ML11356A024
| ML11356A024 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 03/01/2010 |
| From: | Entergy Corp |
| To: | Atomic Safety and Licensing Board Panel |
| SECY RAS | |
| Shared Package | |
| ML11356A002 | List: |
| References | |
| RAS 21600, 50-247-LR, 50-286-LR, ASLBP 07-858-03-LR-BD01 | |
| Download: ML11356A024 (35) | |
Text
RIV000015 Submitted: December 22, 2011 NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 1 OF 35 Flow Accelerated Corrosion Program I Procedure Contains NMM REFLIB Forms: YES D NO 1Z1 Effective Procedure Owner: James P. Miksa Governance Owner: Oscar Limpias Date
Title:
Mgr, Program&Comp.
Title:
VP Engineering 3/1/2010 Site: PLP Site: HQN Exception Site Site Procedure Champion Title Date*
ANO Robert Beaird Manager, P & C, Acting N/A BRP GGNS Matthew Rohrer Manager, Programs & Components IPEC Richard Burroni Manager, Programs & Components JAF Patrick Scanlan Manager, Programs & Components PLP James P. Miksa Manager, Programs & Components PNPS Steven Woods Manager, Programs & Components RBS Chris Forpahl Manager, Programs & Components VY George Wierzbowski Manager, Programs & Components W3 Rex Putnam Manager, Programs & Components N/A NP HQN Luis Terrazas Manager, P & C, Acting Site and NMM Procedures Canceled or Superseded By This Revision Process Applicability Exclusion: All Sites: D Specific Sites: ANO D BRP D GGNS D IPEC D JAF D PLP 1Zl PNPS D RBS D VY D W3 D NP D Change Statement Revision 3 is being issued to incorporate procedural enhancements Revision 3 is being issued to incorporate process enhancements resulting from programmatic weaknesses identified at AN0-2. Reference CR-AN0 2009-319 Changes to Section 1, [1], [2], [3] and [5] provide clarification and further define the Purpose statements.
Change to Section 2, [3] was the removal of Reference [3] to Section 6, Interfaces [1 0]
Change to Section 2, [18] updates the procedure to the latest FAC Qualification Card Change to Section 2.2, [1] and [2] added a Site Specific Reference section to this procedure Change to Section 3, adds [3] CHECWORKS Software definition Change to Sections 3.0 [19] editorial Change to Sections 4.1 [3] and 4.2 [1], [9] and [12] editorial Changes to Section 4.4 [1] thru [5], [7] thru [1 0], [13], [16], [24], [26] and [27] editorial clarification Changes to Section 4.6 [1], [2] and [4] provides editorial clarification Changes to Sections 5.2 [1] thru [5] and [7] provides enhanced guidance to the Analysis/Pre-examination process Changes to Section 5.3 [4] editorial Change to Section 5.6 Added Note to this Section that specifies personnel qualification requirements.
Change to Section 5.6 [2] provides enhanced guidance to screen criteria Change to Section 5.6 [1] provides additional guidance and criteria for FAC maintenance and update Change to Section 5.6 [3] thru [11] editorial Change to Section 6.0 [9] adds NSAC 202L as an Interface document
- Requires justification for the exception:
IPEC00214478
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 2 OF 35 Flow Accelerated Corrosion Program TABLE OF CONTENTS Section 1.0 PURPOSE ................................................................................................3
2.0 REFERENCES
.........................................................................................3 3.0 DEFINITIONS ...........................................................................................5 4.0 RESPONSIBILITIES ................................................................................9 5.0 DETAILS .............................................................................................. 15 6.0 INTERFACES .........................................................................................28 7.0 RECORDS ..............................................................................................28 8.0 SITE SPECIFIC COMMITMENTS .......................................................... 29 9.0 ATTACHMENTS ..................................................................................... 30 ATTACHMENT 9.1 GUIDANCE ON PARAMETERS AFFECTING FAC ............................ 31 ATTACHMENT 9.2 FLOW ACCELERATED CORROSION PROGRAM ATTRIBUTES .......... 34 ATTACHMENT 9.3 WALL THINNING EVALUATION PROCESS MAP ................................. 35 IPEC00214479
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 3 OF 35 Flow Accelerated Corrosion Program 1.0 PURPOSE
[P-33641- P-33643], [P-33645], [P-33714- P-33719], [P-33730], [P-35351], [JAFP-87-0737], [JPN 051], [IP3-87-055Z], [IPN-89-044], [BECo-89-107], [FVY-89-66], [FVY-87-94], [FVY-87-121], [P-1079],
[P-35269], [P-24444], [P-15802], [P-15803], [P-16557], [P-20303], [P-22888], [RCL 01038934-01],
[CMT891 015777]
[1] The purpose of this procedure is to implement a common approach to establish programmatic control, updating, and documenting Flow-Accelerated Corrosion (FAG) programs for standardization at Entergy's nuclear plants.
[2] The objective of the FAG program is to predict, detect, monitor and minimize degradation in single and two-phase flow piping (safety and non-safety related systems) to prevent failures while enhancing plant safety and reliability.
[3] This procedure provides criteria and methodology for selecting components for inspection, performing inspections, evaluating inspection data and disposition of results, sample expansion requirements, piping repair /replacement criteria, program responsibilities and documentation requirements.
[4] This procedure may be used as a guide for evaluating systems and components that are not included in the FAG program.
[5] The frequency of the activities described in this document shall be on a refuel outage basis, unless otherwise noted. However, in some cases, online or mid-cycle inspection and evaluation may be performed.
2.0 REFERENCES
2.1 General References
[1] NRC Generic Letter 89-08, "Erosion/Corrosion Induced Pipe Wall Thinning".
[2] NUREG-1344, "Erosion/Corrosion-Induced Pipe Wall Thinning in U.S. Nuclear Power Plants."
[3] EPRI Technical Report, TR-106611, "Flow-Accelerated Corrosion in Power Plants"
[4] NRC Bulletin No. 87-01, "Pipe Wall Thinning."
[5] Erosion/Corrosion in Nuclear Power Plant Steam Piping: Causes and inspection Program Guidelines. EPRI, April 1985. NP-3944.
IPEC00214480
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 4 OF 35 Flow Accelerated Corrosion Program 2.0 cont.
[6] ANSI 831.1 "Power Piping", (For applicable code year see individual plant FSAR).
[7] EPRI Paper, "Single-Phase Erosion/Corrosion of Carbon Steel Piping", February 1987.
[8] EPRI Paper- "Practical Consideration for the Repair of Piping Systems Damaged by Erosion/Corrosion", dated 10/5/87
[9] Acceptance Criteria for Structural Evaluation of Erosion/Corrosion Thinning in Carbon Steel Piping. EPRI, April 1988. NP-5911.
[1 0] NRC Generic Letter 90-05, "Guidance for Performing Temporary Non-Code Repairs of ASME Code Class 1, 2 &3 Piping".
