Nuclear fuel rod wiping apparatus and method

• US 4,913,177 A
• Filed: 11/25/1988
• Issued: 04/03/1990
• Est. Priority Date: 11/25/1988
• Status: Expired due to Fees

• Current Assignee: Westinghouse Electric Corporation (Paramount Global (f/k/a ViacomCBS Inc.))
• Original Assignee: Westinghouse Electric Corporation (Paramount Global (f/k/a ViacomCBS Inc.))
• Inventors: Rieben, Stuart L., Scherpenberg, Joseph J.
• Primary Examiner(s): Roberts, Edward L.
• Application Number:
  US07/275,842
• Time in Patent Office: 494 Days
• Field of Search: 15/104.04, 15/97 R, 15/88, 134/6, 134/9, 118/DIG. 11
• US Class Current: 134/9
• CPC Class Codes: G21C 17/06 Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination G21C17/08, G21C17/10 take precedence; detecting leaking fuel elements during reactor operation G21C17/04
• CPC Class Codes: G21C 21/00 Apparatus or processes specially adapted to the manufacture of reactors or parts thereof in general section B, e.g. B23
• CPC Class Codes: Y02E 30/30 Nuclear fission reactors

Abstract

Tube wiping apparatus includes upper and lower reversely canted pinch rollers spaced along respective upper and lower sides of a first path along which the tube is moved and rotated by pairs of the upper and lower pinch rollers located at infeed and exit ends of the first path. The wiping apparatus also includes a toweling drive roll having an exterior surface engaging a toweling roll and carrying a continuous web of toweling along a second path, and a toweling pinch roll having an exterior surface pinching the toweling web between it and the drive roll for causing movement of the toweling web along the second path, across the first path and into contact with the tube so as to perform wiping of the exterior surface of the tube by the toweling. The drive roll with a yieldably resilient outer annular layer is disposed below a pair of the upper pinch rollers for capturing the tube therebetween as the tube is moved along the first path such that the roll outer layer and the toweling thereon are indented by contact with the tube causing the toweling to wrap partially around the tube exterior surface as wiping thereof occurs. A spray chamber is operable for applying a liquid spray to the tube to permit a wet wiping of the tube exterior surface by the toweling.

Claims

1. An apparatus for wiping an exterior surface of a tube, said wiping apparatus comprising:

(a) means for moving a tube along a first path while concurrently rotating the tube about its own longitudinal axis; and

(b) means for moving a web of toweling along a second path generally across said first path and into contact with the tube moving along said first path so as to perform wiping of the exterior surface of the tube.

2. The wiping apparatus as recited in claim 1, wherein said tube moving means includes:

a plurality of upper tube pinch rollers each having a peripheral annular tube-engaging groove and being spaced one from the next along an upper side of said first path; and

a plurality of lower tube pinch rollers each having a peripheral annular tube-engaging groove and being spaced one from the next along a lower side of said first path.

3. The wiping apparatus as recited in claim 2, wherein:

said upper pinch rollers are canted with respect to said first path; and

said lower pinch rollers are canted with respective to said first path, said canting of said lower pinch rollers being the reverse of said canting of said upper pinch rollers.

4. The wiping apparatus as recited in claim 2, wherein said pluralities of upper and lower pinch rollers include one pair thereof being located at an infeed end of said first path and another pair thereof being located at an exit end of said first path.

5. The wiping apparatus as recited in claim 4, wherein said tube moving means also includes:

means coupled to one of said upper and lower pinch rollers of said one pair thereof located at said infeed end of said first path and being operable for selectively moving said one roller toward and away from the other roller.

6. The wiping apparatus as recited in claim 4, wherein said tube moving means further includes:

means drivingly coupled to one of said upper and lower rollers of said pairs thereof at said infeed and exit ends of said first path for rotatably driving the same to move the tube along said first path.

7. The wiping apparatus as recited in claim 4, wherein:

said upper pinch rollers are canted with respect to said first path; and

said lower pinch rollers are canted with respective to said first path, said canting of said lower pinch rollers being the reverse of said canting of said upper pinch rollers such that rotation of said lower pinch rollers causes travel of the tube along said first path and concurrently rotation of the tube about its own axis.

8. The wiping apparatus as recited in claim 1, wherein said toweling moving means includes:

means for mounting the web of toweling in the form of a rotatable continuous roll thereof;

a rotatable toweling drive roll having an exterior surface which engages said toweling roll and carries the web of toweling along said second path; and

a rotatable toweling pinch roll having an exterior surface which in conjunction with said exterior surface of said drive roll pinches the web of toweling being carried on said drive roll for causing the toweling web to move about the periphery of said drive roll along said second path, across said first path and into contact with the tube.

9. The wiping apparatus as recited in claim 8, wherein said toweling moving means further includes:

means drivingly coupled to said drive and pinch rolls for rotatably driving the same to move the web of toweling along said second path.

10. The wiping apparatus as recited in claim 8, wherein said tube moving means includes:

a plurality of upper tube pinch rollers each having a peripheral annular tube-engaging groove and being spaced one from the next along an upper side of said first path; and

a plurality of lower tube pinch rollers each having a peripheral annular tube-engaging groove and being spaced one from the next along a lower side of said first path.

11. The wiping apparatus as recited in claim 10, wherein said toweling drive roll is disposed below a pair of said upper pinch rollers for capturing the tube therebetween as the tube is moved along said first path and causing the toweling to contact the tube.

