ML20209J138
| ML20209J138 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 01/14/1987 |
| From: | Stefano J Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20209J145 | List: |
| References | |
| NUDOCS 8702060221 | |
| Download: ML20209J138 (16) | |
Text
{{#Wiki_filter:, m January 14, 1987 Docket No. 50-341 l LICENSEE: Detroit Edison Company FACILITY: Fermi-2
SUBJECT:
MEETING SilMMARY FOR DECEMBER 11, 1986, MEETING ON MAIN STEAM TURBINE BYPASS FLOW LINE FAILURE On December 11, 1986, members of the NRR staff met with the licensee to discuss failures experienced with the main steam turbine bypass flow line and corrective actions taken by the licensee to rectify the. problems. Enclosure (1) is a copy of the meeting agenda and the slide presentation made by the licensee at the meeting. Enclosure (2) is a list of the meeting participants. Enclosure (3) documents the NRR's staff's position and comments expressed at the meeting with respect to actions taken by the licensee to identify the root cause of the l problem, corrective actions taken as of the date of the meeting, and the follow-on surveillances planned by the licensee. The meeting was noticed in the PDR by memorandum dated November 26, 1986. l /S/ John J. Stefano, Senior Project Manager PWR Project Directorate No. 3 Division of BWR Licensing
Enclosures:
As stated cc: See next page 9702060221 870114 PDR ADOCK 05000341 P PDR '/ 4 f y 1 ( BW
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Mr. B. Ralph Sylvia Detroit Edison Company Fermi-2 Facility cc: Mr. Harry H. Voigt, Esq. Ronald C. Callen LeBoeuf, Lamb, Leiby 8 PacRae Adv. Planning Review Section 1333 New Hampshire Avenue, N. W. Michigan Public Service Commission Washington, D. C. 20036 6545 Mercantile Way P. O. Box 30221 John Flynn, Esa. Lansing, Michigan 48904 Senior Attorney Detroit Edison Company Regional Administrator, Region III 2000 Second Avenue U. S. Nuclear Regulatory Commission Detroit, Michigan 48226 799 Roosevelt Road tien Ellyn, Illinois 60137 Mr. Dennis R. Hahn, Chief Nuclear Facilities and Environmental Monitoring Section Office Division of Padiological Health P. O. Box 30035 Lansing, Michigan 48909 Mr. Steve Frost Supervisor-Licensing Detroit Edison Company Fermi Unit 2 6400 North Dixie Highway Newport, Michigan A8166 Mr. Thomas Randazzo Director, Regulatory Affairs Detroit Edison Company Fermi Unit 2 6400 North Dixie Highway Newport, Michigan 48166 Pr. Walt Rogers U. S. Muclear Regulatory Commission Pesident Inspector's Office 6450 W. Dixie Highway Newport, Michigan 48166 Monroe County Office of Civil Preparedness 963 South Raisinville Monroe, Michigan 48161
January 14, 1987 MEETING NOTICE DISTRIBUTION . ocket No: 50-341 NRC Participants NRC PDR Local POR JStefano PRC System RWHouston BWD #3 r/f JTsao ORAS DDanielson, RIII PPAS/TOSB JJacobson, RIII H. Denton BHermann OPA EAdensam D. Mossbura RGlaGrange Attorney, OGC RBernero E. Jordan CENorelius, RIII B. Grimes EGreenman, RIII J. Partlow GWright, RIII Receptionist Project Manager J. J. Stefano E. Hylton bec: Applicant & Service List
\\ (/n ?/d I AGENDA Objective of Presentation: The actions and essential facts surrounding the initial reports of leakage on the main steam bypass lines, the corrective actions taken, and the followup measures implemented by Detroit Edison will be the i subject, of this presentation. Detroit Edison believes that the root cause of.the problem has been identified and adequately dealt with. Further, that the bypass lines in their current configtration will support normal operations for the 40 year design life of the plant.
