ENG 333 Communication for Science and Research
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Jamie Larsen, InstructorThe Babcock & Wilcox CompanyPower Generation GroupTo: Distribution From: J.J. Kelly, Plant Integration Subj: Customer Guidance on High Pressure Injection Operation Date: November 1, 1977 DistributionB.A. Karrasch Two recent events at the Toledo site have pointed out that perhaps we are not giving our customers enough guidance on the operation of the high pressure injection system. On September 24, 1977, after depressurizing due to a stuck open electromatic relief valve, high pressure injection was automatically initiated. The operator stopped HPI when pressurizer level began to recover, without regard to primary pressure. As a result, the transient continued on with boiling in the RCS, etc. In a similar occurrence on October 23, 1977, the operator bypassed high pressure injection to prevent initiation, even though reactor coolant system pressure went below the actuation point. Since there are accidents which require the continuous operation of the high pressure injection system, I wonder what guidance, if any, we should be giving to our customers on when they can safely shut the system down following an accident? I recommend the following guidelines be sent: a) Do not bypass or otherwise prevent the actuation of high/low pressure injection under any conditions except a normal, controlled plant shutdown. b) Once high/low pressure injection is initiated, do not stop it unless: Tave is stable or decreasing and pressurizer level is increasing and primary pressure is at least 1600 PSIG and increasing. I would appreciate your thoughts on this subject |
