ML18031A304

Responds to .Forwards Comparison of Facility Pool Dynamic Loads Program W/Acceptance Criteria in NUREG-0487

ML18031A304
Person / Time
Site:	Susquehanna
Issue date:	11/02/1979
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Parr O Office of Nuclear Reactor Regulation
References
ER-100450, NUDOCS 7911140218
Download: ML18031A304 (20)

Text

ACCESSION NOH F ACILo 50 387 50 388 AUTH'AME CUH T IS s N ~ I'< ~

REC IP, NAME, PAHHsU ~ DE REGULATORY luFUHMATION OISTHIHuf ION SYSTEM (RIDS)

7911140218 DOC ~ DATE: 79/11/02 NOT AH I LEO; NO DOC~ET

~

Susquehanna Steam Electric Stations Unit li Pennsylva 050 87 Susquenanna Steam Electric Stations unit 2s Pennsylva 050 03 AU f HOR AFF ILIAI ION Pennsylvania Power 8 Light Co.

HECIPIENT AFFILIAflUN Lignt eater Reactors Branch 3

SUBJECT:

Responds to 791010 ltr,Forwards comparison of pool dynamic loads program at feei)ity w/acceptance criteria in NUREG-0487.

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f OTAL IVUMBEH OF COP IES IEEQUIREO; L I TH EIVCL

TWO NORTH NINTH STREET, ALLENTOWN PAr 18101 PHONE: (215) 821 5151 NORMANW. CURTIS Vice President. Engineering & Constructipn 821-5381 go/

2 197~

Mr. Olan D. Parr, Chief Light Water Reactors Branch No.

3 Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, DC 20555 DOCKET NOS.

50-387 50-388 SUSQUEHANNA STEAM ELECTRZC STATION MARK II POOL DYNAMICS LOADS PROGRAM ER 100450 FILE 172 PLA-417

Dear Mr. Parr:

Mr. S. A. Varga's letter of October 10, 1979 requested a definition of the pool dynamic loads program being relied on by each Mark,ZZ Owner.

You will find attached a comparison of the pool dynamic loads program being used on the Susquehanna project with the NUREG 0487 acceptance criteria, Lead Plant Position and the Generic Long Term Program.

This comparison supersedes the comparison provided in our letter of February 2, 1979.

As with that earlier comparison, the final acceptance of the use of SRSS for combining dynamic loads is assumed.

This is in accordance with the directions of the NRC staff at the October 19, 1978 meeting with the Mark IZ Owners.

With respect to the Susquehanna plant-unique programs, a review of the attached comparison will show three such areas:

Use of data from the plant-unique GKM-ZIM tests for additional verification of the condensation oscillation pool boundary loads.

These tests consist of a series of transient steam blowdowns simulating various loss-of-coolant accident conditions.

The facility is constructed to be very closely prototypical of a single vent configuration in the Susquehanna containment.

A more complete description of these tests is provided in the two reports submitted with our letter of October 25, 1979; "GKM-IIMTests, Test Philosophy and Matrix" - adapted from KWU Working Report R 141/136/79 and "GKM-IZM Condensation Tests, Description of the Measurement Concept",

KWU Working Report R 541/10/79.

The decision to proceed with these tests was made in January, 1979 based on our assessment that they would provide us test data earlier than the

~ Mark lI generic 4T tests, that the prototypical nature of the data would help expedite evaluation and licensing review and that, in addition to pool boundary pressure data, prototypical vent lateral load data could also be obtained.

Q,rP>~

I E

PENNSYLVANIA POWER 8

LIGHT COMPANY TglltgP WlF

Page 2

E Testing at the facility began in early October and is scheduled to be completed by January, 1980.

We expect to provide a test report in April, 1980 and an evaluation report in July, 1980.

2)

Use of data from the GKM-ZZM tests as additional verification of the Mark II generic vent lateral load definition provided in NEDE-24106-P.

The above discussion on the GKM-IIMtests for condensation oscillation loads applies for this activity also.

