ML20213D033
| ML20213D033 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point, Susquehanna, Columbia, Limerick, LaSalle, 05000000, Zimmer, Shoreham, Bailly |
| Issue date: | 08/22/1979 |
| From: | Anderson C Office of Nuclear Reactor Regulation |
| To: | Hanauer S Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0283, CON-WNP-283, REF-GTECI-A-08, REF-GTECI-A-39, REF-GTECI-CO, TASK-A-08, TASK-A-39, TASK-A-8, TASK-OR NUDOCS 7910010211 | |
| Download: ML20213D033 (6) | |
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AUG 2 21973 Generic Task A-3 t, A-39
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Docket l*os.:
50-358,50-352/3S
<0-367, 50-373/374, 50-337/333, 50-410, 50-322, v-39) 50 APPLICMT:
l'ca'aers of f* ark II 0.mcrs Group l:El' ORA'iD0:1 F0't:
S. h. !!anauer, Director, 'Jnresolvad Safety Issues
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Progra::', f:RR ff:0:f:
C. J. Anderson, A-3 Task Manager, Containment Systeus Granch, DSS St!? JECT:
hEETI':3 UIT:1 l'ARr. II 0'DERS G10!)P TO DISCUSS LO' G TER:1 PROGP.AI! TAS!'S (J'JLY 17,13,,1979)
Cach.;rcund The purpose of th'is uceting was to discuss the technical details related ta l
two ongoing tasks included in the ark II Ouners Lc.ng Tore Frogra". Thasa tasks include the r'ultivent steam testing pror, rara conlucted at Credre end the ::ee! tal ir. proved chuj load definition progrcm. Substantial pro ress has been.ude in recent acnths in cach of these tasks. This c_stinj pre.f R i the staff an opportunity to hecp ahecast of dcvelopments in these procrats i
and to provide co.: cents regardiag program direction prior to co:cletica of each progran.
An attendance list and a copy of the recting handouts are enclosed.
Sumary F
A suri.ury of the significant issues related to the :ultivent test program
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and the irproved chug load progran that vare Jiscussed in this cectin] are provided fielow.
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Creare :'ultivent Test Procram tir. :Mrtin of Cencral Electric provided an over ieu of this prograu.
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also discussed the role of the Creare rultivent tests in th r ; ark II Long Tera Prograr. The prit:ery purposa of these tests is to cnnfien, f
the conservative r.ature of chugjing leads dat ived froa the 4T sin;1e
!g vent test facility. This util be done P.y demonstrating a rcultivent
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v S. H. Hanacer AUG 2 21979
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Phase 1 of the Creare roultivent tests has been coupleted. This includes -
I nsitivent tests at 1/10 and 1/6 scale with 1, 3, 7 and 1, 3 vents n.
v t i. 'j, i ' O.a tnt facilitier.
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ratio was maintained in these tests. The tests were conducted over a rance of parameters including pressure, rass flux, pool temperature and vent air. content. The range of para:r.eters was determined by various scaling pro-edures.
In addition to the nultivent tests, tests ucre conducted to investigate 'the effects; of varying dryuell volumes, vent offset, a,d the pool to vent area ratio.
The results of the Phase 1 tests are to be for.aally docucented in a GE report scheduled for Sapte:.6cr,1979.
Phase 2 of the Creare tests are still in projress. These tests include single vcat tests at 1/4 and S/12 scale and additional n11t.ivent tests in the 1/10 and 1/6 scale facility. Recent additions to the Phase 2 tests are several single vent tests with varying dounce..er luncths.
The Phase 2 tests are scheduled for cocpletion in Oece:,:bcr,1979 with a fornal report scheduled for April,19CO.
Mi. Patel of Creare cade a presentation of the preliminary observations associated uith the Phase 1 tests. Results of the single and f.altivent tests at 1/10 and 1/6 scale ucre presented. This included a pecsentation of variations in the loads ragnitude and frequency a.s a function of the parar.eters; pool temperature, vent inass flux, vent air centent and dryuell volucc. Soue of the core significant observations by dr. Patel included tha followin3
- 6 single vent tasts conducted under the saue conditicas shcued ccod repeatability of the r/can peak over pressurcs.
- Strong similaritics exist betucan 1/10 scale sin]le and r.ultivent Ical trends with variations in stea a pass flux, pool tec.peratures, l
air content and dry.ecil volure.
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- Multivent pool wall pressures are louer than' single vent pool uall l
l pressurcs, i.e., a ualtivant,,.sltiplier less than unity was observed.
The cultivent cultiplier uas shoun to decrease with increasing i
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nunbers of' vents.
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- Strong /si:.,ilaritics exist.betueen r.ultivent 1/10 and 1/6 scale lead tranJs uith variaticas in steam rass flux, pool te.meratures, I
air content and dryuell volu:.:c. The load distribution at 1/10
,an1 1/G scales are almost identical.
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- Phasing information derived fro the 1/6 scale 3 "ent tests sho n stly
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'singic chug events at lou steam nass finx anj restly sinultanwas 3 "ont
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At the conclusion' of the present'ations of the Creare test 'esults, r
the filtC staff r.ade the follouing recarks:
- Ti$c Creare tests app'eai to be of value in that a significant volu:.e of quality experiyantal' data is now available to enable the study l
' of the effects on chugging of scale, raultiple vents, staa:a trass.
. flux, air content and pool te..porature.
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- The ultit.' ate value of the Creare tests dcpcods to a larga extent cn the final objectives of the tests. These ohjactives have changed over the course of the prograra. The value of these tests at this point. He.tever, these tests do appear to confira a r..ultivent to confira the pecpesed rultivent hydrodynanic nodel is questionable i.:altiplier of less than one.
