Development of the EC Loose Parts Signal Detection & Characterization Technique

Transcription

1 Development of the EC Loose Parts Signal Detection & Characterization Technique K.M.MIN 1, T.E.CHUNG 1, J.A.PARK 1, D.J.GO 1, M.H.JUNG 2 1. Universal Monitoring & Inspection Inc. ( 2. Korea Hydro & Nuclear Power Co. Ltd. ( 1

2 CONTENTS Introduction & Purpose What is Loose Parts? LP Presented in the EPRI G/L Rev. 7 Development for the LP Detection Technique and Strategy Methodology Site EC Data Review for LP Detection Review & Results LP Detection & Characterization Tech. Development Flow Chart for the LP Detection & Characterization Conclusions 2

3 INTRODUCTION What is Loose Parts (Foreign Objects)? Foreign Objects Any object not part of a system or component per design. Including loose items that have the potential to cause damage to systems and components - By John Gay, R. Brooks Associates, Inc. Foreign Objects Pieces of material located within the SG where it does not belong. The material could have originated from outside of the SG or from within the SG and could be metallic or non-metallic. - EPRI SG G/L Rev. 7 3

4 INTRODUCTION LP Presented in the EPRI G/L Rev. 7 Additionally, this document recognizes the improved performance of new SG tubing materials in the absence of foreign objects and in the presence of good chemistry controls.

5 INTRODUCTION LP Presented in the EPRI G/L Rev. 7 Historical possible loose parts are examined through the area of interest, Peripheral tubes, including tubes adjacent to no-tube lane regions, are included or added to a sample plan or considered a separate sample plan when there is reason to expect that loose parts are present or were introduced into the SG secondary side. Loose part wear damage mechanism is included in QDA practical examination, rev. 7

6 PURPOSE Development for the LP Detection Tech. & Strategy Newly employed inspection planning wrt the SGMP Need screening and surveillance methodology for the loose parts inflow esp. to the unexpected free span area Potential for the unexpected SG tube degradation due to the loose parts Urgent to develop loose part indication detection and characterization technique Need for the Eddy Current inspection guidelines and its revision Improvement of the SG tube eddy current confidence level

7 METHODOLOGY Data Review OPR 1000 Model (Refurbished CE Sys.80 Model) & W Model F SG Tube ISI & PSI Data First Screened Bobbin Coil Data and Confirmed by MRPC Data Comprehensive and Integrated Detection and Characterization Methodology for PLP and its affected indication Categorized 8 Cases

8 W Model F SG : FDB Signals W/O DEP OPR1000 SG : FDB Signals W/O DEP

9 Cat. 1 : W_F_TTS_PLP(F)_NDD Bobbin : DEP : CH. 7 (20kHz Diff.) NDD : CH. 3 (300kHz Diff) MRPC : PLP : CH. 9 (10kHz Panc.) Mag. Mat l, Upward NDD : CH. 5 (300kHz +PT)

10 Cat. 2 : W_F_TTS_PLP(NF)_NDD Bobbin : DEP : CH. 7 (20kHz Diff.) NDD : CH. 3 (300kHz Diff.) MRPC : PLP : CH. 9 (10kHz Panc.) Non Mag. Mat l, Downward Easily Increased Freq. NDD : CH. 5 (300kHz +PT)

11 Cat. 3 : W_F_FDB_PLP(F)_LPI Bobbin : DEP : CH. 7 (20kHz Diff.) DFI : CH. 3 (300kHz Diff.) MRPC : PLP : CH. 9 (10kHz Panc.) Mag. Mat l, Upward LPI : CH. 5 (300kHz +PT)

12 Cat. 4 : O_1000_BPC_PLP(F)_NDD (1) Bobbin : DEP : CH. 7 (20kHz Diff.) NDD : CH. 3 (300kHz Diff.) MRPC : PLP : CH. 9 (10kHz Panc.) Mag. Mat l, Upward NDD : CH. 5 (300kHz +PT)

13 Cat. 4 : O_1000_BPC_PLP(F)_NDD (2) Bobbin : DEP : CH. 7 (20kHz Diff.) NDD : CH. 3 (300kHz Diff.) MRPC : PLP : CH. 9 (10kHz Panc.) Mag. Mat l, Upward NDD : CH. 5 (300kHz +PT)

14 Cat. 5 : O_1000_BPC_PLP(F)_LPI (1) Bobbin : DEP : CH. 7 (20kHz Diff.) DFI : CH. 3 (300kHz Diff.) MRPC : PLP : CH. 9 (10kHz Panc.) Mag. Mat l, Upward LPI : CH. 5 (300kHz +PT)

