ML20236Y432

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Forwards NRC Recommendations for Tests in Gkss Pressure Suppression Test Facility.Containment Code Review Group Reviewing Alternatives Described in Proposal
ML20236Y432
Person / Time
Issue date: 05/18/1977
From: Tong L
NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
To: Lummerzheim D
GERMANY, FEDERAL REPUBLIC OF
Shared Package
ML20236X982 List:
References
FOIA-87-160 NUDOCS 8712110317
Download: ML20236Y432 (16)
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Text

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I DISTRIBUTION 1

.SUBJ es CIRC CHRON '

BRANCH RF LS RF- i nr. D. Lamenhet' MAY1g'197f Der Bundesminister fur Forschung LS C M SF CY  !

und Technologies GLB CY l 53 Bonn 12 .LST CY Postfach 120370  :)

Federal Republic of Germany j

Dear Dr. Lummerrheim:

'At a combined Containment Review Group Meeting between representatives of FRG and USNRC on December 9. 1976, our people were asked for sugges .

tions for possible future testing at the SKS$ facility. We have p studied that' capability of that facility and have found that with some

modifications, multiple vent tests could be performed'st GKSS. We l-presently have a specific need for multiple' vent tests for an.applical tion described in the enclosed peper. The enclosed paper was worked. a out between NRC and 8KSS personne1' at a meeting on April' 4,1977, in. i

,' Hamburg and through subsequent soumunications. We understand that SKS$

... has already distributed this paper to the. ass 6ers of your Containment Review Group for their tw===adations.

I am sending 3be this paper as a draft proposal for pur. consideration .

and want to ask whether the scope of the testing can be. incorporated 'in the GKSS future test program. Specifically,'I muld like to know to dat extent our interests in tests of this kind coincide with yours.

J At the present time we are still studying our specific data need intern-ally. Our own Containment Code Review Group is reviewing ~the alterna-tives described in the proposal and over the next few weeks will deve-lop a more detailed test plan within the scope of the present draft' pro--

e ,'

posal. We expect this planning to continue' concurrently with your con-

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siderations possibly leading to a specific test program in the next few -i months. .'

l Sincerely,  ;

Original signed bx g21gyj7871203 g, k Q,1sistant Director

, MENZ87-160 PDR; for Water Ranctor Safety Research Division of Reactor Safety Research l1

Enclosure:

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NRC RECOMMENDATIONS FOR TESTS IN GKSS f '

PRESSURE SUPPRESSION TEST FACILITY REVISED DRAFT OF MAY 10, 1977 i

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1. Introduction-At the combined Containment:. Review Meeting of Dec. :9 and 10,i1976, .

in Cologne, the USNRC was asked for reconnendatioris? as.to future ' pressure suppression testing in the GKSS.facili_ty in! Hamburg Germany. .TAdditional' planning by the USNRC. has' resulted in concrete suggestions;for testing.

A test proposa1L has been prepared jointly. between-ther two organizations' ,

in meetings'on-March 30,-1977;and April 4,L1977;between.the:USNRCiand GKSS."

This proposal.' constitutes 'a ,part of the: GKSS follow-up programiin' pressure

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suppression and accommodates the USNRC in their need for data 7on multiplei vent configurations during. steam condensation. Specific measurements-are desired for pressure oscillations.(and pres!r0re: spikes)(during the condensation of relatively air free. steam ' discharging- from;inultiple',

large scale vents. In addition,' measurements on.the lateral ventT1'ohds

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in a multiple vent configuration should be included.

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2. Objective "

The' objective of these measurements is.to provide confirmatory data for the MARK-II BWR containment. .The~ MARK-II pressureLsuppresion designe is based on~ full scale single vent experimentsCthat simulate a LOCA tran-

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L sient. Of primary interest in the design are the ' dynamic loads;during -

steam condensation. In. addition the magnitude of 'the lateral loads on, the structure connecting theLvents needs: confirmation'..

The available experimental data for the MARKaII was obtained'o'n a full scale, single. vent (unit cell) arrangement. The objective.of-the proposed tests .is to obtain comparable data on'a. multiple': vent; test configuration. For the test data toL be' comparable' (unit cell vs.

u multiple; vents) the-tests have'to be conducted in' identical scale L and test parameters as. explained below.

