ML20147B870

Advises That short-term Insp of Defects in Westinghouse Circuit Breakers Will Not Occur Before Unit 2 Restart Due to Absence of High Probability of Significant Specific Deficiency,Per NRC Bulletin 88-001.Stated List Encl

ML20147B870
Person / Time
Site:	Sequoyah
Issue date:	02/27/1988
From:	Gridley R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
IEB-88-001, IEB-88-1, NUDOCS 8803020230
Download: ML20147B870 (12)

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TENNESSEE VALLEY AUTHORITY I CH ATTANOOGA. TENNESSEE 37401 5N 1578 Lookout place f

l FEB27 98  !

i U.S. Nuclear Regulatory Conunission  !

'ATTW: . Document Control Desk I Washington, D.C. 20555 I ,

t Gentlemen:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 SEQUOYAH NUCLEAR PLANT (SQN) - NRC BULLETIN NUMBER 88-01: DEFECTS IN WESTINGHOUSE CIRCUIT BREAKERS t

References. 1. NRC Dulletin Number 88-01: Defects in Westinghouse. Circuit Breakers, dated February 5, 1988

2. Westinghouse Technical Bulletin W8IB-TB-87-11. "Westinghouse Circuit Breakers Type DS/DSLt Welds on Breaker's pole Shatt "

dated December 1,1987 TVA has determined that the short-term inspections in reference 1 will not be performed before unit 2 restart. This determination is based on evalu? tion of the restart requirement criteria described in volume 2 of the Nuclear Performance Plan and found in Appendix A of Standard practice SQA190, "Restart Item Origination and Sequoyah Activities List Disposition." Acenrding to the criteria, resolution would be required before restart only if there was a high probability of causing a significant specific d-nciency. A significant specific deficiency is a deficiency identi^ied as having a significant probability of leading to the incperability of a system required for startup or operation by the appropriate technical specifications. Reference 2 provides infonnation from Westinghouse Electrie; Corporation indicating that the malfunction of the DS-416 breaker is considered a random occurrence. The subject breaker, with its poor quality weld, operated through approximately 3000 cycles before failure. Westinghouse DS-416 breakers have performed satisfactorily for many thousands of cycles. Additionally, it is necessary for part tolerances to be near maximum before a weld separation causes breaker failure. Based on this guidance from Westinghouse, it has.been determined l that there is not a h8.sh probability of a significant specific deficiency.

l Therefore, the shi F,-tens inspectiens will not be performed before unit 2

( restart.

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FEB 271988 U.S. Nuclear Ret;ulatory Comission The reactor trip breakers at SQN are not , Westinghouse DS or DSL breakers; they are Westinghouse rodel DB-50. SQN h,as a total of 12 DS-416 and 117 DS-206 breakers in Class 1E app Heations for both units. Enclosure 1 provides a listing of the location and' function of each of these Westinghouse DS breakers. The required short-term and long-term inspections will be performed on these breakero by the end of the unit 2 cycle 3 refueling outage at the latest. The breakers required for unit 1 operation will have the short-term and long-tem inspections completed before restart of unit 1. Forty-nine of the breakers on the enclosed list have surveillance scheduled by the middle of March. The short-term inspections will be performed on these breakers in conjunction with the scheduled surveillance.

If you have any questions, please telephone Kathy S. n'hitaker at (615) 870-7748.

Very truly yc,urs.

TENNESSEE VALLEY AUTHORITY 9

R. Cel, ey, Director Nuclekt Licensing and Regulatory Affairs Enclosures cc: (Enclosures):

Mr. K. P. Barr, Acting Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Comission hegion II 101 Marietta Street. IN, Suite 2900 Atlanta, Georsia 30323 Mr. G. G. Zech Assistant Director for Projects TVA Projects Division l'.S. Nuclear Regulatory Comission One White Flint, North  ;

11555 Rockville Pike i Rockville, Maryland 20852 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379

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I Enclosure 1 Location and Function of Westinghouse DS Breakers-i L

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Note: 'The abbreviations for'the loads listed in the table represent plant labels and standerd SQN abbreviations. '

