0

Full Content is available to subscribers

Subscribe/Learn More  >

Numerical Simulation of Pressure Transients in a PWR Main Steam Line System Due to Quick Operations of Pressure Relief Valve

[+] Author Affiliations
Jong Chull Jo

Korea Institute of Nuclear Safety, Daejeon, Korea

Paper No. PVP2009-77410, pp. 35-43; 9 pages
doi:10.1115/PVP2009-77410
From:
  • ASME 2009 Pressure Vessels and Piping Conference
  • Volume 4: Fluid-Structure Interaction
  • Prague, Czech Republic, July 26–30, 2009
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4367-3 | eISBN: 978-0-7918-3854-9
  • Copyright © 2009 by ASME

abstract

At a PWR (pressurized water reactor) nuclear power plant in Korea which was under being retrieved from the zero reactor power after a periodic overhaul in 2005, manual operation for opening the PORV (power operated pressure relief valve) was tried at a low speed to reduce pressure in the MSL (main steam line). Initially, one MSIV (main steam isolation valve) and five MSSVs (main steam safety valves) installed to the MSL remained all closed. To speed up the pressure reduction, the reactor operator in charge abruptly switched the operation mode from “Manual” to “Auto.” Just after the valve was opened fully in a very short time, rapid reduction of pressure in the MSL occurred. A little later on, the operator closed the valve quickly to mitigate the unexpected transient occurrence. In consequence of the result of the sudden discharge of high pressure steam to the atmosphere through the PORV, a curved pipe spool in the downstream was separated from both connections and blasted away into air. Then it collided with the outer wall of the RWST (refueling water storage tank) located about 50 m away, resulting in mechanical damage on it with the maximum permanent deformation of about 60 mm in the radial direction at a local part of wall. This paper describes a numerical simulation of the transient pressure responses to the quick opening and subsequent closing operations of the PORV on the PWR MSL initially maintained as a closed system at a high pressure, which has been performed to illustrate the incident scenario as well as to demonstrate its root cause. For computational efficiency, the pressure field to be solved has been modeled with a two-dimensional mathematical formulation. As the result, the simulation has shown realistically how the incident was initiated and developed.

Copyright © 2009 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In