3)

As no Mark II generic program exists for calculation of submerged structures drag loads due to LOCA steam condensation processes all utilities are using plant-unique methods.

For the Susquehanna and Limerick projects, Bechtel has developed a methodology which uses the information developed under Task A.16, "Improved Chugging Load Definition", for identification of a vent source load.

A Greens function solution will then be used to provide the velocity and acceleration fields in the suppression pool.

A similar Greens I

function solution will also be used to establish the velocity and acceleration fields in the suppression pool due to LOCA air bubble charging.

A report detailing the methodology is scheduled for submittal in April, 1980.

As noted in Mr. Varga's letter, design differences between the various Mark ZZ Plants do exist.

When these differences in design are combined with the various plant licensing schedules, it becomes difficult for all eight utilities to agree on a common program for closure of a technical question as broad as the Mark ZZ pool dynamic loads program.

You can be assured though that each utility is, in turn, sensitive to the resource constraints now placed on the NRC staff and will work towards the further development of generic programs for the ultimate closure of the Mark II program.

Very truly yours, J (gJ N.

W. Curtis Vice President Engineering

& Construction Attachment

REVIEW OP SUSQUEttANNA SES llHITS 1 6 2 POOL DYNAHIC LOADINGS POR LOCA AND SRV EVENTS COHPARISOH WITH NUREC 0487 LEAD PLM)T I'BOGBAH AND GEtiERIC LOt)C TERH PROGRAlt Revision I

~IO 79 NRC ACCEPTAHCE CllITERIA NUBEG 0487 10 78)

I~

LOCA RELATED HYDBODYNAHIC LOADS LEAD PLA))T POSITION (JULY 23 1979)

CEtlEBIC LOHC TERN PltOGRAH POSITION SUSQUElthNNA POSITION h.

Submerged Dcundary Loads During Vont Clo'aring.

33 psi ovurprassuro ad4a4 to local t)ydroatatic bolo<< vent oxit (walls an4 basamat)-

linear attenuation to pool surface.

Harch 20, 1979 lattor.

24 psi statically applia4 to surfacos below vent oxit (attenuate to 0 psi at pool surfaco) for poriod of vent cloaring.

Zlmmar and LaSallo mast NUBEC 0487.

24 psi ovarprassuro static-ally applied with hydro-static prosaura to surfaces below vent exit (attenuate to 0 psi at pool surface) for pario4 of vent cloaring por Harch 20, 1979 lottar from CE.

Following load plant/Iong tera position.

8, Pool Swell Ixtads.

1.

Pool Swell hnalyt;ical Ho4el (PSAH) a.

Air bubble prassure-usa PSAH described in tlEDE-21544-P.

(a)

Accept NUREG 0487 (a)

Accept NUBEG 0487 (a)

Accept NUREC 0487 b,

Pool swell elavation-uso PSAH described in NEDE-24544-P with apoly-tropic exponent of 1.2 for wet<<all air com-pression.

(b)

Accept )tUREG 0487 (Shoraham Pabruary 16, 1979 lattor raamphasixas rosponse to Question 020.68)'b)

Use I'SAN with poly-

= (b) tropic exponent of 1.2 to a maximum swell hoight which ia tho groatar of 1.5 vent submarganco or tha ele-vation corresponding to chu drywall floor uplift 4 p uaod for design assassmant par response to ()wast(on 020.68 and February 16, 19'79 latter frca Shoraham.

Pal lowing long tetta position.

I I

Page 2

HRc hccePTAHce cRITERIA (NUREG 0487 10 78) c.

Pool swell veloclty-uso PSAN described ln HEDE-24544-P multlplio4 by a factor of 1.1.

d.

Pool swell accoloration-uso PSAN doscrlbod ln NeDE-24544-P.

LEAD PLANT POSITION JULY 23 1979)

(c)

Accept NUREG 0487 with volocity vs olevatlon obtalne4 from PSAN.