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Pa e periments . indicate that the amplitudes of pressure oscilla '

tions are dependent'on'the number of vents;used in the experiment. The objective of these ' tests is therefore. to determine and quantify. this -

amplitude' dependence by. comparing experimental results from the unit cel1 l with multiple vent results. As reference case, the single. vent data of j the General. Electric Co. will'be used. The proposed:testrutilize the ~i GKSS facility to approximate multiple unit cells .in nearly the same scale  !

resulting in 3 or 5 vents for the size of the GKSS suppression. pool. .l

3. Experiment' Descriptions.

3.1 Scaling Considerations l 1

The approach ofLunit' cell' testing in pressure suppression is i

that, the relevant plant parameters are maintained in the experi-mont in full scale. These ' parameters ,for the MARK-II containment appear in Table 1 Column (1) and~(6). .The same parameters for the reference unit cell data'of GE with 20 anch and 24 inch vents appearincolumn(2)and(3). With this . approach, identical test i

conditions for.a multiple vent arrangement;are obtained if the I

valuesintable1fortheproposedtests, column (4)and(5)aresuf-ficiently close to those in column.(2) and (3) respectively. The values.

in column (4) apply to the. case of.three 24' inch vent-in the GKSS facility, wnereas column (5) applies to five 20 inch vents.

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3.2 Constructions -

Based on the present configuration'of, the pressure suppression test facility. (s'. GKSS-Report no'.11,15 AR B 02).a conceptual' design has.been prepared for two. multi-vent'configurationssas shown in Fig.1 A/1 B'and 2 A/2 B.

These designs-are considered as alternatives with a final selection 'to be made at a l'ater time.

Alternative 1 (Fig.1 A/1 B) is the~ five~ vent configuration where two headers are connected to the drywell via' two pipes of 0.45 m I.D.

This configuration represents a grouping of vents of a.BWR-MARX-II:

with0.51m(20. inch):I.D. Vents. It should be recogniz'ed.that:

the connection to the header. is smaller then the' vent: diameter resulting in an upstream flow constr'ictions. This situation is' largely av61ded in alternative 2 with 'three vents where the vents -

of 0.61 m (24 inch)I. D. are directly connected to the 'drywell .

However, in the 3 vant configuration, plant representative spacing of the vents is not as closely / matched with the reference tests as in the 5 vent configurations.

3.3 Configuration and Test Parameters-The values in table 1 show the degree of. correspondence between l

j. the proposed tests and the reference tests. Alternative 1 corresponds 1

closely with the reference test with a 20 inch vent'(Column ~3) in -

pool area to vent araa. Alternative' 2 on the other.. hand differs significantly from the 24 inch reference case with a 24 inch vent (Column 2) in the area parameter. 'The height dimension.is,not very well scaled in either of the two alternatives. 'Only the vent ~sub--

mergence, and to a lesser extent,-the downcomer clesrance.to;the pool bottom can be maintained at the same values as in the reference tests..-

The fact that the volume of the wetwell-air space and the drywell volu are not' scaled is not considered to be significant.: These parameters influence the pool swell phase of the transient, but'not the steam condensation phase which is the objective of this testing.

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i' A preliminary analysis' of the pressure and temperature response ,

was made by GKSS for alternative 2 with three vents. This analysis; was performed to demonstrate the capabil ;;y of the apparatus. The input.

data for the' calculations are listed in Table 2. The mass flow rates through the vents, using two orifices of 80 mm diameter to control the .

vessel dfscharge, are shown in Figure 3. The intermittent peaks in the mass flow appearing at about 10 seconds are due to level . swell in the vessel as predicted by the code. Figure 4 and 5 shown the pressure and temperature response in the drywell and wetwell. e computed pressure I response is quite similar to the calculated dryvell pressure response in 1

a MARK 11 plant. Figure 4 and 5, thus show that the volume relations between drywell and wetwell in the GKSS test facility are such that con-tainment pressure and therefore wetwell over-pressure can be adequately simulated.}

As was explained above, the early phase of the LOCA transient need not be accurately simulated. Only the later phase with relatively air free steam condensations is of interest. Based on these calcula-tions the range of interest in experimental parameters is estimated as follows:

- specific mass flux not to exceed 60 kg/m2 s

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- wetwell pressure ca. 3 bar - X ' '

- pool temperature 40 - 70'C -( '

- maximum pool depth 5.50 m /

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- clearence vent exit to pool bottom 2.44 /,

- vent submergence 3.06

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Figure 3 4 and 5 are . intended as sample results. Furtherl j

. calculations for the specific configuration selected would'have to ]1

. a be performed.

