ML20107J814

Submits Response to GL 94-03, Intergranular Stress Corrosion Cracking of Core Shrouds in Bwrs

ML20107J814
Person / Time
Site:	LaSalle
Issue date:	04/15/1996
From:	Querio R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-94-03, GL-94-3, NUDOCS 9604250271
Download: ML20107J814 (25)

Text

{{#Wiki_filter:-- .c Commonwealth IMison Corapany lasalle Generating $tation 2601 North list Road Marseillen 11.613 Il 'n57 T(1 HIV3574761 April 15,1996 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555

Subject:

LaSalle County Nuclear Power Station Unit 1 L1R07 Core Shroud Inspection Results NRC Docket No. 50-373

References:

1. BWRVIP document GENE-523-113 0894, BWR j Core Shroud Inspection and Evaluation Guidelines, dated September 1994. 2. Letter from Mr. G. G. Benes (NLA) to USNRC dated October 18,1995. The above References piovided Comed's response to Generic Letter 94-03, "Intergranular Stress Corrosion Cracking of Core Shrouds in Boiling Water Reactors". As indicated in our response (and required by the Generic Letter), we committed to providing the NRC with our core shroud inspection results within 30 days from the completion of the inspection. Attached is the Core Shroud Inspection Results for the LaSalle 1, Seventh Refuel Outage (L1R07). The Core Shroud inspection for L1R07 was completed on March 16,1996. 4 f poc 0 00 { U h P A Unicom Connuny I{

9 If there are any questions or comments concerning this letter, please refer them to me at (815) 357 6761, extension 3600. Respectfully, 4f6 9S v44 R. E. Querlo Site Vice President LaSalle County Station Enclosure cc: H. J. Miller, NRC Region lil Administrator P. G. Brochman, NRC Senior Resident inspector - LaSalle D. M. Skay, Project Manager - NRR - LaSalle F. Niziotek, Office of Nuclear Facility Safety - lDNS Central File i I i J 250002 4 u

k Response to Generic Letter 94-03

References:

1. BWRVIP document GENE-523-113-0894, BWR Core Shroud ) Inspection and Evaluation Guidelines, dated September 1994. 2. Letter from Mr. G.G. Benes (NLA) to USNRC dated October 18, 1995. Attachments: I 1. Shroud examination sketches plan views and rollout view. 2. Examination Summary Sheet, Report No. RS-02 for the H4 circumferential weld. This document is the LaSalle County Station (LSCS) response j pursuant to the Station's commitment to comply with the i additional reporting requirements of item 3., of USNRC Generic Letter 94-03; "Intergranular Stress Corrosion Cracking of Core Shrouds in Boiling Water Reactors", as that item r.pplies to LSCS i Unit 1. Additional responses to address these rcporting requirements for LSCS Unit 2 have been submittad in accordance with the time frame requested in the Generic Letter. The format of this LSCS response retains the numbering sequence of the Generic Letter. As a utility, Comed is committed to the BWRVIP. Comed has been, and will continue to be an integral part of the BWRVIP. LaSalle County Station will follow the guidance provided by the BWRVIP i with respect to flaw assessment, inspection, and repair options as this guidance is provided, and if it should be subsequently revised. Recortina Recuirements 3. Within 30 days from the completion of the inspection, provide the results of the inspection. The examination plan docketed under the letter of Reference 2 was completed during the seventh refueling outage of LSCS Unit 1. Data collection began on March 2, 1996 with data analysis and review concluding on March 16, 1996. As described in the inspection plan, 100% of the accessible length of welds designated as H3, H4, H5, H6, and H8 were examined using the ultrasonic method. Welds H1, H2, and H7 were not examined, nor did they require examination as part of the Category B (Limited Inspection) described in the Reference 1 BWRVIP document. l 4 1 i

3 For those welds which were inspected, examination of the far (inside diameter) surface was accomplished using standard 45 degree Shear wave, and 60 degree Refracted Longitudinal wave ~ ultrasonic (UT) testing. The near (outside diameter) surface of the welds were examined using the " Creeping Wave" UT method. All ultrasonic data for Welds K3, H4, H5, H6, and H8 was collected using an automated scanner known as the "O.D. Tracker". Eight non-geometric reflectors were recorded during the examination of the H4 weld, which are discussed below. While non-relevant indications and geometric reflectors were detected, no indications of cracking were detected in any of the other welds examined. Accessibility for UT scanning was limited by vessel internal components such as Guide Pins, Core Spray Piping, Low Pressure Coolant Injection Bellows, Jet Pumps, and Jet Pump i Riser Braces. The effective examined length of each weld is listed below as well as the inspected length as a percentage of the total weld length. The_ effective length is the length of weld metal interrogated by all three of the UT beam angles. EFFECTIVE WELD LENGTE EXAMINED i j Weld H3 - 526.7" examined representing 80.83% of the total weld j length. Weld H4 - 506.8" examined representing 77.77% of the total weld length. Weld H5 - 506.8" examined representing 77.77% of the total weld length. Weld H6 - 523.3" examined representing 80.30% of the total weld length. Weld H8 - 499.6" examined representing 79.30% of the total weld length. The ligaments into which each effective length was split are represented pictorially (in plan views and in a roll out) for each weld on the sketches of Attachment 1. A conversion factor 4 of 1.81" per degree is applicable to welds H3, H4, H5, and H6 based on a 207.12" outside diameter for the Core Shroud at these elevations. A conversion factor of 1.75" per degree is i - applicable to weld H8 based on a 200.75" shroud outside diameter at the H8 elevation. A summary of the indications detected in the H4 weld follows: i Eight indications were detected by the 60 degree Refracted Longitudinal and/or the OD Creeping Waves during examination of the H4 circumferential weld. The total combined length of the eight indications is 15.2", representing 3% of the examined 2 a