(4). Accopt NUREQ 0487 GENERIC LOtlG TERN PROGRAM POSITION (c)

Accept NUREG 0487 with velocity vs olovation obtalne4 from PSAN.

(4)

Accept HUREG 0487 SUS()UENAHHA POSITION (c)

Following load plant/

long term position.

(d)

Aces pt HUREQ 0487 o.

Motwoll air comprosslon-uso PSAN described ln HeDE-24544-PE (o)

Accept liUBEG 0487 (o)

Accept HUBEQ 0487 (o)

Accept HUBEG 0487 f.

Drywall pressure history-unlquo based on NEDN-10320.

(f)

Accept NUREG 0487 (f)

Accept HUREQ 0487 (f)

Accept NUREG 0487 2.

Lodds on Submorge4 Boundaries.

Haxlmum bubble prossuro pro-dictod by PSAN ls to bo added uniformly to local hydro-static bolo>> vont oxlt (walls and basemat) and linear atten-uation to pool surfaco.

Apply to walls up to maximum pool swell elevation.

Accept NUREG 0487 Accept NUREG 0487 Accept HUREG 0487 3.

Impact Loads a.

Small structures - (For horizontal pipes, I-boamsg and other similar struc-turos having ono dlmonslon

~20 in.).

Tho loading function shall havo tho versed sino shapes p(t) ~ 0.5 p (1WOS 2~+)

(a)

Accept HUREG 0487 (a)

Accept NUREQ 0487 (a)

Accept NUREG 0487

Page 3

NRC ACCEPTA))CE CRITEAIA NUREG 0487 10 78 LEAD PLANT POSITION JULY 23 1975)

GENERIC ID')G TERN PROGRAH POSITIOl)

SUSQUEHANHh POSITION b.

Largo structures-not applicablo, no largo structures are iopacte4 by pool avail.

o.

Grating - The static drag load, P

, is to be calculated by fonaing ss tho product of ~P,froa Figure 4-40 of REDO-21060'ov.

2 ~ and the total area of tho grating.

To account for the dynastic nature of tho initial loading, tho static drag loa4 is increased by a nultiplier given by<

(b)

Hot applicable (no largo structuros)

(c)

Accept NUREQ 0487 with velocity vs elovation obtained from PSAH.

(b)

Not applicablo (no largo structures)

(c)

Accept NUREG 0487 Mith volocity vs elevation obtaine4 tres PSAH.

(b)

Not spplic able (no large structures)

(c)

Pol1 cuing load plant/

long tera position.

SE ~ 1 + / 1 + (0.00641f) 0 Natwell hir Ccutprsssion

~.

Hall loads - directly apply (a)

Accept NUREQ 0487 the PSAH calculate4 pressuro dus to wetwell ccepression.

b Diaphrags upvard load -

(b)

Accept NUREQ 0487 calculate A PUP using tho correlation c

+PUP ~ 8.2 - 44P, for Ok P 4 0.13 A PUP ~ 2.5 psi, for FP 0.13 (s)

Accept NUREQ 0487 (b)

Accept NUAEQ 0487 (a)

Accept NUREG 0487 (b)

Accept NUAEQ 0487 uhers)

P ~ AB hP VS

Pago 4

NRC ACCEPT)uiCE CRITERIA NUREQ 0487 10 78)

LEAD PLANT POSITION (JULY 23 1979 GENERIC LOtiQ TERH PROGRAH POSITION SUS()UEUANNA POSITION AB ~ break area AP nat pool area AV ~ total vent area VS ~ initial watwoll air spaco volume VD ~ drywall volume 5.

Asymaatrlc Load.

Apply tho maximum air bubble pressure calculated from PSAH and a minimum air bubblo pressure (xoro lncroase) in a worst case dlstrlbutlcn to tho watwoll wall.

Use twico tho 101 of maximum bubblo prossure statically applied to 1/2 of the submerged boundary (with hydro-static pressure) proposed ln Harch 16, 1979 lottor from GB.

