The sodium content of saturated steam in operation process of unit no.1 in one power generation Co Ltd is somewhat higher

and has comparative large fluctuation

being likely to exceed the set standard.It is believed from analysis that the main causes leading to high sodium content in saturated steam of unit no.1 are:poor steam-water separating efficiency of the cyclone separater for the steam drum of boiler no.1

and few number of said separators

as well as mechanical matters carried in steam due to crack in the welded joints of the sealing sandwich on upper part of the drum

and unproper position of the continuous dischaging pipe

as well as having not fully selded in the weld seam at conjunction of drain tank with the drain pipe

etc..