ML060950220

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

ML060950220
Person / Time
Site:	Vermont Yankee
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
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References
%dam200611, TAC MC9668
Download: ML060950220 (5)

Text

AUDIT WORKSHEET GALL REPORT AMP PLANT: ______________________________

LRA AMP: __________________________ REVIEWER: ______________________

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

Program Auditable GALL Criteria Documentation of Audit Finding Element Program A. In order to ensure the adequacy of prestressing forces in Consistent with GALL AMP: Yes No Description prestressed concrete containment tendons during the extended Document(s) used to confirm Criteria:

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 Comment:

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.

B. The acceptance criteria will normally consist of predicted Consistent with GALL AMP: Yes No lower limit (PLL) and the minimum required prestressing force, Document(s) used to confirm Criteria:

also called minimum required value (MRV). NRC Regulatory Guide 1.35.1 provides guidance for calculating PLL and MRV.

Comment:

C. The trend line represents the trend of prestressing forces Consistent with GALL AMP: Yes No based on the actual measured forces. NRC Information Notice Document(s) used to confirm Criteria:

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 Comment:

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Program Auditable GALL Criteria Documentation of Audit Finding Element 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 Consistent with GALL AMP: Yes No an acceptable option to manage containment tendon prestress Document(s) used to confirm Criteria:

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 Comment:

related to the adequacy of prestressing force for containments with grouted tendons will be reviewed on a case-by-case basis.

1. Scope of A. The program addresses the assessment of containment Consistent with GALL AMP: Yes No Program tendon prestressing force when an applicant chooses to perform Document(s) used to confirm Criteria:

the containment prestress force TLAA using 10 CFR 54.21(c)(1)(iii).

Comment

2. Preventive A. Maintaining the prestress above the MRV, as described Consistent with GALL AMP: Yes No Actions under program description above, will ensure that the structural Document(s) used to confirm Criteria:

and functional adequacy of the containment are maintained.

Comment:

3. Parameters A. The parameters to be monitored are the containment tendon Consistent with GALL AMP: Yes No Monitored/ prestressing forces in accordance with requirements specified in Document(s) used to confirm Criteria:

Inspected Subsection IWL of Section XI of the ASME Code, as incorporated by reference in 10 CFR 50.55a.

Comment:

X.M1 Metal Fatigue of Reactor Coolant Pressure Boundary 2

Program Auditable GALL Criteria Documentation of Audit Finding Element

4. Detection of A. The loss of containment tendon prestressing forces is Consistent with GALL AMP: Yes No Aging Effects detected by the program. Document(s) used to confirm Criteria:

Comment:

5. Monitoring A. The estimated and measured prestressing forces are plotted Consistent with GALL AMP: Yes No and Trending against time and the PLL, MRV, and trending lines developed Document(s) used to confirm Criteria:

for the period of extended operation.

Comment:

6. Acceptance A. The prestressing force trend lines indicate that existing Consistent with GALL AMP: Yes No Criteria prestressing forces in the containment tendon would not be Document(s) used to confirm Criteria:

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).

Comment:

7. Corrective A. If acceptance criteria are not met, then either systematic Consistent with GALL AMP: Yes No Actions retensioning of tendons or a reanalysis of the containment is Document(s) used to confirm Criteria:

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. Comment:

8. A. As discussed in the appendix to this report, the staff finds the Consistent with GALL AMP: Yes No Confirmation requirements of 10 CFR Part 50, Appendix B, acceptable to Document(s) used to confirm Criteria:

Process address the confirmation process.

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 3

Program Auditable GALL Criteria Documentation of Audit Finding Element Administrative requirements of 10 CFR Part 50, Appendix B, acceptable to Document(s) used to confirm Criteria:

Controls address the administrative controls.

Comment:

10. Operating A. The program incorporates the relevant operating experience Consistent with GALL AMP: Yes No Experience that has occurred at the applicant's plant as well as at other Document(s) used to confirm Criteria:

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 Comment:

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 X.M1 Metal Fatigue of Reactor Coolant Pressure Boundary 4

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.

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