ML20083L711
| ML20083L711 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/28/1982 |
| From: | Rajan J Office of Nuclear Reactor Regulation |
| To: | Bosnak R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20079G498 | List:
|
| References | |
| FOIA-83-243, FOIA-83-A-18 NUDOCS 8207140125 | |
| Download: ML20083L711 (7) | |
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!3 NUCLEAR REGULATORY COEblSSION
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JUN 2 81982 MEMORANDUM FOR: ' Robert Bosnak, Chief g
Mechanical Engineering Branch, DE p/3 H. Brammer, Leader THRU:
Section A, MEB, DE FROM:
J. Rajan, Mechanical Engineer Section A, MEB, DE
SUBJECT:
TMI-1 STEAM GENERATOR TUBE TUBESHEET REPAIR-
. MEETING
SUMMARY
- LIVINGSTON, NJ (6/21/82)
A meeting was held with GPUN on 6/21/82 at the Foster Wheeler Labs in Livingston, N.J. to demonstrate the kinetic expansion technique and the pullout test of the expanded tubes. A list of attendees is attached.
Foster' Wheeler explained the configuration of the modified charge (Figure 1) being considered for use at TMI-1. The primacord in the new charge is similar to the one being used in the conventional charge and may contain 14-20 grains of explosives per ft.
In the upper end of the
- polyethylene candle, a cavity is machined to accommodate a booster charge as shown. A low energy transfer cord (1 grain /ft) detonates the booster charge which in turn detonates the primacord. The advantage of the modified charge is that it leaves less debris, after the expansion.
In addition, there is greater flexibility in placing and detonating the charges since each charge is exploded individually with a low energy cord. Foster Wheeler is currently considering two kinetic expansions per tube. The initial expansion would be done with a 20 grains /ft primacord to be followed with a second expansion using 14 grains /ft.
Two expansions are considered necessary to achieve the goals set forth in the-design objectives and qualifications criteria (99% probability at confidence level of 99% that the kinetically expanded 4" long joint being tested meets the load carrying requirements of 3140 lbs). Pa ra-
- meters which may influence the choice of the number of tubes to be expanded with a single detonation are (1) noise level, (2) effect of expansion on adjacent tubes, (3) ability to quickly clean the debris after the expansion.
A demonstration of the kinetic expansion process was witnessed by the attendees on a 8" thick tube /tubesheet made up of representative materials but non corroded ~ specimens. Three tubes were expanded at a time and primacords with 20 and 14 grains /ft were used in two successive expansions.
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_2 The exoanded tubes were subjected to pullout tests without thermal cycling. An average of 4100 lbs pullout load was determined for the expanded joint. This is well above the qualification pullout load requirement of 3140 lbs.
GPUN expects to finalize the details of the kinetic expansion process before their meeting with NRC in Bethesda on June 29. A full demon-stration of the repair process will be set up in early July by GPUN.
nical Engineer Section A Mechanical Engineering Branch Division of Engineering cc:
R. Vollmer
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-. t TMI-1 Steam Generator Tube /Tubeshe:et Repair Meeting in Livin ston, NJ (6/21/82 LIST OF ATTENDEES C. McCraken CMEB NRC J. Rajan-MEB NRC S. Young Region I NRC C. Davy FRC V. Lu'k FRC M. Graham GPU Nuclear R. Coe B&W I. Berman Foster Wheeler D. Pai.
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