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'480-V SliUTDOWN BOARD 1Al-A Panel Breaker Number Type Breaker Identification Load 2B DS-206 SQN-0-BCTB-311-0020-A CONTROL ROOM AHU A-A 2C DS-416 SQN-1-BCTB-030-0103 AUX BLDG GENERAL SUPPLY FAN 1A 3A DS-206 SQN-0-BCTB-078-0012-A SPENT FUEL PIT PirMP A-A 3B DS-206 SQN-1-BCTB-030-0083-A CRDM COOLEE FAN 1A-A 3C DS-%'i SQN-1-BCTB-030-0074 REACTOR LOWER COMP COOLER FAN 1A 4B DS-206 SQN-1-BCTB-070-0046-A COMPONENT COOLING SYSTEM PUMP 1A-A 8B DS-206 SQN-1-BCTB-201-DJ/8B-A NOR FDR REACTOR MOV BD 1Al-A ALTN FDR REACTOR MOV BD 1A2-A 9B DS-206 SQN-1-BCTB-201-DJ/9B-A NOR FDR REACTOR VENT BD 1A-A ALTN FDR CONT & AUX BLDG VENT BD 1A2-A 10A DS-206 $QN-0-BCTB-250-DJ/10A-A NOR FDR 125V VITAL BTRY JHRG I 10B DS-206 SQN-1-BCTB-201-DJ/108-A NOR FDR CONT & AUX BLDG VENT BOARD 1Al-A 10C DS-206 SQN-1-BCTB-030-0038-A CONTAINMENT AIR RETURN FAN 1A-A 11A DS-206 SQN-0-BCTB-250-DJ/11A ALTN FDR 250V BTRY CFRG NO. 1 11B DS-206 SQN-1-BCTB-201-DJ/11B-B NOR FDR 480V DIESEL AUX BD 1Al-A ALTN FDR 480V DIESEL AUX BD 1A2-A

480-V SHUTDOWN BOARD 1A2-A Panel Breaker Number Type Breaker Identification Load 2B DC-206 SQN-0-BCTB-313-0323-A SHUTDOWN BOARD ROOM AHU 1A-A DS-416 AUX BLDG CENgr:4L EXHAUST FAN 1A 2C SQN-1-3CTB-030-0159 3B DS-206 SQN-1-ETTB-030-0088-A CRDM COOLER FAN IC-A 3C DS-416 SQN-0-BCTB-G26-0001A-A FIRE PUMP 1A-A 3D DS-206 SqN-0-BCTB-032-0025 CONTROL & SERVICE AIR COMPRESSOR A 4B DS-206 SQN-1-BCTB-030-0077 REACTOR LOWER COMPT COOLER FAN 1C AC DS-206 SQN-0-BCTC-070-0051-A COMPONENT COOLING SYSTEM PUMP C-S (t_LTN FDR) 4D DS-206 SQN-0-BCTB-311-0126A-A CONTROL ROOM AIR COND COMPRESSOR A-A 8B DS-206 SQN-1-BCTB-201-DK/8B-A ALTN FDR REACTOR MOV BD 1Al-A NOR FDR REACTOR MOV BD 1A2-A 9B DS-206 SQN-1-BCTB-201-DK/9B-A ALTN FDR CONT & A'? BLDG VENT BD 1 Al-A 90 DS-20A SQN-1-BCTB-247-DK/9C-A STANDBY LIGHTING CAB NO. A XFMR 10A DS-206 SQN-0-BCTB-250-DK/10A-A ALTN FDR 125V VITAL BTRY CHRG II 10B DS-206 SQN-1-BCTB-201-DK/10B-A ALTN FDR 480V REACTOR VENT BOARD 1A-A NOR FDR CONT & AUX BLDG VENT BD 1A2-A 11A DS-206 SQN-0-BCTB-250-DK/11A-A NOR FDR SPARE 125V VITAL BTRY CHRG 1-S 11C DS-206 SQN-1-BCTB-201-DK/11C-A ALTN FDR 480V DIESEL AUX BD 1Al-A NOR FDR 480V DIESEL AUX BD 1A2-A

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480-V SHUTDOWN BOARD 1B1-B Panel Breaker Number Type Breaker Identification Load 2C DS-416 SQN-1-BCTB-030-0102 AUX BLDG GENERAL SUPPLY FAN 1B .