[11] INPO SOER 87-3, "Piping Failures in High-Energy Systems Due to Erosion/Corrosion", March 1987.
[12] INPO Significant Operating Experience Report (SOER) 82-11, "Erosion of Steam Piping and Resulting Failure", February 1982.
[13] IN 93-21, "Summary of NRC Staff Observations compiled during Engineering Audits on inspections of Licensee E/C Programs", dated March 25, 1993.
[14] EPRI CHUG Position Paper #3, "A Summary of Tasks and Resources Required to Implement an Effective Flow Accelerated Corrosion Program."
[15] EPRI CHUG Position Paper #4, "Recommendations for inspecting Feedwater Heater Shells for Flow-Accelerated Corrosion Damage", February 2000.
[16] CHECWORKS Steam /Feedwater Application, "Guidelines for Plant Modeling and Evaluation of Component Inspection Data", EPRI No. 1009599, Final Report, September 2004.
[17] Entergy Quality Assurance Program Manual
[18] EN Common FAG Qualification Card FTK-ESPP-G00019, "Implementing the Flow Accelerated Corrosion Program".
IPEC00214481
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 5 OF 35 Flow Accelerated Corrosion Program 2.0 cont.
[19] CHECWORKS Steam /Feedwater Application, Version 2.1, EPRI No. 1009600, Final Report, October 2004.
[20] CHECWORKS Steam /Feedwater Application, latest version.
[21] Institute of Nuclear Plant Operations, "Engineering Program Guide, Flow Accelerated Corrosion", EPG-06 2.2 Site Specific References
[1] JAF-SPEC-MISC-03290 Rev.O, "Specification for Evaluation and Acceptance of Local Areas of material, parts and components that are less than the specified thickness."
By REEDY Engineering.
[2] IP3-SPEC-UNSPEC-02996 Rev.O, "Specification for Evaluation and Acceptance of Local Areas of material, parts and components that are less than the specified thickness." By REEDY Engineering.
3.0 DEFINITIONS
[1] Base Line Inspection -An initial wall thickness measurement of a component taken prior to being placed in service.
[2] Basis Document- Program documents that define the scope, attributes, commitments, evaluation reports and predictive models that form the basis of the FAG program (i.e., System Susceptibility Evaluation reports). These documents contain the basis for the plant piping in the CHECWORKS model, the susceptible-not-modeled (SNM) piping and those that are non-susceptible.
[3] CHECWORKS- EPRI Computer Modeling Program used to predict rated wall thinning and remaining life of components degraded by FAG.
[4] Code Minimum Thickness (tmin,Jcodeminl- The minimum required global wall thickness based on hoop stress.
[5] Critical Thickness (t£d!..}- The minimum required wall thickness per code of construction required to meet all design-loading conditions.
[6] Deficient Component - A component identified by examination to be below taccpt wall thickness or projected to be below taccpt wall thickness by the next refueling outage.
IPEC00214482
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 6 OF 35 Flow Accelerated Corrosion Program 3.0 cont.
[7] Degraded component- A component identified as being below the screening criteria that is acceptable for continued operation.
[8] EPRI CHUG- EPRI CHECWORKS USERS GROUP.
[9] Examination - Denotes the performance of all visual observation and nondestructive testing, such as radiography, ultrasonic, eddy current, liquid penetrant and magnetic particle methods.
[1 0] Examination Checklist/ Traveler- A data sheet/checklist developed for components being inspected and may contain but is not limited to the following: tnom, tmeas, Tmin, Screening criteria, component's name, system number, previous data, inspection datasheet number, grid size, examination extent, work order and affiliated minimum wall calculation.
[11] Flow Accelerated Corrosion (FAG)- Degradation and consequent wall thinning of a component by a dissolution phenomenon, which is affected by variables such as temperature, steam quality, steam/fluid velocity, water chemistry, component material composition and component geometry. Previously known as Erosion/Corrosion.
[12] Grid -A pattern of points or lines on a piping component, where UT thickness measurements will be made. Grid may be permanently marked with circumferential and longitudinal grid lines.
[13] Grid Point- A specific location on a piping component, where a UT thickness measurement will be made. Grid points are at the intersections of the circumferential and longitudinal grid lines.
[14] Grid Point Reading - UT reading taken at the intersection of the grid location.
[15] Grid Scan - 100% scans of the area between the grid lines. The lowest measurement in each area is to be recorded as the measured thickness.
[16] Full Scan -scans of 100% of an area, circumference, nozzle, heater segments etc, measuring minimum, maximum and averages thicknesses and approximate location of minimum measured thickness.
[17] Grid Size- The distance between grid points in the circumferential or longitudinal direction. Also called grid space or grid spacing.
IPEC00214483
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 7 OF 35 Flow Accelerated Corrosion Program 3.0 cont.
[18] Initial Thickness (tinitl- The thickness determined by ultrasonic examination prior to the component being placed into service (baseline) or the first ultrasonic examination during its service life. If an examination has not previously been performed on the component, the initial thickness shall be determined by reviewing the initial ultrasonic data for that component. The area of maximum wall thickness within the same region as the worn area (based on the method selected for evaluating wear) shall be identified and compared to tnom* If the thickness is greater than tnom, the maximum wall thickness within that region shall be used as tin it* If that thickness is less than tnom, tnom shall be used as tinit*
[19] Inspection Location -A specific examination location, which may be an elbow, tee, reducer, straight pipe section, etc.
[20] Inspection Outage- the outage during which the component was inspected.
[21] Large-bore Piping- Piping generally greater than 2" nominal pipe size with butt-weld fittings.
[22] Line Scans- piping segments broken into one-foot lengths (Small-Bore pipe).
[23] Minimum acceptable wall thickness (taccotl- Maximum value of axial stress, hoop stress, and/or critical thickness and the piping replacement values of 0.3 tnom for Class1 piping or 0.2 tnom for Class 2, Class 3 and non-safety related piping.
[24] Minimum Measured Thickness (tmeas or tmm}- as identified by ultrasonic thickness examination, the present thickness at the thinnest point on a component.
[25] Local minimum required thickness (talocl- Minimum acceptable local wall thickness as calculated by EN-CS-S-008-MULTl.
[26] Minimum required thickness (ta min}- Minimum required pipe wall thickness based on axial stress (See EN-CS-S-008-MUL Tl).
[27] Next Scheduled Inspection (NSI) -The outage at which an inspection will be performed on a given component.
[28] Nominal Thickness (tnom}- Wall thickness equal to ANSI standard thickness.
IPEC00214484
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 8 OF 35 Flow Accelerated Corrosion Program 3.0 cont.
[29] PASS 1 Analysis - Runs modeled in CHECWORKS that either have no inspection data, an insufficient number of inspections to provide a proper calibration, or where there is no expectation of ever developing a proper calibration.
[30] PASS 2 Analysis - The process of utilizing UT inspection data thickness measurements in CHECWORKS to predict wear and wear rates for components.
