ML20093H999

Forwards Supplemental Response to Generic Ltr 83-28, Required Actions Based on Generic Implications of Salem ATWS .... Historic Data File of post-trip Review Maintained on Prime Computer for 7 Days at 1-minute Intervals

ML20093H999
Person / Time
Site:	Byron
Issue date:	10/10/1984
From:	George Alexander, Alexander G 1 COMMONWEALTH EDISON CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
9284N, GL-83-28, NUDOCS 8410160456
Download: ML20093H999 (20)

Text

-

'o .e , .f'T Conwnonwealth Edison

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) one Fust Nati;nII Pir2a, Chicago, Ilhnois i C ~] Addriss Heply to: Pzst Offica Box 767

\ Chicago, Illinois 60690 October 10, 1984 Mr. Harold R.'Denton, Director Office ~of Nuclear Reactor Regulation

-U.S.-Nuclear' Regulatory Commission Washington,-.DC 20555 Sub' ject: Byron Station Units 1 and 2 Supplemental Response to Generic Letter No. 83-28, " Required Actions Based on Generic Implications of Salem ATWS Events" NRC Docket Nos. 50-454/455 References (a): Generic Letter No.-83-28 D. G. Eisenhut letter to All OLs and cps dated July 8, 1983 (NL-83-0003)

(b): P.'L. Barnes to H. R. Denton letter dated November 5, 1983 (NL-83-0520)

(c): P. L. Barnes to H. R. Denton letter dated February 29, 1984 (NL-84-0254)

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(d): P.:L.-Barnes to H. R. Denton letter dated June 1, 1984 C

Dear Mr. Denton:

Reference (a) requested that the Commonwealth Edison Company provide a written report of the status of current conformance 'with positions contained .in the subject letter.

'Re.ferences _(b) , (c) and (d) provided the. status.

The attachment to this letter supplements the positions as reported in References (b), (c) and (d).

To the best of my knowledge and belief the statements contained in the Attachment are true and correct. In some respects these statements are not based on my personal knowledge but upon information furnished by other Commonwealth Edison employees, consultants and contractors. Such information has been reviewed in 1accordance with Company practice and I believe it to be reliable.

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Please address any questions that you or.your staff may

'have concerning our response to Generic -Letter No. 83-28 to this a f fice'. .

Respectfully, G. L. Alexander Nuclear Licensing Administrator Attachment' cc: U.S. NRC, Document Control Desk Washington, DC 20555 L. N. Olshan .LB1 J. G. Keppler - RIII.

RIII Inspectors - SY SUBSCRIBEDi;and SWORN to before me this & Lday

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, 1984 osusl0 $- ,

Notary Public 9284N

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6 J ATTACHMENT-COMMONWEALTH EDISON' COMPANY Supplemental: Response to Generic Letter-No. 33-28

" Required-Actions Based on Generic Implications of Salem ATWS Events" i (f.. . . .

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. Item.1.2 Post-Trip Review Data and Information Capability

2. Capability for assessing the time history of analog variables needed to determine the cause of unscheduled reactor shutdowns, and the functioning of safety-related equipment.

3. Duration of time history-(minute.before trip and minutes after trip).

RESPONSE

The-historic data file is maintained on the Prime Computer for seven days at one minute intervals.

'4.- Format for displaying date including scale (readability) of time histories.

RESPONSE

The historic data file on the Prime can be presented in several formats. The data can be trended visually or on hard copy. The data can be plotted both visually or on hard copy. Although the smallest time increment would be one minute (limited by data collection), the time frames can be expanded, as well as the scale for the units can be varied.

5. Capability for retention of data, information, and 1 physical evidence (both hardware and software).

RESPONSE

g The historic data file is stored every minute for seven days.

6. Power source (s) (e.g., Class IE, non-Class IE, non-interruptable).

RESPONSE

n Power sources for both the process computer and prime computer are non-interruptable, being fed from inverters with'DC backups.

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3. Other. data and information provided to assess the cause of unscheduled reactor shutdowns.

RESPONSE

Byron Statin can obtain additional information and data from strip chart recorders, operator logs, and personnel observatin and knowledge as documented in BGP A 13.

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Schedule for any planned changes to existing' data and information capability.

RESPONSE

The communication' link between the Process and Prime

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Computers is to be-replaced with a high speed _

communication link. This will al.'ow more frequent da+a-samples and a more reliable data link. Installation is scheduled for the third quarter of 1985..

