ML20207H611
| ML20207H611 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/22/1986 |
| From: | Jaffe D Office of Nuclear Reactor Regulation |
| To: | Thadani A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8701070575 | |
| Download: ML20207H611 (40) | |
Text
{{#Wiki_filter:, o " DEC 2 21986 Docket No. 50-336 MEMORANDUM FOR: Ashok C. Thadani, Director PWR Project Directorate #8 Division of PUR Licensing-B FROM: D. H. Jaffe, Project Manager PWR Project Directorate #8 Division of PWR Licensing-B
SUBJECT:
SUMMARY
OF THE DECEMBER 3, 1986 MEETING WITH NORTHEAST NUCLEAR ENERGY COMPANY (NNECo) TO DISCUSS STEAM GENERATOR TUBE INSPECTION On December 3, 1986, representatives of NNEco and the NRC staff met in Room P-412 in the Phillips Building, Bethesda, Maryland. The purpose of the meeting was to hear a presentation by NNECo concerning the recent steam generator tube inspection at Millstone Unit 2. A list of attendees is shown in Enclosure 1. The staff had requested that NNECo provide a presentation concerning the Millstone Unit 2 steam generator tube inspection as a result of early indications which seemed to be significant. The NNECo presentation is summarized in Enclosure 2. The main points of the presentation were as follows: o Improvements in eddy-current test (ECT) techniques resulted in positive definition of distorted indications located near the top of the tubesheet, and identification of an increased number of flaws. o Essentially all pits continue to be related to sludge / deposit build-up located in the region above the tubesheets. o Countermeasures are apparently successful in reducing or arresting pitting: Copper continues to be removed from the condensate /feedwater system. During the outage, the main condenser was retubed with titanium. Improved chemistry control / reverse osmosis during Cycle 7 was beneficial. Chemical cleaning during the 1985 refueling outage was also beneficial. o An order of magnitude defect reduction (2366 to 246) was observed. o No significant pit growth appeared to be taking place. k[ O [ J
o Meeting Summary o Batwing region defects seemed to be anomalous, apparently isolated occurrence in three tubes. o Dent progression is minimal; NNECo expects complete arrest in the near future as a result of countermeasures including those listed above. o A total of 245 tube ends received sleeves. o A total of nine tubes were plugged. In conclusion, NNECo appeared quite positive regarding the results of the inspection and seemed to feel that their steam generator program was yielding pcsitive results. No outstanding issues resulted from the meeting. crigmal agr*1 Dy D. H. 'Jaffe, Project Manager PWR Project Directorate #8 Division of PWR Licensing-B
Enclosures:
As stated cc w/ enclosures: See next page [s [
, j PBD#8, PBD7s PBD#
PK' vdzer DJafN AThadani l'r 2//[/86 12/(//8 12/11/86 l
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Mr. John F. Opeka Millstone Nuclear Power Station Northeast Nuclear Energy Company Unit No. 2 cc: Gerald Garfield, Esq. Mr. Wayne D. Romberg Day, Berry & Howard Superintendent Counselors at Law Millstone Nuclear Power Station City Place P. O. Box 128 Hartford, Connecticut 06103-3499 Waterford, Connecticut 06385 Regional Administrator, Region I Mr. Edward J. Mroczka U.S. Nuclear Regulatory Commission Vice President, Nuclear Operations Office of Executive Director for Northeast Nuclear Energy Company Operations P. O. Box 270 631 Park Avenue Hartford, Connecticut 06141-0270 King of Prussia, Pennsylvania 19406 Mr. John F. Opeka, Senior Vice President Mr. Charles Brinkman, Manager Nuclear Engineering and Operations Washington Nuclear Operations Northeast Nuclear Energy Company C-E Power Systems P. O. Box 270 Combustion Engineering, Inc. ,Nartford, Connecticut 06141-0270 7910 Woodmont Avenue Bethesda, Maryland 20814 Mr. Lawrence Bettencourt, First Selectman Town of Waterford Hall of Records - 200 Boston Post Road Waterford, Connecticut 06385 Northeast Utilities Service Company ATTN: Mr. Richard R. Laudenat, Manager Generation Facilities Licensing Post Office Box 270 Hartford, Connecticut 06141-0270 Kevin McCarthy, Director Radiation Control Unit Department of Environmental Protection State Office Building Hartford, Connecticut 06106 Mr. Theodore Rebelowski U.S. NRC P. O. Box 615 Waterford, Connecticut 06385-0615 Office of Policy & Management ATTN: Under Secretary Energy Division 80 Washington Street Hartford, Connecticut 06106
'~ Enclosure 1 LIST OF ATTENDEES NNECo N. Azevedo J.-Benson.