^ 1 length. The longest of the individual indications is 2.72' long. The depth of the indications does not exceed .60". Ultrasonic data shows that three of the eight indications are OD connected, i none of the eight are ID connected. Visual examination of one ~ indication confirmed that it was open to the OD of the Shroud. (Examination Summary Sheet, Report No. RS-02) i provides a detailed summary of the H4 weld examination and the locations and sizes of all of the indications. s An evaluation of the indications and the unflawed areas of the H4 4 I circumferential weld was completed using the LEPM approach recommended in the reference 1 BWRVIP document. Areas which were i inaccessible for examination were assumed to be flawed through wall. The eight indications were assumed to be IGSCC and a crack j growth rate of 5x10-5 inches / hour was applied for a 24 month 4 operating cycle. The results of the evaluation indicate that the ) H4 weld continues to meet the required normal / upset and j emergency / faulted condition safety factors with significant margir.. This evaluation and associated calculation (NED-C-MSD-035, Revision 00) is on file at LaSalle County Station. In conclusion, the LSCS Unit 1 Core Shroud has been examined during the seventh refueling outage in accordance with the l inspection plan of Reference 2, using the best available industry methods and technology. A small number (3% of the examined i length) of indications were detected on the H4 circumferential weld. These indications have been evaluated as IGSCC using the applicable BWRVIP guidance and found to be acceptable for at least one 24 month fuel cycle. While non-relevant indications and geometric reflectors were detected, no crack like indications 3 were detected in any of the other welds examined. i i 5 I 4 1 i 3 i f

4 e O D 4 i ATTACHMENT 1 ( SHROUD SKETCHES i ') 'N.' l

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~ l .( ATTACHMENT 2 i (-. WELD H4 EXAMINATION

SUMMARY

SHEET 1 i i 1 i 4 k 'l f i 1 2 i i 1 d' l r -.

I EXAMINATION

SUMMARY

SHEET REPORT NO.: Y GE Nucleu Er.emy ._as-ot - PROJECT:_.LaSalle Unit i P 8tOCEDUREL._1JT LAS403V4 REV 0 FRR: _N/A. L1R07 - NML _ _ _RA_ __ SYSTEM:_ CORE.SBROUD ,, 3_. ,,yL,,3 p,,,,_g,3 _N/A WELD NO.:_R4 RA CONFIGURATION:_SHELL _SBELL N/A REVt._N/A FRR: .N/A EXAMINER:._.CJACKEAN LEVEL: J1 O MT O PT G UT O VT EXAMINER:._C VANHECKE LEVEL: _11 S CIRCU'er.RENTIAL ^ D ME: EXAMINER:_E.SWITZER LBULLEN. LEVEL:J111L_. O LONGS FUDINAL 0 OTHER RA DATA SHEET NO.(S): _DS42 CAL SHEET NO.(S):_cs-04 .CS45 _CS-06 During the Ultrasonic examination of the above refe enced weld, eight (8) non-geometric indications were recorded by the Smart 2000 System utilizing a Tri-modal search unit comp sed of 45* shear wave, OD creeping wave (80*RL) and a 60* refracted longitudinal (60*RL) wave. 1 'Diese indications have the following pararneters: Indication Distance from Lug Total Flaw Distance Side of Surface Search [ Number Vessel 'O' Set length Depth from weld Weld Connection Unrt 1 35.79*-36.89* 4 1.1' 2.8" Lower OD 60*/ODCR 2 110.47*-111.57' 12 1.1* .50" Lower 60*/ODCR 3 298.58'-300.08' 31 1.5* 1.1 ' Lower OD 60*/ODCR j 4 302.06'-302.86* 31 .8* .90* Lower OD 60*/ODCF 5 328.38'-329.58' 34 1.2' .60" Lower 60*/ODCh 6 341.76*- 343.06* 35 1.3' 40" Lower 60' 7 343.95*-344 E5' 35 .9' .50" Lower 60*/ODCR 8 161.96*-162.46' 17 .5* .80" Lower 60'/ODCR Total flaw length is 8.4' or 15.2". The conversion factor for linear units is 1.81* per degree.

• Flaw depth does not exceed M'4 of t or.60*

Total effective exam area was in or 506.8*. This represents 77.77% of the weld length. Effective coverage is the area interrogated by all three bean,as.es.100% of all accessable areas were examined. Access was limited due to the proximity of Guide Pins, Core Spray downcomers and LPCI bellows. This examination was performed from the lower shroud shell side only, due to Jet Pump riser brace interference. Indication # 1,3 and 4 are OD connected flaws as confirmed by UT. Indication # 1 was also confirmed by Visual. Indication # 2 a visual examination was performed and could detect no abnormal condition. Indications # 2,4,5,6,7 and 8, the weld crown geometry prevents the search units from scanning over the indication, therefore OD confirmation could not be determined. Effective Exam Area: 4.1* to 39.1',55.1' to 129.1',145.1* to 168.t*,184 ;* to 309.1* and 325.1* to 348.1* 1 Non-relevant indications and weld geometry were also recorded. WM ~2~ A22 7'- f & D gAfa ff _- g_ _ g g SuMMARYSY LEVEL DATE sMAo REVIEWED BY LEVEL DATE [.I J5~ Il 8 /IN4 PAGE 1 OF:_21_. ( GE REVIEWED SY LEVEL DATE UTIUTY REVIEWED 8Y DATE

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SUMMARY

NO.: R S-02 WELD No.: H-4 SEARCH UNIT:_ so* a eo INDICATION NO.: 8 PAGE: 11 OF: It

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