ML20049H352
| ML20049H352 | |
| Person / Time | |
|---|---|
| Issue date: | 02/18/2020 |
| From: | William Burton NRC/NRR/DNRL/NLRP |
| To: | |
| Burton W, NRR-DNRL 415-6332 | |
| Shared Package | |
| ML20049H344 | List: |
| References | |
| Download: ML20049H352 (2) | |
Text
SLR Document Changes: Closed Treated Water Systems Overview of purpose of change: Revise AMP XI.M21A, Closed Treated Water Systems, to include the latest revision of EPRI closed cooling water chemistry guideline.
Basis Document Input: Revise NUREG-2221 as follows.
Add a new row to Table 2-29 as follows:
XI.M21A Closed Treated Water Systems Location of Summary of Technical Bases for Changes Change Significant Changes Update industry EPRI issued 3002000590, Closed Cooling Parameters chemistry guideline to Water Chemistry Guideline, Revision 2 in Monitored later version in EPRI 2013 from the previous version (1007820).
or Inspected 3002000590, Closed According to EPRI, a committee of industry Cooling Water experts collaborated in reviewing data and References Chemistry Guideline, generating water-chemistry guidelines, which Revision 2. should be used at all nuclear plants, that has been endorsed by the utility chemistry community. Approved precedents for use of the more recent version of the above guideline are documented in the NRCs SERs for Turkey Point and Peach Bottom (ML19191A057, and ML19280D820, respectively).
Revise Section 4, References as follows:
EPRI. EPRI 10078203002000590, Closed Cooling Water Chemistry Guideline, Revision 2.
Palo Alto, California: Electric Power Research Institute. April 2004December 2013.
GALL-SLR: Revise NUREG-2191 as follows.
XI.M21A CLOSED TREATED WATER SYSTEMS
- 3. Parameters Monitored or Inspected: This program monitors water chemistry parameters (preventive monitoring) and the condition of surfaces exposed to the water (condition monitoring). Depending on the water treatment program selected for use in association with this AMP and/or plant OE, this program may also include corrosion monitoring (e.g., corrosion coupon testing) and microbiological testing.
Water chemistry parameters (such as the concentration of iron, copper, silica, oxygen, and hardness, alkalinity, specific conductivity, and pH) are monitored because maintenance of optimal water chemistry prevents loss of material and cracking due to corrosion and SCC. The specific water chemistry parameters monitored and the 1
SLR Document Changes: Closed Treated Water Systems acceptable range of values for these parameters are in accordance with the Electric Power Research Institute (EPRI) 10078203002000590, Closed Cooling Water Chemistry Guideline, which is used in its entirety for the water chemistry control or guidance.
The visual appearance of surfaces is evaluated for evidence of loss of material. The results of surface or volumetric examinations are evaluated for surface discontinuities indicative of cracking. The heat transfer capability of heat exchanger surfaces is evaluated by either visual inspections to determine surface cleanliness, or functional testing to verify that design heat removal rates are maintained.
References EPRI. EPRI 10078203002000590, Closed Cooling Water Chemistry Guideline, Revision 2.
Palo Alto, California: Electric Power Research Institute. April 2004December 2013.
Table XI-01. FSAR Supplement Summaries for GALL-SLR Report Chapter XI Aging Management Programs AMP GALL-SLR Description of Program Implementation Program Schedule XI.21A Closed This is a mitigation program that also includes Program and Treated a condition monitoring program to verify the SLR Water effectiveness of the mitigation activities. The enhancements, Systems program consists of: (a) water treatment, when including the use of corrosion inhibitors, to applicable, are modify the chemical composition of the water implemented such that the effects of corrosion are 6 months prior minimized; (b) chemical testing of the water to the so that the water treatment program maintains subsequent the water chemistry within acceptable period of guidelines; and (c) inspections to determine extended the presence or extent of degradation. The operation.
program uses as applicable, EPRI 10078203002000590, Closed Cooling Water Chemistry Guideline, and includes corrosion coupon testing and microbiological testing.
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