Abstract
The objective of this paper is to present the current organization of the Emergency Procedures including Emergency Operating Procedures (EOP) and Severe Accident Management Guidelines (SAMG) in Kozloduy Nuclear Power Plant (KNPP) as a function of the severity of the accident conditions. Special attention is paid to SAMG. It is described when the SAMG are used and at which conditions in a transition between the EOPs and the SAMG should be made. The Critical Safety Function Restoration Guidelines and their connections with SAMGs and EOPs are also discussed. The arrangement of SAMG is described in detail, since in the KNPP exist 2 types of SAMGs for Main Control Room (MCR) and for the Accident Management Centre (AMC) and they contain the same strategies, but they are different in format. Both types are symptom oriented procedures, but those for MCR are in 2-column-format with interconnections, whereas those for the AMC are developed in a logical manner and simplified for people, who take decisions. In the paper, they are also discussed the adopted strategies in existing SAMG that should be followed to recover from a damaged core condition and to prevent or mitigate the release of fission products. In the paper, they are also described a number of technical measures for management and mitigation of severe accidents, which are implemented in KNPP before and after the Fukushima accident. Many of them are common for WWER-1000 type of reactors, but some of them are unique and plant specific. This information can be useful for operators of other WWER type reactors or even PWR reactors.
Highlights
The issues about management and mitigation of severe accidents had been considered after the accidents inHow to cite this paper: Groudev, P., Andreeva, M., Mladenova, S. and Topalov, T. (2016) Status of Severe Accident Management Guidelines at Kozloduy Nuclear Power Plant
The objective of this paper is to present the current organization of the Emergency Operating Procedures (EOP) and Severe Accident Management Guidelines (SAMG) in Kozloduy Nuclear Power Plant (KNPP) as a function of the severity of the accident conditions
EOPs analyses are designed to provide the response of monitored plant parameters to identify symptoms available to the operators, timing of the loss of critical safety functions and timing of operator actions to avoid the loss of critical safety functions or core damage
Summary
How to cite this paper: Groudev, P., Andreeva, M., Mladenova, S. and Topalov, T. (2016) Status of Severe Accident Management Guidelines at Kozloduy Nuclear Power Plant. (2016) Status of Severe Accident Management Guidelines at Kozloduy Nuclear Power Plant. The objective of this paper is to present the current organization of the EOP and SAMG in KNPP as a function of the severity of the accident conditions. During the development of SB EOPs at KNPP, a number of thermal-hydraulic analyses for KNPP have been performed at the Institute for Nuclear Research and Nuclear Energy-Bulgarian Academy of Sciences (INRNE-BAS) using RELAP5/MOD3.2 computer code [2]-[6]. IAEA requirements related to safety and operating organizations for NPP are mainly contained in the [11]-[15]. Safety requirements for accident management in Bulgaria are contained in the [16]-[18]
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