3B DS-206 SQN-1-BCTB-030-0092-B CRDM COOLER FAN 1B-B 3C DS-206 SQN-1-BCTB-070-0038-B COMPONENT COOLING SYSTEM PUMP 1B-B 3D DS-206 SQN-0-BCTB-032-0026 CONTROL AND SERVICE AIR COMPRESSOR B AB DS-206 SQN-1-BCTB-030-0075 REACTOR LOWER COMPT COOLER FAN 1B 4D DS-206 SQN-1-BCTB-062-0101 RECIPROCATING CHARGING PUMP 8B DS-206 SQN-1-BCTB-201-DL/8B-B NOR FDR REACTOR MOV BD 1B1-B ALTN FDR REACTOR MOV BD 1B2-B 8D DS-206 SQN-1-BCTB-247-DL/8D-B STANDBY LIGHTING CAB No. 2 XFMR 9B DS-206 SQN-1-BCTB-201-DL/9B-B NOR FDR REACTOR VENT BD 1B-B ALTN FDR CONT & AUX BLDG VENT BD 1B2-B 10A DS-206 SQN-0-BCTB-250-DL/10A-B ALTN FDR 125V VITAL BTRY CHRG I 10B DS-206 SQN-1-BCTB-201-DL/10B-B NOR FDR CONT & AUX BLDG VENT BD 1B1-B 11A DS-206 SQN-0-BCTB-250-DL/11A-B ALTN FDR SPARE 125V VITAL BTRY CHRG 1-S 11B DS-206 SQN-1-BCTB-201-DL/llB-B ALTN FDR 480V DIESEL AUX BD 1B2-B NOR FDR 480V DIESEL AUX BD 1B1-B 1

480-V SHUTDOWN BOARD 1B2-B Panel Breaker Number Type Breaker Identification Load ID DS-206 SQN-0-BCTB-311-0023-B CONTROL ROOM AHU B-B 2B DS-206 SQN-0-BCTB-311-0141A-B CONTROL ROOM AIR COND COMPRESSOR B-B 2C DS-416 SQN-1-BCTB-030-0162 AUX BLDG CENERAL EXHAUST FAN 1B 3A DS-206 SQN-0-BCTB-313-0358-B SHUTDOWN BD ROOM AHU IB-B 3B DS-206 SQN-1-BCTB-030-0080-B CRDM COOLER FAN 1D-B 30 DS-416 SQN-0-BCTB-026-0004A-B FIRE PUMP 1B-B 3D DS-206 SQN-0-BCTB-313 -tM/3D-B SHUTDOWN BD ROOM WTR CHILLER PKG B-B 4C DS-206 SQN-1-BCTB-303-DM/4C UNIT 1 REACTOR BLDG CRANE AD DS-206 SQN-0-BCTB-201-DM/4D EMERG FDR TO 480V AUX BLDG  :

COMMON BOARD (BUS A)

SD DS-206 SQN-1-9CTB-030-0078 REACTOR LOWER COMPT COOLER FAN 1D 8A DS-206 SQN-0-BCTB-078-0035-B SPENT FUEL PIT PUMP C-S (ALTN SUPPLY) 8B DS-206 SQii-1-BCTB-201-DM/8B-B NOR FDR REACTOR MOV BD 1B2-B ALTN FDR REACTOR MOV BD 1B1-B 9B DS-206 SQN-1-BCTB-201-DM/9B-B ALTN FDR CONT & AUX BLDG VENT BD IB1-B 9C DS-206 SQN-1-BCTB-030-0039-B CONTAINMENT AIR RETURN FAN 1B-B 10A DS-206 SQN-0-BCTB-250-DM/10A-B NOR FDR 125V VITAL BTRY CHRG II 10B DS-206 SQN-1-BCTB-201-DM/10B-B ALTN FDR 480V REACTOR VENT BD 1B-B NOR FDR CONT & AUX BLDG VENT BD 1B2-B 10D DS-206 SQN-1-BCTB-047-0061/1 MAIN TURBINE TURNING GEAR OIL PUMP 11A DS-206 SQN-0-BCTB-250-DM/11A ALTN FDR 250V SPARE BTRY CHRG 1 l

11B DS-206 SQN-1-BCTB-201-DM/11B-B ALTN FDR 480V DIESEL AUX BD 1B1-B )

