ML20209C925
Text
'
YU.
i ,
. g 3 .
ldlLLST L=
Distribution: JUN 2 71980 Central Files SFabic TLee CSB Reading JKudrick MDavid(GE)
NRR Reading PNorian BPatel (Creare)
UButler CAnderson LRubenstein JLehner(BNL)
KKniel EMcCauley (LLL)
Mr. E. Aust Project Leader GKSS Forschpngszentran Institute Fur Anlagentechnik Postfach 1160 2054 Gecsthacht Eadcral Republic of Germany
Dear !!r. Aust:
Thank you for your recent visit to the UStiRC and for~ the opportunity to discuss the data being obtained by GKSS fron the multivent test facility.
During our discussion, evidence collected from transducers located at the pool bottom for test !!2 (attachmnt 1) was presented to show that chugging at indi-vic*ual vents typically occurs in a time window of the order of 2 nsec. The tire of chug uns chesen as the tina of the man pressure following the maximun negative botton pressure.
The U. S. liark II Owners Group maintains that chugs at individual vents do nat occur at precisely the same time (the average time window within which chucs occur at individual vents is of the order of 20 msec). Their conclusion was based on data obtained from the Creare three-vent 1/10 and 1/6 scale tests.
The U. S. Ilark II Owners Group uses different criteria for phasing; specifically, vent static pressure instead of pool bottom pressure was chosen. Furthermore, time of chug was chosen as the time of the minimum preceding the maxinum in vent static pressure, when both the mininum and m3xinum occurred during the time vent was cleared of water (see attachments 2 and 3).
Uc are interestod in determining if there is a similarity between phasing ob-servations in the GKSS large scale and the Creare small scale tests. Thus, it would be of help to us if you would present the GKSS phasing obscrvations (on plots similcr to those in attachment 3) for several tests using the criteria, uentioned above, used by the fiark II Owners Group.
8702040369 870120
-702 PDR ihRO ,
DS :CSB DSI:CSB o,,,c . ,
DSI: g _ _DSI:C 9
.n.-* EEltawl a:f. .Mnde rs on.... ..JKudri . WButler _
o.v
- _.6/z7.].,80_ ..p./t.1/80 _ 6/ g /80 6/g/80 rm AIC 318 (Rev. 9 33) AICM 0240 W u. s. 4owsan-ant pointino orrsche ser..sas. tee -
6 g *-*
2- JUN 2 71980 He are also interested in acoustic reasurenants of the CKSS test facility.
The I; ark II Cuncrs Group has saade such rc.cature!'ients, by inferring pressure sensor readings at different locations in the pool, in the 4T single vent test facility. These necsurerents are to be included in their improved load iaethodology. He are interested in seeing how these measurenents vary froa facility to facility.
We are looking forward to continuing our good working relationship with you and your staff.
Sincerely,
/s/
F. Eltavila Containtacnt Systens Branch Division of Systens Integration Att:ch.aants:
As stated orrece e swamawa b ...
D4te > . . . . ..
3ren AEC.3le (Rev. 9 53) AFCM 0240 W u. s. noveamusar eneatene omens esta.sas.see