ML060950540

2006/03/22-GALL AMP: XI.M18, Bolting Integrity (Audit Worksheet GALL Report AMP)

ML060950540
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	03/22/2006
From:	Morgan M J NRC/NRR/ADRO/DLR/RLRC
To:	Office of Nuclear Reactor Regulation
morgan M J NRR/NRC/DLR/RLRC, 415-2232
Shared Package
ML060950189	List: ML060950195 ML060950215 ML060950218 ML060950220 ML060950224 ML060950235 ML060950250 ML060950258 ML060950262 ML060950269 ML060950271 ML060950277 ML060950279 ML060950284 ML060950290 ML060950301 ML060950311 ML060950323 ML060950328 ML060950331 ML060950347 ML060950351 ML060950356 ML060950364 ML060950370 ML060950372 ML060950375 ML060950540 ML060950549 ML060950559 ML060950567 ML060950570 ML060950573 ML060950579 ML060950582 ML060950587 ML060950596 ML060950606 ML060950610 ML060950620 ML060950624 ML060950629 ML060950632 ML060950634 ML060950637 ML060950645 ML061000078 ML061000090 ML061000096 ML061000101 ... further results
References
%dam200611, TAC MC9668
Download: ML060950540 (6)

Text

XI.M18 Bolting Integrity 1 AUDIT W ORKSHEET GALL R EPORT AMP PLANT: ______________________________

LRA AMP: __________________________

R EVIEWER: ______________________

GALL AMP: XI.M18, Bolting Integrity DATE: __________________________

Program Element Auditable GALL Criteria Documentation of Audit Finding Program Description A. The program relies on recommendations for a comprehensive bolting integrity program, as delineated in NUREG-1339, and industry recommendations, as delineated in the Electric Power Research Institute (EPRI) NP-5769, with the exceptions noted in NUREG-1339 for safety-related bolting. The program relies on industry recommendations for comprehensive bolting maintenance, as delineated in EPRI TR-104213 for pressure retaining bolting and structural bolting. The program generally includes periodic inspection of closure bolting for indication of loss of preload, cracking, and loss of material due to corrosion, rust, etc. The program also includes preventive measures to preclude or minimize loss of preload and cracking. Other aging management programs, such as XI.M1, "ASME Section XI Inservice Inspection (ISI) Subsections IWB, IWC, and IWD" and XI.S3, "ASME Section XI Subsection IWF" also manage inspection of safety-related bolting and supplement this bolting integrity program. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: 1. Scope of Program A. This program covers bolting within the scope of license renewal, including: 1) safety-related bolting, 2) bolting for nuclear steam supply system (NSSS) component supports, 3) bolting for other pressure retaining components, including non-safety-related bolting, and 4) structural bolting (actual measured yield strength 150 ksi). The aging management of reactor head closure studs is addressed by XI.M3, and is not included in this Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment XI.M18 Bolting Integrity 2 Program Element Auditable GALL Criteria Documentation of Audit Finding program. " B. The staff's recommendations and guidelines for comprehensive bolting integrity programs that encompass all safety-related bolting are delineated in NUREG-1339, which include the criteria established in the 1995 edition through the 1996 addenda of ASME Code Section XI. The industry's technical basis for the program for safety-related bolting and guidelines for material selection and testing, bolting preload control, ISI, plant operation, and maintenance, and evaluation of the structural integrity of bolted joints, are outlined in EPRI NP-5769, with the exceptions noted in NUREG-1339. For other bolting, this information is set forth in EPRI TR-104213. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: 2. Preventive Actions A. Selection of bolting material and the use of lubricants and sealants is in accordance with the guidelines of EPRI NP-5769, and the additional recommendations of NUREG-1339, to prevent or mitigate degradation and failure of safety-related bolting (see element 10, below). NUREG-1339 takes exception to certain items in EPRI NP-5769, and recommends additional measures with regard to them. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: " B. Bolting replacement activities include proper torquing of the bolts and checking for uniformity of the gasket compression after assembly. Maintenance practices require the application of an appropriate preload, based on EPRI documents. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: 3. Parameters Monitored/ Inspected A. This program monitors the effects of aging on the intended function of bolting. Specifically, bolting for safety-related pressure retaining components is inspected for leakage, loss of material, cracking, and loss of preload/loss of prestress. Bolting for other pressure retaining components is inspected for signs of leakage. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: " B. High strength bolts (actual yield strength ~150 ksi) used in NSSS component supports are monitored for cracking. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

XI.M18 Bolting Integrity 3 Program Element Auditable GALL Criteria Documentation of Audit Finding Structural bolts and fasteners are inspected for indication of potential problems including loss of material, cracking, loss of coating integrity, and obvious signs of corrosion, rust, etc.

