ML20040H158
| ML20040H158 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/03/1982 |
| From: | Jacobs R Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20040H159 | List: |
| References | |
| NUDOCS 8202170330 | |
| Download: ML20040H158 (8) | |
Text
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k UNITED STATES
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g NUCLEAR REGULATORY COMMISSION g;
rj WASHING TON, D. C. 2C555 f
EEBRUARY 03 gy p
Docket No. 50-289 FACILITY: Three Mile Island, Unit.No.1 (TMI-1)
LICENSEE: GPU Nuclear Corporation (GPUNC)
SUBJECT:
SUMMARY
0F fiEETING.WITH GPUNC ON JANUARY 25, 1982 CONCERf{ING
' STEAM GENERATOR TUBE PROBLEMS'ON TMI-l
Background
In late November 1981, while the plant was in a cold shutdown condition, primary to secondary leakage was detected in the Once Through Steam i
Generator s (OTSGs). A total of 134 tubes were found to be leaking (90 in "A" 0TSG, 44 in "B" 0TSG). Since that time, GPUNC has conducted extensive efforts in the areas of eddy current testing and tube analysis to identify the cause and extent of the problem. The purpose of this meeting was to brief the staff on the results of GPUNCs efforts to date and their plans for resolving this problem. Copies of GPUNCs pre-sentation and a list of attendees are enclosed.
Discussion GPUNC indicated that the corrosive mechanism appears to be intergranular attack from the primary side resulting in the development of circumferential cracks.
Virtually all defects are located in the upper tube sheet area of the tubes. There is evidence of sulphur and chlorine impurities in the j
defects of the two removed tubes which have been extensively examined to date. A reduced form of sulphur is presently the suspect impurity.
The licensee is conducting a very comprehensive program in the areas of eddy current testing, tube failure analysis, accident analysis and tube repair techniques. He presently estimates that it will take a minimum of l
six months to resolve this problem. Perhaps the most important efforts l
now underway relate to metallography and chemical analysis of 19 removed tubes.
These efforts should confirm the type of corrosion, identify the l
l causative agent and the rate of crack growth. Additionally, these efforts will focus on the propensity for the same type of corrosion on other reactor system materials.
l To aid in resolving this problem GPUNC has formed a task force which includes corrosion, materials and chemistry consultants from B&W, Battelle Columbus, MPR Associates, Oak Ridge National Laboratories and EPRI. Addi tionally, the staff has formed a task force to review the problem and retained corrosion, materials and chemistry consultants from Brookhaven National Laboratories, Pacific Northwest Laboratories and Ohio State University.
The staff and their consultants will visit the laboratories where removed tubes are being examined and independently verify examination results.
Additionally, the staff and their consultants will independently review 8202170330 820203
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-2 chemistry and operations data provided by GPUNC to determine the cause of the problem. Staff / staff consultant evaluations will be used as the basis for evaluating GPUNC proposed resolutions to the OTSG problem.
The present method proposed by GPUNC for interim solution of this problem is to plug defective tubes with removable plugs. Since block plugging of many tubes (several thousand) can create undesirable thermal hydraulic effects on the seconddry side and affect other accident analyses, the licensee is planning on derating somewhat to compensate..
A major area of concern not fully addressed at this meeting is the sus-ceptibility of other reactor system materials to this type of corrosion.
Both the staff and GPUNC agree that the potential exists for corrosion attack on other reactor system materials, but no detailed program for evaluating this problem was discussed at the meeting. As more is learned about the type of corrosive attack, methods to be employed to evaluate if and to what extent corrosion has occurred outside the OTSG5 will be better defined.
I 3
v'L I
Richard H.
bo
, Project Manager Operating R rs Branch #4 Division of Licensing
Enclosures:
1.
List of Attendees 2.
GPUNC Presentation OR 7...IV....T...[).L...
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LIST OF ATTENDEES - 11EETING WITH GFUNC JANUARY 25, 1982 STEAi GENERATOR TUBE PROBLEMS AT TM1-1 NRC NRC Consultants GPUNC Consultants D. Eisenhut*
J. Weeks, BNL R. Schomaker, B&W T. Novak*
C. Dodd, ORNL R. Wascher, B&W G. Lainas*
R. Newnan, BNL M. Bell, B&W W. Johnston D. Rooyen, BNL N. Cole,11FR Ass.
C. ficCracken D. MacDonald, Ohio State S. Weems, itPR Ass.
R. Jacobs W. Berry, Battelle Columbus J. Stolz GPUNC F. Young P. Clark EPRI S. Reynolds (Region I)
H. Hukill J. Riesland E. flurphy R. Wilson W. Collins J. Colitz P. Grant R. Barley i
B. Turovlin E. Wallace P. Wu B. Elam L. Frank F. Giacobbe E. Woolridge N. Trikouros A. Taboada D. Slear K. Wichman T. Baxter,' Counsel for GPUNC C. Cheng P.11atthews
- 11. Tokar l
E. Brown
- Part Time 1
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UNITED STATES o
'l NUCLEAR REGULATORY COMMISSION o
h WASHINGTON, D. C. 20S55 E M UARY 03 1 R Docket No. 50-289 FACILITY: Three Mile Island, Unit No.1 (TMI-1)
LICENSEE: GPU Nuclear Corporation (GPUNC)
SUBJECT:
SUMMARY
OF F1EETING WITH GPUNC ON JANUARY 25, 1982 CONCERNING STEAM GENERATOR TUBE PROBLEMS ON TMI-l
Background
In late November 1981, while the plant was in a cold shutdown condition, primary to secondary leakage was detected in the Once Through Steam Generator s (OTSGs). A total of 134 tubes were found to be leaking (90 in "A" 0TSG, 44 in "B" 0TSG). Since that time, GPUNC has conducted 0xtensive efforts in the areas of eddy current testing and tube analysis to identify the cause and extent of the problem. The purpose of this meeting was to brief the staff on the results of GPUNCs efforts to date and their plans for resolving this problem.
