo3 UU'

60

50

40 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

.TIME (min)

Figure A-2. Bay B Temperatures, Test Without RHIR


130

120

110

U. 100

w

o4 90 cc

80

70

60

50

400 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

TIME (min)

Figure A-3. Bay H Temperatures, Test Without RHR


*

z

0-nl

130

120

110

E 100

LU oo

I- 90

tL

m 80

70

60

50

40 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

TIME (min)

Figure A-4. Bay E/F Temperatures, Test Without RHR


*

z~

C,

130

120

110

2100 o

70

60

50

400 2 4 6 8 10 12 14 16 18 20 22 24 26

TIME (min)

Figure A-5. Bay D/E Temperatures, Test Without RHR


28 30 32 34 36 38 40

*

zT

t'3

130 1

120

110

2 100

oo

09

1-80

70

60

50

40 0 2 4 6 8 10 12 14 16 18 20 22 24 26

TIME (min)

28 30 32 34 36 38 40

Figure A-6. Bay D Temperatures, Test Without RHR


*

0

140

130

120

110

Uo 100 L

w s80

70

60

50

40 0 2 4 6 8 10 12 14 16 18 20 22

TIME (min)

24 26 28 30 32 34 36 38 40

Figure A-7. Bay D Temperatures, Test Without RHR


I*d

130

120

110

100 0

90

w CL

w I- 80

70

60

50

40

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

TIME (min)

Figure A-8. Plant Sensor Temperatures, Test Without RHR


*

0

Li' -

0 2 4 6 8 10 12 14 16 18 20

TIME (min)

22 24 26 28 30 32 34 36 38 40

Figure A-9. Bay C Temperatures, Test With RHR


130

120

110

oo a 100

70

60

50

40

*

U.

130

120

110

100

LL 0

.1L 70

60

50

40 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

TIME (min)

Figure A-10. Bay B Temperatures, Test With RHR


*

z

4-1

130

120

110

100

U0

80

LU C2 80 LU

70

60

50

4030 32 34 36 38 40

Figure A-11. Bay H Temperatures, Test With RHR


0 2 4 6 8 10 12 14 16 18 20 22 24 26 28

TIME (min)

*

'-

4 6 8 10 12 14 16 18 20 22 24 26 28 30

TIME (min)

32 34 36 38 40

Figure A-12. Bay E/F Temperatures, Test With RHR


130

120

110

100

LU

90

90 I-.

w 02 80; LU

70

60

50

40

tz

IL3

0

130

120

110

- 100 L

w

90

w

mi 80 IL

70

60

50

40 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

TIME (min)

Figure A-13. Bay D/E Temperatures, Test With RHR


*

0 2 4 6 8 10 12 14 16 18 20 22

TIME (min)

24 26 28 30 32 34 36 38 40

Figure A-14. Bay D Temperatures, Test With RHR


130

120

110

LL

. 100 Lii

(C 90 Lii

2 .

80

70

60

50

40

*

z

0 C-l

-

130

120

110

IL 100

80

70

60

50

40 0 2 4 6 8 10 12 14 16 18 20 22

TIME (min)

24 26 28 30 32 34 36 38 40

Figure A-15. Bay D Temperatures, Test With RHR


*

zi

M' 03

120

110

100

IL.

cc90 U

80

70

60

50

40 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38

TIME (min)

Figure A-16. Plant Sensor Temperatures, Test With RHR


z

9I 0~'

4{

A

NEDO-24542

APPENDIX B

POOL TEMPERATURE TRANSIENTS WITH RHR POOL COOLING

160

150

140

130

120

110

LL 0

100

2 90 w

80

70

60

50

40 60 70 80 90 100 110 120 130 140

TIME SINCE SRV OPENED (min)

Figure B-1. Bay C Temperatures, RHR Cooling


160

150

140

130

120

- 110 LL 0

80 100 < 50 wU 90 J I-n

80

70

60

50

40 60u 90 100 110 120 130 140


Figure B-2. Bay B Temperatures, RHR Cooling


140

130

120

110

100 LL .

LU

0 80

70

60

50

40 60 70 80 90 100 110 120 130 140


Figure B-4. Bay E/F Temperatures, RHR Cooling


140

130

120

110

100

U

0 90

a

70

60

50

40 60 70 80 90 100 110 120 130 140


Figure B-3. Bay H Temperatures, RHR Cooling


*

140

130

120

110

100

U0

D 90 t

Lii CL Ln

80

70

60

50

40 60 70 80 90 100 110 120 130 140


Figure B-5. Bay D/E Temperatures, RHR Cooling


140

130

120

110

100

D 90

w CL)

70

60

50

40 60 70 80 90 100 110 120 130 140


Figure B-6. Bay D Temperatures, RHR Cooling


140

130

120

110

100

U

0 90 <

80

70

60

50

40 60 70 80 90 100 110 120 130 140


Figure B-7. Bay D Temperatures, RHR Cooling


NEDO-24542

APPENDIX C

SRV STEAM FLOW RATE

NEDO-24542

APPENDIX C

SRV STEAM FLOW RATE

Calculation of expected SRV steam flow rate gave a bounding value of

849,000 lbm/hr. Evaluation of the data taken in the first test determined

that the SRV steam flow rate was actually lower. This allowed the SRV to be

open for an additional minute before reaching bulk pool temperature limits in

the second test. The three techniques used to determine this steam flow rate

are presented here. The results of the three techniques are within 5%. A

presentation of each calculational method follows.

