ML19345A508
| ML19345A508 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 07/27/1962 |
| From: | Case E US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML19345A507 | List: |
| References | |
| NUDOCS 8011240054 | |
| Download: ML19345A508 (2) | |
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DOCKET 10. 50-29 HAZARDS ANALYSIS BY THE RESEARCH AND MdER REACIOR SAFETY BRANCH DIVISION OF LICENSING AND REDULATION in the matter of YANKEE AiOMIC ELECTRIC COMPANY PROPOSED CHANGE 10. 25 Introduction Pursuant to the provisions of paragraph 3. A.of License No. DPR-3, as amended, Yankee Atomic Electric Company in Proposed Change No. 25, dated July 17, 1962, requested authorization to modify the design of
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the control rod followers used in the Yankee reactor. This modification
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would consist of providing stainless steel end adapters at the upper end of the circaloy control rod followers so that the joints between the followcrs r absorber sections involve contact between stainless steel and stainless steel rather than between stainless steel and zircaloy.
Discussion During operation with Core I, Yankee found that wear occured at the joints between the zircaloy followers and the stainless steel adapters at the bottom of the control rod absorber sections. Yankee has stated that this was apparently caused by relative motion at the joint between the two different naterials and the resultant continued destruction of the protective filn formed on the circaloy in the reactor water.
This wear would be prevented during future reactor operation by providing the stainless steel to stainless steel joint which Yankee believes will 80 112+ ooSy
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2-be essentially free from wear during the anticipated service life of
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the control rod absorber sections and the.tircaloy followers.
Conclusion E[
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Based upon our review, we have concluded that Proposed Change
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!!c. 25 should result in an increase in the reliability of the control
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rod assemblies. Accordingly, it is our opinion that it does not present significant hazards considerations not described or implicit in the license application as amended to June 23, 1961. We have mi.
further concluded that them is masonable assurance that the health
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facility as proposed.
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Original Signed by 4x; nun..
L G. Case Edson G. Case, Assistant Director Facilities Licensing Division of Licensing and Regulation
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