Copies of GPUNCs pre-sentation and a list of attendees are enclosed.
Discussion GPUNC indicated that the corrosive mechanisrtappears to be intergranular attack from the primary side resulting in the development of circumferential cracks.
Virtually all defects are located in the upper tube sheet area of the tubes. There is evidence of sulphur and chlorine impurities in the defects of the two removed tubes which have been extensively examined to date. A reduced form of sulphur is presently the suspect impurity.
The licensee is conducting a very comprehensive program in the areas of l
eddy current testing, tube failure analysis, accident analysis and tube repair techniques. He presently estimates that it will take a minimum of six months to resolve this problem. Perhaps the most important efforts now underway relate to metallography and chemical analysis of 19 removed tubes.
These efforts should confirm the type of corrosion, identify the causative agent and the rate of crack growth. Additionally, these efforts will focus on the propensity for the same type of corrosion on other reactor sy"; tem materials.
To aid in resolving this problem GPUNC has formed a tas'k force which j
includes corrosion, materials and chemistry consultants from B&W, Battelle l
Columbus, f1PR Associates, Oak Ridge National Laboratories and EPRI. Additionally, the staff has formed a task force to review the problem and retained corrosion, materials and chemistry consultants from Brookhaven National Laboratories, Pacific Northwest Laboratories and Ohio State University.
The staff and their consultants will visit the laboratories where removed tubes are being examined and independently verify examination results.
Additionally, the staff and their consultants will independently review
Ds 2-chemistry and operations data provided by GPUNC to determine the cause of the problem. Staff / staff consultant evaluations will be used as the basis for evaluating GPUNC proposed resolutions to the OTSG problem.
The present method proposed by GPUNC for interim solution of this problem is to plug defective tubes with removable plugs. Since block plugging of many tubes (several thousand) can create undesirable thermal hydraulic effects on the secondary side and affect other accident analyses, the licensee is planning on derating somewhat to compensate.
A major area of concern not fully addressed at this meeting is the sus-ceptibility of other reactor system materials to this type of corrosion.
Both the staff and GPUNC agree that the potential exists for corrosion attack on other reactor system materials, but no detailed program for evaluating this problem was discussed at the meeting. As more is learned about the type of corrosive attack, methods to be employed to evaluate if and to what extent corrosion has occurred outside the OTSGs will be better defined.
. dv W
~
Richard H.
[co
, Project Manager Operating R rs Branch #4 Division of Licensing
Enclosures:
1.
List of Attendees 2.
GPUNC Presentation
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LIST OF ATTENDEES - MEETING WITH GPUNC JANUARY 25, 1982 STEAi GENERATOR TUBE PROBLEMS AT TM1-1 NRC NRC Consultants GPUtlC Consultants D. Eisenhut*
J. Weeks, BNL R. Schonaker, B&W.
T. Novak*
C. Dodd, 0RNL R. Wascher, B&W G. Lainas*
R. Newman, BNL M. Bell, B&W W. Johnston D. Rooyen, BNL N. Cole, MFR Ass.
C. ficCracken D. MacDonald, Ohio State S. Weems, NPR Ass.
R. Jacobs W. Berry, Battelle Columbus J. Stolz GPUNC F. Young P. Clark EPRI S. Reynolds (Region I)
H. Hukill J. Riesland E. 11urphy R. Wilson W. Collins J. Colitz P. Grant R. Barley B. Turovlin E. Wallace P. Wu B. Elam L. Frank F. Giacobbe E. Woolridge N. Trikouros A. "aboada D. Slear K. Wichman T. Baxter,' Counsel for GPUNC C. Cheng P. Ibtthews II. Tokar E. Brown
- Part Time
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ORBf4:DL MEETING
SUMMARY
DISTRIBUTION Licensee:
GPU Nuclear Corporation
' Copies also sent to SEV611 people on service (cc) list for subject plant (s).
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'JStolz Project Manager-RJacobs Licensing Assistant-RIngram OELD Heltemes, AE00 IE-3 SShowe Meeting Summary File-0RB#4 RFraley, ACRS-10 Program Support Branch ORAB, Rm. 542 BGrimes, DEP SSchwartz, DEP SRamos, EPDB FPagano, EPLB DEisenhut Glainas WJonnston CMcCracken-4 FYoung SReynolds (Reg. I)
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NRC PDR L PDR ORB #4 Rdg TNovak JStolz Project Itanager-RJacobs Licensing Assistant-RIngram OELD Heltemes, AE0D IE-3 SShowe Meeting Sunmary File-0RB#4 liFraley, ACRS-10 Program Support Branch ORAB, Rm. 542 BGrimes, DEP SSchwartz, DEP SRamos, EPDB FPagano, EPLB j
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