ML19347C494
| ML19347C494 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 08/21/1962 |
| From: | Case E US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML19347C493 | List: |
| References | |
| NUDOCS 8011190763 | |
| Download: ML19347C494 (2) | |
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UNITED STATES AT051IC ENERGY C0!!>!ISSION HAZARDS ANALYSIS BY THE RESEARCH AND POWER REACTOR SAFETY BRANCH DIVISION OF LICENSING AND REGULATION
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IN THE MATTER OF YANKEE ATOMIC ELECTRIC COMPANY PROPOSED CHANGE NO. 24 p===
DOCKET NO. 50-29 Introduction Pursuant to the provisions of paragraph 3.A. of License No. DPR-3 as amended, Yankee Atomic Electric Company in Proposed Change No. 24, dated June 4, 1962, n.
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..lj5 requested authorization to make certain -revisions in the Nomal Plant Operating l
Instructions and in the Plant Maintenance Instructions. These revisions would i.y.;
A be for the purpose of pemitting Yankee to perfom the cold leak tests described in Maintenance Instruction No. 506B3 on a portion of the primary system rather f9:
than on the entire system, thereby obviating the necessity of subjecting the' main coolant pumps to high pressure while the system is at ambient temperature.
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Discus _sion Yankee has report'ed that a different closure - bolt tightening schedule l'
is required for the main coolant pumps during the cold hydrostatic test than is used during nomal operation: The different schedule is necessary to prevent
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main coolant pump flange deformation during this test.
If cold leak testing.
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l of the vessel and certain other portions of the primary system with the main
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I coolant loops isolated from the vessel is authorized, the main coolant flange m
i=7 bolts would not have to be tightened for the test and then subsequently 5 ::
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backed-off prior to hot operations.
Upon review of the revisions in the Normal Plant Operating Instructions and the Plant Maintenance Instructions which have been proposed by Yankee, we
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have concluded that isolation of the main coolant loops during the cold leak
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tests would not constitute a significant change in the safety of operation of
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the facility. We believe, however, that these Instructions should specifically indicate that the proposed isolation of the reactor vessel will be conducted
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only during the cold leak test and will not be carried out at other times.
h'c also believe, of course, that following any opening of the main coolant
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system, no matter where, an appropriate pressure test should be carried out
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to insure the structural integrity and leak tightness of the affected portion j===
j of the system.
Conclusion Based on the above, we believe that Proposed Change No. 24, as modified,,-
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does not present significant hazards considerations not described or implicit in the license application, as amended to June 23, 1961. We have further concluded that there i.s reasonable assurance that the health and safety of
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the public will not be endangered by operation of the facility as proposed
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and as modified.
I U J.=k FOR THE ATOMIC ENERGY C0m!ISSION h=
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=1 Edson G. Case, Assistant Director Facilities Licensing.
Division of Licensing and Regulation
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