ML18031A117

Forwards Nonproprietary Versions of Kraftwerk Union Aktienglesellschaft Documents Transmitted 771228 & 780105. Responds to NRC

ML18031A117
Person / Time
Site:	Susquehanna
Issue date:	03/15/1979
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Parr O Office of Nuclear Reactor Regulation
Shared Package
ML17138A531	List: ML17138A530 ML17138A532 ML17138A533 ML17138A534 ML17138A536 ML17138A537 ML17138A538 ML17138A539 ML17138A540 ML17138A541 ML17138A542 ML17138A544 ML17138A545 ML17138A546 ML17138A547 ML17138A548 ML17138A549 ML18031A117 ML19284A738 ML19284A739 ML19284A747
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PLA, NUDOCS 7903150312
Download: ML18031A117 (65)

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1 i REGUI.ATORY INFOPMATION DISTRIBUTION SYSTEM (RXDS)

ACCESSION NBR 5 7903150312 OOO-DATE'! 79/03/15 NOTARIZED!

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TWO NORTH NINTH STREET, ALLENTOWN, PA.

18101 PHONE: (215) 821-5151 NORMAN W, CURTIS Vice President Engineering & Construction 821.5381 Mr. Olan D. Parr Chief Light Hater Reactors Branch No.

3 Division of Prospect Management U.S. Nuclear Regulatory Commission Hashington, D.C.

20555 SUSQUEHANNA STEAM ELECTRIC STATION NON-PROPRIETARY SUBMITTAL OF KWU DATA ER 100450 FILES 840-2p 172 PLA-327 DOCKET NOS. 50-387 50-~88

Dear Mr. Parr:

Transmitted. herewith are 40 copies of the non-propreitary versions of the twenty.Kraftwerk Union Aktienglesellschaft (KWU) documents transmitted wish our let ers of December 28, 1977 (PLA-207) and. January 5, 1978 (PLA-208) ~

This transmittal is made in response to your letter of April 28, 1978 regarding the witholding of the KHU proprietary documents from public dis-closure.

Very truly yours, N.H. Curtis Vice President-Engineering 8o Construction DFR/kes v903 1 503<+4.

PENNSYLVANIA POWER LIGHT COMPANY

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UNITEDSTATES

'NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20666 ORA'tDUiai FOR:

TERA Corp.

FROM:

SUBJECT:

US NRC/TIDC/Distribution Services Branch Special Document Handling Requirements

(;UP g+SSAL<<

R ggHI3IKR04 OEQ) considerations:

Do not send oversize enclosure to the PRO PDR.

Q Only one oversize enclosure sas received please return for Regulatory Pile storage.

Q Proprietary information - send affidavit only to the ilRC PDR Q Other: (specify) 1.

Please use the following special distribution list for the attached document.

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The attached document requires the following special cc:

DSB Files TTDC/DSB Authorized Si

as translated into ENGLISH

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CALCULATION HODEL TO CLARIFY THE PRESSURE OSCILLATIOHS Ii'3 THE SUPPRESSION CHAI'8ER AFTER VEiHT CLEARING N

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G ERHAN THE ATTACHED FILES ARE OFFICIAL RECORDS OFTHE DIVISION OF DOCUMENT CONTROL, THEY HAVE BEEN CHARGED TO YOU FOR A LIMITEDTIME PERIOD AND MUST BE RETURNED TO THE',RECORDS FACILITY BRANCH 016.

PLEASE DO NOT SEND DOCUMENTS CHARGED OUT THROUGH THE MAIL. REMOVALOF, ANY.

PAGE(S)

FROM DOCUMENT FOR. REPRODUCTION MUST, BE REFERRED TO FILE PERSONNEL.

zt7-DEADLINERETURN DATE I

RECORDS FACILITYBRANCH

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PROPRIETARY INFORMATION This document has been made NON-PROPRIETARY by the deletion of that information which was classified as PROPRIETARY by KRAFTWERK UNION AG (KWU).