Comment: 4. Detection of Aging Effects A. Inspection requirements are in accordance with the ASME Section XI, Tables IWB 2500-1, IWC 2500-1 and IWD 2500-1 editions endorsed in 10 CFR 50.55a(b)(2) and the recommendations of EPRI NP-5769. For Class 1 components, Table IWB 2500-1, Examination Category B-G-1, for bolts greater than 2-inches in diameter, specifies volumetric examination of studs and bolts and visual VT-1 examination of surfaces of nuts, washers, bushings, and flanges. Examination Category B-G-2, for bolts 2-inches or smaller, requires only visual VT-1 examination of surfaces of bolts, studs, and nuts. For Class 2 components, Table IWC 2500-1, Examination Category C-D, for bolts greater than 2-inches in diameter, requires volumetric examination of studs and bolts. Examination Categories B-P, C-H, and D-B require visual examination (IWA-5240) during system leakage testing of all pressure-retaining Class 1, 2 and 3 components, according to Tables IWB 2500-1, IWC 2500-1, and IWD 2500-1, respectively. In addition, degradation of the closure bolting due to crack initiation, loss of prestress, or loss of material due to corrosion of the closure bolting would result in leakage. The extent and schedule of inspections, in accordance with Tables IWB 2500-1, IWC 2500-1, and IWD 2500-1, combined with periodic system walkdowns, assure detection of leakage before the leakage becomes excessive. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: " B. For other pressure retaining bolting, periodic system walkdowns assure detection of leakage before the leakage becomes excessive. High strength structural bolts and fasteners (actual yield strength 150 ksi) for NSSS component supports, may be subject to stress corrosion cracking (SCC). For this type of high strength structural Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

XI.M18 Bolting Integrity 4 Program Element Auditable GALL Criteria Documentation of Audit Finding bolts that are potentially subjected to SCC, in sizes greater than 1-inch nominal diameter, volumetric examination comparable to that of Examination Category B-G-1 is required in addition to visual examination. This requirement may be waived with adequate plant-specific justification. Structural bolts and fasteners (actual yield strength < 150 ksi) both inside and outside containment are inspected by visual inspection (e.g., Structures Monitoring Program or equivalent). In addition to visual and volumetric examination, degradation of these bolts and fasteners may be detected and measured by removing the bolt/fastener, a proof test by tension or torquing, in situ ultrasonic tests, or a hammer test. If these bolts and fasteners are found cracked and/or corroded, a closer inspection is performed to assess extent of corrosion. An appropriate technique is selected on the basis of the bolting application and the applicable code. 5. Monitoring and Trending A. The inspection schedules of ASME Section XI are effective and ensure timely detection of applicable aging effects. If bolting connections for pressure retaining components (not covered by ASME Section XI) is reported to be leaking, then it may be inspected daily. If the leak rate does not increase, the inspection frequency may be decreased to biweekly or weekly. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: 6.

Acceptance Criteria A. Any indications of aging effects in ASME pressure retaining bolting are evaluated in accordance with Section XI of the ASME Code. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: " B. For other pressure retaining bolting, NSSS component support bolting and structural bolting, indications of aging should be dispositioned in accordance with the corrective action process. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

XI.M18 Bolting Integrity 5 Program Element Auditable GALL Criteria Documentation of Audit Finding 7. Corrective Actions A. Replacement of ASME pressure retaining bolting is performed in accordance with appropriate requirements of Section XI of the ASME Code, as subject to the additional guidelines and recommendations of EPRI NP-5769. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: " B. Replacement of other pressure retaining bolting (i.e., non-Class 1 bolting) and disposition of degraded structural bolting is performed in accordance with the guidelines and recommendations of EPRI TR-104213. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: " C. Replacement of NSSS component support bolting is performed in accordance with EPRI NP-5769. As discussed in the appendix to this report, the staff finds the requirements of 10 CFR Part 50, Appendix B, acceptable to address the corrective actions. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: 8.

Confirmation Process A. Site quality assurance (QA) procedures, review and approval processes, and administrative controls are implemented in accordance with the requirements of 10 CFR Part 50, Appendix B. As discussed in the appendix to this report, the staff finds the requirements of 10 CFR Part 50, Appendix B, acceptable to address the confirmation process and administrative controls. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: 9.

Administrative Controls A. See item 8, above. Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment: 10. Operating Experience A. Degradation of threaded bolting and fasteners in closures for the reactor coolant pressure boundary has occurred from boric acid corrosion, SCC, and fatigue loading (NRC IE Bulletin 82-02, NRC Generic Letter 91-17). SCC has occurred in high strength Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

XI.M18 Bolting Integrity 6 Program Element Auditable GALL Criteria Documentation of Audit Finding bolts used for NSSS component supports (EPRI NP-5769). The bolting integrity program developed and implemented in accordance with commitments made in response to NRC communications on bolting events have provided an effective means of ensuring bolting reliability. These programs are documented in EPRI NP-5769 and TR-104213 and represent industry consensus. Degradation related failures have occurred in downcomer Tee-quencher bolting in BWRs designed with drywells (ADAMS Accession Number ML050730347). Leakage from bolted connections has been observed in reactor building closed cooling systems of BWRs. (LER 50-341/2005-001). The applicant is to evaluate applicable operating experience to support the conclusion that the effects of aging are adequately managed. Comment:

XI.M18 Bolting Integrity 7 EXCEPTIONS Item Number Program Elements LRA Exception Description Basis for Accepting Exception Documents Reviewed (Identifier, Para.# and/or Page #) 1. 2. -

ENHANCEMENTS Item Number Program Elements LRA Enhancement Description Basis for Accepting Enhancement Documents Reviewed (Identifier, Para.# and/or Page #) 1. 2. -

DOCUMENT REVIEWED D URING A UDIT Document Number Identifier (number) Title Revision and/or Date 1. 2. 3. 4. -.