ML19332C770
| ML19332C770 | |
| Person / Time | |
|---|---|
| Issue date: | 11/07/1989 |
| From: | Koscielny S Office of Nuclear Reactor Regulation |
| To: | Cheng C Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8911280529 | |
| Download: ML19332C770 (6) | |
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' WOV 0 71M9 MEMORANDUM.FOR:
C. Y. Cheng, Chief Materials and Chemical Engineering Branch Division of Engineering Technology FROM:
Stephen Koscielny, Corrosion Engineer Chemical Engineering Section Materials and Chemical Engineering Branch Division of Engineering Technology
SUBJECT:
SUMMARY
OF MEETING WITH THE BWROG/GE/EPRI ON UPDATE ON HYDR 0 GEN WATER CHEMISTRY AND RELATED ISI ISSUES i
INTRODUCTION:
This meeting was held in Rockville, Maryland October 10, 1989, at the request of NRC for the BWROG/GE/EPRI to inform the staff and to discuss with the staff the program concerning Hydrogen Water Chemistry Status, current field experience L
and proposed ISI credit in order to relax inspection requirements as a result of installation and operation of a Hydrogen Water Chemistry system. The agenda for the meeting is attached as Enclosure (1). The attendees are identified in Enclosure (2). The BWROG/GE/EPRI presentation is attached as Enclosure (3).
BACKGROUND:
l Boiling water reactors have experienced stress corrosion cracking in the reactor coolant system piping resulting in forced shutdowns, reduced plant availability and additional personnel radiation exposure for repairs and pipe replacement.
Results of research conducted in the area of stress corrosion cracking show that the likelihood of cracking depends on reactor water chemis-try, in particular, on the concentrations of ionic impurities and oxidizing radiolysis products such as oxygen as well as on material condition and stress level. Tests have demonstrated that the concentration of oxidizing radiolysis products in the recirculating water of a BWR-can be reduced substantially by 1
injecting hydrogen into the feedwater. Further the BWROG states that recent plant data indicate that the rate of intergranular stress corrosion cracking of sensitized austenitic stainless steel in reactor recirculation system can be l
reduced to levels which are not measurable by injection of hydrogen into the i
feedwater if the concentration of ionic impurities (e.g. conductivity less than 0.3 us/cm at 25'C) is kept sufficiently low and the electrochemical potential is less than -230 mv (Standard Hydrogen Electrode). As a result of this information the BWROG/GE/EPRI are proposing relaxation of the inservice inspec-tions requirements of reactor coolant system piping for stress corrosion cracking for plants which have implemented a Hydrogen Water Chemistry Program.
Plent experience was discussed during the meeting by Commonwealth Edison, Carolina l
Power and Light, and the New York Power Authority. GE and EPRI presented the current research being conducted on the subject.
The BWROG provided a summary of recomended inspection schedules for BWR piping weldments for plants with an operational Hydrogen Water Chemistry program.
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C.,Y. Cheng ~ CONCLUSION:
The Hydrogen Water Chemistry program concept has potential as a method for reducing or eliminating stress corrosion cracking. Some areas of concern were discussed with the BWROG. The staff will consider the BWROG request for relief from ISI requirements as a result of installation of a Hydrdgen Water Chemistry System when the BWROG report on the subject is formally docketed.
A Stephen K.scielny, Corrosion Engineer Chemical Engineering Section Materials and Chemical Engineering Branch Division of Engineering Technology cc: Stephen D. Floyd w/o enclosure (3)
G. M. Gordon w/o enclosure (3)
Robin Jones w/o enclosure (3) l DISTRIBUTION:
CENTRAL FILES EMCB RF J.E. Richardson F.J. Witt NRC PDR E.G. Tourigny
-J.R. Hall B.L. Siegel DET:EMCB l
SKoscielny:vad i
l' 11/6/89 5520 DOCUMENT NAME:
SUMMARY
MTG W/BWROG l
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.j' g.g-NOV071982 C. Y. Cheng,
r CONCLUSION:
- The Kydrogen Water Chemistry program concept has potential as a method for reducing or eliminating stress corrosion cracking. Some areas of concern were discussed with the BWROG. The staff will consider the BWROG request for relief from ISI requirements as a result of installation of a Hyorogen Water Chemistry System when the BWROG report on the subject is formally docketed.
t StephenKkscielny,CorrosionEngineer Chemical Engineering Section Materials and Chemical Engineering Branch Division of Engineering Technology cc: Stephen D. Floyd w/o enclosure (3)
G.M.Gordonw/oenclosure(3)
Robin Jones w/o enclosure (3)
DISTRIBUTION:.