1 3.4 Instrumentations The level of instrumentation anticipated for)the proposed' l

-s experiments will . correspond .to the scope of instrumentation employed j

's in the reference GE tests. .This consists of pressure measurements

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to evaluate the dynamic loads for the . multi-vent tests.. pool.' tem-perature, and steam flow rate measurement. This amounts to a level of instrumentation, currently available in the GKSS facility. Addi-tional instrumentation is needed for the determination of

'I loads on the vent exit. A.loadeell measurement on 2 adjacent vents '{

independently and in orthagonal . directions should be included, f i

4. Anticipated Program Scope The nature of these confirmatory tests is such that a limited num-- ..

1 ber of multiple vent tests (up to. ten) over the parameter range listed- j in paragraph 3.3 are desired. The preferred scheduling of these tests ]

1 is such that data availability is planned for. late 1978. j l

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i'{D TABLE 1: COMPARISON OF MARK II PLANT, PSTF, GKSS-PSS, PRESSURE SUPPRESSION:

PARAMETERS

. Parameter UN!T: PLANT PSTF 'GVSS Mark II' range-

' (1 ) - (2)- (3). (4) (5)- (6).

Number of '

L Vents. 98- 1 3 5:

Diameter' m. '.0,597 0.61, 0.,51; 0.61- 0.51~ ..

in. 23.5L 24.0- 20.0 l24.0 20.0 20-24

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.~ c Drywell Vol m'3 64.01 /53.6 53.6- 19.33 11.6 :

Vent ft '2260. I 1892. '1.892. , 683.0 ! . 410.f 1800-2700~

Drywell Vol 228.9 m 7195.7^ 285.3. 66.24 57.2 Vent area ft 750.9 217.34]87.8; J2.0_936.0 575-91.4 2

, Pool area m 5.33~ '3.18 3.27 5.7 3.4 2

! Vent 'ft 57.4' 34.3 35.2. ~6 1. 36'.6 36.8-60.0' 1

. Pool area -

19.1 11.6' 17.4- 19.4J 16.8 12-20 , -'

Vent area o Submergence m 3.9 2.74 t 4.11 3.06. '3.06 Depth ft 12.8 9.00 + 13.5 10.0 10. 0 ~ . 8.8 - 13.5 '

DC Clearance m 3.66. 3.66z 2.44. '2.44 to Bottom ft 12.0 12.0' 8.0 8.0' 8.3 - 18.0 Overall m 18.3 -15.85- 6.8 6. 8 .

i' Height ft 60.0 52.0: =22.3. 422.3' 45.4:- 62.0' (1) Values based on La Salle (2) General Electric PSTF. values; -24 inch 'vent j (3) General Electrde PSTF values, 26 inch vent (4) Proposed GKSS configurations, three 24 inch vents (5) Proposed GKSS configurations, five 20; inch vents.

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Tab 1e 2 Input-Data for GKSS-calculations L (Diagrams 3 - 5)

Initt31 data in pressure vessels pressure: 111.3 bar temperature: 'O 31 9 C mass of water + steam: ,

8000 kg.

discharge area:~ 1.005 2 ,2 (2 x 80 mm ID) .

Initial data in containment (drywell and wetwell):  !

pressure: 1.0 bar temperature: 40.0 O C-mass of water in wetwell: 93 000 kg O.877 m 2 total vent' area:

(3 x 610 mm ID) submergence depth: 3.06 m 1

Drywell volume: 58 m 3 Wetwell volume including vents:- 130 m Vessel volume: 21,m 3-Pool surface arca incl. vents: 17 m2 after 50 secs.. Blowdown:-

mass release from vessel: -

2751.8 kg mass increase in.wetwell: 2413.8 kg:

pressure in.drywell: 3.23 har temperature in drywell -136.1 C pressure in wetwell 2.92 bar temperature in wetwell: 55.5 0C pressure in vessel: 22.2 bar temperature in vessel O C, 217.7 l

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