The Quad Cities Units 1 and 2 have a history of steam line vibration issues. The implementation of an Extended Power Uprate resulted in significant increases in steam line vibration as well as acoustic loading of the steam dryers, which led to equipment failures and fatigue cracking of the dryers. This paper discusses the results of extensive data collection on the Quad Cities Unit 2 replacement dryer and the Main Steam Lines. This data was taken with the intent of identifying acoustic sources in the steam system. Review of the data confirmed that vortex shedding coupled column resonance in the relief and safety valve stub pipes were the principal sources of large magnitude acoustic loads in the main steam system. Modifications were developed in subscale testing to alter the acoustic properties of the valve standpipes and add acoustic damping to the system. The modifications developed and installed consisted of acoustic side branches that were attached to the Electromatic Relief Valve (ERV) and Main Steam Safety Valve (MSSV) attachment pipes. Subsequent post-modification testing was performed in plant to confirm the effectiveness of the modifications. The modifications have been demonstrated to reduce vibration loads at full Extended Power Uprate (EPU) conditions to levels below those at Original Licensed Thermal Power (OLTP).
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14th International Conference on Nuclear Engineering
July 17–20, 2006
Miami, Florida, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-4242-8
PROCEEDINGS PAPER
Quad Cities Unit 2 Main Steam Line Acoustic Source Identification and Load Reduction
Guy DeBoo,
Guy DeBoo
Exelon Nuclear Engineering Department
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Kevin Ramsden,
Kevin Ramsden
Exelon Nuclear Engineering Department
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Roman Gesior
Roman Gesior
Exelon Nuclear Engineering Department
Search for other works by this author on:
Guy DeBoo
Exelon Nuclear Engineering Department
Kevin Ramsden
Exelon Nuclear Engineering Department
Roman Gesior
Exelon Nuclear Engineering Department
Paper No:
ICONE14-89903, pp. 327-332; 6 pages
Published Online:
September 17, 2008
Citation
DeBoo, G, Ramsden, K, & Gesior, R. "Quad Cities Unit 2 Main Steam Line Acoustic Source Identification and Load Reduction." Proceedings of the 14th International Conference on Nuclear Engineering. Volume 1: Plant Operations, Maintenance and Life Cycle; Component Reliability and Materials Issues; Codes, Standards, Licensing and Regulatory Issues; Fuel Cycle and High Level Waste Management. Miami, Florida, USA. July 17–20, 2006. pp. 327-332. ASME. https://doi.org/10.1115/ICONE14-89903
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