ML20045D207
| ML20045D207 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/17/1993 |
| From: | Miller D PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CNN-93-14092, NUDOCS 9306280091 | |
| Download: ML20045D207 (2) | |
Text
'CCNf 93-14092 e
PIIILADELPHIA ELECTRIC COMPANY PEACII BOTlDM ATOMIC POWER STATION R. D 1, Box 208 Delt2, IYnnsylvania 17314 rrxu soriou-run rows a or exctin tm.e (717) 456-7014 D. B. Miller, h.
Vice President Docket Nos. 50-277 50-278 Ucense Nos. DPR-44 DPR-56 U. S. Nuclear Regulatory Commission 3y,,
37, 1993 Document Control Desk Washington, DC 20555
Subject:
Peach Bottom Atomic Power Station Emergency Service Water (ESW) System Test Frequency Extension
Reference:
NRC Inspection Report 50-277/91-31 and 50-278/91-31 dated 2/7/92 in the cover letter of the referenced inspection report, you confirmed our commitment to continue performing monthly ESW system flow testing due to problems we were experiencing in maintaining adequate system flow rates. You also indicated that we should infonn you of our intent and justification to increase our test interval. Based on improved system operations and system trending, we are planning to increase our test interval to 6 weeks beginning July 1,1993. Our monthly testing has increased our understanding of system performance under various seasonal conditions and improved our ability to trend system performance.
The results of our trending indicate that the corrective actions implemented in 1991 (i.e. chemical treatment improvements, system realignments) to resolve flow degradation have been effective in increasing the flow margin in the system and in reducing the system's susceptibility to flow blockage and degradation. Flow trending has revealed that the ESW system is susceptible to some flow degradation primarily following chemical treatments for Asiatic clams. Because the Asiatic clam chemical treatment program requires flow testing to be performed after the treatment period is complete to identify any coolers which may have become fouled with Asiatic clams, this post-treatment test will not be impacted by this change in test frequency.
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k-The change in test frequency from a monthly to a six week interval will not result in a Ligreificant increase in the test periodicity and, therefore will not adversely affect our ability to monitor the system for degradation. This change in test frequency has been reviewed and approved by the Plant Operations Review Committee (PORC). It is our expectation to make future adjustments to the ESW test frequency based on the results of future trending. Future changes will be reviewed and' approved in a similar manner.
Additionally, this change in test frequency has been discussed with the Senior Resident Inspector.
If you have any questions, please feel free to contact us.
Sincerely, 1
i cc:
R. A.Burricelli, Public Service Electric & Gas l
W. P. Dornsife, Commonwealth of Pennsylvania B. Norris, Senior Resident inspector, US NRC l
T. T. Martin, Administrator, Region I, US NRC R. l. McLean, State of Maryland H. C. Schwemm, Atlantic Electric C. D. Schaefer, Delmarva Power j
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