5.12. Leak tests should be performed to establish a baseline leakage measurement for each isolation device, air lock and penetration. The following components are the most sensitive parts of the containment envelope, and special attention should be paid to them:

(a) Isolation devices in systems open to the containment atmosphere;

(b) Isolation devices in fluid system lines penetrating the containment;

(c) Penetrations that have resilient or inflatable seals and expansion bellows, such as:

— personnel air locks,

— equipment air locks,

— equipment hatches,

— spare penetrations with bolted closures,

— cable penetrations with resilient seals,

— pipe penetrations with flexible expansion bellows in the connections to the containment.