15 Cat. 6 : O_1000_BPC_PLP(F)_LPI_C(1) Bobbin : DEP : CH. 7 (20kHz Diff.) DSI : CH. 3 (300kHz Diff.) MRPC : PLP : CH. 9 (10kHz Panc.) Mag. Mat l, Upward LPI : CH. 5 (300kHz +PT)

16 Case 6 : O_1000_BPC_PLP(F)_LPI_C(2) Bobbin : DEP : CH. 7 (20kHz Diff.) DSI : CH. 3 (300kHz Diff.) MRPC : PLP : CH. 9 (10kHz Panc.) Mag. Mat l, Upward LPI : CH. 5 (300kHz +PT)

17 Cat. 6 : O_1000_BPC_PLP(F)_LPI_C(3) Bobbin : DEP : CH. 7 (20kHz Diff.) DSI : CH. 3 (300kHz Diff.) MRPC : PLP : CH. 9 (10kHz Panc.) Mag. Mat l, Upward LPI : CH. 5 (300kHz +PT)

18 PLP Detected at the Unexpected Area (F/S) Need Sustaining Surveillance!! REVIEW AND RESULTS Cat. 7 : O_1000_FS_PLP(F)_NDD (1) Bobbin : DEP : CH. 7 (20kHz Diff.) NDD : CH. 3 (300kHz Diff.) MRPC : PLP : CH. 9 (10kHz Panc.) Mag. Mat l, Upward NDD : CH. 5 (300kHz +PT)

19 Cat. 7 : O_1000_FS_PLP(F)_NDD (2) Bobbin : DEP : CH. 7 (20kHz Diff.) NDD : CH. 3 (300kHz Diff.) MRPC : PLP : CH. 9 (10kHz Panc.) Mag. Mat l, Upward NDD : CH. 5 (300kHz +PT)

20 PLP Retrieved or Migrated, PLP Not Detected, VOL(PLP Affected) Detected Need History Review & Sustaining Surveillance!! REVIEW AND RESULTS Cat. 8 : O_1000_BPC_INF_DSI Bobbin : INF : CH. 7 (20kHz Diff.) DSI : CH. 3 (300kHz Diff.) MRPC : INF : CH. 9 (10kHz Panc.) VOL : CH. 5 (300kHz +PT)

21 Cat. X : O_1000_BPC_?_?

22 Areas of Interest (FDB, TTS, TSP, F/S) Chart CH.7 (20kHz Diff, Vert) Signal Distorted? Yes Confirm Flaw Liz. CH.3 (300kHz Diff) No No DEP Not Found Confirm Tube Loc. Outer Periph. or Not Flow Chart for the LP Detection & Characterization (1)

23 Report - Sup. P1, DSS - 1, DFS 7 : DEP No Signal Amp. Varied? Yes Yes Review History Being Recorded? Yes No Report - In P1, DSI - Out of 1, DFI 7 : DEP Flow Chart for the LP Detection & Characterization (2)

24 @CH. 7: DEP MRPC Retest 1. Indication Found? 5 & 9 2. Indication Not Found? 9 Flow Chart for the LP Detection & Characterization (3)

25 CONCLUSIONS 1. Loose parts located on the secondary side of the SG tubes are detrimental to the structural integrity of the SG tubes. 2. In order to timely detect LP indications it is imperative to implement effective measures for LP detection. 3. By virtue of high inspection rate and effectiveness, bobbin coils have been favored in the ECT field. 4. The methodology to detect and categorize loose part is presented and demonstrated by analyzing site bobbin coil EC data. 5. The procedure and flow chart for resolving loose part signal and defects are presented as well.

26 REFERENCES 1. EPRI, SGMP: Pressurized Water Reactor Steam Generator Examination Guidelines, Rev Sang-Yoon Kim et. al, EC Signal Analysis and Review of Foreign Materials on Inconel Alloy Tubes, 2008 KSNT Fall Conference Proceedings 3. Robert E. Marefka, Secondary Side Foreign Object Issues Update, 2005 EPRI SG Workshop Proceedings 4. John Gay, Summary of Foreign Object Experiences, 2004 EPRI SG Workshop Proceedings 5. V. S. Cecco et. al. Eddy Current Testing, AECL 6. ASNT, NDT Handbook, Vol. 5 Electromagnetic Testing, 3 rd Ed.

27 QUESTIONS? Thank You! Kyong Mahn, MIN Manager, Universal Monitoring & Inspection Inc. 27