J. Fackelmann E. Perkins NRC G. Brown-ACRS C. Y. Cheng
. D. Crutchfield D. Jaffe L. Marsh G. Staley M. Wegner R. Wright I
a l 1
as .r d 1- -L 1a - .-. - ,m A Enclosure 2 i - 1-NORTHEAST NUCLEAR ENERGY COMPANY MILLSTONE UNIT NO. 2 [ DOCKET #50-336 f
\
i DECEMBER 3, 1986 MEETING-WITH NRC STAFF .1 STEAM GENERATOR TUBE ECT RESULTS s wn , ,.,-e ---,.~,.e ---.-.--m.---.-m-,.
MEETING AGENDA MILLSTONE UNIT NO. 2 - STEAM GENERATOR EDDY CURRENT TESTING RESULTS o INTRODUCTION E. P. (CHIP) PERKINS LICENSING o OVERVIEW 0F ECT RESULTS JOSEPH M. FACKELMANN - NUCLEAR MATERIALS AND CHEMISTRY o RESULTS OF EDDY CURRENT JAMES M. BENSON - TESTING NUCLEAR MATERIALS AND CHEMISTRY 1 o 1986 SLEEVING AND NELSON F. AZEVED0 - PLUGGING PROGRAM GENERATION MECHANICAL ENGINEERING o
SUMMARY
AND CONCLUSIONS E. P. (CHIP) PERKINS LICENSING r
l i 3-PURPOSE OF MEETING o TO REPORT THE RESULTS OF EDDY CURRENT TESTING CONDUCTED DURING THE 1986 REFUELING OUTAGE' TESTING TECHNIQUES /RESULTS SLUDGE EVALUATION PLUGGING & SLEEVING PROGRAMS
~
o TO DEMONSTRATE THE NNEC0 CONCLUSION THAT MILLSTONE UNIT N0. 2 SG TUBE INTEGRITY IS ASSURED FOR OPERATION THROUGH CYCLE 8. 4 e e
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D 9 9 OVERVIEW 0F ECT RESULTS l JOSEPH M. FACKELMANN
, DVERVIEW 0F ECT RESULTS 0
IMPROVEMENTS IN ECT TECHNIQUES RESULTED IN POSITIVE DEFINITION OF DISTORTED INDICATIONS LOCATED NEAR THE TOP 0F THE TUBESHEET, AND IDENTIFICATION OF AN INCREASED NUMBER OF FLAWS. 0 ESSENTIALLY ALL PITS CONTINUE TO BE RELATED TO SLUDGE / DEPOSIT BUILD-UP LOCATED IN THE REGION ABOVE THE TUBESHEETS. O MP2 COUNTERMEASURES APPARENTLY SUCCESSFUL IN REDUCING OR ARRESTING PITTING: COPPER REMOVAL B0P/ TITANIUM CONDENSER 1986 IMPROVED CHEMISTRY CONTROL / REVERSE OSMOSIS DURING CYCLE 7 CHEMICAL CLEANING 1985 ORDER OF MAGNITUDE DEFECT REDUCTION (2366 TO 246) N0 SIGNIFICANT PIT GROWTH 0 BATWING REGION DEFECTS ANOMALOUS, APPARENTLY ISOLATED OCCURRENCE IN THREE TUBES. O DENT PROGRESSION MINIMAL, EXPECT COMPLETE ARREST IN NEAR FUTURE AS A RESULT OF COUNTERMEASURES INCLUDING THOSE LISTED AB0VE.
