ML19256D234
| ML19256D234 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/24/1967 |
| From: | Burley G US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Long C US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7910170740 | |
| Download: ML19256D234 (1) | |
Text
_.
v
,~
P00R ORGINAL Charles C. Long, Chief Reactor Project Branch f3, DRL July 24, 1967 THRU: Richard C, DeYoung, Chief 9 Contmimment & Component Technology Branch, PIL Gordon Burley G Distribution Comemi-t & Component Technology Branch, DEL Suppl.
DRL Readng METROPOLITAB EDISON - THREE MILE ISLAND - EESF(BISE ADRT Reading TO REQUEST OF JULY 10, 1967 - ITEN 2.4 C&CTB Reading C' 3"#1*7
' [0' C&CT3 DEL:GB IT-89 Insufficient experimental information is av=41=hle at present to give a definitive answer en the effectiveness of thiosulfata spray system as a fission product iodine removal =achm=4==.
Only a speculative assuer to the question can be given at this time.
Most of the information suggesting that iodine removal by sprays may be feasikle is based en theoretical papers by Y. Griffiths (AESB(a) 1 45-1963) and by A. E. J. Eggleton (Arn - E 4887 - 1967), both of the Waited Kingdom Ar==1e Energy Anthority. No experimental work
- mader simulated accident canditimes has been performed to data to verify the theory. A samber of laboratory scala experiments using both sodium thiosulfate sad hydrasses have indicated, heuever, that this may he a feasible method of removing inorganic molecular iodine from the
)
vapor phase. The removal of iodine associated with particulata matter er of ergsmic iodides, which may constitute a large fraction of the total iodine inventory release, has not yet been shown to be very effee-tive by this technique. Westinghouse, on July 12,'1967, presented to DEL a samnary of their results em the chamei=1 and thermal stability of sodium thiosulfate solutions as well as their analysis of corrosion tests. In the presence of oxylen a pH of 9 er higher, obtained by the addition of 0.15 molar sodium kvdrocida, is required to prevent rapid loss of iodina reduction capability. An independent corroberation of their findings by a disinterestad laboratory would appear to be highly desirable. Several weeks previous to this, ORNL presented to DEL their proposal for a major experimental effort to datarmine the removal capa-bility of cone =4== ant spray additives for halogen removal. This project 1
is just acw in its initial states and no really definitive answers can be expected for perhaps est. year. The work at other laboratories, asperi=11y BNUL, is at a similar stage.
The ce2cissima ese necessarily ea===
to at this stage is that sodina thiosulfate as an additive to containment sprays holds promise as a mechan 4== for reroving the molecular iudine from the gas phase follow-ing a design basis accidant. Steam condensation on the drop surface.
- =ramplete =iving, etc., may considerably diminish the theoretical effi-k e4mmew.
Tha
===awm1 canah414tw frar arennie indiden and nartien1 mesa-lated molecular 151=e r===d== to'be demonstrated. '
pg
.C&CTB/pur e trIa4DnL.
. h. -
..COUr1 E ----
SURN%4 >
\\
DATE >
_ --2]24] 2.2 7/1 [62_ -
MDC-818 t Rev. 9-43) ummm m apme