ML20149E843

Forwards RAI Re Temporary Extension of Diesel Generator Allowed Outage Time for Plant,Units 2 & 3

ML20149E843
Person / Time
Site:	Browns Ferry
Issue date:	07/17/1997
From:	Williams J NRC (Affiliation Not Assigned)
To:	Kingsley O TENNESSEE VALLEY AUTHORITY
References
TAC-M99061, TAC-M99062, NUDOCS 9707210090
Download: ML20149E843 (4)

Text

Mr. Oliver D. Kingsley, Jr.

Presid:nt gTVA Nuclear and Chief Nuclear Officer July 17, 1997 Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801

SUBJECT:

BROWNS FERRY NUCLEAR PLANT UNITS 2 AND 3 - REQUEST FOR ADDITIONAL INFORMATION REGARDING TEMPORARY EXTENSION OF DIESEL GENERATOR ALLOWED OUTAGE TIME (TAC NOS. M99061 AND M99062)

Dear Mr. Kingsley:

On June 19, 1997, the Tennessee Valley Authority (TVA) requested amendments to the operating licenses for the Browns Ferry Nuclear Plant Units 2 and 3. The proposed amendments temporarily extend the allowed outage time from 7 to 14 days for the site emergency diesel generators to accommodate extensive preventive maintenance recommended by the vendor. The U. S. Nuclear Regulatory Commission staff has examined TVA's request, and has determined additional information is required to conplete its review. The required information is discussed in the enclosure.

Please call me at (301)415-1470 if you have any questions regarding this topic.

Sincerely, Original signed by l

Joseph F. Williams, Project Manager Project Directorate 11-3  !

Division of Reactor Projects - I/II I Office of Nuclear Reactor Regulation l Docket Nos. 50-260 and 50-296 I

Enclosure:

Request for Additional Information cc w/

Enclosure:

See next page Distribution

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Na$sn,RII DOCUMENT NAME: G/BFN/M99061.RAI To r:ceive a copy of this document, indicate in the box: "C" = Copy without attachment / enclosure "E" - Copy with attachment / enclosure "N" = No copy 0FFICE PDII-3/PM u lC PDII-3/LA E PDII-3/D ,) C NAME JWilliams f'F BClayton kW FHebdon %/

DATE 07/ /? /97 l' 07/ //7/97 07/l7 /97 0FFICIAL RECOR) COPY 9707210090 970717 DR ADOCK 050002 0 ,l ll ll lll,ll ll

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Mr. Oliver D. Kingsley, Jr. BROWNS FERRY NUCLEAR PLANT Tennessee Valley Authority cc:-

'Mr. O. J.'Zeringue, Sr. Vice President Mr. Timothy E. Abney, Manager Nuclear Operations Licensing and Industry Affairs Tennessee Valley Authority Browns Ferry Nuclear Plant 6A Lookout Place Tennessee Valley Authority 1101 Market Street P.O. Box 2000 Chattanooga, TN 37402-2801 Decatur, AL 35609 Mr. Jack A. Bailey, Vice President Regional Administrator Engineering & Technical Services U.S. Nuclear Regulatory Commission Tennessee Valley Authority Region II 6A Lookout Place 61 Forsyth Street, SW., Suite 23T85 1101 Market Street Atlanta, GA 30303-3415 Chattanooga, TN 37402-2801 Mr. Leonard D. Wert Mr. C. M. Crane, Site Vice Presider.t Senior Resident Inspector Browns Ferry Nuclear Plant Browns Ferry Nuclear Plant Tennessee Valley Authcrity U.S. Nuclear Regulatory Commission P.O. Box 2000 10833 Shaw Road Decatur, AL 35609 Athens, AL 35611 General Counsel Chairman Tennessee Valley Authority Limestone County Commission ET 10H 310 West Washington Street 400 West Summit Hill Drive Athens, AL 35611 Knoxville, TN 37902 State Health Officer 2

Mr. Raul R. Baron, General Manager Alabama Department of Public Health Nuclear Assurance and Licensing 434 Monroe Street Tennessee Valley Authority Montgomery, AL 36130-1701 4J Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. Masoud Bajestani, Plant Manager l Browns Ferry Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Decatur, AL 35609 Mr. Pedro Salas, Manager Licensing and Industry Affairs Tennessee Valley Authority 4J Blue Ridge >

1101 Market Street Chattanooga, TN 37402-2801 l

l

, , l 1[ j- ' BROWNS' FERRY NUCLEAR POWER PLANT

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UNITS 2 AND 3-REQUEST'FOR ADDITIONAL INFORMATION TEMPORARY EXTENSION OF EMERGENCY DIESEL GENERATOR ALLOWED OUTAGE TINE

1. Provide a description of work to.be performed during the planned 12-year diesel genentor preventive maintenance outage. Include schedules for this work, assuming:

a. All activities are completed within a single outage. j

b. Activities are split between two or more outages.

2. Describe how these activities were accommodated during previous 12-year l preventive maintenance outages.

]

3. Current technical specification (TS) 3.9.D.1 reads as follows:

Whenever standby gas treatment is required to be OPERABLE in accordance with Specification 3.7.B and/or control room emergency ventilation is required to be OPERABLE in accordance with ,

Specification 3.7.E, the associated diesel generator. aligned to supply emergency power to'that equipment shall be OPERABLE.

a. Standby gas treatment train A and/or control room emergency ventilation train A - Diesel generator 1/2A or 1/28.

l b. Standby gas treatment train B - Diesel generator 1/2D or

1/2B.  ;

c. Standby gas treatment train C - Diesel generator 3D.

Control room emergency ventilation train B - Diesel d.

j generator 3C or 3B.

l This specification apparently requires that certain diesel generators be i operable in order to consider standby gas treatment and control room emergency ventilation trains to be operable. In cases (a), (b), and.

(d), either of two diesel generators can fulfill this function. In case (c),-only diesel generator 3D can be used in order to consider standby .

gas treatment train C to be operable. TS 3.7.B.3 allows reactor power

! operation and fuel handling.to continue only for the succeeding 7 days with one train of standby gas treatment inoperable. Therefore, even if the allowed outage time for diesel generator 30 is extended to 14 days, it appears that TS 3.7.B.3 would not permit reactor power operation for more than 7 days.

. ENCLOSURE 4

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Page El-2 of TVA's June 19, 1997 submittal states that TS 1.C.2 provides l that, when the units are operating, the diesel generator limiting condition for operation governs the operability related to temporary ,

unavailability of on-site power sources, provided that all redundant l systems and subsystems are-available. However, the staff believes that TS 3,9.D.I.c governs the case if diesel generator 3D is inoperable, because it provides specific requirements for that case.

Therefore, the staff requests that TVA either provide additional information which demonstrates that TS 3.9.D.I.c will not result in invocation of TS 3.7.B.3 if diesel generator 3D is inoperable for more than 7 days, or provide additional TS changes eliminating this problem,  ;

including appropriate , justification for those changes.  !

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