ML060950220

GALL AMP: X.S1, Concrete Containment Tendon Prestress (Audit Worksheet GALL Report AMP)

ML060950220
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
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References
%dam200611, TAC MC9668
Download: ML060950220 (5)

Text

X.M1 Metal Fatigue of Reactor Coolant Pressure Boundary 1

AUDIT WORKSHEET GALL REPORT AMP PLANT: ______________________________

LRA AMP: __________________________

REVIEWER: ______________________

GALL AMP: X.S1, Concrete Containment Tendon Prestress DATE: __________________________

Program Element Auditable GALL Criteria Documentation of Audit Finding Program Description A. In order to ensure the adequacy of prestressing forces in prestressed concrete containment tendons during the extended period of operation, an applicant shall develop an aging management program (AMP) under 10 CFR 54.21(c)(1)(iii).

The AMP consists of an assessment of the results of inspections performed in accordance with the requirements of Subsection IWL of the ASME Section XI Code, as supplemented by the requirements of 10 CFR 50.55a(b)(2)(ix) or (viii) in the later amendment of the regulation. The assessment related to the adequacy of the prestressing force will consist of the establishment of (1) acceptance criteria and (2) trend lines.

Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

B. The acceptance criteria will normally consist of predicted lower limit (PLL) and the minimum required prestressing force, also called minimum required value (MRV). NRC Regulatory Guide 1.35.1 provides guidance for calculating PLL and MRV.

Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

C. The trend line represents the trend of prestressing forces based on the actual measured forces. NRC Information Notice IN 99-10 provides guidance for constructing the trend line. The goal is to keep the trend line above the PLL because, as a result of any inspection performed in accordance with ASME Section XI, Subsection IWL, if the trend line crosses the PLL, the Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

X.M1 Metal Fatigue of Reactor Coolant Pressure Boundary 2

Program Element Auditable GALL Criteria Documentation of Audit Finding existing prestress in the containment tendon could go below the MRV soon after the inspection and would not meet the requirements of 10 CFR 50.55a(b)(2)(ix)(B) or 10 CFR 50.55a(b)(2)(viii)(B).

D. As evaluated below, this time limited aging analysis (TLAA) is an acceptable option to manage containment tendon prestress force, except for the program element/attribute regarding operating experience. Thus, it is recommended that the staff should further evaluate an applicant's operating experience related to the containment tendon prestress force. The AMP related to the adequacy of prestressing force for containments with grouted tendons will be reviewed on a case-by-case basis.

Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

1. Scope of Program A. The program addresses the assessment of containment tendon prestressing force when an applicant chooses to perform the containment prestress force TLAA using 10 CFR 54.21(c)(1)(iii).

Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment

2. Preventive Actions A. Maintaining the prestress above the MRV, as described under program description above, will ensure that the structural and functional adequacy of the containment are maintained.

Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

3. Parameters Monitored/

Inspected A. The parameters to be monitored are the containment tendon prestressing forces in accordance with requirements specified in Subsection IWL of Section XI of the ASME Code, as incorporated by reference in 10 CFR 50.55a.

Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

X.M1 Metal Fatigue of Reactor Coolant Pressure Boundary 3

Program Element Auditable GALL Criteria Documentation of Audit Finding

4. Detection of Aging Effects A. The loss of containment tendon prestressing forces is detected by the program.

Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

5. Monitoring and Trending A. The estimated and measured prestressing forces are plotted against time and the PLL, MRV, and trending lines developed for the period of extended operation.

Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

6. Acceptance Criteria A. The prestressing force trend lines indicate that existing prestressing forces in the containment tendon would not be below the MRVs prior to the next scheduled inspection, as required by 10 CFR 50.55a(b)(2)(ix)(B) or 10 CFR 50.55a(b)(2)(viii)(B).

Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

7. Corrective Actions A. If acceptance criteria are not met, then either systematic retensioning of tendons or a reanalysis of the containment is warranted to ensure the design adequacy of the containment.

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. 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.

Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

9.

A. As discussed in the appendix to this report, the staff finds the Consistent with GALL AMP:

Yes No

X.M1 Metal Fatigue of Reactor Coolant Pressure Boundary 4

Program Element Auditable GALL Criteria Documentation of Audit Finding Administrative Controls requirements of 10 CFR Part 50, Appendix B, acceptable to address the administrative controls.

Document(s) used to confirm Criteria:

Comment:

10. Operating Experience A. The program incorporates the relevant operating experience that has occurred at the applicant's plant as well as at other plants. The applicable portions of the experience with prestressing systems described in NRC Information Notice 99-10 could be useful for the purpose. However, tendon operating experience could be different at plants with prestressed concrete containments. The difference could be due to the prestressing system design (e.g., button-headed, wedge, or swaged anchorages), environment, and type of reactor (i.e.,

PWR and BWR). Thus, the applicant's Consistent with GALL AMP:

Yes No Document(s) used to confirm Criteria:

Comment:

X.M1 Metal Fatigue of Reactor Coolant Pressure Boundary 5

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 DURING AUDIT Document Number Identifier (number)

Title Revision and/or Date

1.

2.

3.

4.

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