)

C.

Steam Condensatlon afd Chugging Loa4s.

1. 'awncomar Latora Loads Uso twice the IOS of maximum bubble pressure statically appllod to 1/2 of tho submerged boundary (with hydro-static prossuro) proposed ln Harch 16, 1979 letter from GE.

Following lead plant/long term position.

(a)

Accept NUREQ 0487 for statio analysis.

(1) tho dcwnccmer is 24 inches ln dia-meter (11) tha downcamar dom-inant natural frequency ls ~ 7 Ns, submerged (ill) tho dmmccmar is unbracad or braced at or above approx.

8 1't. from the exit.

a.

Single vent loadsa

- h static oquivalent load of B.S KIPs shall bo used providads (a)

Use slnglo vont dynamic lateral load developed under Task h-13 (BEDE-24106-P).

(a)

Following (a) long torm program

~

Load defini-tion par BEDE 24106 P

and confirma-tion through Task A.13 and plant unique GKH-IIH tost data on lateral bracing loads.

GKH IIH test report sched-uled for sub-mittal in April, 1980 and evaluation report schedule4 for July, 1980.

Page 5

NRC ACCRPTANCR CRITERIA (NUREG 0487 10 78)

LEAD PLANT POSITION JULY 23 1979 GENERIC LONG TRRH PROGRAH POSITION SUSQURllhNNA POSITION

- h static equivalent loa4 of 8.8 Nips multiplie4 by the ratio of the natural frequency and 7 Nx for dominant natur-al frequencies be-tween 7 and 14 Ua.

Other restrictions in {I) an4 {iii)apply.

- If the natural fre-quency of the dcwn-comer is ~

14 Ns or if bracing is closer than 8 ft.

above the exit, a plant specific dynamic structural calculation shall be performe4 using a dynamic load defined bye P(t) - P sin~i 04.t <~

0

~ Ol for t 4. 0 an4 t vg where>

2 msec 4 'C C10 msec, and the impulse I

2 F (y/'lC) is 200 lbf-sec.

Restrlchon (I) also applies.

Page 6

HRC ACCEPTANCE CRITERIA HUREG 0487 10 70 LEAD PLANT POSITION (JULY 23 1975 GENERIC mm TERN PROGRAN POSITION SUSQUEIIANHA POSITION b

Hultipla vent loads-Usa tha load specified in Piguro 4-10b ot HEDE-21061-P, Ruv. 2, multi<<

plied'by a tactor of 1.26 for,dovnccsurs vith natural fruquuncios groat. ur than 7 llx.

Por natural truquunciaa gruatur than 7 lit, apply an additional suit)plier oqual to thu ratio of its frequency an4 7 llx.

(b)

Accept HUREG 0487 (b)

Uso nulti>>vent dynaaic (b)

Polloving lateral loa4 devalope4 long tera under Task A"13.

prog ran.

2 '

Subaargo4 Boundary Loads a.

Iligh Stean Plux Loads Sinusoidal prcssure tluctuation added to local hydrostatic.

Amplitude united bulow vent exit, linear attenuation to pool aurfacu.

4.4 psi puak-to-paak asplitudu.

2-7 llz traquuncios.

HEBE-21061-Pi ReVo 2

(a)

Accept HUREG 0487 (a)

HRC criteria used as intoriue spec.

pending cosplotion ot Task A.17 ~

Stean Condensation Oscillation Tost".

Additional froquancy ranges also boing evaluatu4.

(a)

Accept HUREG 0407 except 3.5 psi puak-to-peak asLp-litudo used.

Conf iaaation of design loads to be based on plant unique GKH-II!l toots.

(atb)

GIOI-IIN test rupert schudulo4 for submittal in April, 15SO and ovaluation report schadulo4 fcr July, 1500.

. Pago 7

HBC hCCEPTBHCE CRITERIh NUREG 0487 10 78)

LEBD PLBNT POSITION JULY 23 1979)

GENERIC LONG TERN PBOGRBH POSITION SUSQUEllhlUlh POS T OH b.