The PROPRIETARY information deletions are so noted throughout the report where indicated by a)

Use of the term KRAFTWERK UNION AG PROPRIETARY INFORMATION.

b)

Use of blocked out areas by cross hatch bands in the report text and figures/tables, e.g.

iii) iv)

...." with a mass flow density ofQ~QBKg/m2s...";

~~ mm should be kept below ~ r ~ atm."

8/17/78

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gag TELEFUNKEN E 3/E 2-SI NUCLEAR REACTORS F

fthm, q 29 garch 1972 Dr. Mei/ru Report No. 2208 A'

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Classif ied s Class ZZ CALCULATION MODEL TO CLARIFY THE PRESSURE OSCZLLATIONS IN THE SUPPRESSION CHAMBER AFTER VENT CLEARING

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Dr. Koch, E 3/E 2-SZ

Xanper, E 312

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Dr. Neieehaupl/Schall E3/E 2

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Distribution list:

E 3/ V 4,-XVW (i2 x)

E 3 E 3/V

~ E 3/E E 3/R E 3/V4 E 3/V3 E 3/V X

E 3/V2 E 3/E 2 E3 /E 2-SI (3 x)

E 3/E i E3/R g

I 3/R i-AB 8 3/R i-ABS E 3/R 1-ABB E3/R 1

E 3/E 3 E (/E 3-VSF 8PbMokhek

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QONLDLSILZTY CLAUSE This roport ia baood on tho latost otato of acionce and technology as achievable by our boat offorts.

Zt makes use of the knovledge ond oxperionce of AEG

Hovever, AEG-TELEFUNKEN and all persons acting in its behalf make no guarantee.

Xn particular, they are not liable for the correct-

ness, accuracy and completeness of the data contained in this report nor for the observance of third party rights.

~ ~

AEG-TELEFUNKEN reserves all rights to the technical infozmation contained in this report, particdarly the right to apply for patents.

Purthor dissemination of this rcport ond of the Rnovlodge contained

'horoin aequiros tho eritton approval of ILES-TELEFUMKKX. Moreover, this rcport is ocemaudcatod indor the naaumption that it vill be handled confidontially.

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Table of contents Pacae Zntroduc tion 2-6 2 ~

2.1 2.2

2. 2.1 2 ~ 2 ~ 2 Oscillation of the air hubble - ttater mass system Equation of motion Perfonnance of the numerical calculation Data Parameter calculation 2"8 2-8 2-11 2-11 2-12 3 ~

Discussion 2-14 Conclusion Figures 2"16 2-18 2-4

To oxplain the periodic prcssure variations observed in KNW underneath the relief pipe of the suppression chamber and in QvH in the scram tnnk> a physical model is set up.

This model I

consists of the assumption that during the vent clearing process in the relief pipe the air cushion situated between the outflowing steam and the water slug is highly compressed

and, when it emerges frcca the pipe, begins to oxpand suddenly because of its over-pressure.

Zt is then compressed again by the pressure of the water mass loading it fraa above> etc., thereby creating an oscillation process.

.The oxcellent qualitative and quantitative agreement between the theoretical and oxperimental prcssure variations allows us to conclude that the obsorvod poriodic prcssure fluctuations can be doscribed by the assumod physical model of the oscillation of the system consisting of air bubble and water mass loading it from above.

2-5

I

1. Introduction Bofore the stcam 'braid'a produced during cloaring through the relief pipe, the vater slug situated in the pipe is first expelled, forming a highly comproased air cushion between the water "slug and the afterflowing steam.

Mhen that air cushion emerges from the pipe, it bogins to oxpand again suddenly in order to come into equilibrium with the surrounding pressure (vhich is composed of the pressure in the suppression chamber and the hydrostatic pressure)

The suppression chamber vater mass loaded hy the emerging air cushion ia driven upward until the influence of the gravitational force and of the underprevsure forming in the air bubble as time passes (which ia producod hy tho continued upvszd movosent of the water roaulting from the mechanical inertia principle) leads to a rovoraal of the pzocesa and the air hubble ia compressed again by dovnvard motion of 'the vater mass.