[31] Piping Segment- A run of piping that consists of inspection locations which have common operating parameters (i.e., temperature, pressure, flow rate, Oxygen content and pH level).
[32] Predicted /Projected Thickness (t12.Jpred} -The calculated thickness of a component based upon a rate of wear to some point in time (e.g., next refueling, next scheduled examination).
[33] Quadrant Scan - Piping segments divided in quadrants A, B, C, D that are 90 degrees apart and broken into one-foot lengths, or as specified by the FAG engineer.
[34] Qualified FAG Engineer- Individual who has completed the FAG Qualification Card, who participates in the Engineering Support Personnel (ESP) training program and demonstrates knowledge required for the use of the CHECWORKS computer program.
[35] Reference Point- The point on a piping component where the longitudinal and circumferential grid lines originate.
[36] Remaining Service Life (RSL) - The amount of time remaining based upon an established rate of wear at which the component is anticipated to thin to taccpt*
[37] Safety Factor- A Margin of Safety used to account for inaccuracies in wear rate evaluation.
[38] Sample Expansion - The addition of inspection locations based on significant or unexpected wall thinning during planned inspection(s).
IPEC00214485
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 9 OF 35 Flow Accelerated Corrosion Program 3.0 cont.
[39] Significant wall thinning - Wall thinning to a thickness which is the largest of:
(a) a thickness less than 60% of pipe nominal wall thickness (b) Wall thinning to a thickness that is half the remaining margin of the piping/
component which is above taccpt* [Y:! (0.875 tnom + taccpt)]
(c) (taccpt + 0.020) inch.
[40] Small-bore Piping - Piping that is generally 2" or less nominal diameter and that typically uses socket welded fittings.
[41] Subsequent Inspection- Inspection of components that have had a baseline inspection and/or an initial operational inspection.
[42] Susceptible Line- Piping determined to be susceptible to FAG using the EPRI susceptibility criteria in NSAC 202L, industry experience and as documented in the System Susceptible Evaluation.
[43] Susceptible Non-Modeled (SNM) Piping- A subset of the FAG susceptible lines that cannot be modeled using the EPRI CHECWORKS software.
[44] Time- Time in service shall be actual hours on line or of operation and/ or hours critical. Calendar hours may be used for conservatism.
[45] Train - Loops within subsystems that have similar geometries, flow rates and temperatures and which have similar FAG risk.
[46] UT Datasheets - Paperwork that documents the results of the ultrasonic thickness inspections.
[47] Wear (W)- The amount of material removed or lost from a components wall thickness since baseline or subsequent to being placed in service.
[48] Wear Rate (WR) - Wall loss per unit time.
IPEC00214486
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 10 OF 35 Flow Accelerated Corrosion Program 4.0 RESPONSIBILITIES 4.1 MANAGER, PROGRAMS & COMPONENTS ENGINEERING (SITE)
[1] Providing a single point of accountability and responsibility for the overall health and direction of the FAG programs.
[2] Ensuring that the FAG programs are effectively developed and implemented.
[3] Provides oversight for implementing the FAG programs.
[4] Co-ordinate ENN or ENS FAG Self-Assessments.
4.2 SUPERVISOR, CODE PROGRAMS (SITE)
[1] Designates responsible engineer/Personnel from the Code Programs Engineering Group for the implementation and maintenance of the Flow Accelerated Corrosion Program.
[2] Ensure that the Flow Accelerated Corrosion Program activities are conducted in accordance with this procedure.
[3] Shall ensure that repair procedures are in place to support any planned repairs or replacements.
[4] Ensure audits and surveillance of selected Flow Accelerated Corrosion (FAG) activities is performed to verify compliance with applicable codes, procedures and drawings.
[5] Provides personnel to perform NDE during normal plant operation and unscheduled outages.
[6] Shall provide qualified Non-Destructive Examination personnel to perform flow accelerated corrosion inspections during scheduled refueling and maintenance outages.
[7] Provides personnel to perform reviews of all final FAG UT data sheets.
[8] Provides personnel to review vendor procedures, personnel certifications and equipment certifications.
[9] Assures adequate technical personnel are available to provide required support services prior to the outage.
[1 0] Allocation of resources to execute the requirements of the program.
IPEC00214487
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 11 OF 35 Flow Accelerated Corrosion Program 4.2 cont.
[11] Provide funding and resources to address control and configuration requirements for FAG drawings.
[12] Ensures the development of bench strength and back up personnel for the FAG program.
[1] Reviews and approves FAG personnel and equipment certifications, and NDE procedures including revisions.
[2] NDE Level II or Level Ill reviews and signs all final NDE/UT data sheets to ensure appropriate NDE examinations have been completed in accordance with the FAG program. The NDE level Ill review of Risk Informed examination shall be performed in accordance with the site lSI program requirements.
[3] Resolution of anomalies found in inspection data.
[4] Identify discrepancies or deficiencies and initiates condition report in accordance with FAG program or site protocols as appropriate.
[5] Performs oversight of FAG examinations to verify vendor procedure compliance.
[6] Performs functions in accordance with applicable procedures including the Entergy Quality Assurance Program.
4.4 FLOW ACCELERATED CORROSION ENGINEER
[1] Implements and maintains an effective station FAG Program.
[2] Ensures all FAG Program work is performed in accordance with program procedural requirements.
[3] Prepares outage scope document prior to each outage using the criteria of this procedure, NSAC-202L, CHECWORKS (Pass 1 and Pass 2 output as a guide).
Along with reviewing previous outage, inspection results and industry/site specific OE. This includes replacement scopes and initiation of paperwork as appropriate in support of replacements.
[4] Shall review FAG Program basis documents (SSE and SNM).
[5] Shall provide input to Planning for publishing schedules, work scopes, resource requirements and outage progress reports IPEC00214488
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 12 OF 35 Flow Accelerated Corrosion Program 4.4 cant
[6] Review and/or perform an engineering evaluation for all Flow Accelerated Corrosion inspections where pipe wall thinning has been identified and concur on any recommended action. Calculations shall be done in accordance with applicable procedures.
[7] Evaluates examination data and performs component evaluations to determine if components can remain in service.
[8] Ensures that appropriate inspections are performed in accordance with the scope of the Flow Accelerated Corrosion Program.
[9] Shall review all inspection data and make recommendations for repair/replacement of piping materials in accordance with site protocols, if applicable.
[1 0] Identifies examination sample expansion scope when required.
[11] Shall provide NDE data for review and signature to the AN II, if requested by the ANI I.
[12] Shall provide Risk Informed Inspection data sheet (s) to the ANI I for review and signature, if applicable.
[13] Shall ensure the Flow Accelerated Corrosion inspection program incorporates industry and in-house operating experiences and identifies, tracks and trends inspection results.
[14] Maintains records of all inspection results and inspection database.
[15] Develops a FAG examination checklist/traveler that contains tnom, screening criteria, taccpt, line number, etc. for the components being inspected.
