4.2 Test Preparation, Shipboard Numerous modifications have been meade of the two Liberty ships in order to approximate certain combat vessel construction. of these modifications are: <xamples a) addition of a flight deck section b) installation of 2 - 3 in. guns (inoperative) c) installation of forced draft intake ducts for the boilers d) installation of typical ventilation systems e) installation of steel sections to simulate armored deck. Instruments and equipment to be used in the test will be installed as soon as precticable. Special test surfaces, the washdown system, and general instrumentation will be installed by Mare Island Naval Shipyard. An aircraft will be located and secured on the No. 5 hatch of each ship, and the other aircraft will be loaded on each ship for transportation to the site. Technical photographic equipment will be installed on the main deck of Baker inthe deck house. During dock trials, Pitot traverses will be taken at selected points in the boiler-air and ventilation systems, and air samplers and particle collectors will be operated and tested. An air-nonitoiing instrument will be located and secured aboard each test ship while in the San Francisco area, with power turned on to insure correct operation. Location of construction material panels and fallout equipment will be determined, aii panels and racks installed. Sampling devices and electrical service lines of Project 2.5b will be installed, and protective coatings will be applied to panels and paint frames. Ten special monitors furnished from the crews of the YuGts 39 and 40 will be given additional specialized radiological safety training. As part of the general indoctrination of survey persomel, specific monitoring survey techniques and monitoring check points will be estab- lished to expedite the survey operations after shot. ST. LOUIS FRC During sea trials, the equipment and procedures for each subproject will be tested. Exhaustive tests will be made on decontamination equipment and supvortins facilities. ilen from crews of Able and Baker, permanently assigned to decontamination studies, will be trained in the use and operation of decontamination equi:ment and in decontamination techniques. The aircraft on Noe 5 hatch of each ship will be checked during trials of the washdovm system. “later coverage will be documented, and the washdown system will be modified if necessary. Air samplers, gemma recorders, nozzles, air monitoring instruments, portable radiation detectors, decontamination units, camera, and other test equipment will be opcrated and/or checked for proper performance. Fersonnel will rehearse the verious operations towhich they have been assigned. <Any experimental or other work left uncompleted at the time of departure of the ships for the test site must be completed aboard ship prior to arrival at the site. oo9s21 nee ZZ