ML20045A410

Forwards Request for Addl Info Re Load Sequencers for Plant,To Continue Review of Licensee 930122 Application for License Amend

ML20045A410
Person / Time
Site:	Vogtle
Issue date:	06/07/1993
From:	Hood D Office of Nuclear Reactor Regulation
To:	Hairston W GEORGIA POWER CO.
References
TAC-M85700, TAC-M85701, NUDOCS 9306100214
Download: ML20045A410 (5)

Text

June 7, i993 Docket Nos. 50-424 Distribution and 50-425 Docket File-OGC 15G18 NRC/ Local PRDs ACRS (10) P-315 PDII-3 Reading E.Merschoff, RII S.Varga E.Tomlinson llE22 Mr. W. G. Hairston, Ill G.Lainas C. Grimes llE23 Senior Vice President -

D.Matthews S.Mitra 7E4 Nuclear Operations D. Hood A. Gill 7E4 Georgia Power Company L. Berry C.Berlinger 7El P. O. Box 1295 Birmingham, Alabama 35201

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION REGARDING LOAD SEQUENCERS, V0GTLE NUCLEAR GENERATING PLANT, UNITS 1 AND 2 (TAC NOS M85700 AND MS5701)

The NRC staff is reviewing your application of January 22, 1993, for license amendments to change the Vogtle Technical Specifications by adding requirements for the load sequencers.

Your written response to the enclosure is requested within 30 days of receipt of this letter.

If you have questions regarding the enclosure or are unable to meet the requested response date, contact me at (301) 504-3049.

This requirement affects fewer than ten respondents, and therefore, it is not subject to Office of Management and Budget review under P.L.96-511.

Sincerely,

/s/

Darl S. Hood, Senior Project Manager Project Directorate 11-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation

Enclosure:

Request for Additional In fo'.aat i on 0 90 U 3.i cc w/ enclosure:

See next page p?

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WASHINGTON, D.C. 2055fH)001 June 7, 1993 Docket Nos. 50-424 and 50-425 Mr. W. G. Hairston, III Senior Vice President -

Nuclear Operations Georgia Power Company P. O. Box 1295 Birmingham, Alabama 35201

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION RFGARDING LOAD SEQUENCERS, V0GTLE NUCLEAR GENERATING PLANT, UNITS 1 AND 2 (TAC NOS. M85700 AND M85701)

The NRC staf f is reviewing your application of January 22, 1993, for license amendments to change the Vogtle Technical Specifications by adding requirements for the load sequencers.

Your written response to the enclosure is requested within 30 days of receipt of this letter.

If you have questions regarding the enclosure or are unable to meet the requested response date, contact me at (301) 504-3049.

This requirement affects fewer than ten respondents, and therefore, it is not subject to Office of Management and Budget review under P.L.96-511.

Sincerely, AsTA hD O I Darl S. Hood, Senior Project Manager Project Directorate 11-3 Division of Reactor Projects - 1/II Office of Nuclear Reactor Regulation

Enclosure:

Request for Additional Information cc w/ enclosure:

See next page

q Mr. W. G. Hairston, III Georgia Power Company Vogtle Electric Generating Plant CC:

Mr. J. A. Bailey Harold Reheis, Director Manager - Licensing Department of Natural Resources Georgia Power Company 205 Butler Street, SE. Suite 1252 P. O. Box 1295 Atlanta, Georgia 30334 Birmingham, Alabama 35201 Attorney General Mr. W. B. Shipman Law Department General Manager, Vogtle Electric 132 Judicial Building Generating Plant Atlanta, Georgia 30334 P. O. Box 1600 Waynesboro, Georgia 30830 Mr. Alan R. Herdt Project Branch #3 Regional Administrator, Region II U. S. Nuclear Regulatory Comission U. S. Nuclear Regulatory Commission 101 Marietta Street, NW. Suite 2900 101 Marietta Street, NW., Suite 2900 Atlanta, Georgia 30323 Atlanta, Georgia 30323 Mr. Dan Smith Office of Planning and Budget Power Supply Operations Room 615B Oglethorpe Power Corporation 270 Washington Street, SW.

2100 East Exchange Place Atlanta, Georgia 30334 Tucker, Georgia 30085-1349 Mr. C. K. McCoy Charles A. Patrizia, Esquire Vice President - Nuclear Paul, Hastings, Janofsky & Walker Vogtle Project 12th Floor Georgia Power Company 1050 Connecticut Avenue, NW.

P. O. Box 1295 Washington, DC 20036 Birmingham, Alabama 35201 Art Domby, Esquire Mr. R. P. Mcdonald Troutman, Sanders Executive Vice President -

Nations Bank Plaza Nuclear Operations Suite 5200 Georgia Power Company 600 Peachtree Street P. O. Box 1295 Atlanta, Georgia 30308-2210 Birmingham, Alabama 35201 Resident Inspector Offi'ce of the County Comissioner U. S. Nuclear Regulatory Comission Burke County Comission P. O. Box 572 Waynesboro, Georgia 30830 Waynesboro, Georgia 30830 i

V ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION REGARDING

~ PROPOSED CHANGES TO TECHNICAL SPECIFICATIONS ON LOAD SEQUENCERS 1.

The NRC staff understands that the sequencer design at Vogtle is such that an inoperable sequencer will prevent automatic actuation of the diesel generator (DG) and Engineered Safety Features (ESF) loads in response to a design basis accident or event, regardless of the availability of offsite or onsite power.

With respect to this aspect of the Vogtle design, provide the following:

1.1 State whether the staff's understanding is correct and briefly describe the results of an inoperable sequencer at i

Vogtle.

(If the staff's understanding is not correct, discuss how the load sequencer functions and justify why l

load sequencer inoperability should be treated the same as the condition of one offsite power source and one DG inoperable.)

i 1.2 You propose an allowed outage time (A0T) of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> when one automatic load sequencer is inoperable.

Given Vogtle's load secuencer design and the result of an inoperable load sequencer, on what basis did you conclude that the condition of an inoperable load sequencer is not equivalent to a " dead bus" such that an 8-hour A0T corresponding to TS 3.8.3.1 would be appropriate?

If your basis credits manual starting of the DG and manual actuation of ESF loads, state whether procedures are in place for these actions and briefly describe these procedures and their compatibility with l

Vogtle accident analyses.

2.

Your proposed TS change would add a statement to Actions 14, 20, and 23 of Table 3.3-2 to instruct plant personnel to " apply the Action statement of Specification 3.8.1.1 for an inoperable load sequencer" if the instrumentation channels are inoperable due to an inoperable load sequencer.

In this respect, provide the following:

2.1 Discuss how an inoperable load sequencer causes j

instrumentation channels to become inoperable.

2.2 State the number of instrumentation channels made inoperable by each inoperable load sequencer.

2.3 Regarding Action 14, justify why the action of Specification 3.8.1.1 should be followed rather than the action (s) for an inoperable instrumentation channel with its associated completion time.

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> 3.

On page E2-2 of your request of January 22, 1993, you indicate that no specific LC0 for sequencers is required in Modes 5 and 6.

It is not clear from this discussion what impact an inoperable sequencer would have upon DG functions in these modes.

Discuss the need for automatic starting and some automatic loading of the DGs in Modes 5 and 6.

Include in this discussion how the sequencer operation impacts DG starting and automatic loading of DG support systems (e.g., service water, ventilation) in Modes 5 and 6.

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