Hedium Stoma Flux Loads Sinusoidal prossure fluctuation added to local hydrostatic.

hmplituda unfioaa below vent exit, linear attenuation to pool surface.

7.5 psi peak-to-peak amplitude, 2-7 Nr froquoncios.

NEDE-2l061-P, Rav, 2.

(b) hccept NUBEG 0487 (b)

NRC criteria used as interium spec.

pending completion of Task h.l7 "Steam Condensation Oscillation Tost" hdditional frequency ranges also being svaluatod.

(b) hccept NUBEG 0487 except 10.0 psi peak-to-poak amplitudo used.

Confir-mation of design loads to bo based on plant unique GKH-IIH toots.

o, Chugging (o) hccept HUREG 0487 Uniform loading condition-Haximum amplitude uniform bolou vent exit, linoar atten-uation to pool surface.

44.8 psi max ovorprossuro,

-4.0 psi max under-prassuro 20-30 Ns frequency.

(Pending rosolution of PSI concerns)

NEON-21061"P, Rev.

2 ~

(0)

NBC cri'teria Used as deuterium spec.

pending ccmplotion of Task h.16 "Improved Cbugging Load Definition".

(o) hccopt NUBEG 0487 (lead plant position)

Resolution oi FSI concerns through Task h,16, hsymmetric loading condition - Haximum amplitude unform bolos vent exit - linear attenuation to pool surfaco.

t20 psi max

~I

Page 8

I HRC ACCEPTANCE CRITERIA (NUREG 0487 10 8

LEAD PLhllT POSITION JULY 23 1979 GENERIC LOHO TERN PROGRAH POSITIOH SUSQOEIIANHA POSITION ovarprassuro,

-14 psl max undorpressuro, 20-30 Nx froquancy, peripheral variation of amplitude follows observed statistical distribution with maximum an4 minimum diametrically opposa4, NEDE-21061-P, Ruv.

2 ~

IX~ SRV"REIATED NYDRODYNAHIC IDADS h.

Pool Temperature Limits.

hll Hark II facilltiau shall uso quencher typu devices.

Thu sup-pression pool local tempuraturo shall not axcuad 200 P for all 0

plant transients involving SRV opurationa.

Haasuremunts from temperature sensors located on tha containmunt sall in thu sector containing tho dischargo device at tho sama elevation as the davico can bu used au local indication.

Accept HUREO 0487 Document vill bo prepared using additional PPAL test data to support no (local) temperature limit for quanchars.

Pollcwing long term programo Schedule calls for submittal of report in January, 1980.

B.

Air Clearing Loads.

~.

Huthodology for bubblo loa4 prediction T-quancher-uau ramahaad methodology described in Sac.

3.2 of NED0-21061-P,

Rav, 2

{a) haoept HUREO 0487 (a)

T-quencher loa4 pro-

{a)

Pollwing sentod in Susquehanna long tera DARy Sec+ ill~ 3 ~

pLog ram

Page 9

NRC hCCEPThNCE CRITERIh NUREG 0407 10 70 LEhD PLhNT POSITION JULY 23 1979)

GENEAIC LONG TERN PROGRhH POSITION BUSQUENhNNh POSITION X-quencher - uso Soo. 3.3 of REDO 21061 PJ Reve 2 ~

X-quencher load definition being devolope4 by Burns h

Aoo baaed largoly on Cacrso tost 4ata.

b.

SRV Discharge Loa4 Cases.

Tho Collcwing loa4 cases shall be considore4 Cor design evaluation oC containment structures and

'quipment inside tha ccn-tainmenti

l. Single volvo, first an4 subsequent actuation.

2.

hDS valve actuation.

3 ~ Two ad]acent valve first actuation.

4. hll valves dischargod sequentially by setpcint.

5. hll valves discharged

- simultaneously by assuming all bubbles are oscillating in phase.

