ML18031A525
| ML18031A525 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 06/26/1986 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | Muller D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.E.4.1, TASK-TM GL-84-09, GL-84-9, TAC-55953, TAC-55954, TAC-55955, NUDOCS 8607020303 | |
| Download: ML18031A525 (6) | |
Text
ACCESSION NBR FAC IL: 50-25g 50-260 50-2g6 AUTH. NANE QRIDLEY, R.
RECIP. NANE I')ULLER, D. R.
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INFORNATION DISTR IBUTI ON STEt': ( R IDB) 8607020303 DOC. DATE: 86/06/26 NOTARIZED:
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Tennessee 050002g6 AUTHOR AFFILIATION Tennessee Valley Authority RECIPIENT AFFILIATION BWR Prospect Directovate 2
SUBJECT:
Requests acceptance of'ent pov tion of-containment atmosphev'e dilution sgs. Based on BWR Owners Qi oup technical evaluation v e incrt BWR containments>
ov iginal designs meet NUREQ-0737. Xtem XX. E. 4.
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TENNESSEE VALLEYAUTHORITY CHATTANOOGA, TENNESSEE 31401 5N 157B Lookout Place JUN 26 $86 Director of Nuclear Reactor Regulation Attention:
Mr. D. R. Muller, Project Director BWR Project Directorate No.
2 Division of Boi.ling Water Reactor Licensing, U.S. Nuclear Regulatory Commission Washington, D.C., 20555
Dear Mr. Muller:
In the Matter of the Tennessee Valley Authority Docket Nos.
50-259 50-260 50-296 By TVA letter from L. M. Mills to H. R. Denton dated July 16, 1981, we informed NRC that our position regarding item II.E.4.1 of NUREG-0737 would be to modify the vent portion of the Containment Atmosphere Dilution (CAD) system at Browns Ferry Nuclear Plant (BFN) to bring it into strict conformance with single failure criteria.
Subsequent to our commitment, to modify the CAD vent
- system, new information, developed by the Boiling Water Reactor Owners'roup (BWROG) to support exemption of inerted Mark I containments from the hydrogen recombiner requirements of 10 CFR 50.44, has prompted a reevaluation of that position.
By letter from T. J.
Dente to D.
G. Eisenhut dated August 12, 1982, the BWROG provided a technical evaluation which shows that inerted BWR containments do not rely upon purge/repressurization systems for combustible gas control.
The analysis is being applied to BFN by way of Generic Letter 84-09.
The generic letter requires that plants having a "safety grade" purge/repressurization system must continue to have that system, even though it may be determined the plant does not rely upon it as the primary means of hydrogen control.
BFN's CAD system is designed to the requirements delineated in Safety Guide 7, Control of Combustible Gas Concentrations in Containment Following a Loss-of-Coolant Accident.
This Safety Guide states that the ventilation system need not be redundant.
Because it is not reuired for combustible gas control as shown by the Owners'roup evaluation, the present CAD vent system design is acceptable.
8b07020303 SbOb26 PDR ADOCK 05000259 P
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Director of Nuclear Reactor Regulation JUN 26 gg In conclusion, the vent portion of the CAD system meets the original design basis requirements for BFN, and recent analyses support. the conclusion that there is no need to upgrade that system beyond those requirements.
Me therefore, believe item II.E.4.1 of NUREG-0737 should be closed without further modifications.
Please inform us of the results of your review of our revised position.
Very truly yours, TENNESSEE VALLEY AUTHORITY R. Gridley, irector Nuclear Safety and Licensing cc:
Mx. R. J. Clark U.S. Nuclear Regulatory Commission Browns Fexry Project Manager 7920 Noxfolk Avenue
- Bethesda, Maryland 20814 U.S. Nuclear Regulatory Commission Region II ATTN:
Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, NM, Suite 2900 Atlanta, Georgia 30323
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