ML20005G874

Approves 900105 Proposed Amends to Section 3/4.8.1.1, AC Sources to Permit Operation W/One Train of Diesel Generator Sets 1A-A & 2A-A or 1B-B or 2B-B Inoperable for 72 H W/O Shutting Down Units

ML20005G874
Person / Time
Site:	Sequoyah
Issue date:	01/18/1990
From:	Black S Office of Nuclear Reactor Regulation
To:	Kingsley O Tennessee Valley Authority
References
TAC-75567, TAC-75568 NUDOCS 9001230228
Download: ML20005G874 (3)

Text

. -...

gY

,n no&q 9,p

' UNITED STATES l

A NUCLEAR REGULATORY COMMISSION

{

J J

. wAsnmo1 row, o, c. rossa i

,g

.(

Docket Nos.!50-327:

January 18, 1990 and-50-328 b

..ME. Oliver _ D. Kingsley, Jr.

i Senior Vice President, Nuclear Power R

Tennessee Valley. Authority--

0 6N 38A Lookout Place;

!1101 Market Street.-

yg

, Chattanooga,~ Tennessee - 37402-2801

SUBJECT:

TECHNICAL SPECIFICATION CHANGE 90-04 (TAC 75567/75568) - SEQUOYAH NUCLEAR PLANT, UNITS 1-AND 2 i

-In your letter dated January 5,1990, you proposed amendments to Sec-tion 3/4.8.1.1 Alternating Current.(AC) Sources, of the Sequoyah Nuclear

- Plant. Units 1 and-2. Technical. Specifications (TSs). The proposed changes '

revise Action. Statement "a" of Limiting Condition for Operation (LCO)' 3.8.1.1 to allow continued operation of the units for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> with one. train of diesel

generator sets,1A-A and 2A-A or IB-B and 2B-B,- inoperable. With either train.

inoperable. the remaining AC sources listed in LCO 3.8.1.1 would be demon--

strated operable by performing surveillance requirement (SR) 4.8.1.1.1.a within one hour-and ~at least once-per eight hours thereafter and SR 4.8.1.1.2.a.4-within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, :The inoperable diesel generator sets would be returned to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or_the. units would.be shut down.

You' stated that the' Tennessee Valley Authority (TVA) is performing : maintenance and repairs on the essential raw cooling water (ERCW) strainers. This work

-requires isolation of_ the associated ERCW headers for approximately 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

Because there are two ERCW trains, one train =1s isolated at a time and that.

train and the equipment served by the train are declared inoperable. An inoper-able ERCW train requires entry into a 72-hour action statement which for the Unit 2 ERCW headers and strainers, is sufficient to perform the work, No equipment'which is supplied cooling water by the. Unit 2 ERCW train has an

, action statement requiring a unit shutdown in less than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

For the Unit 1 ERCW train, you have concluded that isolation of either of the Unit-1 headers will require the units to enter LC0 3.0.3 and shutdown within seven hours.

Since this is significantly less than the 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> required, you have proposed the amendments to the TSs.

Your conclusion was based on the fact that the Unit 1 ERCW train provides

. cooling water to the four emergency diesel generator sets.

Isolating either Unit'l header will render a train of diesel generator sets (i.e., IA-A and 2A-A orIB-Band 28-B) inoperable.

Your interpretation of the action statements for LCO 3.8.1.1 is that they do not apply to this situation of working on the ERCW i

strainers and, therefore, with either of the Unit 1 ERCW headers inoperable, LC0 3.0.3 applies.

9001230228 900118 PDR ADOCK 05000327 T

P PDC s

d'Q'.

l N

4['

r

I 2

p h

~ TVA has evaluated several options to maintain the' diesel generators operable f

during the Unit 1 ERCW strainer work.

It has concluded that each option requires a significant amount of engineering work and physical plant modifica-tions. You conclude that these options are not a prudent expenditure of resources.