(b):

Loa4 casa 5 is not

{b) roalistic and should nct bo included Cor oval'uaticn.

Nultipie, valve cases will bo a44rassa4 in plant DhR's.

T-quoncher load case 4

is not include4 for evaluation.

It is bounded by Susquehanna DhR Bections 4.1.3 ~ 1 an4 4 ~ 1 ~3.2.

tb) eollcwing long tora program+

c, Bubblo Prequency.

T-quencher - a range cC bubble frequency of 4-12 Ns is tho minimum range that shall ba

. evaluated.

The range shall be increased if coquircd to includo tho frequency predictod by tha ramehea4 methodology together with t 50'argin.

(c)

Plant'nique olosura reports deCina method used to daCino bubble frequency.

(c)

T~uanchar bubble frequency is prosanto4 in Susquehanna DhR~

Section 4.1.3.

{o) tollcwing long term program.

~I

Page 10 NRC ACCEPTANCE CRITERIA (HUREG 0487 10 70)

LEAD PLANT POSITION (JULY 23 1979)

GENERIC LONG TERN PROGRAN POSITION SUSQUEHANNA POSITION X-quenchor - a range of bubble frequency of 4-12 Ns shall be eve luatod.

X-quencher bubblo frequency boing developed by Burns S

Roo based largely on Caorso tost data.

N/A.

C.

Quenchor Arm and Tio Down Loads.

l.

Quencher hrm Loads.

Vortical and lateral arm loads Accopt HUREG 0487 aro to bo developed cn tho basis of bounding assumptions for air/water dischargo from the quenchor and consorvative combinations of maximum/

minimum bubblo pressures acting on the quencher per NEDE-21061-P

~ Rev.

2 X-quencher - Accept HUREG 0487 T~uencher arm loads are presente4 in Susquehanna DAR, Section 4.1.2.5.

N/h.

Pollowing long term program+

2 ~

Quencher Tie-down Loads.

The vortical and lateral arm load transmitted to tho basomat via tho tio-down plus vertical transient wavo and thrust loads calculated from a standard momentum balance are to bo calculato4 based cn consorvativo clearing assumptions por NEDE-21061-P, Rov. 2.

Accept HUREG 0487 X-quencher - Accept HUREG N/A.

0487 T-quenchor tie-dawn loads Pollowing long aro presonte4 in Susquehanna term program.

DAR Section 4.1.2.5.

Page ll tlRC ACCEPTANCE CAITERIh lltUBEG 0407 10 78)

LEAD PLAttT POSITIOH JULY 23 1979)

GENERIC IOttQ TEBH PROGBAH POSITION SUSQUEI)ANNA POSITION III MCA SAV SUBNEBGED STRUCTURE LOADS A.

LOCA/SRV Jet Loads.

1.

LOCh Dcwncomor Jet Loa4 Calculate based on methods described ln tlEDE-21730 and tho following constraints and modiflcatlonss

{a) Standard drag at tho timo tho Jot first encountora the structure must bo multiplied by tho factort Hill address criteria by proposing corrected equa-tions in l.a and l.b.

Bing.vortex modol including PoiioMing

~

potential function for lea4 plant induced flow being finalized. position, Horo approprlato acculoration drag consideration to be identifie4.

Ilavo modified earllor position to follow

~

Load Plants.

Eval<<

uatlon of quencher for higher Jot loa4s ln process.

6 V 1

4 CD AX Ri uheras e

a C0 AX acceleration volume as doflne4 ln HEDE-21730 drag coefflclont as doflned ln HEBE-21730 pro)ected area as defined in tlEDE-21730 vent oxlt radius

Pago 12 NRC ACCEPTANCE CRiTERIA

{NURBG 0487 10 78)

LEAD PULHT POSITIOH JUIY 23 1979 GENERIC MNQ TBRH PROC RAN POSITION SUSQUEINNtQL POSITION (b) Porcos in tho vicinity of tho Jot front shall bo cceputod on tho basis oi'ormula 2-12 and 2-13 of NEDE-21730.