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2.1 Equipment

Classification and Vendor Interface (Reactor Trip. System Components) 2.2 Equipment _ Classification and Vendor Interface (Programs for All Safety-Related Components)'

RESPONSE

As stated in Reference-(d) we plan to have the procedures in place bs July 1, 1985. We feel that this amount of time is needed for implementation on a system wide basis. As recommended, items relating to the reactor protection system will be given priority.

4.2 Reactor Trip System Reliability (Preventative Maintenance and Surveillance Program for Reactor Trip Breakers) 1~. A planned program of periodic maintenance, including lubrication housekeeping, and other items recommended by the equipement supplier.

RESPONSE

Reference (b) contained the answer to this item. For further clarification I am attaching a copy of BHP 4200-15 Rev. 3.

-2. Trending of parameters affecting operation and measured during testing to forecast degradation of-operability.

RESPONSE

Breaker response times will be trended to discover degradation of operability before a serious problem can arise.

3. Life testing of the breakers (including the trip attachments) on an acceptable sample size.

4. Periodic replacement of breakers or components consistent with demonstrated life cycles.

RESPONSE

To update our response contained in reference (d) the Westinghouse Owner's Group final report is scheduled for release at-the end of December 1984. After reviewing the final report, Ceco. will factor the results of the program into the maintenance, replacement and qualification programs.

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'4.3 Reactor Trip System Reliability (Automatic Actuation of Shunt'

~ Trip Attachment for-_ Westinghouse and B&W Plants)'

' RESPONSE

-Reference (d) contained our commitment to implement the modification by the first refueling outage. In addition, the responses'to the thirteen questions concerning the shunt trip modification will.be submitted by 2-15-85.

9284N 1

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BHP 4200-015 Revisien 3 1

PREVENTATIVE MAINTENANCE INSPECTION - .

REACTOR TRIP BREAKERS 1

A. STATEMENT OF APPLICABILITY l l

The purpose of this procedure is to describe the method used for perform.ing a periodic maintenance inspection of the Reactor Trip Breakers Type DS-416.

B. REFERENCES .

1. I.B. 33-790-1F-Instruction for Low Voltage Power Circuit Breaker Types DS and DSL C. PREREQUISITES

1. Breaker should be racked out and Compartment should be out of service.

D. 2. Equipment Needed:

. a. Certified Digital Voltmeter

b. 48VDC Power Supply

c. Certified Timer. Multi Amp SST-2 or Equivalent

- PRECALITIONS ih

1. Verify that. the breaker is open and in the disconnect position.

2. After removing breaker from cubicle, verify that the breaker is discharged before starting work.

E. MAIN B00Y .

Record all Data on Checklist BHP 4200-T13.

1. Remove breaker from cubicle.

• WARNING *

• AFTER REMOVING BREAKER FROM CUBICLE, VERIFY THAT *

• THE BREAKER IS DISCHARGED BEFORE STARTING WORK. *

2. Visually inspect breaker and cubicle for broken, missing or deformed parts.

3. Check for presence and tightness of fasteners.

A P P ,R O V Et D MAR S11984

) (2845P) B. O.S. R.

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BHP 4200-015 Revision 3 APPROVED -

MAR 311984 ,"

• WARNING

• B. O. S. R. * *

• USE CAUTION TO REMAIN CLEAR OF ENERGIZED BUS *

• • • • • • • • • *********w

4. If both M/G set output breakers are Out of Service, clean breaker cubicle and record completion on checklist BHP 4200-T13. -

5. Visually inspect breaker cubicle.

a. ' Check for any loose connection.

b. Check the appropriate fuse block for breakage or looseness.

Fuse blocks are located in the front upper compartments of the switchgear. Record any discrepancies and corrective action taken on checklist BHP 4200-T13.  :

6. Remove and inspect Arc Chutes and Insulating Barriers. Record any discrepancies and corrective action taken on checklist BHP 4200-T13.

7. Clean breaker and record completion on checklist BHP 4200-T13.

a. Use approved cleaner if necessary such as Stoddards. Solvent S.I.

1. 499554, lint free rags and dry compressed air. .

& b. Verify breaker is free.from corrosion.

8. Clean and inspect spring charging motor. Record any discrepancies and corrective action taken on checklist BHP 4200-T13.

9. Check auxiliary switch contacts and linkage condition. Record any discrepancies and corrective action taken on checklist BHP 4200-T13.

10. Lubricate breaker every 500 operations per Westinghouse 1.B.33-790-1F pg. 81. Record completion on checklist BHP 4200-T13 Lubricant S.I. # 507322.