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- A further study shculd be rade of FSI effects in the Creare test l
facility.
It is difficult at this point to accurately separate load trends due to FSI effccts frca other load trends.
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- The staff-has reco:= ended that assurptions. utilized in the chugging lead icpreverent prograa he supportcJ by additicnal experir.:catal data. The Creare test data should be studied to deterv.ine if these tests can be used as a part of this confir:caticn process.
- The Creare tests are proving useful in the studying uf chugging phenonana.
The Mark II cuners shculd consider the use of this facility to study the ph2ne: ena of condensation oscillation in Mar. II facilities.
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2.
Iuproved Chug Load Definition Progran I
l The !! ark II 0.>ners provided a status report of their Phase 2 Improved Chug Lead Definition Program. This pro] ram forms the principal basis l
for a reductico in the lead plant chugging related pool boundary loads.
,1, The lead plant chugging load spccification consists of, the application of a conservatively selected tine dependent pressure, signal extracted from the JT pool boundary to the Mark II ccotaircent structure.
i, li Studies ccnducted by the Park II ciners indicate that this lead plant percedure is very consr.rvative, sinca a significant portion cf the load specification results frca fluid structure interacticns in the 4T facility. The objcctive cf the 1:. proved chug load definitica prograu is to extract a chug scurce fec:.' the 4T data that is a conservative.
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Mr. Ashley of Cochtel described analytical studies of t'it JT 9cility to inf::r a chu ging svurce 'Nse applicatica at the cad of the 4T vent would yield 4T boundary pressure signals characteristic of those observed during the tests.
i The studies consisted of an evaluation of the 4T data base and development of an acoustic model of the 4T facility.
The 4T I
data base evaluation consisted of categorization of the 137 boundary pressure histories cogriding the chugging library into 4 cateccries of i
chug signals.
The characteristics of each chug category were studied so J
,as to provi.de insight r,ogarding the vent cource spccification.
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An acoustic nodel, IWEGS, uas developed for the 4T facility.
consists of a closed fora colution of the ?!avier-Stches fluid equations h
The codel of icot. ion with a rutber of siuplifying assuuptions. A separate l'TGS p
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- .:cdel uas developed for thu 4T vent and the pcol. A volu.utric cource uas applied to the vent.
This source uas inferred fec:a observatiens d
froa the 4T tests.
Application of this'saurce to the vent yieldcd a y
pressure history at the exit of the vent.
The vent volu. metric source function and the pressure history at the end of the vont ucru applied to the IDEGS codel of the pool.
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Using the above procedure, 4T bcundary y
pressure histeries and pawer spectral densities ucre obtained, thich ucre characteristic of the significant chug events cbserved during the 4T tests (i.e., classical and sinusoidal chug events).
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"r. Fitch of the Park II owners described a peccedure for the develeprant of a conservative chugging source dafinition. Cath a syrr.etric and an asy:=etric specification were deveinped. The sy:wetric load spccification was inferred fec.a pre 2ure traces at the l'ottaa of the 4T facility.
This uas done by-developing a single pc'sar spectral density (PS2) uhich i
onveloped the PSD's observed in the 131 chugs conprising the 4T library of chugs.
A vent forcing function was assurad that yicided the bounding PSD uhen applied to the I' EGS todel of the 4T facility.
1 A cultiverit acoustic model INEGS/M.*dS. uas developed for Itark II centain. ents sir.:llar to the I'.-!EGS podel of the 4T facility. Pool boundary loads for liark 11 plants are to be obtained frca the IPEGS/ MARS nodal of the con-g tainment using the conservative source specification derived fre.a the I'!EGS analysis of the 4T facility.
1 l'r. I'cFarland of General Electric describad the results of' a study of i
.a typical liark II plant uherein the plant was evaluated separately by the 1 cad plant bounding chug lead and the fi: graved ci ug load specification.
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This study indicated a significant reductico in the containi. ant res, tense using the icproved chug specification in contrast to the original bcu ding
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chug specification.
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AUG 2 21979 3.t '.!'; ;;.. l. i un of L.c g._;... A r. i va J i i e prop specification the flP,C staff c'ade the folloutng coments:osed improved chug load
- The average pcuer spectral density of the 4T design PSD is nct bounding for these high frequencies.
the 4T high frequency respcuse sh7uld be The presence of dater:ained that the high frequency respon. explained. Should it be se is real the de shculd be adjusted to include the high frequency response. sign PSD
- The staff avaits verificatien of assumpticas in the 4T-IWCS and the studies of the 4T and itark II containnent.fark II-ICEGS/n/d5
- The~ design PSD cas based on a library of 137 chues selected frca C00 chugs ebserved ia the 4T tests.
Tha !! ark 11 cuners should study the recaining 4T chucs, to detur.line if their inclusion uculd substantial modify the design pSD.
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- The it. proved chug lead todal prccedure shculd be confirned b'y 1
j applications of the codel to other related stcam tests.
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- Application or the cadel to the 4T fccility resulted in a reduction of l
j the Loundary lead frca 9 psi to about 3 psi.
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- I previded for this lead reduction.
shculd be discussed.
Centributions to this load reduction
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- lisc cf an enveloping pc ter spectral density versus h[
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- Sounder arcurents, than these presanted, shculd ba given to justify the statistical analysis of the 4T data to arrive at a conservativa scurce s;;ect fication.
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- The available r.ultivent test data should be studied to verify the d
statistical averaging of the 4T data.
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4.s of tha d tects. Sensitivity studies sht,uld !>e perfun.:ed to assess the affect of the~ darping paraccter.
Clifford Anderson, A-8 Task Mcnacer Containnent Syste:..s Cranch Division of Systens Safety l
Enclosure:
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