12. The wiping apparatus as recited in claim 11, wherein said toweling moving means also includes:

means mounting said toweling drive roll for movement toward and away from said pair of upper pinch rollers.

13. The wiping apparatus as recited in claim 11, wherein said toweling drive roll has an outer circumferential layer of yieldably resilient material which defines said exterior surface of said drive roll carrying the toweling and is capable of being indented by contact with the tube for causing the toweling to wrap partially around the exterior surface of the tube as it performs wiping thereof.

14. The wiping apparatus as recited in claim 8, wherein said toweling roll mounting means includes:

a pair of arms being pivotally mounted at their upper inner ends; and

a support roll rotatably mounted between said arms at their lower outer ends and supporting the roll of toweling thereon, said support roller and arms under the influence of gravity disposing the roll of toweling in engagement with said drive roll.

15. The wiping apparatus as recited in claim 1, further comprising:

a spray chamber located adjacent an upstream end of said first path for applying a liquid spray to the tube to permit performance subsequently of a wet wiping by the web of toweling as the tube travels downstream along said first path.

16. An apparatus for wiping an exterior surface of a tube for removing any foreign matter adhered thereon, said wiping apparatus comprising:

(a) means for moving a tube along a first path while concurrently rotating the tube about its own longitudinal axis, said tube moving means includes

(i) a plurality of upper tube pinch rollers each having a peripheral annular tube-engaging groove and being spaced one from the next along an upper side of said first path,

(ii) a plurality of lower tube pinch rollers each having a peripheral annular tube-engaging groove and being spaced one from the next along a lower side of said first path,

(iii) said pluralities of upper and lower pinch rollers including one pair thereof being located at an infeed end of said first path and another pair thereof being located at an exit end of said first path; and

(vi) means drivingly coupled to one of said upper and lower rollers of said pairs thereof at said infeed and exit ends of said first path for rotatably driving the sam e to move the tube along said first path,

(v) said upper and lower pinch rollers being canted with respect to said first path, said canting of said lower pinch rollers being the reverse of said canting of said upper pinch rollers such that rotation of said lower pinch rollers causes travel of the tube along said first path and concurrently rotation of the tube about its own axis; and

(b) means for moving a web of toweling along a second path generally across said first path and into contact with the tube moving along said first path so as to perform wiping of the exterior surface of the tube.

17. The wiping apparatus as recited in claim 16, wherein said toweling moving means includes:

means for mounting the web of toweling in the form of a rotatable continuous roll thereof;

a rotatable toweling drive roll having an exterior surface which engages said toweling roll and carries the web of toweling along said second path; and

a rotatable toweling pinch roll having an exterior surface which in conjunction with said exterior surface of said drive roll pinches the web of toweling being carried on said drive roll for causing the toweling web to move about the periphery of said drive roll along said second path, across said first path and into contact with the tube.

18. The wiping apparatus as recited in claim 17, wherein said toweling moving means further includes:

means drivingly coupled to said drive and pinch rolls for rotatably driving the same to move the web of toweling along said second path.

19. The wiping apparatus as recited in claim 17, wherein said toweling drive roll is disposed below a pair of said upper pinch rollers for capturing the tube therebetween as the tube is moved along said first path and causing the toweling to contact the tube.

20. The wiping apparatus as recited in claim 19, wherein said toweling drive roll has an outer circumferential layer of yieldably resilient material which defines said exterior surface of said drive roll carrying the toweling and is capable of being indented by contact with the tube for causing the toweling to wrap partially around the exterior surface of the tube as it performs wiping thereof.

21. The wiping apparatus as recited in claim 17, wherein said toweling roll mounting means includes:

a pair of arms being pivotally mounted at their upper inner ends; and

a support roll rotatably mounted between said arms at their lower outer ends and supporting the roll of toweling thereon, said support roller and arms under the influence of gravity disposing the roll of toweling in engagement with said drive roll.

22. The wiping apparatus as recited in claim 16, further comprising:

a spray chamber located adjacent an upstream end of said first path for applying a liquid spray to the tube to permit performance subsequently of a wet wiping by the web of toweling as the tube travels downstream along said first path.

23. A method for wiping an exterior surface of a tube, said wiping method comprising the steps of:

(a) moving the tube along a first path while concurrently rotating the tube about its own longitudinal axis;

(b) moving a web of toweling along a second path generally across said first path and into contact with the tube moving along said first path; and

(c) establishing a region of moving contact between the moving and rotating tube and the moving toweling which performs wiping of the exterior surface of the tube.

24. The wiping method as recited in claim 23, wherein said moving of the web of toweling includes:

rotating a roll having an exterior surface which engages the web of toweling and carries the toweling along said second path.

25. The wiping method as recited in claim 24, wherein said establishing the region of moving contact includes:

forcing the tube against an outer circumferential layer of yieldably resilient material of the roll which defines the exterior surface thereof carrying the toweling so as to cause indenting of the roll outer layer and the toweling carried by the exterior surface and wrapping of the toweling partially around the exterior surface of the tube as it performs wiping thereof.

26. The wiping method as recited in claim 23, further comprising the step of:

at a location adjacent an upstream end of the first path applying a liquid spray to the tube to permit performance a wet wiping by the web of toweling as the tube travels downstream along the first path.