Abstract: A nuclear reactor comprises a nuclear reactor core disposed in a pressure vessel. An isolation valve protects a penetration through the pressure vessel. The isolation valve comprises: a mounting flange connecting with a mating flange of the pressure vessel; a valve seat formed into the mounting flange; and a valve member movable between an open position and a closed position sealing against the valve seat. The valve member is disposed inside the mounting flange or inside the mating flange of the pressure vessel. A biasing member operatively connects to the valve member to bias the valve member towards the open position. The bias keeps the valve member in the open position except when a differential fluid pressure across the isolation valve and directed outward from the pressure vessel exceeds a threshold pressure.

Abstract: An arrangement for holding elongate substrates in a desired array having a plurality of passageways divided into compartments separated by pairs of spaced apart parallel flexible arms. The arms allow only two substrates to be inserted into each compartment, providing separation of additional substrates and the cannonballing effect is thereby eliminated.

Abstract: A heat recoverable article for sealing splices having substrates of disparate size. The heat recoverable article includes a first heat shrinkable sleeve having an adhesive which extends over at least part of its interior surface and a second heat shrinkable sleeve which overlaps an end of the first sleeve. The second sleeve begins to recover before the first sleeve and holds the first sleeve in place as recovery continues, eliminating milk off.