Estimation of the effect of distorted wall condensation of ROSA/AP600 performance

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:100675

Ortiz, M G; Lenglade, C E ^[1]

---

1. Idaho National Engineering Lab., Idaho Falls, ID (United States). Dept. of Engineering Research and Applications

The Large Scale Test Facility of the Japan Atomic Energy Research Institute was selected by the U.S. Nuclear Regulatory Commission to, after suitable modifications, conduct confirmatory testing of the Westinghouse AP600 design. Like all scaled facilities, LSTF has numerous potential sources of scaling distortions. Because of its Full-Height Full-Pressure and power-to-volume scaling design philosophy, vertical surfaces in a modified LSTF are larger than ideal. Such is the case of the Core Makeup Tanks, which in the AP600 design have the double function of providing full pressure coolant to the core. While simultaneously controlling the operation of the Automatic Depressurization System valves that accelerate the depressurization of the primary system. As the CMT drains, steam enters it from the top; the CMT`s liquid level is detected and it triggers the opening of the ADS valves. CMTs, ADS, and their associated logic have been incorporated into the modified LSTF to capture this aspect of AP600 performance. The question that motivated this effort is whether the excessive wall area, available to the steam entering the top of the CMT, can cause excess condensation and significantly distort system performance. A series of sensitivity calculations and engineering analysis were conducted to evaluate this effect. The results indicate that although an effect can be expected, its significance dies out as the transient progresses.

• DOE Contract Number: AC07-76ID01570
• OSTI ID: 100675
• Report Number(s): CONF-941142--; ISBN 0-7918-1433-5
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
22 GENERAL STUDIES OF NUCLEAR REACTORS
FUNCTIONAL MODELS
NUCLEAR FACILITIES
PWR TYPE REACTORS
SCALE MODELS
SCALING LAWS
SENSITIVITY ANALYSIS