Recorded test data are presented for Tests 1004 and 1006 of the isothermal portion of the Semiscale Blowdown and Emergency Core Cooling (ECC) Project. These data. represent the results of the first tests in the isothermal test series in which simulated ECC injection during blowdown was investigated. The data, presented in the form of composite graphs in engineering units, have been analyzed only t o the extent necessary t o .assure that they are reasonable and correct. The intent of this report is t o make available the uninterpreted data from Tests 1004 and 1006 for use by others and for support of subsequent interpretative reports and analyses.

Resistance and self-propulsion data are presented for Model 5048 fitted with tunnels equal in depth to basic propeller diameter. The relative merits of seven combina tions of LCG posi tion , propeller diame ter and trim tabs are disc ussed. A forward LCG pos iti on offe rs the bes t comb ina tion of draf t and shaf t power. Comparisons are also made wi th the sam e hull without tunnels and with two sets of shallow tunnels. The 100 percent tunnel is inferior to both shallower tunnels in draf t and power requirements , but it gives superior propel l e r pro tec tion for beach in g opera ti ons. The 65% tunnel requ ires the least draft and gives good propeller protection , but it requires more power than the 40% tunnel. ADMINIST RATIVE INFOR MATION This report was authorized and funded by the Naval Insh ore Warfare Craf t Off ice (Code 114) of the Sys tems Develop men t Depar tmen t , David W. Taylor Naval Ship R~D Cen ter , which prov ides Techn ical Man agemen t for the Naval I nshore Warfare Craf t P rogram , SSW-02 (previously the Special War fare Craft Program , S38-20X). The Pr in cipal Develop men t Acti vi ty is the Naval Sea Sys tem s Command wit h program mana gemen t in the Adv anced Te chnolo gy Sys tem s D ivisi on (SF~A 03221). Program funding is under element 6.3586 N. This specific task was funded under center work unit 1-1140-606. 1 J-______ __ UNIT S U .S. customary units were used for the ori ginal measurements and calcula tions. SI (Metric) equivalents of US units are given where they first occur in the text and elsewhere if required for clar ity. U .S. uni ts are used alone when their SI equivalents have prev iously been given an d where the un it pe rfor ms an adjec tival function , as in "6 inch propeller ". This usage has been adopted to facilitate cross-referencing between this and previous reports in the tunnel-hull series. The appended da ta tables , prepared bef ore the adop tion of SI units , have not been revised to incorporate SI equivalents due to time and cost constraints.

Recorded test data are presented for Tests 1008 and 1010 of the isothermal portion of the Semiscale Blowdown and Emergency Core Cooling (ECC) ,Project. These data represent the results of the first isothermal tests utilizing an enlarged downcomer gap (1.0 inch) in the pressure vessel to investigate general system hydraulic response both with and without simulated ECC injection. The data, presented in the form of composite graphs in engineering units, have been analyzed only t o the extent necessary to assure that they are reasonable and correct. The intent of this report is to make available the uninterpreted data from Tests 1008 and 1010 for use by others and for support of subsequent interpretive reports and analysis. ii.

No abstract

Gas-liquid countercurrent flow tests were performed as part of the Semiscale Blowdown and Emergency Core Cooling (ECC) Project. These tests included: (a) preliminary tests to establish the lower plenurn liquid levcl for subsequent tests and to investigate bypass flow phenomena; (b) steady state tests to investigate the relation between steam flow and ECC entrainment; and (c) transient tests to investigate the effect of steam generation and high wall heat flux on countercurrent flow behavior. The tests were conducted using the semiscale vessel, a phase separator, and a storage tank. Resl~lts are presented as dimensionless volumetric flux graphs, computer printout of digital data at discrete time intervals, and computer-produced graphs ot anal6g data as a function of time. Descriptions of the test facility, instrumentation, operating procedures, and test conditions are presented. Rlaximurr~ errors are identified .and an error analysis is presented for the volumetric flux presentations. The purpose of this document is to present the data with minimum interpretation for use by the nuclear community and for support of subscquent interpretative analyses.