ML20029A692
| ML20029A692 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 02/27/1991 |
| From: | Wallace E TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9103040006 | |
| Download: ML20029A692 (4) | |
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FEB 271991 U.S. Nuclear Regulatory Commission ATTNt Document Control Desk Washington, D.C.
20$55 Gentlement In the Matter of
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Docket Nos. 50-259 Tennessee Valley Authority
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50-260 50-296 BROWN 3 FERRY NUCLEAR PLANT (BFN) - CONTAINMENT ISOLATION VALVES ASSOCIATED WITH THE CONTAINHENT ATHOSpHERIC DILUTION SYSTEM References 1)-TVA letter, dated August 2, 1988, BFN Technieni Specification No. 251 - Table 3.7.A - Containment i
luolation Valves j
- 2) TVA letter, dated July 3, 1990, BFN Technient Specification No. 284 - post-Accident Sampling System and Automatic Depressurization System The referenced letters submitted requests for amendments to the UPN Technical' Specifications. These submittals included proposed revisions-to Table 3.7.A, " primary Containment isolation Valves." IVA and NRC met j
on February 6,1991, and held a teleconference on February 13, 1991. to l
discuss the. containment isolation provisions associated with the Containment Atmosphere Dilution (CAD) system lines which provido nitrogen to the Automatic Depressurization System accumulators.
1 NRC expressed;a concern hith the adequacy of the current system configuration from a containment isolation reliability standpoint. The-current arrangement considers one check valve inside containment and two check valves in para 1101 outside containment as primary containment
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isolation valven. _NRC requested TVA consider using the normally closed
' manual valves <on the CAD lines as the containment isolation valve in lieu e of the outboard-check valve.
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FEB 271991 2
U.S. Nuclear Regulatory Commicolon In responso to this concern, TVA has successfully performed local leak rate testing of these valves (2-84-613, 2-84-614, 2-84-674, and 2-84-675).
TVA will replace the Unit 2 outboard CAD primary containment check valvo in each train with a qualified nori.antly closed solenoid valvo and a normally clocod manual bypace valvo prior to restart from the next refueling outage.
TVA will submit a Technical Specification amendment requent to formally cite these valvoo ac primary containment isolation valves within one hundred twenty days after Unit 2 restart.
TVA will request thic Technical Specification amendment bo impicmented prior to restart from the next Unit 2 refueling outage.
Ao part of the l
implementation of this Technical Specification TVA will formally include these valves in the 10 CFR 50, Appendix J " primary Reactor Containment 1.eakago Testing for Water-Cooled power Reactors" program.
A similar modification will be implemented on Browns Ferry Units 1 and 3 prior to the restart of each respectivo unit.
-TVA believes those actions and commitmento resolvo the NRC concerns regarding this issue.
Ao previounty requented TVA requests the issuance of the referenced Technical Specifications ao soon ac possible in order to support the return to service of Browns Ferry Unit 2.
A summary list of commitments contained in this letter is enclosed.
If you have any questions, pleano contact patrick P. Carter, Manager of Site Licencing, at (205) 729-3570.
Very truly yours.
TENNESSEE VAL. LEY AUTil0HITY 4
vi pt E. G.
aIlac, Mana or Nucica 1.icensing a d Regulatory Affairs Enclosure cet Soo page 3 1
FEB 271991 U.S. Nuclear Regulatory Connlesion ec (F.nclosuro):
Ms. S. C. Black, Deputy Director Project Directorate 11-4 U.S. Nuclear Regulatory Connission One White Flint, North 11555 Rockville Pike, Rockvillo, Maryland 20852 URC Resident Inspector firowns Ferry Nuclear Plant Route 12, Box 637 Athens, Alabama 35609-2000 Mr. Thierry M. Ross, Project Manager U.S. Nuclear Regulatory Connion'
- One White Flint Dorth 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. Wilson, Project Chief U.S. Nuc1 car Regulatory Connlosion Reglon 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 i
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ENCLOSURE BROWNS FERRY NUCt. EAR PLANT -
SUMMARY
OF COMMITHENTS 1.
TVA will replace the Unit 2 outboard Containment Atmosphere Dilution primary containment check valvo in each trein with a qualifiod not,nally closed solenoid valve and a norme11y closed manual bypass valve prior to restart from the nex' refueling outato.
A similar modification will be implemented on Browns Ferry Units 1 and 3 prior to the restart of each respectivo unit.
2.
TVA will submit a Technical Speciftestion amendment request to fot,nally cite these valves as primary containment isolation valvos within one hundred twenty days afLer Unit 2 restart.
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