11. Inspect insulating surfaces for any condition that could cause a loss of insulating properties.

12. Check contact condition alignment and settings. Reference Westinghouse I.B. 33-790-1F pg. 75. Record any discrepancies and corrective action taken on checklist BHP 4200-T13.

13. Check the breaker operating mechanism for excessive wear, freedom of movement, and any component discrepancy.

14. Verify breaker reassembly complete.

15. Bench test breaker. Initial each step on checklist.

- a. Provide 48VOC to breaker undervoltage trip device- terminals i 16(-) 15(+).

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BHP 4200-015 l

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b. Close'and open breaker manually.

,' c. Close and open breaker electrically,

d. Measure and record the opening response time of the breaker using the' test box control switch to open the breaker. (Shunt Trip).

.075 second maximum. ___

1) With the breaker hooked up to the test box for closing and ~

opening electrically, set up the timer as follows:

i. i Tvolcal SST-2 Multi-Amo timer setuo. , l

- Yellow timer terminals jumpered to terminals 5 & 6 on the breaker. No polarity.

- Red timer terminals jumpered across any set of phass-contacts. No polarity.

- Start latch on.

i i , _Stop latch o~ff.

f.

. - Start selector switch to "DC Applied".

) - Stcp selector switch to "N.C. Contacts".

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, e. Measure and record the opening response time of the breaker upon loss of 48 VDC to the LN coil. .075 second maximum.

i. 1) With the breaker hooked up to the test box for closing and opening, setup the timer as follows:

Tvolcal SST- Multi-Amo timer setuo.

- Ysilow timer terminals jumpered to terminals 15 and 16 on breaker. No polarity to timer.

- Red timer terminals jumpered across any set of phase contacts. No polarity.

- Start latch on.

- Stop latch off

- Start selector switch to "DC Removed". *

- Stop selector switch to "N.C. Contacts".

f. Close breaker and reduce 48 VDC to point at which breaker trips.

Record trip voltage. Verify trip between 14.4 VDC and 28.8 VDC g.

(g.e'l Disconnect instrumentation and test connections. A P P R O V E'D

h Record all data on checklist SHP 4200-T13.

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SHP 4200-015 R;visicn 3

16. Megger breaker and record findings on BHP 4200-T13. .

- a~ 17. If a discrepancy is found that cannot be corrected with available spare parts or by an adjustment, document on checklist BHP 4200-T13 and initiate a D.R. if required per Q.P.15-53. ,

18. Replace breaker in proper cubicle.

19. Notify Shift Engineer that this inspection was completed and the applicable operating surveilance may be performed. Have Shift.

Engineer sign and date on checklist SHP 4200-T13.

F. CHECXOFF t.ISTS

1. BHP 4200-T13 Reactor Trip Breaker Inspection Checklist.

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APPROVED i MAR 311984

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(2845P) - . .

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BHP 4200-T13 Revision 3 l REACTOR TRIP BREAKER O INSPECTION CHECK LIST gg EPN # Procedure Used BHP 4200-015 Rev. B. O. S. R.

Compt. Inspected By Date Breaker S/N Operation Counter Reading -/

l MAIN BODY Step Initial Comments

4. Clean Cubicle

5. Inspect Cubicle

6. Arc Chutes

7. Clean Breaker __

8. Charging Motor

9. Auxiliary Switch

10. Lubricate Breaker

12. Contacts & Settings

( 13. Operating Mechanism

14. Breaker Reassemoled

15. Bench Test Breaker Voltmeter BYEM # QA # _

TIMER BYEM

• QA #

a. 48 VDC to UV Device

b. Manual Operation

c. Electrical Operation l

d. Shunt Trip Check Response Time - ,

e. UV Trip Check Response Time - _

f. UV Trip Check Trip Voltage __

g. Disconnect Instruments And Test Connections

16. Insulation Resistance at 500 Volts Test Set BYEM# QA # .

Breaker Closed (A)(B)(C) Frame (A)(B) (A)(C) (B)(C)

Breaker Open Line to Load (A)(A) (B)(B) (C)(C) *

(- 19. Shift Engineer notified to perform reactor trip breaker surveillance.

S.E. /

R: viewed by Foreman: Reviewed by Master Electrician:

/ .__

/ _

I -

2

- 4. Schedule for any planned changes to existing data and information capability.

RESPONSE

The communication link between the Process and Prime Computers is to be replaced with a high speed communication link. .This will allow more frequent data

, samples and a more reliable data link. Installation is scheduled for the third quarter of 1985.

