ML20071D977
| ML20071D977 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 03/01/1983 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20071D974 | List: |
| References | |
| NUDOCS 8303110404 | |
| Download: ML20071D977 (3) | |
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION h
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION CONCERNING THE SECONDARY WATER CHEMISTRY MONITORING AND' CONTROL ~ PROGRAM
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ARKANSAS HUCLEAR ONE, UNIT N0. 1,
ARKANSAS POWER AND LIGHT COMPANY DOCKET NO. 50-313 Introduction In response to our request dated August 31, 1982, Arkansas Power and Light Company (the licensee or AP&l.) provided, by letter dated November 9,1982, infomation concerning the secondary water chemistry monitoring and control program to minimize steam generator tube degradation for Arkansas Nuclear One, Unit No.1.
Background
In late 1975, we incorporated provisions into the Standard Technical Specifications (TSs) that required limiting conditions for operation and surveillance requirements for secondary water chemistry parameters.
The TSs for all pressurized water reactor plants that have been issued an operating license since 1972 contain either these provisions or a re'quirement to establish these provisions after, baseline chemistry conditions have been determined. The intent of the provisions was to provide adde _d assurance that the operators of licensed plants would properly monitor and control secondary water chemistry to limit corrosion of steam generator components, such as tubes and tube support plates.
In a number of instances, the TSs have significantly restricted the operational flexibility of some plaats with little or no benefit with regard to limiting degradation of steam generator tubes and the tube support plates. Based on this experience and the knowledge gained in recent years, we have concluded that TS limits are not the most effec-tive way of assuring that steam generator degradation will be minimized.
Due to the complexity of the corrosion phenomena. involved and the state-of-the-art as it exists today, we are of the opinion that, in lieu of' specifying limiting conditions in the TS, a'more effective approach would be to institute a license condition that requires the implementation of a secondary water chemistry monitoring and control program containing appropriate procedures and administrat.ive controls.
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The required program and procedures are to be developed by licensees with input from their reactor vendor or other consultants, to account for site and plant specific factors that affect water chemistry conditions in the steam generators.
In our view, plant operation following such 1
procedures would provide assurance that licensees would devote proper attention in controlling secondary water chemistry, while also providing the needed flexibility to allow them to d?al effectively with an off-nomal condition that might arise.
Consequently, by letter dated July 23, 1979, we requested that the licensee propose a secondary water chemistry program which would be referenced in a condition to the operating license and would replace any l
pmposed TS on secondary water chemistry. AP&L responded by letter dated September 20, 1979. The infomation1n this letter was insuf-ficient to allow us to complete our evaluation of the secondary water.
chemistry program. We therefore requested the licensee to supply additional information. This information was submitted by letter dated November 9,1982, and is being evaluated in this report.
Discussion The secondary water chemistry program, outlined in the information sub-mitted by letter date'd November 9,1982, addresses the six program criteria of our staff position as discussed below.
It is based on the steam generator water chemistry program recommended by the NSSS vendor (Babcock & Wilcox).
The program monitors the critical parameters to inhibit steam generator corrosion and tube degradation. The limits and sampling schedules for these parameters have been established for (a) steam generator samples under cold shutdown / wet layup mode, (b) feedwater and steam generator blowdown samples under startup/ hot standby / steaming at <l5% full power modes, and (c) feedwater and condensate pump discharge samples under power operation mode. Sampling frequencies, control points for the critical parameters, and process sampling points have been identified.
The analytical techniques used for measuring the values of the critical parameters have been similarly identified and confom to the recommenda-tions of the NSSS vendor. The Chemis.try and Environmental Supervisor and/or the Shift Supervisor are charged with the responsibility for inter pretation of secondary-side water chemistry data and implementation of specific corrective actions.
Evaluation We find that the licensee's secondary side chemistry monitoring and control program:
(a) is capable of reducing the probability of abnomal leakage i' the l
reactor coolant pressure boundary by inhibiting steam generator l
corrosion and tube degradation and thus meets the requirements of General Design Criterion 14; 0
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AND-1 (b) adequately addresses all of the program criteria delineated in the NRC staff position on control and monitoring of secondary water; (c) is based on the NSSS vendor's recommended steam generator water chemistry program; (d) monitors the secondary coolant purity in accordance with Branch Technical Position MTEB 5-3, Revision 2, and thus neets Acceptance Criterion 3 of Standard Review Plan Section 5.4.2.1,
" Steam Generator Materials", Revision 1; (e) monitors the water quality of the secondary side water in the steam generators to detect potential condenser cooling water in-leakage to the condensate, and thus meets Position II. 3.f.(1) of Branch Technical Position MTEB 5-3, Revision 2; (f) describes the methods for control of secondary side water chemistry data and record of management procedures and corrective actions for off-control point chemistry and thus meets Positions II.
3.f.(2)-(6) of Branch Technical Position METB 5-3, Revision 2.
Conclusion On the basis of our evaluation, we conclude that the secondary water chemistry monitoring and control program for ANO-1 meets (1) the requirements of General Design Criterion 14 insofar as secondary water chemistry control assures primary boundary material integrity, (2)
Acceptance Criterion 3 of Standard Review Plan Section 5.4.2.1, Revision 1, (3) Position II.3 of Branch Technical Position MTEB 5-3,
' Revision 2, and (4) the program criteria in the staff's position and, therefore, is acceptable.
Dated: NAR 011983 The following NRC personnel have contributed to this Safety Evaluation:
Guy S. Vissing and Brookhaven National Laboratory.
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