A pressurized water reactor includes a cylindrical pressure vessel defining a sealed volume, a nuclear reactor core disposed in a lower portion of the cylindrical pressure vessel, one or more control rod drive mechanisms disposed in the cylindrical pressure vessel above the nuclear reactor core, and an annular steam generator surrounding the nuclear reactor core and the CRDM. 2 mole percent chloropentafluoroethane based on the total moles of halogenated hydrocarbons in the product mixture. Therefore, even when the earth pressure becomes large, the work will not be affected. A pan motor is attached to the pan frame and adapted to pivot the pan frame about a pan axis relative to the support hub. The active pillar includes a lower dopant region, a channel region having a first sidewall and an upper dopant region vertically stacked on the buried bit line. The second heat conduction film may either be on the first heat conduction film or, alternatively, the first heat conduction film may be non-contiguous and the second heat conduction film may be interposed between portions of the non-contiguous first heat conduction film.