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m. 4 1986 REFUELING OUTAGE EDDY CURRENT TEST RESULTS
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MILLSTONE 2 STEAM GENERATOR EDDY CURRENT TEST RESULTS (1986 REFUELING OUTAGE) O TEST TECHNIQUES 0 TEST RESULTS 0 COMPARISON TO PREVIOUS TESTS 0
SUMMARY
/ CONCLUSIONS 0
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EDDY CURRENT TEST TECHNIQUES 1986 REFUELING OUTA6E 0 MlZ-18 DIGITAL EDDY CURRENT TESTER SYSTEM 0 DDA-4 DIGITAL ANALYSIS SYSTEM 0 DOUBLE DATA ANALYSIS O POTENTIAL DAMAGE FORMS ADDRESSED BY SPECIAllZED PROBES 0 SIGNIFICANT IMPROVEMENTS APPLIED TO 1986 EXAM: 3-FREQUENCY MIXING: SUPPRESSION OF INTERFERING DENT AND TOP-0F-TUBESHEET SIGNALS. ROTATING SURFACE RIDING PROBES: FLAW GE0 METRY. SELF ORIENTING SEGMENTED B0BBIN: FLAW ORIENTATION. IMPROVED LARGER DIAMETER PROBE FOR 100 PERCENT INSPECTION: S/N. ,
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PRELIMINARY MILLSTONE 2 STEAM 6ENERATOR ECT INSPECTION
SUMMARY
(DATA THROUGH NOVEMBER 29, 1986) STEAM GENERATOR WUMBER 1 DESCRIPTION HOT SIDE COLD alDE HOT & COLD SIDE 10 NUMBER TUBE 6964 5546 12,510 SIDES TESTED 20 NUMBER TUBE SIDES WITH FLAWS 21 > = 20% ' 1356 407 1763 22 > ' 40% 82 83 165 30 NUMBER TUBE SIDE WITH DISTORTED INDICATIONS 0 0 0 4.0 NUMBER OF FLAWS > = 20% (SOME TUBES HAVE MORE THAN ONE FLAW) 41 0-1" 1291 290 1581 42 1"-13" 228 260 488 43 13"-28" 2 0 2 l 4 4- OTHER 4" 0 4 45 TOTAL 1525 550 2075 50 NUMBER PLUGGABLE RESTRICTIONS 1 0 1 , (GAUGES DENTING) i LOCATED AT FIRST DIAGONAL SUPPORT STRAP HOT LEG SIDE. l l
_i3 PRELIMINARY MILLSTONE 2 STEAM GENERATOR ECT INSPECTION
SUMMARY
(DATA THROUGH NOVEMBER 29, 1986) STEAM GENERATOR NUMBER 2 DESCRIPTION HOT SIDE COLD SIDE HOT t COLD SIDE 1.0 NUMBER TUBE 7576 5534 13,110 SIDES TESTED 2.0 NUMBER TUBE SIDES WITH FLAWS 2.1 > = 20 % 474 296 770 4 22 > = 40% 26 55 81 3.0 NUMBER TUBE SIDE WITH DISTORTED INDICATIONS 0 0 0 4.0 NUMBER OF FLAWS > =~20% (SOME TUBES HAVE MORE THAN ONE FLAW) 4.1 0-1" 404 87 491 4.2 1"-13" 127 264 391 43 13"-28" 2 1 3 44 OTHER 0 0 0 45 TOTAL. 533 352 885 h 50 NUMBER PLUGGABLE' RESTRICTIONS 2 0 2 l l l
MILLSTONE 2 BATWING REGION INSPECTION 1986 REFUELING OUTA6E O APPR0XIMATELY 20 PERCENT OF ALL TUBES TESTED THROUGH BATWING REGION (1585 IN SG 1, 1528 IN SG 2). ALL UNPLUGGED TUBES IN R0WS-35-38 AND R0WS 66-67 WERE TESTED IN BATWING REGION. TUBES IN OTHER R0WS WERE RAND 0MLY INSPECTED 1.N BATWING REGION AS PART OF FULL LENGTH INSPECTION. 0 THREE TUBES CONTAINED FLAWS AT FIRST HOT LEG BATWING SUPPORT: SG 1 (HL) 15.1 86%, 5 VOLTS, 0.0" SG 1 (HL) 154 75%, 4 VOLTS, 1 3"
- 78%, 2 VOLTS, 1 9" SG 1 (HL) 145 83%, 2 VOLTS, 0 0" ,
O FLAW CHARACTERISTICS: DD INITIATED. LOCATED ON EXTRADOS OF 90 BEND. , WEAR RULED OUT. LIMITED TO R0WS 36 AND 37 0F SG 1 PROBABLY CAUSED BY SOME FORM 0F CORROSION, APPARENTLY STRESS RELATED.
