E-Mailed Request for Information for Byron Station, Unit 2, on 03/27/19 (DRS-M.Holmberg)| ML19087A148 |
| Person / Time |
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| Site: |
Byron  |
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| Issue date: |
03/27/2019 |
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| From: |
NRC/RGN-III |
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| To: |
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| References |
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| Download: ML19087A148 (3) |
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[Table view] |
Text
Part B Items (Onsite) - NRC information Requests (March 27, 2019) - ISI Byron U2
- 1) ITEM B.1 - requested documents for the following selected weld activities:
A. Welding activity completed during prior outage.
Work Order Code Class Description 01952003-01 2 (2CV8351) Install Additional Isolation Valve downstream of 2CV8350 per EC040564 B. Welding activity scheduled to occur during the current outage.
Work Order Code Class Description 01380459-01 2 2SIJ7A, CM 2SIJ7A-3/4"-
Fab/Install SI Vent in 2A Suction per EC 381903
- 2) ITEM B.2 Documents - ISI related corrective actions AR/IR Description/Topic Number 04097807 01/27/2018 CORROSION ON 2A DG JACKET WATER COOLER CHANNEL HEAD 04062274 2SI8905D - LOOP 4 HOT LEG SI CHK VLV 04137953 05/15/2018 CORROSION ON SX RISER VALVE PIPING 04058120 2RC8037C BODY/BONNET INACTIVE LEAK 04059080 BORIC ACID LEAK ON 2RC8037A 04059953 ACTIVE BORIC ACID LEAK ON 2SI051 04059979 ACTIVE BODY TO BONNET LEAK ON 2SI8905D 04064624 ACTIVE LEAK ON 2CV8368B 04085285 RCS LEAK RATE EXCEEDED ACTION LEVEL 3 04085629 U-2 RCS LEAK RATE DEVIATION ACTION LEVEL II UNIT 2 RCS LEAK RATE CALCULATION EXCEEDED 04087635 PARAMETERS 04090712 RCS LEAK RATE ACTION LEVEL 2 04121830 SX LEAK ON JACKET WATER COOLER DURING SX FLUSH UNEXPECTED ALARM - U-2 CONTAINMENT LEAK 04209055 DETECTION HIGH 04222319 RCS LEAK RATE EXCEEDED ACTION LEVEL 3 04230553 POTENTIAL INACTIVE LEAK ON 2SX03B LINE U2 LOOSE PARTS IMPACT NOISE MULTIPLE ALARMS 04155764 RECEIVED 01326215 BBS-10 Small Bore Class 1 Weld Actions 02704898 2SX035 Leak ADAMS Accession Number: ML19087A148
- 3) Item B.3- Documents for Components with Relevant Indications Component AR No or Letter Supporting docs 10/12/2017 - NDE - LINEAR Provide a copy of Detailed INDICATION OBSERVED AR 04062252 with construction/fabrication DURING EXAM all corrective drawing for affected action component and associated assignments piping drawing.
(CAs). Nondestructive Exam report(s) and completed corrective actions for AR and site procedure with acceptance criteria that were applied for this issue.
10/12/2017 B2R20 M4 NDE Provide a copy of Detailed construction/
- LINEAR INDICATION AR 04062274 with fabrication drawing for OBSERVED DURING all CAs. affected component and EXAM associated piping drawing.
Nondestructive Exam report(s) and completed corrective actions for AR and site procedure with acceptance criteria that were applied for this issue.
Unit 2 Containment Liner Byron Letter dated Provide ARs and CAs Corrosion- January 18, 2018- associated with these liner Based on ultrasonic BYRON 2018- pits as described in your testing, the maximum metal 0002 January 18, 2018 letter.
loss observed on the Byron Station Unit Nondestructive Exam containment liner is 0.103 2 90-Day Inservice report(s) and site procedure at one location. This is the Inspection Report with acceptance criteria only location on the for Interval 3, applied to these degraded containment liner that has Period 3 and areas.
reached 40% metal loss Interval 4, Period from nominal thickness. The 1, (B2R20) Applicable calculations that nominal plate thickness of support the evaluations of the containment liner each degraded areas as is 0.250 thick. The two pits described in your January identified in B2R20 are the 18, 2018 letter.
only locations for Unit-2 that exceed the ASME Code Section Xl Subsection IWE acceptance criteria of 10%.
The pit at D2 Location 1 is 27.2% metal loss from nominal thickness and the pit at D2 Location 3, mentioned previously, resulted in 41.2% metal loss.
- 4) Item B.4- Updated Schedules - NDE and Welding Activities as identified in A.1 of Request Letter. Specifically, include the inspection priority items selected below and a current copy of the applicable procedures:
Week of 4/8/19 (M- F) and Week of 4/15/19 (M - F) - NDE Activities UT, (Cat R-A, R1.11.3) 3 of 7 FW welds - (e.g. FW03DA-16/C15, 16, 19, 20, 21, 22 or 26). Procedure - EXE PDI-UT-1 Ultrasonic Examination of Ferritic Pipe Welds in Accordance with PDI-UT-1.
UT, (Cat B-B, Item B2.40) - SG - Stub Barrel Channel Head Weld - 2RC BA/SGC-01. Procedure - EXE-ISI-210 - Manual Ultrasonic Examination of Vessel Welds.
PT, (Cat C-B, Item C2.21) - Feedwater Nozzle Weld - 2RC-01-BA/SGN-02 Procedure - ER-AA-335-002 - liquid penetrant examinations.
PT, (Cat C-C, Item C3.20) - Closure Plate 2AB-37 Weld - 2RH02AA-8/C47 Procedure ER-AA-335-002 - liquid penetrant examinations.
Thursday- 4/11/19 Thermal Sleeve Wear Measurement/Examination- Work order and Procedure -
LCM 16-0002.
Friday & Saturday & Monday 4/12, 13 & 15 of 2019 - BMV Examination Rx Head VE- BMV -2RC02R- Reactor Head Bare Metal visual examination -CC-729 Procedure - ER-AP-335-001 BARE METAL VISUAL EXAMINATION FOR NICKEL ALLOY MATERIALS, R6 04/15/19 - Monday (Note Sunday 4/14/19 at 1600 Start)
Welding - WO 01380459 CM 2SIJ7A-3/4"- FAB/INSTALL SI VENT IN 2A SUCT PER EC 381903 and applicable welding procedures (e.g. 8-8-GTSM, or 1-1-GTSM PWHT.