Development of advanced CRDM without canopy seal welds

Leakage of primary coolant from the canopy seal welds of control rod drive mechanism (CRDM) for PWR has been reported not only in Japan but also all over the world since the 1970s. The canopy seal weld is a circular weld designed to retain the pressure of reactor coolant while the strength of joints...

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Veröffentlicht in:	Nuclear engineering and design 2002-05, Vol.214 (1), p.25-34
Hauptverfasser:	Takanabe, Kiyoshi, Miyake, Takashi, Nagura, Yasumi
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Control rods Coolants Energy Energy. Thermal use of fuels Exact sciences and technology Fission nuclear power plants Installations for energy generation and conversion: thermal and electrical energy Pressurized water reactors Seals Strength of materials Stress corrosion cracking
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Beschreibung
Zusammenfassung:	Leakage of primary coolant from the canopy seal welds of control rod drive mechanism (CRDM) for PWR has been reported not only in Japan but also all over the world since the 1970s. The canopy seal weld is a circular weld designed to retain the pressure of reactor coolant while the strength of joints is maintained by thread. Since the coolant inside the canopy seal welds makes it easier for dissolved oxygen density to increase when a plant starts up, stress corrosion cracking (SCC) becomes a potential issue. Consequently, an advanced CRDM housing that eliminates all canopy seal welds has been studied, verified, and now applied to Vessel Head Replacement (VHR) plants in Japan.
ISSN:	0029-5493 1872-759X
DOI:	10.1016/S0029-5493(02)00011-0