atw - International Journal for Nuclear Power | 02.2020

atw Vol. 65 (2020) | Issue 2 ı February
ENVIRONMENT AND SAFETY 90
NSC
level
Assignment
range
Vector value
(V i )
Main characteristics
of the organization
1 [0, 50) 25 Individuals at all levels in the organization lack nuclear safety awareness, and their safety
behaviors are based on their own instinctive reactions.
2 [50, 60) 55 The source power on nuclear safety mainly comes from the requirements of regulators and
superiors. Individuals believe that nuclear safety is the responsibility of the leaders.
3 [60, 70) 65 The management has a certain understanding of the importance of nuclear safety, the
organization has defined the nuclear safety responsibilities and authority of individuals at
all levels, and enhances individuals’ nuclear safety awareness by improving the quality of
procedures and organizing training.
4 [70, 80) 75 Individuals understand their nuclear safety responsibilities and actively improve their safety
skills and safety awareness. Most line employees are willing to work with management to
improve and enhance the NSC.
5 [80, 90) 85 The organization recognizes nuclear safety as a collective responsibility, focusing on communication,
recognizing the value of all individuals, and recognizing that respect for employees
is important for nuclear safety. Free flow of information in the organization, management
level and employees work together to improve the NSC.
6 [90, 95) 92 Individuals at all levels in the organization have a strong NSC concept, basically forming a
team value with nuclear safety is emphasized over competing priorities, and continuously
improving the NSC level through continuous learning, training, and self-improvement.
7 [95, 100] 97 The organization has reached a highly self-disciplined NSC level. The NSC concept has been
integrated into every employee in the organization. The organization is full of trust and
respect. From management level to individuals, it pays close attention to nuclear safety.
NSC stage
Instinctive
reaction
Passive
management
Active
management
Employee
participation
Team mutual
assistance
Continuous
improvement
Highly
self-discipline
| Tab. 3.
Nuclear Safety Culture Level Comparison Table.
assistance stage, continuous improvement
stage and high self- discipline
stage, Table 3 shows the nuclear safety
culture level com parison.
In addition to the main features
and stages, the assignment range and
vector value of each nuclear safety
culture level are also included, and
these two types of data are mainly
determined based on the experience
of the expert group.
4.2 A quantitative evaluation
method of nuclear safety
culture based on BP neural
network
BP neural network is a multilayer feed
forward network, which is trained
according to the error back propagation
algorithm style, it was found that
the BP neural network can learn and
store a large number of I/O mapping
relations, without prior mathematical
equation describing the mapping
relations, and it is very suitable for
processing a non-linear information
processing requirements [18]. The
topology structure of BP neural
network model includes input layer,
hidden layer and output layer, as
shown in Figure 3.
According to the characteristics of
the BP neural network, the design
process of the NSC quantitative rating
| Fig. 3.
The topology structure of BP neural network model.
| Fig. 5.
BP neural network error curve.
| Fig. 4.
Algorithm flow chart of NSC quantization neural network.
Environment and Safety
Research and Application of Nuclear Safety Culture Improvement Management for NPPs in China ı Xiaozhao Xu, Jun Guo and Sujia Li