Vessels overflow protection

The connecting pieces for the measuring equipment of vessels can also be approximately determined. In the case of normal atmospheric vessels with one analogous and two binary level controls (pump and overflow protection) the related measuring equipment can be determined quite easily. 

The same appHes to the overflow protection LlA-i- (CLOOl). If the vessel threatens to overflow, e.g. when being filled from an HCl container, an alarm wiU be triggered off and the sirens and fiash lights will respond. 

The JSFR design uses a compact RV because of a simple vessel wall structure without a cooling system (hot vessel) and a compact in-vessel FHS with a combination of a slit UIS and an advanced FHM (see Fig. 11.1a). In Japan, hot vessels without a reactor cooling system have successfully accumulated operating experience in JOYO (Kara et al., 1976) and MONJU (Yokota et al., 1991). The JSFR vessel protection is fiuther simplified from JOYO and MONJU without an ex-vessel overflow system JOYO and MONJU have ex-vessel overflow systems to maintain steady sodium level during start-up operation to reduce transient thermal stresses. 

It is extremely important that vessels are well protected from an overflow condition. An overflowing vessel may have severe safety consequences, impacting nearby employees, the environment and the surrounding community. Some vessels require low-level protection to operate safely. Ideally, each vessel should have a visual indication for the operator, an alarm point and a transmitted level indicator [8]. 

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