Aiming at the importance of pit work,combined with engineering practice,the generation reasons of common pit accidents were analyzed from exploration,design,construction and monitoring,and corresponding treating measures were proposed so as to complete excavation construction technology and avoid pit instability accidents,therefore guaranteed engineering construction running smoothly.

Through the screening and dynamic simulation of the instable fault,measures to restrict instability are presented,the composition and optimization of these measures in faults are introduced.

Stability-related accidents of ships could lead to disastrous consequences.

It is the gist of accidents managing and the important basis for safety management to analyze and evaluate the accident loss.

In this paper the main content is the analysis of the information asymmetry of the accident loss and the several incidents asymmetric types are summed up in order to make better of the analysis of the accident loss.

PWR LOCA Analysis with Condensation Reflux Model;

Simulation of LOCA in the auxiliary primary loop system of nuclear power plant;

Realistic Analysis of Intermediate and Small LOCA;

Loss of coolant accident is considered as design basis accident in the design of nuclear power plant.

The momentum integral method is applied in the frame of safety analysis of pressure water reactors under hypothetical loss of coolant accident(LOCA) conditions to simulate numerically film condensation, rewetting and vaporization on the inner surface of a pressure water reactor containment.

To evaluate the safety characteristics of pulsed reactor under LOCA (loss of coolant accident), an analytical model of LOCA is developed and an advanced code XPRLOCA with friendly interactive interface and real time simulation function is coded for simulating LOCA.