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OF STEAM GENERATOR TUBE SLEEVING AND PLU6GING CANDIDATES MILLSTONE 2 1986 REFUELING OUTAGE SLEEVING
SUMMARY
REASON FOR SLEEVING 1_CL l_HL 2_CL 2_HL TOTAL DEFECT 140% THROUGHWALL 83 79 55 26 243 INCOMPLETE TEST _2 _Q _Q _Q __2 TOTAL 85 79 55 26 245 PLUGGING
SUMMARY
REASON FOR PLUGGING 1G_1 16_1 TOTAL DEFECT 1 40 PERCENT 3 0 3 THROUGHWALL 0 540 INCH DIAMETER 1 2 3 PROBE RESTRICTION . 0 520 INCH DIAMETER 0 1 1
. SLEEVE PROBE RESTRICTION INCOMPLETE TEST
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MILLSTONE 2 STEAM GENERATOR TUBE FLAW PROGRESSION MARCH 1985 TO NOVEMBER 1986 FOR FLAWS >20 PERCENT THROUGHWALL IN SG 1 AND SG 2 COLD SIDE ELEVATION NUMBER AVERAGE STD. DEV. TTS (0" TO 1") 34 3% 14% ATS (>1') 160 1% 10% HOT SIDE ELEVATION NUMBER AVERAGE STD. DEV. TTS (0" TO 1") 405 0% 8% ATS (>1") 79 0% 9% l
_19_ MILLSTONE 2 STEAM GENERATOR TUBE FLAW PROGRESSION DECEMBER 1981 TO NOVEMBER 1986 FOR FLAWS >20 PERCENT THROUGHWALL IN SG 1 AND SG 2 TTS (0" TO 1") NUMBER AVERAGE STD. DEV. DEC '81-JUN '83 102 3% 11% JUN '83-MAR '85 124 2% 10% MAR '85-NOV '86 439 0% 9% ATS (>1") NUMBER AVERAGE STD. DEV. DEC '81-JUN '83 49 29% 18% JUN '83-MAR '85 41 17% 17% MAR '85-NOV '86 239 1% 9% t ( 1 l l
MP2 STEAM GENERATOR TUBE FLAW DEPTH 9 COMPARISON OF 1985 L 1986 EDDY CURRENT TEST RESULTS 2,500-
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MILLSTONE 2 STEAM GENERATOR ECT INSPECTION
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FOR NEWLY IDENTIFIED FLAWS NUMBER OF TUBES SIDES WITH FLAWS >20% SGI-HL SGI-CL SG-HL SG-CL TOTAL 20-40% 860 277 350 172 1659
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40-60% 65 46 19 30 160 2101 3 _22 __2 _la as TOTAL , 928 345 371 220 1864 NOTE: 70 PERCENT OF NEW FLAWS WERE LOCATED WITHIN 1 INCH OF TOP-0F-TUBESHEET.
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MILLSTONE 2 STEAM GENERATOR SLUDGE HEIGHT COMPARISON (1985 AFTER LANCING * - 1986 AFTER LANCIN6) SGI-CL _S61-HL SG-CL SG-HL SGI a SG NUMBER OF 350 492 371 510 1723 TUBE ENDS TESTED BOTH YEARS AVERAGE -0 6" -1 0" -0.8' -1 2" -0 9' CHANGE IN HEIGHT (1985-1986) . FOLLOWING CHEMICAL CLEANING l l l l
1
. ~ 1 MILLSTONE 2 SLUDGE REMOVAL
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RAIE VENDOR DESCRIPTION LBS REMOVED all IL2 ) l JUL '83 CE' FIRST TIME LANCING 800 800 MAR '85 X** PRECLEANING LANCING 298 228 CE CHEMICAL CLEANING 310 257 X** POST CLEANING LANCING _.B.E -lfiQ TOTAL 688 645 NOV '86 CE' LANCING 454 498 SPRAY FROM PERIPHERY (MULTI-DIRECTIONAL). SPRAY FROM BLOWDOWN LANE (ONE DIRECTION ONLY). e
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SUMMft 0 ALMOST ALL FLAWS ARE LOCATED AB0VE TUBESHEET IN HIGHEST SLUDGE REGION IN CENTER OF SGS. O MAJORITY OF FLAWS LOCATED ON HOT LEGS AT TDP 0F TUBESHEET. (THESE TENDED TO BE SHALLOW IN DEPTH.) 0 THREE OF 3113 TUBES TESTED IN BATWING REGION CONTAINED DEFECTS. O FLAWS WHICH EXISTED IN MARCH 1985 DISPLAYED ESSENTIALLY N0 GROWTH (0N THE AVERAGE) DURING CYCLE 7 TP!S IS MUCH LESS THAN THE FLAW PROGRESSION RATES OBSERVED DURING CYCLE 6 (17 PERCENT) AND CYCLE 5 (29 PERCENT). ~ 0 A REVIEW 0F 1985 ECT DATA TAPES FOR 43 TUBES WITH NEWLY IDENTIFIED FLAWS OF >60 PERCENT THROUGHWALL REVEALED THAT 31 OF THE FLAWS EXISTED PREVIOUSLY. O A FACTOR OF,12 DECREASE WAS OBSERVED FROM MARCH 1985 TO NOVEMBER 1986 IN THE NUMBER OF TUBE ENDS REQUIRING REPAIR. O SLUDGE' HEIGHTS ARE.AT THEIR LOWEST LEVEL SINCE. PITTING WAS FIRST IDENTIFIED AT MILLSTONE 2 IN 1981
.0 DENT P,ROGRESSION APPEARS MINIMAL BASED ON THREE RESTRICTED TUBES (SAME AS CYCLE 6) AND PRELIMINARY PROFILOMETRY DATA.
