ML20247K072
| ML20247K072 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 07/21/1989 |
| From: | Drawbridge B YANKEE ATOMIC ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-NUREG-1344 BYR-89-119, GL-89-08, GL-89-8, IEB-87-001, IEB-87-1, NUDOCS 8907310440 | |
| Download: ML20247K072 (2) | |
Text
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YANKEEATOMICELECTRIC COMPANY
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b*(5 Y m me 580 Main Street, Bolton, Massachusetts 01740-1398 July 21,1989 BYR 89-119 United States Nuclear Regulatory Commission Document Control Desk Washington,' DC 20555
References:
(a) License No. DPR-3 (Docket No. 50-29)
(b) USNRC Letter to Yankee, dated May 2, 1989 (c) Yankee Letter to USNRC dated September 11, 1987 3
Subject:
Response to USNRC Generic Letter 89-08, " Erosion / Corrosion Induced Pipe Wall Thinning"
Dear sir:
In Reference (b), the USNRC requested Yankee to provide assurances that formalized procedures or administrative controls have been nr will be implemented to ensure continued long-term implementation of the Yankee Nuclear Power Station's (YNPS) Erosion / Corrosion Monitoring Program.
Our Erosion / Corrosion Monitoring Program has been successfully applied during the past two refueling outeges. Briefly, our program consists of a systematic evaluation of single-phase and two-phase high energy carbon steel piping systems using criteria which close13 follows the NUMARC gu Melines contained in NUREG-1344. The details of the program were submitted to you in our response to Bulletin No. 87-01, Reference (c).
In summary..our response concluded that no significant pipe wall thinning, other than that attributed to normal wear, had occurred in single-phase piping at YNPS. Yankee also committed to perform future refueling inspections of high energy piping systems (single and two-phase), to establish ret.11stic wear rates and subsequent inspection frequencies.
Since the submittal of Reference (c), Yankee has performed ultrasonic inspections during the 1988 refueling outage of base line locations established for monitoring during the 1987 refueling. The results of the 1988 inspections revealed no significant wear rate trend in single-phase piping systems within the scope of our inspection program.
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h00l 8907310440 890721 FDR ADOCK 05000029 P
e t-United States Nuclear Regulatory Commission July 21, 1989 Attention: Document Control Desk Page 2 BYR 89-119 Yankee is presently in the process of establishing administrative controls to assure the continued implementation of this program. These controls will include the following:
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An inspection schedule based upon wear rate trending of susceptible erosion / corrosion areas classified for monitoring.
o Separate procedures for safety-related piping.
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Administrative procedures which will be periodically reviewed t6 address program scope and technical criteria.
o Procedure (s) which will contain requirements for formal documentation (records) of inspection results aad repair / replacement of piping or components.
Yankee intends to complete these plant procedures before the next refueling outage, currently scheduled for June 1990.
We consider the maintenance of high energy piping to be an important issue for plant and personnel safety. The development of administrative controls and plant inspection procedures will ensure that the requirements of Generic Lutter 89-08 are. satisfied at YNPS.
We trust that you will find this submittal satisfactory; however, if you have any questions or require additional information, please contact us.
Very truly..yours, YANKEE ATO.IC ELECTRIC COMPANY
$/fb B. L. Drawbr4fgg/
Vice President and Manager of Operations BLD/la.2/0414v cc: bSNRC Region I USNRC Resident Inspector, YNPS COMMONWEALTH OF !%SSACHUSETTS)
)ss MIDDLESEX COUNTY
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Then personally appeared before me, B. L. Drawbridge, who, being duly
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. worn, did state that he is Vice President and Manager of Operations of Yankee Atomic Electric Company, that he is duly authorized to execute and file the foregc;ng document in the name and on the behalf of Yankee Atomic El:ctric Company and that the statements therein are true to the best of his knowledge and belief.
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Helen D. Sammarco Notary Public My Commission Expires November 7, !93i I
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