ML20154K184
| ML20154K184 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 09/16/1988 |
| From: | Hairston W ALABAMA POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.D.1, TASK-TM NUDOCS 8809230240 | |
| Download: ML20154K184 (2) | |
Text
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e Nabama Pcwor Comp:.ny 600 North 18th Street Post Office Box 2641 B.rmingham. Nabama 35291-0400 Telephone 205 2501837 W. G. Heirston. Ill l
Sen of V6ce Prosident I
Nucient Operatens t*e southem t%ctrc system September 16, 1988
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Docket Nos. 50-348 50-364 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Vashington, D.C.
20555 Gentlement Joseph M. Farley Nuclear Plant - Units 1 and 2 NUREG-0737, Item II.D.1, Reviev Completion Schedule Update By letter dated February 5, 1987, Alabama Power Company committed to advise the NRC of the results of valkdovns of the safety valve discharge piping for each unit and to provide a schedule for resolution of NRC concerns on this issue. These NRC concerns involve a postu kted over-stress condition of the safety valve discharge piping duung certain plant transients.
In addition, the issue of inspection and maintenance of the safety valves is to be addressed.
Alabama Pover Company has completed valkdowns of each unit and has determined that raising the temperature of the vater in the loop neal piping between the pressurizer and the safety valves is the preferred alternative for lowering the postulated stresses in the discharge piping.
Due to the temperatures that must be achieved and congested area la which the modific.ation aust be made, two refueling outages (RO) vill be required.
During the initial refueling outere (Unit 2 6th R0, Unit 19th RO),
modifications vill be maPa to alle.v installation of reflective insulation to the loop seal piping at the subsequent outage. These modifications have been determined necessary by c.nginearing analysis to ensure sufficient heat is conducted to the loop seal vater.
Upon completion of these modifications, as-built drawings vill be made of the region, insulation design finalized, and a final insulation design verification valkdovn vill be performed. Fabrication of the custom insulation may then connence vith insulation of the loop neal region to be accotaplished during the subsequent outages (Unit 2 7th RO, Unit 1 10th RO).
At the conclusion of these outages, at-power temperature m asurements of the loop seal piping vill be made to determine if enhancements to the insulation design a e necessary.
These enhancements, if required, will be made during subsequent outages of sufficient duration.
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U. S. Nuclear Regulatory Commission September 16, 1988 Page 2 Vith regard to inspection and maintenance of the safety valves, Alabama Power Company's current inspection, testing and maintenance procedures are considered sufficient to ensure the operability of the safety valves. However, procedures vil), be revised to ensure that, in the event a safety valve lifts due to an operational transient, an evaluation vill be performed to determine the operability of the safety valve.
If determined necessary by the evaluation, the appropriate inspection and maintenance activities vill be performed.
In conclusion, modifications vill be made during future refueling outages to raise the temperature of the loop seal vater to allow sufficient flashing of the vater to steam. This flashing to steam vill reduce postulated loadings on the downstream piping below code allovable values. These modifications, in conjunction with the inspection, test and maintenance procedures discussed above, are considered by Alabara Power Company to resolve all remaining issues associated with-NUREG-0737, Item II.D.1.
If you have any goestions, please advise.
Respectfully submitted, A1.ALU(A POVER COMPANY Y.,b. kt wW V. G. Hairston, III VCR,III/J ARidst 5/8.5 cci Mr. L. B. Long Dr. J. N. Grace Mr. E. A. Reeves Mr. G. F. Maxsell 7.:
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