[16] Initiates request for engineering services in accordance with the Asset Suite or site specific work control process for piping replacement or engineering evaluations as required. This request should include recommended materials for replacement and configuration changes, if applicable, to reduce the effects of flow accelerated corrosion.
[17] Shall periodically review completed plant modifications to assess their effect on the scope of the flow accelerated corrosion program.
[18] Shall assist in vendor oversight as required.
IPEC00214489
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 13 OF 35 Flow Accelerated Corrosion Program 4.4 cant
[19] Maintain control of the predictive models (e.g. CHECWORKS), which includes any development, updates or revisions to the models.
[20] Developing, revising, and issuing FAG program documents.
[21] Initiating and/or responding to Condition Reports and Engineering Requests for evaluating degraded and deficient components or other discrepancies or deficiencies within the scope of the FAG program.
[22] Developing post outage inspection summary reports.
[23] Review and disposition Operating Event (OE) notices for applicability to the FAG program.
[24] Prioritizing and ranking inspection in terms of susceptibility and consequence of failure.
[25] Ensures key program elements are properly documented and program activities are controlled and performed in accordance with the applicable procedures.
[26] Maintains the System Susceptibility Evaluation and Small-Bore Non-Modeled Analysis reports.
4.5 DESIGN ENGINEERING/RESPONSIBLE ENGINEER
[1] Provide minimum acceptable wall thickness (taccpt) to the FAG Engineer.
Responsibility may be delegated to another department or qualified personnel.
[2] Perform local wall thinning evaluations for components having UT measurements that are below or are projected to go below the minimum acceptable wall thickness (taccpt) or administrative wall thickness requirement. Responsibility may be delegated to another department or qualified personnel.
[3] Prepare and issue engineering response packages for component requiring replacement. Responsibility may be delegated to another department or qualified personnel.
[4] Perform remaining service life evaluation for components in the FAG program as required. Responsibility may be delegated to another department or qualified personnel.
IPEC00214490
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 14 OF 35 Flow Accelerated Corrosion Program 4.6 MAINTENANCE SUPERVISOR/DESIGNEE
[1] The maintenance supervisor or designee will ensure that adequate craft personnel are available to support the FAG program. The supervisor shall ensure that scaffolding is erected, when needed, and insulation removal from components/piping segments scheduled for inspection and piping surface conditioning is performed prior to the scheduled inspection. Also ensures scaffolding erected in safety related areas is performed in accordance with applicable site procedures.
[2] The maintenance supervisor or designee shall notify the FAG engineer when an obstruction (i.e. support) requires removal for inspection, which may require an engineering evaluation.
[3] The maintenance supervisor must ensure that surfaces to be inspected are free from all foreign materials that would interfere with the inspections, i.e., dirt, rust, paint, etc.
If cleaning is required, this may be accomplished by power sanding (flapper wheel only), hand wire brushing, or hand sanding in accordance with site procedures/protocols.
[4] The maintenance supervisor shall ensure restoration of lines, i.e. insulation replacement and scaffold removal, upon completion of the FAG inspection.
4.7 FAC/ISI PROJECT COORDINATOR
[1] A FAC/ISI project coordinator may be chosen to implement the activities of the inspection plan. The duties, if applicable, may include but are not limited to the following activities:
(a) Performing component walk downs (b) Generating NDE inspection packages (c) Defining NDE staffing as required (d) Scheduling of inspections (e) Acquiring data as required (f) Providing field coordination to ensure timely inspections are accomplished (g) Tracking progress of the FAG inspection project (h) Transmitting inspection results to the FAG Engineer IPEC00214491
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 15 OF 35 Flow Accelerated Corrosion Program 5.0 DETAILS 5.1 PRECAUTIONS AND LIMITATIONS None.
5.2 ANALYSIS/PRE-EXAMINATION
[1] Review Data and Update Program Elements (a) Prior to selecting components for inspection, the FAG Program Engineer shall review the FAG program by the performing the following steps:
[2] Update Program Basis Document (a) Review applicable information and ensure that the scope of the FAG Program as reflected in the Basis Document System Susceptibility Evaluation (SSE) is correct AND updated in accordance with Section 5.15 [5]. The review shall include items that could affect the FAG Program from the following sources, if applicable:
(1) Design Change Packages (2) Maintenance Work Request History (3) Station Chemistry Reports (4) Station Thermography Report (5) Station Corrective Action Database (6) Maintenance Rule Classifications of FAG Systems (7) Plant Personnel (e.g. Operations, System Engineers, Chemistry, Mechanical/Structural Engineering, Air Operated Valves (AOV), Motor Operated Valves (MOV) and Check Valve Groups)
[3] Review CHECWORKS Model (a) IF any changes in plant operation, configuration, OR other factors that affect FAG that have occurred since the CHECWORKS model was last updated, THEN the model should be revised to reflect that change. As a minimum, the FAG Program Engineer should review the following items:
(1) Plant power levels (2) Operating practices. IF the plant has operated in any off-normal condition (e.g. alternate system lineups), THEN update the model accordingly.
IPEC00214492
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 16 OF 35 Flow Accelerated Corrosion Program 5.2[3](a) cant (3) Plant chemistry. Ensure that the current conditions are represented in the model.
(4) Ensure that a Pass 2 analysis has been completed in accordance with the requirements provided in this document.
[4] Update Susceptible Non-Modeled (SNM) Program Document (a) Based on the information identified in 5.2.2 AND any inspections of SNM components since the last revision, update of the Susceptible Non-Modeled Program shall be performed in accordance with Section 5.15 [5].
[5] Document Review (a) The determination of updates, IF any, AND documenting reviews along with a peer review performed by a qualified FAG Engineer shall be captured in the FAG database, Outage Report AND the Program Notebook. IF a permanent change in the susceptibility status of a line is identified, THEN the Basis Document shall be revised to reflect that change.
[6] The criteria contained in NSAC-202L, latest revision, shall be used to perform the System Susceptibility Evaluation (SSE).
[7] The System Susceptibility Evaluation report shall be developed AND peer checked in accordance with Nuclear Maintenance Manual (NMM) procedures.
[8] Non-typical operation of systems should be taken into consideration AND IF necessary factored into the FAG program.
[9] The susceptible small-bore piping inspection priority ranking should consider personnel safety, consequence of failure AND plant unavailability.
[1 0] Industry AND plant experiences relating to FAG will be factored into the program.
[11] The CHECWORKS model should be used for guidance in determining inspection priority based on relative ranking for specific locations to be examined for FAG damage.
5.3 PREPARATION OF OUTAGE INSPECTION PLAN
[1] The FAG Program Engineer shall prepare an Outage Inspection Plan prior to the outage to meet site milestones.
IPEC00214493
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 17 OF 35 Flow Accelerated Corrosion Program 5.3 cant
[2] The Outage Inspection Plan should consider the cost of repair/replacement versus inspection.
