ML20247R079
| ML20247R079 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 09/20/1989 |
| From: | Creel G BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20247R084 | List: |
| References | |
| CAL-89-08, CAL-89-8, NUDOCS 8909290172 | |
| Download: ML20247R079 (2) | |
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BALTIM ORE GAS AND ELECTRI CHARLES CENTER P.O. BOX 1475 BALTIMORE, MARYLAND 21203 GEORGE C. CREEL vice PREsiotut NuC6 EAR ENERGY (30d 260-4 455 September 20, 1989 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Submittal of Basis for Determination
REFERENCE:
(a) Letter from Mr. G. C. Creel (BG&E) to Mr. W. T. Russell (NRC),
dated May 23, 1989, Restart Commitments (b) Letter from Mr. W. T. Russell (NRC) to Mr. G. C. Creel (BG&E),
dated May 25, 1989 Confirmatory Action Letter 89-08; Restart Commitments Gentlemen:
Pursuant to our letter of May 23, 1989, your Confirmatory Action Letter 89-08 (Reference b), noted your understanding that we would provide the basis for a determination that the issue of apparent material defects associated with the Unit 2 pressurizer penetrations was either not applicable to Unit I or, if applicable, that the issue has been resolved such that the Unit can be safely operated.
Attachment (1) is our Basis for Determination that Unit I can be safely operated even though the issue is applicable to Unit 1.
Attachment (1) fully describes our investigations and the resulting conclusions. We have determined the following:
o Unit 2 has axial cracks in its leaking pressurizer heater sleeves and its leaking pressurizer instrument nozzle.
No evidence of circumferential cracks exists.
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o The cracks in Unit 2 have been characterized as Primary Water Stress Corrosion Cracking initiated by high stress imposed in the material during fabrication of the pressurizer.
o An analysis to evaluate the potential for catastrophic failure of the Unit 2 penetrations concluded that the presence of potential axial cracks in the Unit 1 pressurizer heater sleeves or instrument nozzles is not a safety concern.
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8909290172 890720 PDR ADDCK 05000317
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Docurnent Control Desk September 20, 1989
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. Our. Pressurizer Pro,iect Team will discuss this Basis for Determination with your rep esentatives on September 25, 1989, at the Phillips Building, Bethesda, MD. Should you have any further questions regarding this matter, we will be pleased to discuss them with you.
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Very truly yours, 1
GCC/JMO/ dim Attachments cc:
D. A. Brune, Esquire J. E.
Silberg, Esquire W. T. Russell, NRC W. T. Wiggins, NRC L. E. Tripp, NP.C t
J. R. Strosnider, NRC H. J. Kaplan, NRC R. A.Capra,NRC S. A. McNeil, NRC (5 Copies)
V. L. Pritchett, NRC T. Magette DNR 1'
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