That is folloved by roneved expansion, otc., etc.

The air bubble - water mass system under consideration thus represents an oscillatory system vhose oscillation persists until the air bubble has risen to the vater's surface and breaks there or until the oscillation amplitude becomes negligibly amall due to strong damping and lateral outflow of the water that ia throvn upward.

In the following ve now aet up a highly simplified model of this oscillation procoas and compare the rosulta obtained from it with 2

6

the poriodic prcssure variations observed oxperinentally in KWW and in Qw8 [4].

fl) Rupp, Eismar, Pohl!

KWW <<Results of the relief valve tests with the special instrumentation.

AKG "E3"2l60

2.

Oscillation of the air bubble - water mass s stem 2.1 Eguation of motion To calculate the oscillatory bohavior of the air bubble and the water mass loading it from above, we make the foU.owing highly aimplified assumptions:

a) After emerging from the. relief pipe, the air bubble has the shape of a flat. cylinder (see Figure below).

Ac P>>

pK ~ pressure in suppression chamber o, Vi 7 b) The air bahMo does not xioo to the aurface of the water during the oscillation procoss (the influence of this process is taken into consideration by a parsmetriration of the air bubble's oubmergence).

c) The air bubble expands only in the vertical direction

{assuming a flat cylinder, the horizontal expansion is approximately negligible relative to the vertical oxpansion)

~

d)

The water mass lying above the bubble does not change its ohape during the oscillation process (thus, no water flows 2

8

away ).aterally during the lift, and no water flows in from. the

, side during the drop).

Prom the center-of~ss theorem we obtain the equation of motion of the water mass:

- (1)

The acceleration of the water mass m is maintained by gravitation, the pressure p of the air bubble on the water mass axnre it, anf the suppression chateau pressure pK.

x is the coordinate of the center of mass of the water mass, P is the boundary surface area between the air bubble and water mass.

Since the oscillation procoeds rapidly onough, we can assume an adicIbatic ohLngo of atato of the gas.

Theroforo, the relation between the instantaneous state (p, V, T) and the initial state (p

Vo< T ) which prevails immediately after the oxpulsion of the air bubble frcca the rolief pipe roads'or air, x The change of the gas volume from V to V corresponds

<<xactly to 0

the liftof the water mass.

Thus:

(3)

V s V

+ F ~ x, K

from which we obtain for the pressure frccn Eq.

(2):

2-9

I

(4)

If we now express the state variable V in terms of the state 0

variables p, V for the initial state of the quantity of aii a'

which is present before the beginning of the vent clearing process:

(5) then we get for the pressure p:

(6)

If we insert this oxpression into the difforential equation (1) we finally obtain for the oquation of motions (7) in which we have set m ~ pgh for the mass m of the water (p< is the density of the water, h is tho aubmorgonce of the air bubble).

E In this differential oquation of oocond order,. the variables p

hg F and Va appear as parameters (pa ~g kg/em e Pg ~ 4 kg/em

) ~

The oquation can be aolved roadily by a numerical me+cd (Runge-Rutta, Euler, otc.) and loads to the contormf~ss motion of the water mass as a function of timei x ~ x(t).

The dependence of the prcssure on time, p ~ p(t), can finally be determined from Eq.

(6) ~

2 10

2 2 Performance of the numerical calculation The input quantities in Eg.

{7) consist of measurable data Oaaximum pressure, normal nir volume) and cLlso of data resu1ting from the assumption of the calculated mode1.

In order to include quantitatively the effect of those calculation assumptions, parameter calculations vere performed starting from a reference cape

~

2.2.l Data The data for the reference case vere:

a) Initial pressure p

c corresponding to a moasurcmcnt of the maximum pressure b) Spocific troight of the eaters pg ~~~1 kg/m c) Hoight of the eater cashion hc h

The air bubble was assumea to be at the height of the end of the relief pipe.

