Research Papers: Operations, Applications & Components

Thermomechanical Behavior of Pressure Tube Under Small Break Loss of Coolant Accident for PHWR

[+] Author and Article Information
Ashwini K. Yadav

e-mail: ashwinikumaryadav@gmail.com

Ravi Kumar

e-mail: ravikfme@iitr.ernet.in

Akhilesh Gupta

e-mail: akhilfme@iitr.ernet.in
Department of Mechanical and Industrial
Indian Institute of Technology,
Roorkee, Roorkee, 247667, India

B. Chatterjee

e-mail: barun@barc.gov.in

P. Majumdar

e-mail: pmajum@barc.gov.in

D. Mukhopadhyay

e-mail: dmukho@barc.gov.in
Reactor Safety Division,
Bhabha Atomic Research Centre,
Mumbai, 400085, India

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received July 16, 2012; final manuscript received May 13, 2013; published online June 11, 2013. Assoc. Editor: Somnath Chattopadhyay.

J. Pressure Vessel Technol 135(4), 041601 (Jun 11, 2013) (9 pages) Paper No: PVT-12-1098; doi: 10.1115/1.4024580 History: Received July 16, 2012; Revised May 13, 2013

Some postulated events for pressurized heavy water reactor (PHWR) small break loss of coolant accident (SBLOCA) may lead to flow stratification in the reactor channels. Such stratified flow causes a circumferential temperature gradient in the fuel bundle as well as in the surrounding pressure tube (PT). The present investigation has been performed to study the thermomechanical behavior of a PT under an asymmetric heat-up condition arising from flow stratification in a 19 pin fuel element simulator. A series of experiments has been carried out at various stratification levels and PT internal pressures. The asymmetrical heat-up creates a temperature difference of 400 °C across the diameter of the PT. At high temperature the internal pressure causes ballooning of the PT. With the stratification, ballooning is found to get initiated at top hot side of PT and further propagates unevenly over its periphery. Axially ballooning is found to get initiated from center and then propagates toward both the ends of the PT. This results in an axial temperature gradient on the PT in addition of circumferential gradient. For a pressure higher than 4.0 MPa, the integrity of PT is found to be lost due to the combined effect of circumferential and axial temperature gradient generated under uneven strain distribution.

Copyright © 2013 by ASME
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Fig. 1

Schematic of Indian PHWR reactor channel

Grahic Jump Location
Fig. 2

Schematic diagram of experimental set-up

Grahic Jump Location
Fig. 3

Details of 19 pin simulator in pressure tube

Grahic Jump Location
Fig. 4

Location of thermocouples

Grahic Jump Location
Fig. 5

Photograph of pressure tube profile-meter

Grahic Jump Location
Fig. 6

Transient temperature and deformation of PT at 1.0 MPa pressure

Grahic Jump Location
Fig. 7

Temperature profile over PT after 2300 s for 1.0 MPa pressure

Grahic Jump Location
Fig. 8

Transient temperature and deformation of PT at 2.0 MPa pressure

Grahic Jump Location
Fig. 9

Temperature profile over PT after 1300 s for 2.0 MPa pressure

Grahic Jump Location
Fig. 10

Transient temperature and deformation of PT at 4.0 MPa pressure

Grahic Jump Location
Fig. 11

Temperature profile over PT after 1400 s for 4.0 MPa pressure




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 Journal Articles
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