Document VrNvbdbZYeE0OdBXoZe67pjw

(conoco) Interoffice Communication to Bob Seymour From Don Johnson o.te Subject April 15, 1975 VC Release from D-300 On April l4, D-300 ms charged with a 5305 formula which calls for a running temperature of 150 degrees F. This in turn causes the * .reactor pressure to run at approximately 150 psig. The realtor (D-300) had just reached 150 degrees F. on run temperature when the 4" safety disc under the relief valve blew. Pressure at that time was indicating l48 psig. The relief valve which should have been set at 185 psig lifted for approximately 4 to 5 minutes then reseated. Wind was blowing from the East at the time of venting. I estimate that approximately 4 to 5,000 lbs. of VCM was lost. The continuous monitors were checked in the large reactor area agd in the lab and no indication was given of any excess ppm VCM in the areas. For this reason, this was not considered a VCM emergency. cc: JWP FMW / DTH 000087253