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'l j AGENDA F ( 1. Initial Failtre of the Main Steam Bypass Lines Initial detection of the leakage Determination of Root Cause 2. Modification of the Bypass Lines Industry experience search Consultants and A/E's Synthesis of the modifications NDE performed 3. Post Construction Testing Hopper report on fatigue life Testing program Results of test data analysis 4 Supplemental Testir.g Location of additional strain gages defined Testing program Results of testing 5. Service Life of the Lines Operational modes of the system Extrapolation to a 40 plant life 6. Residual Concerns Relative to the Bypass System 7. Line Monitoring and Contingency Plans 8. Summary L
i' MS BYPA SS J DUM P VALVE LJ f l' M.S. BYPASS jjl HUMP VALVE N ) f CON DE NS E R h 1 . CON N ECT IONS f /w
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) s M.S. BYPASS DUMP VALVE Gl4 SNUBBER UI G21 SNUBBER go GIS SNUBBER [ e TWO (2) CRACKS ON PIPE \\ GIO SOLID l SURFACE INVICINITY OF NE j.' (UPPER) SHEAR WG GO9 RIGID l! e LOWER WEST SHEAR LUG CRACKED / l' e THREE (3) SHEAR I.U6 RETAINERS / GO8 RIGID l' CRACKED 3 620 SNUBBER l, Gl9 SNUBBER / 0 Gil RIGID h . CRACK ON PAPE SURFACE F NEAR UPPER NE SHEAR WG {l = UPPER NE SHEAR LUG GM SNUBBER [ RFTAINER CRACKED \\ GO6 RIGID GOS SOLip e SE LUG RETAINER MINOR CRACK AT BASE GIS SNUBBER E
- CRACK ON PIPE SURFACE 2 (
- THREE (3) SHEAR LOG j
HEAR WEST SHEAR LUG j ') RETAINERS CRACKED L GC4 SOLID GO2 f OLID i N Gi sNosBER S'2 "' S'o s \\ 30 Gol GUIDE GOS SOLip Gl5 SNUBBER /. CONDENSER ). CONNS. N 24 N WEST MAIN STEAM BYPASS LINE I, 24.- l -Q ORIGINAL CONFIGURATION 1 1 l>
1 d M.S. BYPASS GO6 SNUBBER DUMP VALVE g+ V GO7 SNUBBER i GIO SNUBBER d' g Go3 SPRIMG Go4 SPRING . TWO (2) LRACKS ON PIPE SURFACE EMINATING FROM E SHEAR LUG so9 SNUBBER p6 )
- CRACKS ON PIPE SURFACE
' g I gel PROJECTING UNDER PIPE CLAMP o j' (@ NE 4 SW SHEAR LUGS) 3 Gl2 SPRING d. GOS SWBBER N. 3 I
- f. CONDENSER 2t GO2 SNUBBER s
CONNS. j-GOS RIGip o Gol SNUBBER I i EAST MA.N STEAM 3YPASS LINE i ORIGINAL CONFIGURATION I
O l LUG RETAINER g we y PIPE WALL k t _ / % ~ fy -/ 9 l INTERGAL LUG ATTACHMENT
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- 4 PUMP VALVE G24 SNUBBER O,I gio soggp
% Gl4. SNUBBER
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GO9 RIGID f Gil RIGID l / / e FILLET WELD - REAR BRKT. 4 Gl9 SNUBBER / To TS CRACKS I . THRU CRACK ON HGR. i CLAMP EAR 4 o3 / . CRACK INITIATING ON So, ADJACENT CLAMP EAR hk 4 GO8 RIGID ~ \\ GO6 RIGID l G20 SNUBBER G23 RIGID Gl7 SNUBBER i o l GO2 SOLID M G12 RIGID 30' \\ GIG SNUBBER \\ G03 SOLID i Gol GulDE i l \\ Gl5 SNOBBER
- d. CONDENSER s
i CONNS. ' 'g-WEST MAIN STEAM BYPASS UNE er g MODIFIED CONFIGURATION 4
- REMOVED PER TMR-86-139 REV. A
d M.S. BYPASS g DUMP VALVE o Gl4 SNUBBER I GO4 SPRING f I Gl2 SPRING d' 3 G UBBER j
- d. CONDENSER
's 2e
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S GOS R1GID Got SNUBBER - x, _AST MA N STEAM 3YPASS LINE
- REMOVED PER TMR-86-139 REV. A MODIFIED CONFIGURATION
1 M t g E T A a Q R 0 W b 0 i 1 O a r t t L a s D i F D d e m v o a r r t e f 0 S a s 8 D b d S O e d t A e e a d nl M r i u o L c c l e n a R O C 06 E N s I L V R e EP N I i l ) Id 1 0 4 I ( o. b A e R T l I i S 02 G N I T A 0 0 N 0 5 R 1 E -af 5&G eM. T L A 1!, I i I'q!I lilIf li; l i ;.