[3] The Outage Inspection Plan should consider inspection priority based on relative ranking for specific locations to be examined for FAG damage.
[4] Each identified location shall be documented in the inspection plan, along with the component number AND reason for selection AND basis for selection for inspection.
[5] The inspection plan shall be reviewed by qualified FAG personnel.
[6] Component Selection (a) The FAG engineer shall prepare a FAG Outage Inspection scope as directed by plant milestones OR as directed by Station management.
(b) Inspection selections shall be made in accordance with the requirements of this procedure AND shall be identified based on CHECWORKS results, industry/station/utility experience, required re-inspections, the non- modeled program piping AND engineering judgment.
(c) IF a selected inspection location is determined to be excessively difficult, impractical OR costly to examine due to inaccessibility, temperature, ALARA concerns, scaffolding requirements, OR other factors, THEN an equivalent alternate inspection location may be selected.
(d) Components selected shall be formally documented.
(e) The criteria for component selection should consider the following:
(1) Components selected from measured OR apparent wear found in previous inspection results.
(2) Components ranked high for susceptibility from current CHECWORKS evaluation.
(3) Components identified by industry events/experience via the Nuclear Network OR through the EPRI CHUG.
(4) Components selected to calibrate the CHECWORKS models.
(5) Components subjected to off normal flow conditions. Primarily isolated lines to the condenser in which leakage is indicated from the turbine performance monitoring system.
IPEC00214494
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 18 OF 35 Flow Accelerated Corrosion Program 5.3[6](e) cant (6) Engineering judgment I Other (7) Piping identified from Work Orders (malfunctioning equipment, downstream of leaking valves, etc.).
(8) Susceptible piping locations (groups of components) contained in the Small Bore Piping database, which have NOT received an initial inspection.
(9) Piping identified from Condition Reports/ Corrective action, Work Orders (malfunctioning equip, downstream of leaking valves, etc.).
(1 0) Vessel Shells- Feed-water heaters, moisture separator re-heaters, drain tanks etc.
[7] Inspection schedule (a) Inspection sequence AND schedule should be developed based on priority established by the FAG engineer considering repair/scope expansion potential. Consideration will also be incorporated based on other outage work priorities, job conflict AND system window duration.
(b) The FAG outage schedule should contain sufficient time for analysis AND evaluations of the components being inspected.
[8] Drawing Preparation (a) For each component scheduled for inspection, an isometric OR other acceptable location drawing should be prepared prior to the outage that identifies the component to be examined. WHEN applicable ensure the component number is shown on the drawing.
[9] Obtain Minimum Acceptable Wall Thickness (taccpt)
(a) Obtain taccpt values for each component to be inspected.
(b) The minimum acceptable wall thickness, taccpt, values should be obtained from EN-CS-S-008-MULTI as applicable OR from an approved site method (e.g. FAG Manager).
(c) Values for taccpt should be obtained from design engineering OR it may be delegated to another department OR qualified personnel. These values may be ascertained prior to OR during an outage.
IPEC00214495
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 19 OF 35 Flow Accelerated Corrosion Program 5.3 cont.
[1 0] Component Identification (a) Inspected components should have a unique identifier to allow for the tracking of inspection data.
(b) Component identifiers may allow for the identification of the Unit, system, sub-system, line number AND corresponding location of that component within a sub-system.
(c) Components in the CHECWORKS non-modeled piping may be identified by using line numbers.
[11] Pre-inspection Activities (a) Review inspection schedule, inspection requirements AND sequence with appropriate plant personnel to ensure requirements for the completion of the FAG inspection are understood.
(b) The FAG engineer should participate in the preparation of FAG inspection work packages as required.
5.4 GRIDDING
[1] Gridding of components shall be performed in accordance with recommendation of NSAC 202L, ENN-EP-S-005 (for ENN plants only), AND applicable site approved procedures OR as specified by the FAG engineer.
[2] Gridding information shall be documented on the appropriate NDE UT data sheet either by a sketch OR digital photo.
5.5 NDE TEST METHODS AND DOCUMENTATION
[1] Components can be inspected for FAG wear using ultrasonic testing (UT),
radiography testing (RT), visual observation OR other approved methods. The inspection technique used shall be at the discretion of the FAG engineer.
[2] UT thickness measurement is the primary method of determining pipe wall thickness.
(a) Inspections will be performed by using one of the following techniques:
(1) Grid Point Reading (2) Grid Scan (3) Quadrant Scan IPEC00214496
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 20 OF 35 Flow Accelerated Corrosion Program 5.5[2](a) cont.
(4) Line Scan (5) Full Scan (b) Ultrasonic Thickness measurement shall be performed in accordance with approved NDE, site OR vendor procedures.
(c) A data sheet for components inspected shall be prepared. The information included in the sheet should contain but is NOT limited to the following:
( 1) Plant's name/unit (2) Components name (3) Component sketch (4) NDE technician signature/ date (5) Grid size (6) Axial AND radial grid boundaries (7) Calibration information (8) Level II OR Level Ill signature/date (9) Work order information (1 0) Nominal & Measured thickness (11) 87.5% nominal thickness screening criteria (12) Scanning method (13) taccpt or administrative limits
[3] Radiograph Testing (a) RT (digital OR conventional) is the preferred method for inspecting socket welded fittings. The method used is at the discretion of the FAG engineer.
(b) RT can be performed during plant operations without removing insulation
[4] Visual Observation (a) Visual observation/techniques may be used for examination of large components such as tanks, cross-around piping, cross-under piping, pump casings, shell walls, valves etc. (visual techniques is only applicable to two phase flow).
(b) Follow-up UT examinations, at the discretion of the FAG engineer, may be required of areas where significant damage is observed OR suspected.
IPEC00214497
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 21 OF 35 Flow Accelerated Corrosion Program 5.6 EVALUATION OF UT INSPECTION DATA NOTE Historically, typical manufacturing practice has been to supply fittings (especially tees, elbows AND reducers) with wall thickness significantly larger than the piping nominal thickness.
NOTE Evaluation of UT inspection data described in Steps [1] through [11] shall be performed by qualified FAG personnel or designated personnel qualified in accordance with EN-DC-126.
[1] The data review should consider screening for further evaluation. Factors that should be considered WHEN reviewing the inspection data include unknown initial thickness (especially fittings), counter-bore, obstructions, AND manufacturing wall thickness variations.
[2] For each component that is examined AND is below the screening criteria of 87.5%
of nominal wall, the wear, wear rate, remaining service life shall be calculated prior to placing the component back in-service. Systems/Components with margins that exceed the 87.5% screening criteria or where site specific procedures impose more stringent requirements are excluded from these criteria.
[3] The FAG Program Engineer OR designee shall review the UT data to ensure that the data is complete AND corresponds to the requirements specified on the inspection data sheet (i.e., grid size, spacing, flow direction, starting AND ending locations, obstructions, missing data, suspect readings AND orientation).