C.1 SUPPRESSION POOL HEATUP METHOD

Based on the anticipated SRV steam flow rate of 849,000 lbm/hr, the valve was

opened long enough to heat the pool to a calculated bulk temperature of 950F.

Looking at the results of the first test, the bulk temperature was 4890 F at

the end of the test (Figure 5-2). Since the relationship between steam flow

rate and time to heat the pool to 950 F is linear, the ratio of expected to

actual test results will give the actual steam flow rate.

expected pool heatup rate expected steam flow rate. (C-1) actual pool heatup rate actual steam flow rate

actual steam flow rate = expected steam flow rate (C-2)

(actualN exact )pool heatup

m = 849,000 lbm/hr * (89 - 52.5)oF (C-3) actual 8(95 - 52.5)oF

m actual= 729,000 lbm/hr = 202.5 lbm/sec (C-4)

C.2 REACTOR PRESSURE VESSEL MASS BALANCE METHOD

During the extended discharge test, the plant process computer recorded turbine

steam flow and feedwater flow. A mass balance can be made for the reactor

pressure vessel to determine the SRV flow.

C-1

NEDO-24542

TSF TSF

RPV RPV FWF FWF

SRVF

BEFORE AFTER

Output from RPV - nput to RPV + Storage of RPV = 0 (C-5)

(TSF + SRVF) - FWF + STG = 0 (C-6)

where

TSF = turbine steam flow

SRVF = SRV flow

FWF = feedwater flow

STG = storage of RPV

Since measurements were taken when water level change and transients in TSF

and FWF had stabilized the storage term is removed.

TSF + SRVF - FWF = 0 (C-7)

Likewise,

ATSF + ASRVF - AFWF = 0 (C-8)

where

A = (flow before SRV is opened) - (flow after SRV is opened)

ATSF = 0.85 x 106 lbm/hr

ASRVF = 0 - SRVF

6 AFWF = 0.10 x 10 lbm/hr

SRVF = AFWF - ATSF (c-9)

SRVF = -0.10 x 106 + 0.85 x 106 (C-1)

SRV flow = 750,000 lbm/hr = 208.33 lbm/sec (C-11)

C-2

NEDO-24542

C.3 CONDENSATE STORAGE TANK LEVEL CHANGE METHOD

During SRV discharge, some of the water stored in the condensate storage tank

is drawn by the feedwater system to supplement the reduced flow of condensate

from the turbine-condenser. If a mass balance is made for the entire system,

the steam flow through the SRV can be determined.

SRVF

CF

CSTF

Output from RPV - input to RPV + storage of RPV = 0 (C-12)

Measurements were taken when water level change and transients had stabilized

so there is no storage term.

SRVF + TSF = FWF = CF + CSTF

where

SRVF = SRV flow

TSF = turbine steam flow

FWF = feedwater flow

CF = condenser flow

CSTF = condensate storage tank flow

(C-13)

C-3

NEDO-24542

Assuming no losses in the turbine-generator and condenser

TSF = CF

Then,

SRVF = CSTF

Likewise,

ASRVF = ACSTF

The condensate storage tank drawdown volume was accurately established at

18,400 gal/ft elevation. There is more confidence in this value than in the

flow rates read from strip charts of the second method. The difference in

water levels of the condensate storage tank before and after test no. 1 was

0.90 ft.

SRVF = 0.90 ft * 18,400 gal/ft *

* 60 min/hr

= 752,000 lbm/hr =

8.33 lbm/gal * 1/11 min

208.88 lbm/sec

C-4

(C-14)

(C-15)

(C-16)

SRV flow

(C-17)

(C-18)

NUCLEAR ENERGY DIVISIONS * GENERAL ELECTRIC COMPANY SAN JOSE, CALIFORNIA 95125

GENERAL ELECTRIC

TECHNICAL INFORMATION TITLE PAGE

EXCHANGE

By cutting out this rectangle and folding in half, the above information can be fitted into a standard card file.

DOCUMENT NUMBER NEDO-24542

INFORMATION PREPARED FOR

SECTION

Nuclear Power Systems Division

Containment Improvement Programs

BUILDING AND ROOM NUMBER PYD 409

AUTHOR SUBJECT TIE NUMBER 79NED101

B. J. Patterson 730 DATE August 1979

TITLE Mark I Containment Program GE CLASS Monticello T-Quencher Thermal I Mixing Test Final Report GOVERNMENT CLASS Task Number 7.5.2

REPRODUCIBLE COPY FILED AT TECHNICAL NUMBER OF PAGES SUPPORT SERVICES, R&UO. SAN JOSE, 79 CALIFORNIA 95125 (Mail Code 211) SUMMARY

This document presents the results of the Monticello T-Quencher Thermal Mixing Test that was performed in November 1978. The objective of the test was to evaluate the effectiveness of a modified T-quencher design (holes in one endcap) and a modified residual heat removal (RHR) return system (90-degree elbow and 10inch by 8-inch reducing nozzle at the end of discharge line) on thermal mixing of the water in the pressure suppression pool during safety/relief valve (SRV) discharge. Results of the test show that the modified RHR discharge system yields a marked improvement in thermal mixing over the modified T-quencher design.

MAIL CODE 90 5

GENERAL* ELECTRIC

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