ML20247P561

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Confirms Implementation of long-term Monitoring Program, Assuring That Procedures or Administrative Controls in Place to Guard Against erosion/corrosion-induced Pipe Wall Thinning in high-energy Carbon Steel Sys
ML20247P561
Person / Time
Site: Maine Yankee
Issue date: 07/27/1989
From: Garrity J
Maine Yankee
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-89-08, GL-89-8, JHG-89-21, MN-89-98, NUDOCS 8908040219
Download: ML20247P561 (2)


Text

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J v5 IMaineYankee-REUABLE ELECTRICITY FOR MMNE SINCE 1972

> Ro. box 408 WISCASSET, MAINE 04578 . (207) 882 6321 L

g e

July 27, 1989

MN-89 -JHG-89-21:

l UNITED STATES NUCLEAR REGULATORY COMMISSION' Attention: Document Control Desk Washington, D. C. -20555 e

F Referencet: (a) License No. OPR-36 (Docket No. 50-309)

L (b) USNRC Letter to MYAPC0 dated July 9, 1987-IE Bulletin 87-01 (c) MYAPC0 Letter to USNRC dated September 11, 1987 (MN-87-100)

(d) USNRC Letter to MYAPCO dated May 21, 1989 -

Generic Letter 89-08 Erosion / Corrosion-Induced r Pipe Wall Thinning (e)' 'NUREG-1344; Erosion / Corrosion-Induced Pipe Wall Thinning In U.S. Nuclear Power Plants, April 1989 b R

Subject:

Erosion / Corrosion-Induced Pipe Wall Thinning I

-Gentlemen:

This letter is in response to USNRC Generic Letter 89-08 which requested each licensee to confirm that a long term erosion / corrosion monitoring program has been implemented to assure that procedures or administrative controls are in place to guard against erosion / corrosion-inauced pipe wall thinning in high-energy carbon steel systems. NRC IE Bulletin 87-01 also discussed this topic.

Maine Yankee has conducted erosion / corrosion monitoring for two phase systems since the early 1980s, and single phase systems since 1987. Since 1985 this process has been governed by procedures. Maine Yankee upgraded our monitoring program to include the NUMARC Technical Subcommitt.se Working Group guidelines on'this topic following their release. Also, Maine Yankee was one of the. ten pilot plants selected by NRC for audit. The staff visited Maine Yankee in August of 1988 and the results of the staff's audit are described in NUREG-1344, Reference (e). In that NUREG, the staff indicsted that ..."the licensee *s current program meets the intent of NUMARC guidelin'es for

. erosion / corrosion-monitoring in single phase lines," however, they further I stated "a more formalized program with appropriate procedures would tend to l firm up and fill out an otherwise good program." Following the hRC visit we issued the Maine Yankee Erosion /Ct>rrosion Monitoring Program which is a subprogram of our. Supplemental Equipment Reliability Program (SERP). This (

program specifies the selection criteria, frequency and method of examination,  !

acceptance criteria, implementation and record keeping requirements for erosion / corrosion monitoring. He believe this program and existing procedures adequately ensure continued long term erosion / corrosion monitoring at Maine phoy

' Yankee;

,, 1)I 03981-JHG 8908040219 890727 PDR ADOCK 05000309

! P PDC -

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h 9 , iJJHG-89-21 July 27, 1989 Page 2 of 2 We trust this information is satisfactory. Please contact us should you haveany questions regarding this matter.

Very truly yours, MAINE YANKEE J. H. Garrity, Vice President Engineering and Licensing JHG:WSD Enclosure c: Mr. Richard H. Wessman Mr. William T. Russell Mr. Patrick M. Sears Mr. Eric J. Leeds Mr. Cornelius F. Holden STATE OF MAINE Then personally appeared before me, John H. Garrity, who being duly sworn did state that he is Vice President of Maine Yankee Atomic Power Company, that he is duly authorized to execute and file the foregoing response in the name and on behalf of Maine Yankee Atomic Power Company, and that the statements therein are true to the best of his knowledge and belief.

QtnW 0-Notary'Public

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03981-JH3

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