Tho local volocity, U~, and accoloration, Uoo

~

aro to bo consorvativoly calculatod by tho eothods of NEDE-21471 from tho potontial functiona

~

U

~

V Cos 8 2r lrtloroI ra8~

U spho rica coordinatos from fat, front got voloc:ity from NEDE-21730 initial volumo o! uater in tho vsnt

{c) Aftor tho last fluid particle has reachod tho Jot front a spherical vortox continuos propagating.

The drag on structures in its vicinity can bo bounded by using tho floM fiold from tho formula for $ abovo Mith U as tho pat front volocity from NEDE"2)730 at tiaa t t

0

Pago 13 NRC hCCEPTH)CE CAITERIh NUREG 0487 10 78)

LEAD PLhNT POSITION

{JULY 23 1979)

GENEAIC LONG TERN PROC BAH POSITION SUSQUEINNNh POQ ITIOt) 2.

SRV Quencher Jat Loads This load may bo neglocto4 for thoso structures located out-sido a xeno of influonco which is a sphoro circumscribed aroun4 tho quenchor arms.

If thoro aro holus in tho end

caps, tho radius of tho sphoro should bo incroased by 10 hole diamoturs.

{Confirmation during long term program required).

Tho P5.5 pressuro transducer data from tho T-quencher tost program prosontod ln Section 8.0 of tho Susque-hanna DhR shows no wator got affect thus no loads aro specified beyond a 5 ft. cylindrical sons of influence.

X-quonchur - hccspt NUREG 0487.

N/h, Thu P5.5 prcssure transducer Following load data from tho T-quencher plant/long term tost program prusunto4 in program.

Soctlon 8.0 of tho Susque-hanna DAR shows no wator fot offuct thus no loads aro specified buyon4 a 5 ft. cylindrical sons of influence, S.

LOCh/SRV her Bubble Drag Loads LOCh hir Bubble Loads Calculato based on tho analytical modol of tho bubble charging process and drag calculations of BEDE-21471 until tho bul>blas coaloscu.

hftar bubble contact, tho pool swell analytical modol, togothor with tho drag computation procuduro NEO-21471 shall bo used.

.Uuo of this methodology shall bo sub)oct to tho following constraints and modificationss

Pago 14 NRC ACCEPTANCB CRITERIA NUBEO 0487 10 78 LEAD PLANT POSITION JULY 23 1979)

OEllERIC LONG TERN PROGBAH POSITION SUSQUEUANNA POSITION a.

A consorvativo estisIate oC bubblo asyauatry shall bo added by incroasing accelerations and volo-citioa computed in stop 12 oC Section 2.2 of NEUE-21730 by 101. If tho altornato stops 5A, 12A and 13A aro uIIcd tho acculcration drag shall bo direct,ly increased by 10l whila the standard drag shall bc incrca>>od by 20%.

(a)

Accept NUBEG 0487 adgustaIents to drag.

(a)

Accept NUREG 0487 ad)usta>>Inta to drag.

Ropcrt scheduled for suboittal in April, 1980.

(a)

BEDE-21471 nathodology used to dctcneino bubble forma-tion with exception that tirac dependant drywcll prcssure history will bo ucad to define bubble prcssure.

Bubble to bc usc4 as source and a Green's function solution will bo used to ostablish tha velocity an4 acceleration fields.

b Ho4ifiad cocfCiclonts C l froeI accelerating flows as pruccntod in Kcnlagan a Carpenter and SariIkaya rafcrancus shall bo used with transverso forces included, or an upper bound of a factor of three tinea tha standard drag coefficients I.hall bc used Cor >>tructuros with no sharp corner>>

or with strcanwlsc die>>Insions at loast twice tha width, (b)

Identify acro appro-priate accoloration drag cooCCiciont traatnent than Cactor of 3 (b)

Identify nore appro-prlato accoloration drag cooCfioiont troatswInt than Cactor

~

oC 3 ~

(b)

Following loa4 plant/long tarxI prag raIa ~

Pago 15 HRC ACCEPTANCE CRITERIA (NUREG 0487 10 78)

LEAD PLANT POSITION (JULY 23 1979)

GENERIC LONG TERH PROGRAM POSITION SUSQUE1IAllHA POSITION o.