You stated that the maintenance and repairs on the Unit 1 ERCW strainers are

- scheduled to begin on-January 19, 1990. This is based on environmental condi-

. tions (e.g.. temperature of the Tennessee River) and the impact on the Unit 1 E

Cycle 4 refueling outage which'is scheduled to begin in March 1990. Therefore, you have requested that this amendment be processed on an exigent basis.

L We,have reviewed your application and the Action Statements for LC0 3.8.1.1.

- We conclude that Action Statement "d" allows you to have a diesel generator train inoperable for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> before the units must begin shutting down.

This is consistent with the requirements in (1) the TSs for loss of a train of safety equipment. (2) the NRC Standard Technical Specifications for Westing-house Pressurized Water Reactors and (3) the design basis of the units.

Because Action Statement "d" is confusing on the loss of a single train of diesel n

generators, we will act on your' application. This will be the subject of a future. letter.: Until then, you may have a train of diesel generators inoper.

.able for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> without shutting down the units. Thereafter, as Action

- Statement d-states, you must have the units in Mode 3 within the next six hours and in Mode-5 within the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

Sincerely, Original signed by Suzanne C. Black, Assistant Director for Projects TVA Projects Division.

Office of Nuclear Reactor Regulation cc:..See next page Dis':ribution

- Ne totaftleaw B. Grimes NRC PDR E. Jordan Local PDR'

.ACRS(10)

SQN Rdg.

GPA/CA ADSP Rdg.

J. Donohew D. CrcMieM OGC T. Quay B. D. Liaw S. Black R. Pierson B. Wilson L. Watson

-J. Brady LA 0FC.: NRF T

jM : hRR:.R BC :TVA:AD/IP

TVA:ADAP

.... :..J Q...

....:....g.____:---...__....:...... -_.. :--...--..

NAME

J

EMa i os

RPi n

SBlack

.....:... __...._:.__..__..:..........:..__7____...:

-DATE :1/

/90

1//7/90

1/ g /90

1//',6 /90 OFFICIAL RECORD COPY'

> Document'Name: TS CHANGE 90-04

4#

3 i

.Tennesgee Valley Authority L

'cc w/ enclosure:

General Counsel Mr. Kenneth M. Jenison Tennessee Valley Authority Senior Resident Inspector

'400 West Sumit Hill Drive Sequoyah Nuclear Plant

-ET 118.33H U.S Nuclear Regulatory Commission Knoxville,' Tennessee 37902 2660 Igou Ferry Road 1

Soddy Daisy, Tennessee 37379 Mr. F. L. Moreadith Vice President, Nuclear Engineering Mr. Michael H. Mobley, Director.

j Tennessee Valley Authority Division of Radiological Health

.400 West Summit Hill Drive T.E.R.R.A. Building, 6th Floor a

~WT 12A 12A 150 9th Avenue North Knoxville, Tennessee 37902 Nashville, Tennessee 37219-5404 l

-Dr. Mark 0. Medford Dr. Henry Nyers, Science Advisor i

Vice. President and Nuclear Committee on Interior Technical Director, and Insular Affairs Tennessee. Valley Authority U.S. House of Representatives 6N 38A Lookout Place Washington, D.C.: 20515 Chattanooga, Tennessee. 37402-2801 Tennessee Valley Authority Manager,: Nuclear Licensing Rockville Office i

and Regulatory Affairs.

11921 Rockville Pike-Tennessee Valley Authority Suite 402 Sh-1578 Lookout Place -

Rockville, Maryland 20852 Chattanooga, Tennessee 37402-2801 Mr.. Joseph -Bynum Acting Site Director Sequoyah Nuclear Plant

' Tennessee Valley Authority P. 0.. Box 2000 Soody Daisy, Tennessee 37379 Mr. Mark J. Burzynski Site Licensing Manager Sequoyah Nuclear Plant P. O. Box 2000

. Soddy Daisy,., Tennessee 37379 County. Judge Hamilton County Courthouse Chattanooga,-Tennessee 37402 Regional Administrator, Region II U.S.= Nuclear Regulatory Comission

'101 Marietta Street, N.W.

Atlanta, Georgia 30323