[en] Decontamination technology to (1) reduce personnel exposure to penetrating radiation, (2) reduce the potential for uptake of radioactive material, and (3) increase safety is being investigated. The West Valley Demonstration Project has had good experience with using heat-shrinkable end caps for sealing the cut ends of pipe containing radioactive contamination during D and R operations. This procedure is attractive for use at SRL/SRP during D and R operations for both contamination control and for personnel protection against sharp edges. This procedure is quicker than taping cut pipe ends or dipping them in liquid plastic that hardens to form a seal. 1 ref., 1 fig., 5 tabs

No abstract available

[en] A compact construction which was safe in operation was created by the omission of a special auxiliary pump arrangement for the cooling and lubrication of the shaft bearing. Instead of lubricating and cooling the shaft bearing and shaft seal, in the well known fashion by counter flow of the outward leakage flow of the circulating medium, the main leakage flow itself is used. This is made possibility by introducing a leakage flow cooler between the shaft bearing and a preceding labyrinth seal. A certain leakage flow from the pressure area of the pump passes through this preseal and then passes through the following, in turn, in an axial direction upwards: The leakage flow cooler, the shaft bearing (which is thus cooled and lubricated), several pressure reduction rings, a shaft seal with limited leak rate, and it then leaves the pump via a sealing housing and a steam seal housing via a duct for each of these. (TK)

[en] For the transmission of drive impulses through walls, a driving shaft is suitable which is gas-tight and pressure-tight supported in the wall openings. For the gas-tight and pressure-tight sealing of the areas separated by the walls are connected in series four ring-shaped soft seals and a circular chamber filled with lubricants is located between the second and third seal. This lubricant chamber communicates with a diaphragm pressure reservoir situated outside the wall entrance one chamber of which is filled with the same lubricant and the other with high-pressure gas. The gas exerts pressure through the diaphragm onto the lubricants and continually replenishes the lubricant chamber. The pressure in the lubricant chamber is higher than the pressure in the area to be sealed. It can constantly be checked by means of a pressure gauge. Besides, with a leakage measuring device located on an additional lubricant chamber around the driving shaft, the sealing of the driving shaft wall entrance can be checked. (DG)

[en] Inflatable door seals are used for airlocks in CANDU stations. They have been a significant source of unreliability and maintenance cost. A program is underway to improve their performance and reliability, backed by environmental qualification testing. Only commercial products and suppliers existed in 1993. For historical reasons, these 'existing products' did not use the most durable material then available. In hindsight, neither had they been adapted nor optimized to combat conditions often experienced in the plants-sagging doors, damaged sealing surfaces, and many thousands of openings and closings per year. Initial attempts to involve the two existing suppliers in efforts to upgrade these seals were unsuccessful. Another suitable supplier had therefore to be found, and a 'new,' COG-owned seal developed; this was completed in 1997. This paper summarizes its testing, along with that of the two existing products. Resistance to aging has been improved significantly. Testing has shown that an accident can be safely withstood after 10 years of service or 40,000 openings-closings, whichever comes first. AECL's Fluid Sealing Technology Unit (FSTU) has invested in the special moulds, test fixtures and other necessary tooling and documentation required to begin commercial manufacture of this new quality product. Accordingly, as with FSTU's other nuclear products such as pump seals, the long-term supply of door seals to CANDU plants is now protected from many external uncertainties-e.g., commercial products being discontinued, materials being changed, companies going out of business. Manufacturing to AECL's detailed specifications is being subcontracted to the new supplier. FSTU is performing the quality surveillance, inspection, testing, and customer service activities concomitant with direct responsibility for supply to the plants. (author)

No abstract available

[en] Radial friction at seal assembly component interfaces causes deflection of main coolant pump seal faces during changes in operating temperature and pressure. Laboratory tests show that the sensitivity sf Model SU-5500 seals to such changes is caused by high axial loads between these components and by differences in radial expansion, modulus, and stiffness. (author)

[en] The container consists of a box-shaped metal case with two lids fixed by hinges at the top or in a side wall. The lids and hinges are covered by seals which in the closed state guarantee sealing of the container contents against the atmosphere. Two slide bars are fitted on two opposite edges on the container floor. The seals preferably consist of foam rubber. (DG)

[en] The seal is described of jacket thermocouples located in the pressure reducer in the fuel element suspension rod. The thermocouples are sealed in the pressure reducer with a silicon sealing compound. The sealing compound is compressed between the two reducers with a Bellevile spring and a pressure washer secured in position with a spring. The axial pressure of the inner parts of the reducer on the compound is adjustable by means of a thrust screw. The tightness and alignment of the thermocouples in the pressure reducer is achieved by tightening the thrust screw to the stop of the top reducer and the subsequent setting of the sealing compound. (J.B.)

No abstract available