ML19260C491
| ML19260C491 | |
| Person / Time | |
|---|---|
| Issue date: | 10/30/1979 |
| From: | Almeter F, Strosnider J Office of Nuclear Reactor Regulation |
| To: | Hanauer S Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-03, REF-GTECI-A-04, REF-GTECI-A-05, REF-GTECI-SG, TASK-A-03, TASK-A-04, TASK-A-05, TASK-A-3, TASK-A-4, TASK-A-5, TASK-OR NUDOCS 8001030727 | |
| Download: ML19260C491 (3) | |
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OCT 3 01979 MEMORANDUM FOR:
S. H. Hanauer, Director Unresolved Safety Issues FROM:
J. R. Strosnider, A-3 and A-5 Task Manager Engineering Branch, D0R F. M. Almeter, A-4 Task Manager Engineering Branch, D0R
SUBJECT:
MAIN STEAM CONDENSER INTEGRITY
Reference:
Memorandum from S. S. Pawlicki to J. Strosnider and F. Almeter, dated October 3,1979, subject: Main Steam Condenser Integrity As a result of a recent memo from S. S. Pawlicki, Chief, Materials Engineering Branch, to J. Strosnider and F. Almeter, A-3, A-4, and A-5 Task Managers (reference 1) the question of rain steam condenser integrity and its relation to TAPS A-3, A-4, and A-5 has oeen raised.
You requested that we provide you with a discussion of this subject.
With reference to the technical issue, it has been shown and is generally acknowledged that materials used in secondary system components and integrity of these components is directly related to steam generator tube degradation phenomena.
Problems which are related to the secondary system are not limited to main condenser integrity but also include items that can potentially allow for contaminant ingress from demineralizer systems and the potential for metal ion transfer from feedwater heaters and other secondary side equipment. All of these possibilities can accelerate corrosion and adversely affect steam generator tube integrity.
With respect to the TAPS, main condenser integrity has always been included in their scope.
Revision 1 of TAPS A-3 and A-4 specifically included the subject of main con-denser integrity in Sections 2E and 4D.
Section 4E of the draft Revision 2 of the TAPS, which defines the Mechanical and Materials Engineering Branches areas of responsibility, states:
8001 0 1700 109
OCT 1 c '979 S. H. Hanauer.
E.
Mechanical Engineering and Materials Engineering Branches, Division of Systems Safety have responsibility for the review of mechanical and material tube integrity and lead responsibility for the review of new design, material, and operating methods.
The activities involved will include the review and evaluation of applicant's and vendors proposed improvements on the design and/or operation of the steam generators for items such as secondary coolant chemistry, design modifications to avoid tube corrosion and denting, condenser design to avoid inleakage, ISI requirements, recommendation for revision of Reg-ulatory Guides and Sections 10.3.6 and 10.3.7 of the Standard Review Plan.
Manpower Estimates Mechanical Engineering Branch Materials Engineering Branch
.10 Manyear FY 1979
.10 Manyear FY 1979
.25 Manyear FY 1980
.25 Manyear FY 1980 Condenser design to avoid inleakage is specifically identified as an area for review and evaluation.
Furthermore, with his input, a scope of work was de-fined for B. Turovlin of the fiaterials Engineering Branch when the Unresolved Safety Issues Group was established. One task included in that scopo was the following:
Suggest secondary water chemistry guidelinesincluding:
1.
parameters to be controlled, 2.
appropriate limits 3.
reliability of main condensers 4.
potential for containment ingress from demineralizers, and 5.
potential for metal ion transfer from the main condenser and other secondary side equipment.
We concur with the Materials Engineering Branch in the significance of main condenser integrity and further emphasize the significance of overall secondary system materials selection and mechanical design.
In response to the Materials Engineering Branch's comments, we intend to further: emphasize this subject in Revision 2 of the steam generator TAPS; however, we want to emphasize that this subject has always been included in the scope af the TAPS.
The establishment of strict secondary water chemistry specificatiors has been a subject of great attention and some controversy. A joint position establish-ed by D0R and DSS is that simply setting technical specification limits will not serve the intended purpose.
Continued plant operation is necessary to flush out impurities that are transported to the steam generators when conden-ser tubes leak, and technical specificatinns requiring plant shutdown when water 1700 110
---... tuu OCT 3 01979 S. H. Hanauer chemistry specifications are violated would be counter productive or de-trimental.
It is therefore more effective to control the problem at its source by maintaining condenser tube integrity and by using more euttable materials for the condenser and feedwater systems. This position has raised sorce informal debate about including secondary system material and co::1ponent-designs under NRC regulations.
It is intended tisat the final NUREG report for TAPS A-3. A-4, and A-5 will explain the already established position for secondary water chemistry technical specifications and will make recommendations reg.trding inclusion of secondary systems material and conponent designs under NRC regulations.
Let us know if you have any questions or feel that further discussion of the above subjects are required.
Original signed by:
i Jack R. Strosnider I
A-3 and A-5 Task Manager Engineering Branch, D0R 1
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-.: rignes b Frank M. Alme[e:r A-4 Task Manager Engineering Branch. 00R cc:
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W. Hazelton H. Conrad R. Gamble B. Turovlin J. Rajan jrf n j j j u
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