ML20212L356
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e NL n]Ly e OCT 2 21976
'!OGANDLE FOR: Robert L. '!Wiesco, Assistant Dirnu.
for Plant Syste s Division of Systsu Safety FIE: L. 81aryers Analysis Demicprunt Brand
'!HPU: S. Fabic, Chief Jnalysis Develogrant Branch Original signed by.
L. s. 'Itruy, Assistant Dirw^A- L S. Tong for w anactor safety M St.11JBCr: SCM9JE & MMNIIGN 'DC MEETING & OCIT!T 5,1976 Stamary:
'Ibe meting took place in S^Mlebr. Mr. Slat 3h terbed of INE1, who is t.=wa rily assigned to the poject, was designated as NTC ipw..tative with instructions frm thin office. At this meeting the m.w.sdations nede by the 'sc to the project were as follows.
- 1. At the time of the meting all blowdowns adwduled for the Marviken II project had bcum piu.fvu o1. Since the preg u was underspet an extra blowdown ?!r 25 has been ym,uried by the project to be parformed in the h4 half of Octcter 1976.
I l 2. 'Ihe " Single cell ocnoept will be used in biculown far 25.
'ihis entails installing a cylindrical barrier around the reference t vet outside the partition as was suggested by the Cezenn representatives.
- 3. Bicudown 25 like the two previous tests will be perfcanmd with an initially high breakflow follcwd by a low maec flow period tcward the tail-off of the blowdown. Turino this phase a transient in specific mass flow thrtuyh tie wnts of 100 to 10 kgAn2s is obtained by means of controlling a valve at the l
l break location.
- 4. Blow $own 25 will have a deeper sdrezgence of 3.80 m (ncrninal sutzvrgence is 2.90 m) .
I 5. Blowdown 25 will have 2 of the 4 large vent channels blocked as i
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OCT 2 21976 Di n amions:
In the last three tests the cingging phase toward the ord of the blowdom has been incitaSed. In these tests the blowdown is controlled by means of valves startirg at high flow rate which, toward the ord of the transient, are IMM by mams of closirs the valve e nlly. Ttus the tests still duplicate the originally planned ness flowrates, even grepurginJ, but in aidition simlate the tail-off of .
the h1W with relatively pure statsu flow. *!his test canditim _ -
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was rWJ by the W. German repreewitative but is of interest to the NIC as well. It therefore was surparted fcr ice b=4m in those tests. ,
A further test feature puiw by the W. German rugresentative was -
to install a separate cylindrical partition arcurd a single vent.
This test is to be parfacasd in conjunctico with a test where a group of 29 dowr-- +s is enclosed in a sesparata pool partion, the remaininJ 28 being closed off. A test of this kind is of interest since it providels a direct conmarisco betseen sirugle an! mitiple vent aparation under idenHm1 flow conditions. The project has i incorporated this feature by means of insullirn a cylinder of 0.9 m dimeter canonntrim11y arcurd the reference vent. This cylinder antards verHm11y upward to 5 m below the original water surface.
j A cimarance of 5 m between the base of the cylirder and the bottom
! of the wet well trovidas for recirculaticn of the water in cylinder l in order to maintain a uniform taperature between the cylindse ard the rest of the tool on the one side of the partitim. .
The relicactive tracer meas 2rnent in the vent chanmla is not planned for blowdown 25. This decision came about due to a septrate acresnent betwnen the Troject manngawit and TK managnunt. Saveral TPC r.wrbers, especially the German member were rot in agreement with this decision ard, plan to refer the matter to tle project bcard far consideration at their meetinJ on October 20, 1976.
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