ML20062E959
| ML20062E959 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/29/1982 |
| From: | Mccracken C Office of Nuclear Reactor Regulation |
| To: | Benaroya V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8208110036 | |
| Download: ML20062E959 (3) | |
Text
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.It ITEMORATIDUM FOR:
Victor Benaroya, Chief Chemical Engineering Cranch Division of Engineering FR0ft:
Conrad McCracken, Section Leader Chemical Engineering Branch Division of Engineering SUBJECT STATUS UPDATE FOR TMI fl0.1 S.G. PEPAIRS GPU!! has finalized their S.G. repair plans. They intend to repair the maximum number of defects within the tubesheet by using a short expansion charge (17") for tubes with defects from 0 to 11 from the top of the upper tube sheet. Tubes with defects between 11" and 19" will be repaired with a 23" expansion charge. The 23'* expansion charge leaves a 1" unrepaired section in the 24" thick tubesheet to prevent a double ended tube tupture.
In each case a minimum of six inches of defect free tubing will be expanded to provide the required leak sealing propertie and structural integrity.
SPUfl's repair program and our verification program will focus on qualifying a six inch defect free seal.
"ecause g95% of all defects are between 0"
2" from the top of the upper tubesheet this technique will in fact provide a 15" minimum defect free seal for 95% of the repaired tubes.
The critical path for initiation of S.G. repair is a combination of eddy current testing and obtaining booster caps for the tube expansion charges.
relays in either of these programs now results in a one for one de&ay of repair initiation.
SCHEDULED FUTURE MEETIt!GS
- 7/21/82 Meeting with GPUfl in Partippany Franklin Research (FRC) and staff to receive updated information on the repair pnothesrand qualification testing.
- 7/29/82 Meeting with GPUN at TMI site;: staff ECT consultant (ORflL) and staff to review basis for tube plugging / repair deterttiination.
I 8/5/82 Mt. Vernon, FilD; flRC mangement, staff and consultants as appropriate to witness full scale tube expansion demonstration, I
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! 8/28,25 Final meeting / conclusions of GPUfl's third party l
26/82 independent review team.
4 Dates tenative/ subject to slippage Rated on curennt schnduling wn an nnt an+1cinate that con" m*"
be prep:r '
for S.C. tube expansions until the bec inning of September,,a t,,,the earl,,t es,t.,,
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Thus, GPutt's meeting with the staff and consultants to obtain repair approval will in all probability not occur until early September.
Areas of Concern Subsequent to the June 28th & 29th neetings we have had several telecons and meetings between staff personnel andoourcconsultants. At this tire, none of our consultants nor staff reviewers have identified any issues which we anticipate would affect the repair process. However, concern does exist as to the timeliness and completeness of some of the GPU!!
qualification programs, specially; 1.
Eddy current testing (ECT) stean Generators Gput! has not provided sufficient infornation to the staff to demonstrate that ECT is capable of adequately detecting defects outside of the tubesheet area so that they can be plupped.
We are hopeful that the majority of information needed will be provided at the 7/29/82 meeting.
Because the concern here is about tubes to be plugged due to defects outside of the tubesheet, it will not affect expansion repairs within the tubesheet.
2.
Rermal of sulfur residues from system surfaces.
GPUll's program to demonstrate the need for and to develop a method for chemically removing sulfur species from system surface seems to be lagging.
Because this process will not take place until af ter the expansion repairs are completed it will not affect repair initiatic1.
3.
Determination of the specific temperature /inpurity/ stress / oxygen concentrations that were required to initiate the corrosion.
Again, this will not affect the repair process but is desirable to more fully understand the propensity for continued corrosion.
4.
Completion of thermal life cycle qualification testing of the repair technique.
It does not appear as thoogh either GPUll or FRC will complete 40 year accelerated thenna. life cycle testing of expanded tube test sections prior to the time that this testing would become critical path for repair initiation. Our current intent is to require completion of 5 years of accelerated thermal life cycle testing, prior to initiation of repair and completion of the remaining thermal life cycle testing prior to restart.
Corrad McCracken, Section Leader Chemical Enaineerina Section Division of Enaineering omcr >... 'd'f " R'n "M" W "'
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DISTRIBUTION:
Central File:
CMEB File:
TMI File cc: PDR 50-289 R. Vollmer D. Eisenhut W. Johnston T. Novak G. Lainas J. Knight J. Stolz S. Pawlict.1 T. Su111 var.
H. Conrad W. Hazelton C. Cheng E.i!ur$hy P, l'u S. Young R. Jacobs P. Grant J. Pajan L. Frank C. cCracken l
TMI Consultants William Seagraves, FRE Br. fiacDonald, Ohio State Robert Dillon, PNL John Weeks, BNL C. Podd, ORNL
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