ML20195G530
| ML20195G530 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 06/21/1988 |
| From: | Randazza J Maine Yankee |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| GL-88-05, GL-88-5, MN-88-62, NUDOCS 8806280032 | |
| Download: ML20195G530 (2) | |
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4 MaineYankee
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REllABLE ELECTRICITY FOR MAINE SINCE 1972 EDISON DRIVE. AUGUSTA. MAINE 04J30. (207) 6224868 June 21, 1988 MN-88-62 9'
UNITED STATES NUCLEAR REGULATORY COMMISSION Attention: Document Control Desk Hashington, D. C.
20555
References:
(a)
License No. OPR-36 (Docket No. 50-309)
(b) NRC Generic Letter 88-05, Boric Acid Corrosion of Carbon Steel Reactor Pressure Boundary Components in PHR Plants dated March 17, 1988.
Gentlemen:
Subject:
Response to Generic Letter 88-05 This is in response to your letter, Reference (b), regarding programs to address the corrosive effects of boric acid from reactor coolant system (RCS) leakage on the integrity of the RCS pressure boundary.
Reference (b) identifies four attributes of an adequate program to address boric acid corrosion, namely:
l Determine the principal locations where boric acid leakage at less than technical specification limits could'cause degradation of the pressure boundary.
L Procedures for locating small RCS leaks.
Methods for examination and engineering evaluations of leakage.
l Corrective actions to prevent recurrences e.g., design modifications, i
protective coatings, etc.
Maine Yankee has taken steps to address some of these items.
For example, the principal locations where we pay close attention to small boric acid l
1eakage include the following:
l Reactor head and flange areas (including bolting).
Lower Reactor Vessel near incore instrument penetrations.
Reactor coolant loop piping.
Primary manwayr on the steam generators and pressurizer (including bolting).
Pressurizer Shell Packing gland bolting on all Safety Class 1 valves.
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1 MaineYankee United States Nuclear Regulatory Commission Page Two Attention: Document Control Desk HN-88-62 Maine Yankee judiciously attempts to detect and promptly correct any RCS leakage thereby mitigating the effects of boric acid corrosion.
During normal operation and brief shutdowns the operations department performs routine containment-inspections to detect conditions that may adversely affect nuclear safety.
They also perform daily reactor coolant leakage evaluations when the
-RCS is above 500*F.
Plant Engineering conducts a detailed inspection of the reactor coolant system after extended shutdowns.
If leakage (other than normal controlled leakage) is detected during the performance of the RCS leak test procedure, it is corrected before the plant goes on line.
The procedure also addresses boric acid deposits, corrosion of ferritic steels, and insulation removal to allow visual examination of wetted surfaces.
RCS leakage is reported and repaired in accordance with a Discrepancy Reporting (DR) procedure.
This procedure provides guidance for identifying, prioritizing and tracking repairs that are required for systems, components, and equipment.
Maine Yankee's existing procedures form the foundation of a program to address the concerns expressed in Generic letter 88-05; however, in order to fully address these concerns, programmatic and procedural enhancements are necessary.
A program description documenting our systematic approach to ensuring that the RCS pressure boundary is not degraded due to boric acid corrosion will be developed. He expect to have a program description and the associated procedure revisions fully implemented by December 31, 1989.
This should assure that the issues raised in G.L. 88-05 are adequately addressed.
Very truly yours, HAINE YANKEE l
CG" J. B. Randazza President SDE/bjp l
l c: Mr. Richard H. Hessman l
Mr. Hilliam T. Russell L
Hr. Patrick H.
Sears l
Mr. Cornelius F. Holden STATE OF HAINE Then personally appeared before me, John B. Randazza, who being duly sworn l
did state that he is President of Haine Yankee Atomic Power Company, that he is duly authorized to execute and file the foregoing response in the name and l
on behalf of Maine Yankea Atomic Power Company, and that the statements therein are true to the best of his knowledge and belief.
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Ndkary Public 0073L-SDE av ccmst:N EXNf 3 APR 21,1994