NOR FDR 480V DIESEL AUX BD 1B2-B 11C DS-206 SQN-0-BCTB-030-0139 FUEL HANDLING EXHAUST FAN B l

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480-V SHUTDOWN BOARD 2Al-A Panel Breaker Number Trpe Breaker Identification Load 2B DS-206 SQN-0-BCTB-311-0027-A ELECTRIC BD ROOM AHU A-A 2C DS-416 SQN-2-BCTB-030-0104 AUX BLDG CENERAL SUPPLY FAN 2A 3B DS-206 SQN-2-BCTB-030-0083-A CRDM COOLER FAN 2A-A 3C DS-206 SQN-2-BCTB-030-0074-A REACTOR LOWER COMP COOLER FAN 2A-A AB DS-206 SQN-2-BCTB-070-0059-A COMPONENT COOLING SYSTEM PUMP 2A-A 4D DS-206 SQN-0-BCTB-067-0270-A COOLING TOWER FAN A-A 8A DS-206 SQN-0-BCTB-078-0035-A SPENT FUEL PIT PUMP C-S (NO2 SUPPLY) 8B DS-206 SQN-2-BCTB-201-DN/8B-A NOR FDR REACTOR MOV BD 2Al-A ALTN FDR REACTOR MOV BD 2A2-A 8C DS-206 SQN-0-BCTB-062-DN/8C CVC SYSTEM HEAT TRACE XFMR A1 9B DS-206 SQN-2-BCTB-201-DN/9B-A NOR FDR REACTOR VENT BD 2A-A ALTN FDR CONT & AUX BLDG VENT BD 2A2-A 10A DS-206 SQN-0-BCTB-250-DN/10A-A NOR FDR 125V VITAL BTRY CHRG III 10B DS-206 SQN-2-BCTB-201-DN/10B-A NOR FDR CONT & AUX BLDG VENT BD 2Al-A 10C DS-206 SQN-2-BCTB-030-0038-A CONTAINMENT AIR RETURN FAN 2A-A 11A DS-206 SQN-0-BCTB-250-DN/11A ALTN FDR 250V BTRY CHRG NO. 2 11B DS-206 SQN-2-BCTB-201-DN/11B-A NOR FDR 480V DIESEL AUX BD 2Al-A ALTN FDR 480V DIESEL AUX BD 2A2-A

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l 480-V SHUTDOWN BOARD 2A2-A Panel Breaker Number Type Breaker Identification Load 2B DS-206 SQN-0-BCTB-313-0332-A SHUTDOWN BOARD ROOM AHU 2A-A 2C DS-416 SQN-2-BCTB-030-0274 AUX BLDG GENERAL EXHAUST FAN 2A 3B DS-206 SQN-2-BCTB-030-0088-A CRDM COOLER FAN 2C-A 3C DS-416 SQN-0-BCTB-026-0009A-A FIRE PUMP 2A-A 3D DS-206 SQN-0-BCTB-067-0271-A COOLING TOWER FAN B-S AB DS-206 SQN-2-BCTB-030-0077-A REACTOR LOWER COMPT COOLER FAN 2C-A 4C DS-206 SQN-0-BCTB-067-0272-A COOLING TOWER FAN C-S (ALTN FEEDER) 4D DS-206 SQN-0-BCTB-311-0156A-A CONTROL BLDG ELEC BD ROOMS AIR COND COMPRESSOR A-A SD DS-206 SQN-0-BCTB-313-D0/5D-A SHUTDOWN BDRM WATER CHILLER PKG A-A l I

8B DS-206 SQN-2-BCTB-201-D0/8B-A ALTN FDR REACTOR MOV BD 2Al-A NOR FDR REACTOR MOV BD 2A2-A 8C DS-206 SQN-0-BCTB-062-D0/8C CVC SYSTEM HEAT TRACE XFMR A3 9B DS-206 SQN-2-BCTB-201-D0/9B-A ALTN FDR CONT & AUX BLDG VENT BD 2Al-A )

l 9C DS-206 SQN-2-BCTB-247-D0/9C STANDBY LIGHTING CAB NO. 1 XFMR 10A DS-206 SQN-0-BCTB-250-D0/10A-A ALTN FDR 125V VITAL BTRY CHRG IV 10B DS-206 SQN-2-BCTB-201-D0/10B-A ALTN FDR 480V REACTOR VENT BD 2A-A NOR FDR CONT & AUX BLDG VENT BD 2A2-A 11A DS-206 SQN-0-BCTB-250-D0/11A-A NOR <DR SPARE 125V VITAL BTRY CHRG 2-S 11B DS-206 SQN-0-BCTB-030-0136 FUEL HANDLING EXRAUST FAN A 11C DS-206 SQN-2-BCTB-201-D0/11C-A ALTN FDR 480V DIESEL AUX BD 2Al-A NOR FDR 480V DIESEL AUX BD 2A2-A 1

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480-V SHUTDOWN BOARD 2B1-B Panel Breaker Number Type Breaker Identification Load .