Therefore, h + submergence of the relief pipe d) Surface area of the cylindrical steam hubble:

It was assumed that the stcam bubble expands cylindrically as far as the odge of the suppression chacnber.

Therefores 2 ll

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o) Normal air volume V s

The air volume in the relief pipe was determined in AEG-E3/

R2-2160 to be FXIYIYIYIX/Pili arith this data ve obtain for the constants The numerical evaluation was accomplished by using the Runge-Kutta method vith a time sharing system.

The result of the cal-,

culatioh is illustrated in Figure 2.

A comparison with the measured pressure variation {Pigure '1) roveals good qualitative agreement and thus provides the aought proof that the observed osciDations vere interpreted correctly.

Por a quantitative interpretation it is necessary to perform several: {parameter) calculations to exhibit the influence of the various influential parameters on the oscillation data.

2 ~ 2 ~ 2 Parameter calculation The &put quantities into the oscillation model are based partially on measurements and partially on assumptions concerning the shape of the air bubble.

To determine the influence of this "arbitrary" initial data, it ia necessary to perform a parameter calculation.

2 12

The following quantities were varied in the parameter calculation:

po Prcssure ratio of the blowout process pa h

c Distance of the air bubble from the water surface V

F This quantity represents a form factor, since, in",

addition to the known quantity V, it also contains an assumption concerning the spreading oi the surface area (cylindrical).

A survey of the calculations performed is given in Table 1, The variation of the pressure in the air bubble and the displace-ment amplitude of the water layer for a half oscillation period are illustrated for the various calculations in Figures 3-11.

From them we can dotormine tho various characteristic magnitudes characterising the oscillation c Maximum vortical displacement Minimum prosnure ratio (Half) oscillation period and oscillation frequency The corresponding values for the computation runs are listed in Table 1 ~

A graphical evaluation was performed in Figure 12.

2 13

l

3 ~ Discussion The frequency is of primary intorost in connection vith the aLeasured pressure oscillations, since only through it is it pos-sible to confirm quantitatively the calculation results.

tahe maximum pressure is an input quantity into the calculation> the 1

vertical displacement of the vater was not measured.)

The only 'arbitrary" input quantity into the computation model was the bubble's surface area F, which contained a hypothesis con-cerning the (cylindrical) shape of the air bubble.

The influence of the corresponding parameter (it involves the parameter V /F) on the frequency therefore provides an indication of a possible quantitative-agreement between calculation and measurement.

As follows fran Pigure 12a, such agreement-does acist for a relatively II flat air-bubble shape with a diameter of

'7r KRAFTWERK UNION AG PROPRIETARY INFORMATION

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This result io confirmed qualitatively by the observed rapid spreading of the air oxpelled Curing the blow-out.

The bubble's submergence h decreases during the oscillation process.

Zt follows from Pigure 12a that this

{as in the tests) is asso-ciated tCth a sharp increase of the frequency and therefore pr'-

vides another confirmation of the correctness of the physical',

model.

The maximum pressure p

{or the ratio p /p

) is fixed by the blovdown process

'and can only be changed by design measures.

As expected, this quantity influences primarily the minimum pres-sure ratio and the maximum vertical displacement

{Pigures 12b-and 2-lS

4. Conclusion The purpose of the study was to provide computational proof that the pressure oscillations occurring in the condensation tests are related to the amount of air expelled at the beginning of the blowdown.

A physical model was set up and calculated in accordance with the concept that the expelled air, which is at an overpressure relative to the steady-state conditions, forms a cylindrical ical bubble and represents an oscillatory structure together with the water layer lying above it.

Using this simplified model and the measurable input magnitudes, and aswuaing a particular dimension of the cylindrical air bubble, both qualitative and quantitative agreement was found between the sLeasured and calculated oscillation mode and, the frequency behavior of.the oscillation was correctly predicted.

2 16

KRAFTWERK UNION AG PROPRIETARY INFORMATION 2>>17

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