ML060950540

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 NRC/NRR/ADRO/DLR/RLRC
To:	Office of Nuclear Reactor Regulation
morgan M 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

AUDIT WORKSHEET GALL REPORT AMP PLANT: ______________________________

LRA AMP: __________________________ REVIEWER: ______________________

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

Program Auditable GALL Criteria Documentation of Audit Finding Element Program A. The program relies on recommendations for a comprehensive Consistent with GALL AMP: Yes No Description bolting integrity program, as delineated in NUREG-1339, and Document(s) used to confirm Criteria:

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 Comment:

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.

1. Scope of A. This program covers bolting within the scope of license Consistent with GALL AMP: Yes No Program renewal, including: 1) safety-related bolting, 2) bolting for nuclear Document(s) used to confirm Criteria:

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 Comment closure studs is addressed by XI.M3, and is not included in this XI.M18 Bolting Integrity 1

Program Auditable GALL Criteria Documentation of Audit Finding Element program.

B. The staffs recommendations and guidelines for Consistent with GALL AMP: Yes No comprehensive bolting integrity programs that encompass all Document(s) used to confirm Criteria:

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 industrys technical basis for the program for safety-related bolting and Comment:

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.

2. Preventive A. Selection of bolting material and the use of lubricants and Consistent with GALL AMP: Yes No Actions sealants is in accordance with the guidelines of EPRI NP-5769, Document(s) used to confirm Criteria:

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 Comment:

with regard to them.

B. Bolting replacement activities include proper torquing of the Consistent with GALL AMP: Yes No bolts and checking for uniformity of the gasket compression after Document(s) used to confirm Criteria:

assembly. Maintenance practices require the application of an appropriate preload, based on EPRI documents.

Comment:

3. Parameters A. This program monitors the effects of aging on the intended Consistent with GALL AMP: Yes No Monitored/ function of bolting. Specifically, bolting for safety-related Document(s) used to confirm Criteria:

Inspected 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. Comment:

B. High strength bolts (actual yield strength 150 ksi) used in Consistent with GALL AMP: Yes No NSSS component supports are monitored for cracking. Document(s) used to confirm Criteria:

XI.M18 Bolting Integrity 2

Program Auditable GALL Criteria Documentation of Audit Finding Element 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 A. Inspection requirements are in accordance with the ASME Consistent with GALL AMP: Yes No of Aging Section XI, Tables IWB 2500-1, IWC 2500-1 and IWD 2500-1 Document(s) used to confirm Criteria:

Effects 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 Comment:

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.

B. For other pressure retaining bolting, periodic system Consistent with GALL AMP: Yes No walkdowns assure detection of leakage before the leakage Document(s) used to confirm Criteria:

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 Comment:

XI.M18 Bolting Integrity 3

Program Auditable GALL Criteria Documentation of Audit Finding Element 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 A. The inspection schedules of ASME Section XI are effective Consistent with GALL AMP: Yes No and Trending and ensure timely detection of applicable aging effects. If bolting Document(s) used to confirm Criteria:

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. Comment:

6. A. Any indications of aging effects in ASME pressure retaining Consistent with GALL AMP: Yes No Acceptance bolting are evaluated in accordance with Section XI of the ASME Document(s) used to confirm Criteria:

Criteria Code.

Comment:

B. For other pressure retaining bolting, NSSS component Consistent with GALL AMP: Yes No support bolting and structural bolting, indications of aging should Document(s) used to confirm Criteria:

be dispositioned in accordance with the corrective action process.

Comment:

XI.M18 Bolting Integrity 4

Program Auditable GALL Criteria Documentation of Audit Finding Element

7. Corrective A. Replacement of ASME pressure retaining bolting is performed Consistent with GALL AMP: Yes No Actions in accordance with appropriate requirements of Section XI of the Document(s) used to confirm Criteria:

ASME Code, as subject to the additional guidelines and recommendations of EPRI NP-5769.

Comment:

B. Replacement of other pressure retaining bolting (i.e., non- Consistent with GALL AMP: Yes No Class 1 bolting) and disposition of degraded structural bolting is Document(s) used to confirm Criteria:

performed in accordance with the guidelines and recommendations of EPRI TR-104213.

Comment:

C. Replacement of NSSS component support bolting is Consistent with GALL AMP: Yes No performed in accordance with EPRI NP-5769. As discussed in Document(s) used to confirm Criteria:

the appendix to this report, the staff finds the requirements of 10 CFR Part 50, Appendix B, acceptable to address the corrective actions.

Comment:

8. A. Site quality assurance (QA) procedures, review and approval Consistent with GALL AMP: Yes No Confirmation processes, and administrative controls are implemented in Document(s) used to confirm Criteria:

Process 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. Comment:

9. A. See item 8, above. Consistent with GALL AMP: Yes No Administrative Document(s) used to confirm Criteria:

Controls Comment:

10. Operating A. Degradation of threaded bolting and fasteners in closures for Consistent with GALL AMP: Yes No Experience the reactor coolant pressure boundary has occurred from boric Document(s) used to confirm Criteria:

acid corrosion, SCC, and fatigue loading (NRC IE Bulletin 82-02, NRC Generic Letter 91-17). SCC has occurred in high strength XI.M18 Bolting Integrity 5

Program Auditable GALL Criteria Documentation of Audit Finding Element bolts used for NSSS component supports (EPRI NP-5769). The bolting integrity program developed and implemented in Comment:

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.

XI.M18 Bolting Integrity 6

EXCEPTIONS Item Program Elements LRA Exception Description Basis for Accepting Exception Documents Reviewed Number (Identifier, Para.# and/or Page #)

1.

2.

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

1.

2.

DOCUMENT REVIEWED DURING AUDIT Document Number Identifier (number) Title Revision and/or Date 1.

2.

3.

4.

XI.M18 Bolting Integrity 7