2B DS-206 SQN-0-BCTB-067-0271-B COOLING TOWER B-S (ALTN SUPPLY) 2C DS-416 SQN-2-BCTB-030-0105 AUX BLDG GENERAL SUPPLY FAN 2B 2D DS-206 SQN-0-BCTB-078-0009-B SPENT TUEL PIT PUMP B-B 3A DS-206 SQN-0-BCTB-311-0028-B ELECTRIC BD ROOM AHU B-B 3B DS-206 SQN-2-BCTB-030-0092-B CRDM COOLER FAN 2B-B 3C DS-206 SQN-2-BCTB-070-0033-B COMPONENT COOLING. SYSTEM PUMP 2B-B 4B DS-206 SQN-2-BCTB-030-0075-B REACTOR LOWER COMPT COOLER FAN 2B-B AC DS-206 SQN-0-BCTB-067-0272-B COOLING TOWER FAN C-S (NORMAL SUPPLY) 4D DS-206 SQN-2-BCTB-062-0101 RECIPROCATING CHARGING PUMP 8B DS-206 SQN-2-BCTB-201-DP/8B-B NOR FDR REACTOR MOV BD 2B1-B ALTN FDR REACTOR MOV BD 2B2-B 8C DS-206 SQN-0-BCTB-062-DP/8C CVC SYSTEM HEAT TRACE XFMR B1 8D DS-206 SQN-2-BCTB-247-DP/8D STANDBY LIGHTING CAB NO. 3 XFMR 9B DS-206 SQN-2-BCTB-201-DP/9B-B NOR FDR RFACTOR VENT BD 2B-B ALTN FDR 480V CONT & AUX BLDG VENT BD 2B2-B l

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10B DS-206 SQN-2-BCTB-201-DP/10B-B NOR FDR CONT & AUX BLDG VENT BD 2B1-B l 11A DS-206 SQN-0-BCTB-250-DP/11A-B ALTN FDR SPARE 125V VITAL BTRY CHRG 2-S 11B DS-206 SQN-2-BCTB-201-DP/11B-B NOR FDR 480V DIESEL AUX BD 2B1-B ALTN FDR 480V DIESEL AUX BD 2B2-B i

480-V SHUTDOWN BOARD 2B2-B Panel Breaker Number Type Breaker Identification Load 2B DS-206 SQN-0-BCTB-311-0171A-B CONT BLDG ELEC BD ROOMS AIR COND COMPRESSOR B-B 20 DS-416 SQN-2-BCTB-030-0278 AUX BLDG GENERAL EXHAUST FAN 2B 2D DS-206 SQN-0-BCTB-070-0051-B COMPONENT COOLING SYS PUMP C-S (NOR FDR) 3A DS-206 SQN-0-BCTB-313-0367-B SHUTDOWN BD ROOM AHU 2B-B 3B DS-206 SQN-2-BCTB-030-0080-B CRDM COOLER FAN 2D-B 3C DS-416 SQN-0-BCTB-026-0011A-B FIRE PUMP 2B-B 4B DS-206 SQN-0-BCTB-067-0273-B COOLING TOWER FAN D-B 4C DS-206 SQN-2-BCTB-303-DQ/4C UNIT 2 REACTOR BLDG CRANE AD DS-206 SQN-0-BCTB-201-DQ/ 4 D EMERG FDR TO 480V AUX BLDG COM BD (BUS B) 5D LS-206 SQN-2-BCTB-030-0078-B REACTOR LOWER COMPT COOLER FAN 2D-B 8B DS-206 SQN-2-BCTB-201-DQ/8B-B NOR FDR REACTOR MOV BD 2B2-B ALTN FDR REACTOR MOV BD 2B1-B 8C DS-206 SQN-0-BCTB-062-DQ/8C CVC SYSTEM HEAT TRACE XFMR B3 9B DS-206 SQN-2-BCTB-201-DQ/9B-B ALTN FDR CONT & AUX BLDG VENT BD 2B1-B l 9C DS-206 SQN-2-BCTB-030-0039-B CONTAIRMENT AIR RETURN FAN 2B-B  ;

10A DS-206 SQN-0-BCTB-250-DQ/10A-B NOR FDR 125V VITAL BTRY CHRG IV l

10B DS-206 SQN-2-BCTB-201-DQ/10B-B ALTN FDR 480V REACTOR VENT BD 2B-B l NOR FDR CONT & AUX BLDG VENT BD 2B2-B  !

10D DS-206 SQN-2-BCTB-047-0061/1 MAIN TURBINE TURNING GEAR OIL PUMP I

11B DS-206 SQN-2-BCTB-201-DQ/11B-B ALTN FDR 480V DIESEL AUX BD 2B1-B NOR FDR 480V DIESEL AUX BD 2B2-B l l

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Enclosure 2 4 List of Commitments

1. SQN will complete the short-term and long-term inspections no later than startup following the unit 2 cycle 3 refueling outage.

2. The short-tenn and long-term inspections required for unit I will be -

completed before restart of unit 1. ,

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