4

r; 2.1 Equipment Classification and Vendor Interface (Reactor Trip-System Components) 2.2 Equipment Classification and Vendor Interface (Programs for All Safety-Related Components)

RESPONSE

As stated in Reference (d) we plan to have the procedures in place by July 1, 1985. We feel that this amount of time is needed for implementation on a system wide basis. As recommended,~ items relating to the reactor protection system will be given priority.

4.2 Reactor Trip System Reliability (Preventative Maintenance and Surveillance Program for Reactor Trip Breakers)

1. A planned program of periodic ~ maintenance, including lubrication housekeeping, and other items recommended by the equipement supplier.

RESPONSE

Reference (b) contained the answer to this item. For further clarification I am attaching a copy of BHP 4200-15 Rev. 3.

2. Trending of parameters affecting operation and measured ,

during testing to forecast degradation of operability.

RESPONSE

L Breaker. response times will be trended to discover

+

degradation of operability before a serious problem can arise.

3. Life testing of the breakers (including the trip attachments) on an acceptable sample size.

i

4. Periodic replacement of breakers or components consistent with demonstrated life cycles.

RESPONSE

To update our response contained in reference (d) the Westinghouse Owner's Group final report is scheduled .for release at the end of December 1984. After reviewing the final report, CECO. will_ factor.the results of the program into the maintenance, replacement and qualification programs.

L .

4.3 Reactor Trip System Reliability (Automatic Actuation of Shunt Trip Attachment for Westinghouse and B&W Plants)

RESPONSE

Reference (d) contained our commitment to implement the modification by the first refueling outage. In addition, the responses to the thirteen questions concerning the shunt trip modification will be submitted by 2-15-85.

9284N I

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C'AP 4200-015 R; vision 3 r

PREVENTATIVE MAINTENANCE INSPECTION -

' I REACTOR TRIP 8REAKERS A. STATEMENT OF APPLICA8ILITY The purpose of this procedure is to describe the method used for

~

perform.ing a periodic maintenance inspection of the Reactor Trip Breakers Type DS-416.

8. ' REFERENCES -

1. I.8. 33-790-1F-Instruction for Low Voltage Power Circuit Breaker Types DS and DSL C. PREREQUISITES

1. Breaker should be racked out and Compartment should be out of service.

D. 2. Equipment Needed:

. a. Certified Digital Voltmeter

b. 48VDC Power Supply

c. Certified Timer. Multi Amp SST-2 or Equivalent h PRECAUTIONS

1. Verify that the breaker is open and in the disconnect position.

, 2. After removing breaker from cubicle, verify that the breaker is .

discharged before starting work.

E. MAIN 800Y .

Record all Data on Checklist SHP 4200-T13.

1. Remove breaker from cubicle.

• WARNING *

< n n

• AFTER REMDVING BREAKER FROM CU8ICLE, VERIFY THAT *

• THE BREAKER IS DISCHARGED BEFORE STARTING WORK.

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2. Visually inspect breaker and cubicle for broken, missing or deformed parts.

3. Check for presence and tightness of fasteners.

A P P ,R O V E D

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BHP 4200-015 I Revisicn 3 APPROVED -

g MAR 311984 ,

• WARNING

• O. O. S. R. * ,*

• USE CAUTION TO RENAIN CLEAR OF ENERGIZED BUS e

• l

4. If both M/G set output breakers are out of Service, clean breaker cubicle and record completion on checklist BHP 4200-T13. -

5. Visually inspect breaker cubicle.

a. ' Check for any loose connection.

b. Check the appropriate fuse block for breakage or looseness.

Fuse blocks are located in the front upper compartments of the switchgear. Record any discrepancies and corrective action taken on checklist BHP 4200-T13.  :

6. Remove and inspect Arc Chutes and Insulating Barriers. Record any discrepancies and corrective action taken on checklist BHP 4200-T13.

7. Clean breaker and record completion on checklist BHP 4200-T13.

a. Use approved cleaner if necessary such as Stoddards Solvent S.I.

1. 499554, lint free rags and dry compressed air. .

. \;) -- '

Verify breaker is free from corrosion. ..

b.

8. Clean and inspect spring charging motor. Record any discrepancies and corrective action taken on checklist BHP 4200-T13. ,

9. Check auxiliary switch contacts and linkage condition. Record any discrepancies and corrective action taken on checklist BHP 4200-T13.

