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ADhlSORY COMMITTEE ON REACTOR SAFEGUARDS UNITED STATES ATOMIC ENERGY COMMISSION WASHINGTON D.C. 20545 February 12, 1974 D. Okrent THEOFAN0US' COMMENTS ON GRAND GULF On February 5, 1974, I received a telephone call from Dr. Theofanous in which he identified the following list of items as still open to resolution:
A.
ECCS 1.
GETAB calculations for Grand Gulf 2.
Jet Pump data quality at the suction 3.
Inertia effects and asymmetries in the downcocer node 4.
Adequacy of long term model for water inventory 5.
System effects and modeling for short and long term models 6.
System effects for application of FLECHT data 7.
Significance of dissolved gases on lower plenum flashing 8.
Evaluation of design margins for blowdown forces on internals (acoustic decompression) 9.
Adequacy of the Moody model and current noding for break flow (possibility of the discharge coef ficient (c) being a function of time or c >1.0)
B.
Containment 1.
Adequacy of bloudown calculations for determining containment design criteria 2.
Adequacy of noding and added mass calculation for the vent c1 caring model 3.
Vent clearing for large scale tests do not compare as closely with predictions as do the staa11 scale tests 4.
There is very If trle f;Ldamental understanding of the initial air sweeping transient for the Mark III containment as well as all previous pressure suppression co.1tainments (Mark I and II) 5.
Quantification of splashing (also relevance of Swedish tests) 6.
Experimental information on pool stratification and effects on containment pressure N
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Flow regimes at injection points (vents and relief valve discharge) 8.
Experimental 1'and theoretical information on loadings due to pool splashing Dr. Theofanous plans to visit GE and discuss these matters prior to the March 4,1974 meeting of the Grand Gulf Subcommittee.
Cf'-
J. C. Mc niey i
Senior Staff Ass tant cc: ACRS Members T. Theofanous 6
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