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J.E. Richardson F.J. Witt NRC PDR E.G. Tourigny J.R. Hall -
B.L. Siegel DET:EMCB%
SKoscielny:vad lI/6 /B9 5520 DOCUMENT NAME:
SUMMARY
MTG W/BWROG
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i ENCLOSURE 1 AGENDA FOR l
NRC MEETING WITH BWROG/GE/EPRI OCTOBEP. 10, 1989 - 9 AM RM BB11, WHITE FLINT BUILDING H
ROCKVILLE, MARYLAND I
UPDATE.ON.HWC.AND.RELATED ISI ISSUES PROPOSED. PRESENTERS INTRODUCTION BWROG/NRC CURRENT HWC UNDERSTANDING AND R. C0WAN, GE FLEET IMPLEMENTATION STATUS 1
. FUEL PERFORMANCE RECENT FIELD EXPERIENCE WITH HWC ASSESSMENT OF DRESDEN-2 HIEN 00, CECO PIPING UT INDICATIONS S. RANGANATH, GE EFFECT-0F DECONTAMINATION ON ISI R. JONES, EPRI DUANE ARNOLD HWC G. GORDON, GE
' PROGRAM RESULTS BRUNSWICK FLOW RATE EFFECT B. WHITE, CP&L ON ECP MEASUREMENT (STARTUP VS.
MINITEST)
FITZPATRICK HWC CAVS RESULTS J. GOLDSTEIN, NYPA QUANTIFYING THE BENEFIT OF HWC G. GORDON/
IN MITIGATING IGSCC S. RANGANATH, GE GE/EPRI IGSCC MODEL PREDICTIONS VS.
FIELD AND LAB DATA
+ PIPING AND SAFE END/N0ZZLE ATTACHMENTS INCLUDING INCONEL BUTTER AND THERMAL SLEEVE ATTACHMENTS
+ VESSEL INTERNALS AND INTERNAL ATTACHMENTS MONITORING / VERIFICATION OF HWC EFFECTIVENESS 10F 2
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ENCLOSURE 1 AGENDA FOR NRC MEETING WITH BWROG/GE/EPRI OCTOBER 10, 1989 - 9 AH RM 8811, WHITE FLINT BUILDING ROCKVILLE, MARYLAND i
LP E E 0W.HWC AND RELATED.ISI.1SSUES PROPOSED. PRESENTERS EPRI HWC GUIDELINES / FUTURE PLANS R. JONES, EPRI BWROG PLAN FOR PROACTIVE INTERNALS S. FLOYD, BWROG INSPECTION AND CONTINGENCY REPAIRS BWROG PLAN FOR OBTAINING GENERIC S. FLOYD, BWROG ISI CREDIT FOR HWC OPERATION-NRC FEEDBACK NRC s
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ENCLOSURE (2)
ATTENDANCE. LIST Robert Hermann NRR/EMCB 301-492-0911 Stephen Koscielny NRR/EMCB 3Q1-492-C826 Kris Parczewski NRR/EMCB 301-492-3252 Damiano LaMustra PSE&G 609-339-5058 Curt Bock 1AEC/IELP 319-851-7645 Tim Long Georgia Power / Hatch 205-877-7409 Hien Do Commonwealth Ed.
312-294-4397 Stan Walker EPRI NDE Center 704-547-6081 Ben White CP&L Brunswick 919-457-2538 E.G. Tourigny NRC/NRR/ Brunswick PM 301-492-1474 GM Gordon General Electric Co.
408-925-6421 Lynn Connor The NRC Calenohr 301-229-6553 Robert Lilorenzo GPU huclear 201-316-7205 John Fox TVA 615-751-4964 Sam Ranganath GE Nuclear Energy 408-925-6825 Peter Ford GE Corp. R&D Center 518-387-5821 86rry Gordon GE Nuclear Energy ~
408-925-2559 Robin Jones EPRI 415-851-2791 Jeff rey Goldstein New York Power Authority 914-681-6285 Ron Grover New York Power Authority 914-681-6284 Robert L Layman
-GE Nuclear Energy 408-925-6472 Stephen D. Floyd Carolina Power & Light Co.
919-546-6901 James R. Hall NRC Duane Arnold PM 301-492-1391 Byron L Siegel NRC/NRR/PD 3-2 301-492-3019 Alan Small BECO 508-747-8746 l
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