Tho equivalent uniform flow velocity and acceleration for any structure or struc-tural segment shall bo taken as tho maximum values "seen" by that strupturo not tho value at tho geometric center.

(c)

Demonstrate that (c) accoleration at center of structuro is tech-nically correct.

Demon-strate that error re-sulting in velocity at center vs maximum velocity is small an4 bounded by conservatism in velocity applied.

Thus simplifio4 DPFR apprcach is acceptable.

(c)

Following load plant/long term

, program.

Demonstrate that acceleration at center of structure is tech" nically correct.

Demon-strate that error re-sulting in velocity at conter vs maximum velocity is small and bounded by consorvatism in velocity applied.

Thus simplified DFFR approach is accoptablo.

d.

For structures that aro closor together than three characteristic dimensions of tho larger ono, either a detailed analysis of tho interference effects must be porformed or a consor-vativo multiplication oi accoleration and drag forces by a factor of four must bo performed.

(d)

Demonstrate that factor of 4 is not technically correct for standard drag.

Refer to quostion response to 020.70.

In-terfcrenco effect on acceleration drag will bo analyzed on a plant unique basis.

(d)

Demonstrate that factor of 4 is not technically correct for standard drag.

Refor to question response to 020.70.

In-terforenco effect on acceleration drag will bo analyxed on a plant uniquo basis.

(d)

Fbllcwing loa4 plant/long term program ~

e. If significant blockage from (o) downccmer bracing exists relative to tho net pool

area, tho standard drag coefficients shall bo modified by convontional methods (Pankhurst S

Holder referonco).

Demonstrate that (e) factor of 4 is not technically correct for standard drag.

Refer to question response to 020.70.

In-torferonce offect on acceloration drag will

'o analyxed on a plant uniquo basis.

Domonstrato that factor of 4 is not technically correct for standard drag.

Rofor to question response to 020,70.

In-torferonco effect on accoloration drag will bo analyxed on a plant unique basis.

(o)

Following lead plant/long torm program.

Pago 16 NRC ACCEPTANCE CBITERIh NUREG 0487 10 78)

C ~

Formula 2-23 of NEDE-21730 shall bo modified by replacing NN by PFDV Whore VA is obtaiIIod from shies 2-1 and 2-2.

LEAD PLANT POSITIOH (JULY 23 1979 (f)

Accept NUREG 0487 GENERIC LONG TERN PRQG RAN POSITION

{fl Accept NUREG 0487 SUSQUEllANHA POSITION

{C)

Accept NUREG 0487 2.

a, SRV ramahoad air bubble Accept NUREG 0487 loads Accept NUBEG 0487 N/h.

b, SBV quencher air bubble loads.

T-quencher - loads may bo computed on tho basis oC tho abovo ramuhoad method-ology using 25t uf tho calculated ramshoad bubble prcssure and assuming tho bubble to bu locatod at thu center o! tho qucnchur device having a bubblu radius equal to tho quencher radius.

Trencher bubblo location an4 sixo are plant uniquo.

Amplitude and frequency aro based on PP6L program, methodology from NEOE-21471-P is usod to apply load to structuros.

T-quencher submerged struo-load mothodology is pro-sentod in Susquehanna

OAR, Section 4.1.3.

Follouing long tera program.

X-quunchur - loads may bo computed on thu basis oC the above ram'hued mutho4-ology using Lubblo pressures calculato4 by tho muthods o! NEON-21061-P, Rov. 2, for tho X-quunchor X~uencher mothodology boing developed by Burns S

Roe, H/h,