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O O e e 1986 REFUELING OUTAGE SG TUBE SLEEVING AND PLUGGING PROGRAM NELSON F. AZEVED0 1 I 1
h a ek- >4 e MILLSTONE UNIT NO 2 1986 SLEEVING AND PLUGGING PROGRAM
- 1. SLEEVABLES PLUGGABLES FROM ECT 245 9 ACTUAL 225 28
- 2. REASONS FOR PLUGGING STEAM GENERATOR #2 16 - HOT LEG RESTRICTIONS 2 - OUT OF C/L SLEEVING B0UNDARY l - UNINSPECTED TUBE STEAM GENERATOR #1 -
3 - BAT WING DEFECTS 1- OUT OF SLEEVING B0UNDARY l- COLD LEG RESTRICTION 1- PROBE STUCK IN TUBE - BOTH ENDS SLEEVED 1- ECT RESTRICTION 1- ADJACENT TO STAY R0D 1- UNACCEPTABLE SLEEVE INSTALLATION
SUMMARY
SLEEVES PLUGGED TUBES ACTUAL TO DATE 5154 1790 EQUIVALENT PLUGS TO DATE 2094 + ALLOWABLE " EQUIVALENT" PLUGGING LIMITS REMAINING: S/G #1 = 201 S/G #2 = 317
=
TOTAL 402 4 O- .h _ - , _ p , y- w m, m - e.-m, w T----a-w - - - <-v-- -wv< --
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+ CONCLUSIONS:
o S/G #2 HOT LEG RESTRICTIONS APPEAR TO BE A COMBINATION OF TUBE DENTING AND TUBE BENDING. o BOTTOM PORTION OF THE SLEEVES WHICH WERE REMOVED TO ALLOW FOR PLUGGING WERE BONDED TO TUBES AND HAD TO BE MACHINED. o THE MILLSTONE UNIT NO. 2 SAFETY ANALYSIS REMAINS VALID WITH THE PLUGGING AND SLEEVING CONDUCTED THIS OUTAGE. o THE CORRECTIVE ACTIONS TAKEN (PLUGGING OR SLEEVING) ENSURE TUBE INTEGRITY FOR OPERATION THROUGHOUT CYCLE 8. l l O
_x_ 1986 REFUELING OUTAGE ECT
SUMMARY
a CONCLUSIONS E. P. PERKINS i i I l l i
SUMMARY
& CONCLUSIONS o IMPROVEMENTS IN ECT TECHNIQUES RESULTED IN POSITIVE DEFINITION OF DIST0RTED INDICATIONS LOCATED NEAR THE TOP 0F THE TUBESHEET, AND IDENTIFICATION OF AN INCREASED NUMBER OF FLAWS.
o ESSENTIALLY ~ALL PITS CONTINUE TO BE RELATED TO SLUDGE / DEPOSIT BUILD-UP LOCATED IN THE REGION AB0VE THE TUBESHEETS. o MP2 COUNTERMEASURES APPARENTLY SUCCESSFUL IN REDUCING OR ARRESTING PITTING. ! o BATWING REGION DEFECTS ANOMALOUS, APPARENTLY ISOLATED OCCURRENCE IN THREE TUBES. o DENT PROGRESSION MINIMAL, EXPECT COMPLETE ARREST IN NEAR ! FUTURE AS A RESULT OF COUNTERMEASURES INCLUDING THOSE LISTED AB0VE. o WITH THE PLUGGING AND SLEEVING CONDUCTED THIS OUTAGE, THE MILLSTONE UNIT N0. 2 STEAM GENERATORS REMAIN IN CONFORMANCE WITH THE SAFETY ANALYSIS. o THE TESTING, EVALUATION AND CORRECTION CONDUCTED THIS OUTAGE ENSURES THAT SG TUBE INTEGRITY WILL BE MAINTAINED THROUGH CYCLE 8 OPERATION AT MILLSTONE UNIT NO. 2.
b Ob MEETING
SUMMARY
DISTRIBUTION PWR PROJECT DIRECTORATE #8 Docket File NRC PDR L PDR PBD#8 Rdg AThadani PKreutzer OELD EJordan BGrimes ACRS-10 NRC Participants GBrown-ACRS CYCheng DCrutchfield DJaffe LMarsh GStaley , Mdegner RWright}}