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i i i 1 7 I / J i s f l' i ~ ,i 'ds. ,ei TOP CLAMP EAR FOUND CRACKED j i ) AND HELD IN PLACE ONLY BY l / r SNUBBER PIN s i j i VIEW LOOKING WEST U BOTTOM CLAMP EAR 15 CRACKED, BUT NOT ALL THE WAY THROUGH. ALSO SNUBBER FORWARD BEARING WAS FOUND FROEEN, WOULD NOT MOVE HANGER N30-3619-Gl9 MECHANICAL SNUB 8ER
REAR BRKT. CRACK ~ l /[LG. 4'L CRACK ~k[LG. INTO T.S. BASE MAT I I I d 2
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g kl STEEL B ~~- ~~ r -Y l -{, caAcx~ I" LG J CRACK ~l"LG. VIEW "A-A" O O O O O OO LOOKING WEST r, 1 l B u OA [ i oo o o o o o CRACK ~'/.*LG. 2 _t:
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o o o o o p K rose A / j sTeEt VIEW LOOKING SOUTH REAR BRKT. u u VIEW B-B LOOKING EAST HANGER N30-3619-Gil l AXIAL RIGID STRUT t
The mainsteam bypass lines are acceptable for the 40 year normal operating life of the Permi plant due to the following:
- 1. The lines meet or exceed the e mperical requirements for avoid-ance of acoustically induced pipe wall cracking.
- 2. The lines meet or exceed the reg-uirements of the ANSI B 31.1 code to which they were designed.
- 3. Two separate rigorus evaluations, which utilize two different methods, predict 100 days of cumulative life in the least desireable range of valve positions.
- 4. The pipe wall strains measured since the lines were modified show signif-icantly reduced pipe wall strain are present.
- 5. The bypass line hangers and supports and snubbers meet or exceed the req-ments of the ANSI B 31.1 and AISC codes to which they were designed.
- 6. The least desireable valve position range is not a hold point in the normal plant operating proceedures.
- 7. The lines have operated for a peroid of 8 cumulative days in the valve position range of interest with:
k a) Minor loosening of clamp nuts, which was resolved. b) Some snubber clamp and one instance of hanger tube steel cracking which could have occurred during operation of the original 3/8" Wall line. Also, an analysis of the line shows that the supports could have been removed with no detremental effects.
p ENCLOSURE (2) DECEMBER 11, 1986 MEETING WITH DECO RE: MAIN STEAM TURBINE BYPASS LINE FLOW-INDilCED VIBRATION NAME OPGANIZATION John Stefano NRC - Project Manager R. Wa.vne Houston NRR - Division of BPR Licensinn John Tsao NRR - DRL/Ep Thomas Randazzo Detroit Edison Frank Agosti Detroit Edison Duane Danielson NRC - RIII John Jacobson NRC - RIII J. J. Harrison NRC - RIII, Chief Eng. Rranch Pob Hermann NRC - DRL/Section Chief, EB E. G. Adensam NRC - DnL/pWD-3 Stephanie Murphy NIRS - 1616 P. St. NW, #160 R. G. La Grance NRC - DBL /ER l T. Vang Stone 1: Webster Steve Frost Petroit Edison n troit Edison Gene Preston e Lawrence Simpkin Detroit Edison Pavid Spiers Detroit Edison John Conroni Detroit Edison David Hopper Hopper & Assoc. n troit Edison Johseph Cohen e B
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