ML20039A557
| ML20039A557 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry, Oconee  |
| Issue date: | 11/19/1981 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Parris H TENNESSEE VALLEY AUTHORITY |
| References | |
| REF-GTECI-A-10, REF-GTECI-RV, TASK-A-10, TASK-OR NUDOCS 8112180206 | |
| Download: ML20039A557 (3) | |
Text
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Docket Nos. 50-259 50-260 NOV 19 19g3 50 296
~
e Mr. Hugh G. Parris i
Manager of Power y
-l Tennessee Valley Authority gV8 019A R C "ddLu% @,** j 500 A Chestnut Street, Tower II h%
Chattanooga, Tennessee 37401 4
//
Dear Mr. Parris:
RE:
IMPLEMENTATION OF UNRESOLVED SAFETY ISSUE A-10, BWR N0ZZLE CRACKING - BROWNS FERRY NUCLEAR PLANT UNITS 1, 2 AND 3 By letter dated October 13, 1981 you provided the information requested in our letter dated July 22, 1981 regarding the above subject. Specifically, you discussed: (1) a fracture mechanics analysis to be performed to determine whether a feedwater system low-flow controller need be installed and whether reactor water cleanup (RWCU) should be rerouted, and (2) revised commitments for control rod drive (CRD) hydraulic system modifications.
With regard to the fracture mechanics analysis, the position stated in Generic Letter 81-11 did not specifically include deletion of the RWCU rerouting as an option based upon completion of the ' analysis. However, it is our understanding that the rerouting of the RWCU (with the resultant increase in heat supplied to the feedwater system) and the modification of the low flow controller (to provide a constant feedwater flow even at low power levels) should be complementary, rather than independent, solutions.
We also understand that plant-specific differences in startup and turbine-wamup procedures may result in the need for large amounts of feedwater flow or substantial RWCU discharge during the early stages of startup.
Either of these requirements may obviate the benefits of RWCU rerouting.
We request that, should you determine from your evaluation that the beneficial aspects of RWCU rerouting are obviated, the detailed bases of your evaluation and conclusion, with regard to both RWCU and low-flow controller, be included in the post-modification reports requested by NUREG-0619.
With regard to the modifications of the CRD hydraulic system, we cannot accept your not installing the equalizing valves called for in Section 8.1 (4)(a ) of NUREG-0619. These valves are essential for repressurization of the exhaust header following a scram and prevent excessively rt.,5 CRD operating differential pressure during subsequent operation of a selected CRD. Successful post-modification testing does not necessarily include the conditions under which these valves are needed. Therefore, we will require I
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,. your comitment to install these valves; such commitment should be sent within 60 days of receipt of this letter. With regard to the flush port installation [Section 8.1(4)(b')] and the replacement of carbon steel pipe
[ sect 13n 8.1(4)(c')], we will require more information, specifically the procedr res and frequency of performance, regarding your augnented methods e
to assure no CRD degradation due to corrosion products. We also will require your commitment regarding the inservice inspection requirements of Sections 8.2(3)(a) and 8.2(3)(b) of NUREG-0619. The commitment and infomation should be forwarded within 60 days of receipt of this letter.
OMB cleararice is not required for this request since it is being transmitted to nine or fewer addressees.
If you have any questions, please do not hesitate to contact your project manager.
Sincerely, ORIGm SIGIED BY Thomas A. Ippolito, Chief Operating Reactors Branch #2 Division of Licensing cc: See next page f
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Docket File NSIC NRC PDR TERA Local PDR ACRS (10)
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T. Ippolito R. Clark S. Norris.
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N. Randall R. Klecker W. Hazelton K. Kniel d
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Mr. Hugh G. Parris cc:
li. S. Sanger, Jr., Esquire General Counsel Tennessee Valley Authority 400 Commerce Avenue E llB 33 C Knoxville, Tennessee 37902 1
Mr. Ron Rogers Tennessee Valley Authority 400 Chestnut Street, Tower II Chattanooga, Tennessee 37401 Mr. H. N. Culver-249A HBD 400 Commerce Avenue Tennessee Valley Authority Knoxville, Tennessee 37902 Robert F. Sullivan U. S. Nuclear Regulatory Commission Route 2, Box 311 Athens, Alabama 35611 Athens Public Library South and Forrest Athens, Alabama 35611 Mr. John F. Cox Tennessee Valley Authority W9-D 207C 4C0 Commerce Avenue Knoxville, Tennessee 37902 Mr. Herbert Abercrombie Tennessee Valley Authority P. O. Box 2000 Decatur, Alabama 35602 t
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