ML060950567

GALL AMP: XI.M21, Closed-Cycle Cooling Water System (Audit Worksheet GALL Report AMP)

ML060950567
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: ML060950567 (6)

Text

AUDIT WORKSHEET GALL REPORT AMP PLANT: ______________________________

LRA AMP: __________________________ REVIEWER: ______________________

GALL AMP: XI.M21, Closed-Cycle Cooling Water System DATE: __________________________

Program Auditable GALL Criteria Documentation of Audit Finding Element Program A. The program includes (a) preventive measures to minimize Consistent with GALL AMP: Yes No Description corrosion and stress corrosion cracking (SCC) and (b) testing Document(s) used to confirm Criteria:

and inspection to monitor the effects of corrosion and SCC on the intended function of the component. The program relies on maintenance of system corrosion inhibitor concentrations within the specified limits of Electric Power Research Institute (EPRI) Comment:

TR-107396 to minimize corrosion and SCC. Non-chemistry monitoring techniques such as testing and inspection in accordance with guidance in EPRI TR-107396 for closed-cycle cooling water (CCCW) systems provide one acceptable method to evaluate system and component performance. These measures will ensure that the intended functions of the CCCW system and components serviced by the CCCW system are not compromised by aging.

1. Scope of A. A CCCW system is defined as part of the service water Consistent with GALL AMP: Yes No Program system that is not subject to significant sources of Document(s) used to confirm Criteria:

contamination, in which water chemistry is controlled and in which heat is not directly rejected to a heat sink. The program described in this section applies only to such a system. If one or more of these conditions are not satisfied, the system is to be Comment:

considered an open-cycle cooling water system. The staff notes that if the adequacy of cooling water chemistry control cannot be confirmed, the system is treated as an open-cycle system as indicated in Action III of Generic Letter (GL) 89-13.

XI.M21 Closed-Cycle Cooling Water System 1

Program Auditable GALL Criteria Documentation of Audit Finding Element

2. Preventive A. The program relies on the use of appropriate materials, Consistent with GALL AMP: Yes No Actions lining, or coating to protect the underlying metal surfaces and Document(s) used to confirm Criteria:

maintain system corrosion inhibitor concentrations within the specified limits of EPRI TR-107396 to minimize corrosion and SCC. The program includes monitoring and control of cooling water chemistry to minimize exposure to aggressive Comment:

environments and application of corrosion inhibitor in the CCCW system to mitigate general, crevice, and pitting corrosion as well as SCC.

3. Parameters A. The aging management program monitors the effects of Consistent with GALL AMP: Yes No Monitored/ corrosion and SCC by testing and inspection in accordance with Document(s) used to confirm Criteria:

Inspected guidance in EPRI TR-107396 to evaluate system and component condition. For pumps, the parameters monitored include flow, discharge pressures, and suction pressures.

Comment:

B. For heat exchangers, the parameters monitored include flow, Consistent with GALL AMP: Yes No inlet and outlet temperatures, and differential pressure. Document(s) used to confirm Criteria:

Comment:

4. Detection of A. Control of water chemistry does not preclude corrosion or Consistent with GALL AMP: Yes No Aging Effects SCC at locations of stagnant flow conditions or crevices. Document(s) used to confirm Criteria:

Degradation of a component due to corrosion or SCC would result in degradation of system or component performance. The extent and schedule of inspections and testing should assure detection of corrosion or SCC before the loss of the intended Comment:

function of the component. Performance and functional testing ensures acceptable functioning of the CCCW system or components serviced by the CCCW system. For systems and components in continuous operation, performance adequacy should be verified by monitoring component performance through data trends for evaluation of heat transfer capability, system branch flow changes and chemistry data trends.

XI.M21 Closed-Cycle Cooling Water System 2

Program Auditable GALL Criteria Documentation of Audit Finding Element Components not normally in operation are periodically tested to ensure operability.

5. Monitoring A. The frequency of sampling water chemistry varies and can Consistent with GALL AMP: Yes No and Trending occur on a continuous, daily, weekly, or as needed basis, as Document(s) used to confirm Criteria:

indicated by plant operating conditions and the type of chemical treatment. In accordance with EPRI TR-107396, internal visual inspections and performance/functional tests are to be performed periodically to demonstrate system operability and Comment:

confirm the effectiveness of the program.

B. Tests to evaluate heat removal capability of the system and Consistent with GALL AMP: Yes No degradation of system components may also be used. The Document(s) used to confirm Criteria:

testing intervals should be established based on plant-specific considerations such as system conditions, trending, and past operating experience, and may be adjusted based on the results of a reliability analysis, type of service, frequency of operation, Comment:

or age of components and systems.

6. Acceptance A. Corrosion inhibitor concentrations are maintained within the Consistent with GALL AMP: Yes No Criteria limits specified in the EPRI water chemistry guidelines for Document(s) used to confirm Criteria:

CCCW. System and component performance test results are evaluated in accordance with system and component design basis requirements. Acceptance criteria and tolerances are to be based on system design parameters and functions. Comment:

7. Corrective A. Corrosion inhibitor concentrations outside the allowable limits Consistent with GALL AMP: Yes No Actions are returned to the acceptable range within the time period Document(s) used to confirm Criteria:

specified in the EPRI water chemistry guidelines for CCCW. If the system or component fails to perform adequately, corrective actions are taken. As discussed in the appendix to this report, the staff finds the requirements of 10 CFR Part 50, Appendix B, Comment:

acceptable to address the corrective actions.

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 XI.M21 Closed-Cycle Cooling Water System 3

Program Auditable GALL Criteria Documentation of Audit Finding Element 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 closed-cycle cooling water systems due to Consistent with GALL AMP: Yes No Experience corrosion product buildup (NRC Licensee Event Report [LER] Document(s) used to confirm Criteria:

50-327/93-029-00) or through-wall cracks in supply lines (NRC 50-280/91-019-00) has been observed in operating plants.

Accordingly, operating experience demonstrates the need for this program. Comment:

XI.M21 Closed-Cycle Cooling Water System 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.

XI.M21 Closed-Cycle Cooling Water System 5