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Pump head pressures, presented as ratio to nominal values, considered by design. 

Pump head pressures, presented as ratio to nominal values, considered by design. 

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Fig. 1. Flow into pump. 
Fig. 3. Intermediate Circuit generalized chart. 
Fig. 4. Pump head pressures, presented as ratio to nominal values,...
Fig. 5. Level in system tank, presented as ratio to nominal values,...
+5 Fig. 6. System flow rate, presented as ratio to nominal values,...
Implementation of Uncertainty Analysis in Evaluation of Small Disturbances
Conference Paper
Full-text available
  • May 2007
Efforts in KNPP led to launching of complex TOFT in 1995, where has been implemented recording and fast evaluation of large data-trends. Obtained source files consist of consecutive records: instrumentation channels output, recorded every minute for a period of 24 hours. TOFT was installed consequently on units 1 through 4, equipped with VVER-440/2...
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Context 1
... important for normal operation and to transfer it to the end heat removal system. IC consists of three pumps, supplied with corresponding isolating valves GV13.13 and check valves. 8 The pumps are in operation according to a plant schedule. One of the pumps No. 3, 1, 2 is always on, correspondingly for 3, 10, 7 days, in the analyzed case, Fig. 4, while the others wait in automated reservation. A generalized scheme of this system is presented on Fig. 3. It is drawn in accordance to Ref. 8. The numerous heat exchangers for primary heat removal, presented in Ovchinnikov et al, 8 are summarized to a generalized one, ENRP. Two heat exchangers, transferring heat to the end heat ...
Context 2
... IC is supplied with many sensors. On Fig. 3 are inserted only these, involved in current investigation. Three pressure sensors, PH1, PH2 and PH3 indicate head pump pressures. They show the moment of exact exchange of the pump in operation, Fig. 4. Each pump can be isolated from the system by valves GV13.13, always opened during normal operation. The special sensors of interest: for measuring of system pressure and volumetric flow, are positioned on a common ...
Context 3
... case is: behavior of system tank, B0, which level change is presented on Fig. 4. The decreasing of its level from 1.099 with ~0.22 for 13 days can be defined as event of primary type, according to classification, given in this paper. Because of organized leaks for cooling of pump shaft seals, 10 some amount of working fluid is removed. The level was restored manually to 0.987 by the operator as response to the ...