[4] IF low readings are encountered from repeat inspections that are due to counter-bore, THEN those areas shall be noted AND additional inspections are NOT required.
[5] Grid Refinement (a) A grid reduction I refinement may be used IF the minimum measured thickness is less than the minimum required wall thickness, severe wall thinning is detected, engineering judgment, OR the projected thickness is less than the minimum required wall thickness OR as directed by the FAG engineer.
(b) The results of the grid refinement OR scan shall be documented on an inspection data sheet.
IPEC00214498
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 22 OF 35 Flow Accelerated Corrosion Program 5.6 cont.
[6] Grid Extension (a) IF measurement indicates wall loss at any edge of the grid, THEN the grid should be extended until the entire wear pattern is mapped.
[7] Determination of Initial Wall Thickness (a) Initial Thickness (tinit): The thickness determined by ultrasonic examination prior to the component being placed into service (baseline) OR the first ultrasonic examination during its service life. IF an examination has NOT previously been performed on the component, the initial thickness shall be determined by reviewing the initial ultrasonic data for that component. The area of maximum wall thickness within the same region as the worn area (based on the method selected for evaluating wear) shall be identified AND compared to tnom* IF the thickness is greater than tnom, the maximum wall thickness within that region shall be used as tinit* IF that thickness is less than tnom, tnom shall be used as tinit*
[8] Determination of Wear (a) Wear of piping components may be evaluated using the band, area, AND blanket OR point-to-point method as defined in NSAC-202 L, latest revision OR any other approved method.
(b) Evaluation of inspection data that is determined to require wear evaluation shall be documented AND reviewed.
[9] Wear rate Determination (a) Wear rate is determined by wear/ unit time (Units to be consistent with thickness evaluation).
(b) A reasonable safety factor should be applied to the wear rates to account for inaccuracies in the FAG wear rate calculations.
(c) Wear rate evaluation should be evaluated on a component evaluation sheet.
[1 0] Predicted Thickness (tp , tpred)
(a) The projected OR predicted thickness to the next schedule refueling outage.
tpred = tmeas- Safety factor x Wear Rate x Time A safety factor of 1.1 should be applied to all Entergy nuclear plants. IF a value less than 1.1 is used the reason shall be documented.
IPEC00214499
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 23 OF 35 Flow Accelerated Corrosion Program 5.6 cont.
[11] Determination of Remaining Service Life (RSL)
(a) Remaining service life (RSL) shall be evaluated as follows, units to be consistent with thickness evaluation:
RSL = (tmeas- taccpt) I (Safety Factor x Wear Rate) 5.7 EVALUATION OF RT INSPECTION DATA
[1] Qualified NDE personnel shall interpret the film AND report the examination result to the FAG engineer.
[2] Appropriate conservatism should be used to determine IF a component requires replacement OR re-inspection as a consequence of qualitative nature of RT.
[3] RT inspection shall be recorded on a data sheet.
5.8 EVALUATION OF VISUAL INSPECTION DATA
[1] Where accessible, visual inspections may be performed on two-phase flow lines.
[2] Follow-up UT inspection is required for locations where significant damage is observed OR suspected.
[3] Due to the qualitative nature of visual inspections, appropriate conservatism should be used WHEN determining whether a component is acceptable to return to service AND WHEN establishing a re-inspection frequency.
5.9 DISPOSITION OF INSPECTION RESULTS
[1] The following are used to disposition component inspection results. Reference attachment 9.3 for logic diagram NOTE Certain components may have very little margin remaining as a consequence of high stresses in the line even though tpred ;::: 0.875 tnom AND therefore may require evaluation, for example Feedwater, Condensate, RHR, etc.
[2] IF tpred is ;::: 0.875 tnom, the component is acceptable as is AND may be returned to service.
[3] IF tpred is < 0.875 tnom, evaluate for sample expansion (Reference section 5.12).
IPEC00214500
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 24 OF 35 Flow Accelerated Corrosion Program 5.9 cont.
[4] IF tpred is :5 0.3 tnom, for lSI Class 1 piping repair OR replacement is required in accordance with the requirements of ASME Section XI Repair and Replacement Program.
[5] IF tpred is :5 0.2 tnom, for lSI Class 2, Class 3 AND non-safety related, repair, replace OR evaluate as warranted in accordance with applicable site programs OR as directed by the FAC engineer.
[6] IF tpred is ;::: taccpt, the component is acceptable for continued operations, however monitoring is required in accordance with program requirements.
[7] IF tpred is < taccpt, a structural evaluation is required in accordance with site approved procedures OR engineering standards. Also a sample expansion evaluation is required. Repair or replacement in accordance with the requirements of ASME Section XI Repair and Replacement Program OR other site approved process may also be required.
[8] IF tmeas is < taccpt, generate a condition report. A structural evaluation is also required in accordance with applicable site procedures OR engineering standards.
5.10 RE-INSPECTION REQUIREMENT
[1] IF the remaining service life (RSL) of a component is greater than OR equal to the number of hours in the next operating cycle, THEN the component may be returned to service.
[2] IF the component's remaining service life (RSL) is greater than the number of hours in the next operating cycle but is less than the number of hours in the next two operating cycles, THEN the component should be considered for re-inspection, repair or replacement during the next scheduled outage.
[3] IF the component is acceptable for continued service, THEN it shall be re-examined before OR during the outage immediately prior to the cycle during which it is projected to wear to the minimum allowable wall thickness.
5.11 COMPONENTS FAILING TO MEET INITIAL SCREENING CRITERIA
[1] IF the results of the remaining life evaluation are shorter than the amount of time until the next scheduled inspection, there are several options for disposition of the component, as follows:
(a) Shorten the inspection interval (for components that can be inspected online)
IPEC00214501
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 25 OF 35 Flow Accelerated Corrosion Program 5.11[1] cont.
(b) Refine the taccpt value through a detailed stress analysis, which should be provided by Design Engineering OR designee.
(c) Repair or replace the component (d) lSI Class1 components that are less than OR equal to 0.3 tnom must be repaired OR replaced unless further structural evaluation permits continued service.
[2] Wall thinning resulting in less than taccpt shall be reported immediately to the FAG engineer by verbal OR written communications.
[3] A condition report shall be generated WHEN significant wall thinning OR unexpected wear is detected in a system OR component.
[4] A condition report shall be generated for wall thinning below taccpt OR other site established limit AND a subsequent structural evaluation performed to disposition the line for continued service.
[5] IF a previous condition report was generated for a component with wall thinning THEN no new condition report is required provided that the associated structural evaluation is current AND applicable.
5.12 SAMPLE EXPANSION
[1] IF a component is discovered that has a current OR projected wall thickness less than the minimum acceptable wall thickness (taccpt), THEN additional inspections of identical OR similar piping components in a parallel OR alternate train shall be performed to bound the extent of thinning except as provided below. Reference section 5.12[2].