10. Lubricate breaker every 500 operations per Westinghouse 1.B.33-790-1F pg. 81. Record comoletion on checklist BHP 4200-T13 Lubricant S.I. # 507322.

11. Inspect insulating surfaces for any condition that could cause a loss of insulating- properties.

12. Check contact condition alignment and settings. Reference Westinghouse I.B. 33-790-1F pg. 75. Record any discrepancies and corrective action taken on checklist BHP 4200-T13.

13. Check the breaker operating mechanism for excessive wear, freedom of movement, and any component discrepancy.

14. Verify breaker reassembly complete.

15. Bench test breaker. Initial each step on checklist.

< a,- Provide 48VDC to breaker undervoltage trip device terminals 16(-) 15(+).

(2845P) ,

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, b. Close and open breaker manually.

.\ 3

c. Close and open breaker electrically.

d. Measure and record the opening response time of the breaker using the' test box control switch to open the breaker. (Shunt Trip).

.075 second maximum. __

1) With the breaker hooked up to the test box for closing and ~

opening electrically, set up the timer as follows:

Tvcical SST-2 Multi-Amo timer setuo. ,

- Yellow timer terminals jumpered to terminals 5 & 6 on the j breaker. No polarity.

~

- Red timer terminals jumpered across any set of phase contact.. No polarity.

~

- Start latch on.

._Stop latch off.

- Start selector switch to "0C Applied".

- Stop selector switch to "N.C. Contacts".

h , e. Measure and record the opening response time of the breaker upon

. loss of 48 VOC to the UV coil. .075 second maximum.

t

1) With the breaker hooked up to the test box for closing and *

• opening, setup the timer as follows:

, Tvolcal SST- Multi-Amo timer setuo.

- Yellow timer terminals jumpered to terminals 15 and 16 on breaker. No polarity to timer.

- Red timer terminals jumpered across any set of phase

' contacts. No polarity.

4

- Start latch on.

- Stop latch off

- Start selector switch to "0C Removed".

- Stop selector switch to "N.C. Contacts"

f. Close breaker and reduce 48 VOC to point at which breaker trips.

Record trip voltage. Verify trip between 14.4 VOC and 28.8 VOC.

g.

.]

.. Disconnect instrumentation and test connections. A P P R O V E' D

h. Record all data on checklist BHP 4200.-T13. '

MAR 311984 (284SP) 3. O. S. R.

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BHP 4200-015 R;visicn 3

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16. Megger breaker and reconi findings on BHP 4200-T13. .

]. . 17. If a discrepancy is found that cannot be corrected with available spare parts or by an adjustment, document on checklist BHP 4200-T13 and initiate a D.R. if required per Q.P.15-53.

18. Replace breaker in proper cubicle.

19. Notify Shift Engineer that this inspection was completed and the applicable operating surveilance may be performed. Have Shift.

Engineer sign and date on checklist BHP 4200-T13.

F* . CHECK 0FF LISTS

1. SHP 4200-T13 Reactor Trip Breaker Inspection Checklist.

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APPR0VED

')

! MAR 311984 l

• B. O. S. R.

(2345p) ra. , ,

m BHP 4200-T13 R: vision 3 l REACTOR TRIP BREAKER D

INSPECTION CHECK LIST g EPN # Procedure Used BHP 4200-015 Rev. B. O. S. R.

Compt. Inspected By Date Breaker S/N Operation Counter Reading '/

MAIN BODY Step Initial Comments

4. Clean Cubicle

5. Inspect Cubicle

6. Arc Chutes

7. Clean Breaker _,

8. Charging Motor

9. Auxiliary Switch

10. Lubricate Breaker

12. Contacts & Settings

13. Operating Mechanism

14. Breaker Reassembled

15. Bench Test Breaker Voltmeter BYEM # QA # _

== TIMER BYEM a QA # .

a. 48 VDC to UV Device

b. Manual Operation

c. Electrical Operation l

d. Shunt Trip Check Response Time -

e. UV Trip Check Response Time -

l f. UV Trip Check Trip Voltage -

g. Disconnect Instruments And Test Connections

16. Insulation Resistance at 500 Volts Test Set BYEM# QA #

• Breaker Closed (A)(B)(C) Frame (A)(B) (A)(C) (B)(C)

Breaker Open Line to Load (A)(A) (B)(B) (C)(C)

• l\ - 19. Shift Engineer notified to perform reactor trip breaker surveillance.

f S.E. /

R: viewed by Foreman: Reviewed by Master Electrician:

/ _.

/ _