[2] WHEN inspections of components detects significant wall thinning AND it is determined that sample expansion is required, the sample size for that line should be increased to include the following:
(a) Components within two diameters downstream of the component displaying significant wear OR within two diameters upstream IF the component is an expander OR expanding elbow.
(b) A minimum of the next two most susceptible components from the relative wear ranking in the same train as the piping component displaying significant wall thinning.
IPEC00214502
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 26 OF 35 Flow Accelerated Corrosion Program
- 5. 12[2] cont.
(c) Corresponding components in each other train of a multi-train line with a configuration similar to that of the piping component displaying significant wall thinning.
[3] IF the expanded inspection scope detects additional degradation, the sample expansion should continue until no additional components with significant wear are detected.
[4] Sample expansion is NOT required IF the thinning was expected OR IF the thinning is unique to that component (e.g., degradation downstream of a leaking valve).
[5] Inspections of components from the current OR past outages may satisfy the sample expansion criteria, therefore, some of the sample expansion requirements can be met without performing additional inspections.
[6] Sample expansion is NOT required for components that are being re-inspected IF normal OR expected wear is detected OR wear unique to that component. All other wear patterns encountered shall be evaluated by the FAG Engineer to determine IF sample expansion is required.
5.13 REPAIR I REPLACEMENT OF DEGRADED COMPONENTS
[NRC Generic Letter 90-05]
[1] The FAG engineer shall generate applicable documents to facilitate repair or replacement of degraded OR deficient components.
[2] Components experiencing severe OR unacceptable wear should be replaced with corrosion resistant material. However like in kind replacement may be appropriate IF procurement of a resistant material would delay plant restart.
[3] Replacing components OR fitting-by-fitting that have experienced significant wear is a satisfactory approach to reducing wear IF the wear is very localized (i.e., wear is concentrated downstream of a flow control valve OR orifice).
[4] Repairs and replacements to piping AND components within the scope of Class 1, 2, 3 shall be performed in accordance with the requirements of ASME Section XI Repair and Replacement Program.
[5] All temporary non-code repairs to lSI Class 1, 2, 3 shall comply with NRC Generic Letter 90-05.
IPEC00214503
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 27 OF 35 Flow Accelerated Corrosion Program 5.14 COMPONENT EVALUATION PACKAGES
[1] The FAG Engineer OR designee shall assemble a component evaluation package for each examined component which may contain some of, but is NOT limited to the following:
(a) UT DATA Sheet (b) Isometric drawing(s), sketches, flow diagram AND digital photo.
(c) Reference to Structural /Minimum wall evaluation (d) Component evaluation data sheet.
5.15 POST-INSPECTION ACTIVITIES
[1] The FAG Program Engineer shall prepare an Outage Summary report to document the outage FAG activities AND submit to Records for retention in accordance with applicable procedures.
[2] Update CHECWORKS models with inspection data.
[3] Update small bore susceptible report as applicable
[4] Update all applicable FAG reports.
[5] Update FAG System Susceptible (SSE) Report and Susceptible Non-Modeled Program every two cycles.
5.16 LONG TERM STRATEGY
[1] Entergy's fleet long-term strategy shall focus on reducing the plant's FAG susceptibility. Optimization of the inspection planning process is an important factor.
However, the reduction of FAG wear rates is necessary IF both the number of inspections AND the probability of failure are to be reduced. Subsequently the fleet's long term strategy will include the following elements:
(a) The use of improved materials for replaced components OR proactive replacement of piping with corrosion resistant material.
(b) Utilization of improved water chemistry (c) Incorporation of local design changes.
(d) Optimization of the inspection planning process, (e) Industry participation in meetings for technology and information transfer (e.g.
EPRI CHUG).
IPEC00214504
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 28 OF 35 Flow Accelerated Corrosion Program 5.16[1] cont.
(f) Maintaining up-to-date predictive software AND incorporating the latest inspection data in the models.
5.17 METHODS OF DETERMINING PLANT PERFORMANCE
[1] Program performance indicators, self- assessments AND bench marking are utilized as methods for monitoring program AND plant performance.
6.0 INTERFACES
[1] EN-CS-S-008-MUL Tl, "Pipe Wall Thinning Structural Evaluation".
[2] ENN-EP-S-005, "Flow Accelerated Corrosion Component Scanning and Gridding Standard".
[3] EN-DC-202, "NEI 03-08 Materials Initiative".
[4] EN-LI-102, "Corrective Action Process."
[5] CEP-NDE-0505,"Uitrasonic Thickness Examination"
[6] EN-DC-126, "Calculations".
[7] EN-DC-115, Engineering Change Development"
[8] Site ASME XI Repair I Replacement Program as applicable.
[9] NSAC 202L, latest revision, EPRI Document, "Recommendations for an Effective Flow Accelerated Corrosion Program" 7.0 RECORDS
[1] Record retention shall be in accordance with site procedures.
IPEC00214505
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 29 OF 35 Flow Accelerated Corrosion Program 8.0 SITE SPECIFIC COMMITMENTS Step Site Document Commitment Number or Reference
[1] JAF Response to NRC IE JAFP 87-0737 Bulletin 87-01
[2] JAF Response to NRC Generic JPN-89-051 Letter 89-08
[3] IPEC Unit 3 Response to NRC IE IP3-87 -055Z Bulletin 87-01
[4] IPEC Unit 3 Response to NRC Generic IPN-89-044 Letter 89-08
[5] IPEC Unit 2 Response to NRC IE Mr. Murray Selman (Con Edison) to Mr.
Bulletin 87-01 William Russell (NRC), Letter dated September 11, 1987.
[6] Pilgrim Response to NRC Generic BECo 89-107 Letter 89-08
[7] VY Response to NRC Generic Vermont Yankee letter to USNRC, FVY-Letter 89-08 89-66
[8] VY Response to NRC IE Vermont Yankee letter to USNRC, FVY-Bulletin 87-01 87-94
[9] VY Supplemental Response Vermont Yankee letter to USNRC, FVY-to NRC IE Bulletin 87-01 87-121
[1 0] ANO OCAN108914 P-1079
[11] GGNS GGNS Appendix K, Power P-35269 Uprate
[12] GGNS Response to NRC Generic P-24444 Letter 89-08
[13] RBS Response to NRC IE P-15802 Bulletin 93-02
[14] RBS Response to NRC IE P-15803 Bulletin 93-02, Supp. 1
[15] WF3 Response to INPO SOER P-16557 87-03
[16] WF3 Response to lEN 89-001 P-20303
[17] WF3 Response to lEN 93-021 P-22888
[18] PLP FAG Acceptance Criterion RCL 01038934-01
[19] PLP Response to Generic CMT891015777 Letter 89-08 Erosion/Corrosion Induced Pipe Wall Thinning IPEC00214506
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 30 OF 35 Flow Accelerated Corrosion Program 9.0 ATTACHMENTS 9.1 Guidance on Parameters affecting FAG.
9.2 Flow Accelerated Corrosion Program Attributes.
9.3 Wall Thinning Evaluation Process Map.
IPEC00214507
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 31 OF 35 Flow Accelerated Corrosion Program ATTACHMENT 9.1 GUIDANCE ON PARAMETERS AFFECTING FAC Sheet 1 of 3 GUIDANCE ON PARAMETERS AFFECTING FAC Listed below are factors to be considered when reviewing work requests, component replacements and modification packages for possible impact on the content of the FAC Program governed by EN-DC-315.
All Design Change Packages (DCP's) are required to be evaluated for impact to the FAC Program.
This list is not intended to be all-inclusive or to limit the number of items an individual would consider when performing this impact assessment. It is intended as a reasonable list of items to consider for potential program content updates.
- 1. Water Chemistry. Many water chemistry parameters have been shown to contribute to FAC.
However, the amine used to control pH also plays an important role. Amines such as ammonia tend to separate more into the steam phase in two-phase flow conditions, and therefore provide less protection in the drains. Amines such as morpholine and especially ethanolamine have better partitioning characteristics for FAC.
- b. In a BWR, pH has much less of a role since the pH is stable and there are no amine's added to control the pH. FAC rates decrease as pH level increases. FAC rates seem to drop considerably at pH values of greater than 9.3- 9.5.
- c. Oxygen Content- FAC rates decrease as oxygen concentration increases. Values that typically result in minimum FAC rates are approximately 15 to 20 ppb.
- d. Hydrogen Water Chemistrv- BWR Plants that do not have hydrogen addition normally have a main steam oxygen content near 18 ppm. Plants with hydrogen water chemistry typically have an oxygen content from 3 to 12 ppm. This has a potential to impact the corrosion rates in the LP steam systems; mainly the first and second stage reheater drains based on industry experience.
- e. Hydrazine Injection - Hydrazine is added to the feed train of PWRs as an oxygen scavenger and to maintain a reducing environment in the steam generators. From zero to approximately 150 ppb,an increase in hydrazine concentrations seems to increase rates of FAC. Higher concentrations seem to result in no further increase in FAC rates. EPRI recommends the use of high levels of hydrazine (>1 00 ppb) to protect steam generator tubes; however, this can result in accelerated rates of FAC in the feed train. Although CHECWORKS does not currently model high hydrazine conditions, any model updates performed after the release of version 1.0F should carefully consider hydrazine concentrations.
- f. Zinc Injection - Industry experience has shown that zinc injection decreases corrosion and FAC wear rates due to the concentration of zinc at the oxide surface. The amount of reduction depends on the amount of zinc at the surface.
IPEC00214508
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 32 OF 35 Flow Accelerated Corrosion Program ATTACHMENT 9.1 GUIDANCE ON PARAMETERS AFFECTING FAC Sheet 2 of 3
- 2. Piping Geometry- Piping geometry is one of the most important factors in FAC. Generally, geometries that produce the greatest turbulence also produce the highest FAC rates. Listed below are examples of obvious items that should be considered in any assessment:
- a. Addition or replacement of fittings, bends and branch connections.
- b. Like for like replacement of any fitting in a system that is susceptible to FAC damage or is part of system that is already part of the FAC Program.
- c. Alterations or repairs encountered in the nozzles or walls of FW heaters, MSR, Drain Tanks, FW Pumps, HD Pumps or CD/CB Pumps.
- d. Throttled Valves.
- 3. Piping Material Composition -Alloying elements improve the resistance of piping systems to FAC. In ascending order of resistance, the following table presents the degree of improvement over carbon steel:
Rate (carbon steel) I Material Nominal Composition Rate (alloy)
P11 1.25% Cr, 0.50% Mo 34 P22 2.25% Cr, 1.00% Mo 65 304 18% Cr >250
- 4. In-Line Components -Addition or replacement of such components as thermowells, flow elements and pressure-reducing orifices should be evaluated. The local effects caused by these components can generate FAC damage in areas where overall conditions don't indicate the need for inspections.
- 5. Component Supports- Additions or deletions of components supports which could result in the need for a review of the existing code minimum wall value or a new code minimum wall calculation.
- 6. Operational Changes - System operational changes such as the normal operation of emergency heater drains, switching of spare components, extended use of normal start-up or by-pass lines, etc.
IPEC00214509
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 33 OF 35 Flow Accelerated Corrosion Program ATTACHMENT 9.1 GUIDANCE ON PARAMETERS AFFECTING FAC Sheet 3 of 3
- 7. Component Replacements- Records should be updated for like for like replacement of fittings already in the program including new baseline data, changing next scheduled inspection due date, etc. Note and track whether the replacement components have had surface preparation and a UT grid applied for future outage planning.
- 8. External Sources- Information concerning FAC Inspection results from other stations and Nuclear Plants operated by others. General information distributed by EPRI Reports, IN PO &
NRC Bulletins, etc. should also be considered.
- 9. Maintenance History- A review of the maintenance performed on valves, orifices, steam traps, etc. should be considered. Valves that have had seat leakage can cause very localized wear in systems normally exempted. Plugged traps create water pockets in steam systems that accelerate metal loss. Eroded orifices can cause increased metal loss due to decrease in back pressure and increase in flow rates.
IPEC0021451 0
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 34 OF 35 Flow Accelerated Corrosion Program ATTACHMENT 9.2 FLOW ACCELERATED CORROSION PROGRAM ATTRIBUTES Sheet 1 of 1 PROGRAM ATTRIBUTES Attributes:
Program Infrastructure (a) Program Structure: Roles & Responsibilities, Program Ownership, Organizational Interfaces, etc.
(b) Configuration management (c) Program Bases (d) Engineering Documentation (e) Flow Accelerated Corrosion System Susceptibility Evaluation, Latest Revision.
(f) CHECWORKS models (g) Change processes Program Staffing and Experience (a) Background and Expertise.
(b) Qualification and training.
(c) Bench Strength (d) Time Allotment (e) Industry Participation Program Implementation (a) Work control (b) Inspections (c) Maintenance and Repairs (d) Control of Changes and Deferrals (e) Review of INPO Operating Experience documents, CHUG operating experience, NRC notices.
Health Monitoring:
(a) System Engineering Health reports.
(b) FAG Quarterly Health Reports.
Effective Assessment:
(a) Perform FAG Self-Assessment on a periodic basis or as defined by applicable procedures.
Oversight:
(a) Effective assessment, Benchmarking or Audits.
IPEC00214511
NUCLEAR QUALITY RELATED EN-DC-315 REV. 3 MANAGEMENT MANUAL INFORMATIONAL USE PAGE 35 OF 35 Flow Accelerated Corrosion Program ATTACHMENT 9.3 WALL THINNING EVALUATION PROCESS MAP Sheet 1 of 1 Per EN-CS-S-008-M ULTl IPEC00214512