ML20196E457

Responds to NRC Bulletin 88-010, Nonconforming Molded - Case Circuit Breakers. Due to Magnitude & Complexity of Task,Not Clear That Util Can Complete All Actions Required Prior to Fuel Load.Results of Evaluation Expected by 890401

ML20196E457
Person / Time
Site:	South Texas
Issue date:	12/02/1988
From:	Vaughn G HOUSTON LIGHTING & POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
IEB-88-010, IEB-88-10, ST-HL-AE-2888, NUDOCS 8812090345
Download: ML20196E457 (5)

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December 2, 1988 ST-HL-AE-2888 File No.: G3.3 10CFR50 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 South Texas Project Electric Generating Station Docket No.50-499 NRC Bulletin No. 88-10: "Nonconforming Holded - Case Circuit Breakers" HL&P Proposal to Extend Completion Time for South Texas Project Electric Generating Station, Unit 2 HL&P received NRC Bulletin 88-10 on November 23, 1988. The South Texas Project Electric Generating Station (STPEGS) is aggressively pursuing the actions required by the Bulletin. However, due to the magnitude and complexity of the task, it is not clear that HL&P can complete all actions required prior to fuel load in Unit 2.

We believe that the prerequisite test required for our installed Class lE molded case circuit breakers provides substantial confidence in their safety and reliability. Our prerequisite tests are conducted as part of our startup test program and are described in Attachment A.

There are currently two sources of stored Class IE molded case circuit breakers at STPEGS, those procured as operations spares by HL&P and those remaining from the construction phase in Bechtel warehouse control. l HL&P has identified 118 Class 1E and commercial grade dedicated molded case circuit breakers in stock. Of the 118, our reviews of the procurement records have found 9 breakers for which we have on site evidence of traceability to the circuit breaker manufacturer (CBM), 57 for which we have obtained documentation from the equipment supplier that indicates that he has verifiable traceability to the CBM, and 52 for which we are still in the  ;

process of contacting the equipment vendors.

Bechtel to date has identified 854 Class IE molded case circuit breakers remaining in the warehouse from the construction phase. Of the 854, our reviews of site records on the first 189 have identified that all 189 are traceable to only the original electrical equipment manufacturer (CEH) not the CBM, Contacts are being made with the OEMs to obtain evidence of CRM traceability.

diary of Ilouston Industrin incorporated \g 8812070345 881202 PDR ADCCK 050004M

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Ifouston Ughting & Power Company ST HL AE-2888 File No.: G3.3 Page 2 Although the warehouse inventory verifications and site documentation reviews will be complete prior to fuel load, the traceability verification will be dependent on equipment supplier cooperation for a very high percentage of the breakers. We cannot judge at this time how long it will take to obtain the required information from the many vendors involved.

Based on these considerations. HL&P plans to submit the results of our evaluation for STPEGS Units 1 & 2 by April 1, 1989.

If you have any questions, please contact J. N. Bailey at (512) 972 8663 or T. J. Jordan at (512) 972-7902.

l cuf G. E. Vaughn Vice President, Nuclear Operations  !

JHG/TJJ:mg Attachment A

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Ilouston Lighting & Power Company ST HL-AE-2888 File No.: G3.3 Page 3 CC:

Regional Administrator, Region IV Rufus S. Scott Nuclear Regulatory Comission Associate General Counsel 611 Ryan Plaza Drive, Suite 1000 Houston Lighting & Power Company Arlington, TX 76011 P.O. Box 1700 Houston, TX 77001 George Dick, Project Manager U. S. Nuclear Regulatory Comission INPO Washington, DC 20555 Records Center 1100 Circle 75 Parkway Jack E. Bess Atlanta, GA 30339 3064 Senior Resident Inspector / Operations c/o V. S. Nuclearpgulatory Comission Dr. Joseph M. Hendrie P. O. Box 910 50 Bellport Lane Bay City, TX 77414 Bellport, NY 11713 J. I. Tapia Senior Resident Inspector / Construction c/o U. S. Nuclear Regulatory Comission P. O. Box 910 Bay City, TX 77414 J. R. Newman, Esquire Newman & Holtzinger, P.C.

1615 L Street, N. W.

Washington, DC 20036 R. L. Range /R. P. Verret Central Power & Light Company P. O. Box 2121 Corpus Christi, TX 78403 R. John Miner Chief Operating Officer City of Austin Electric Utility 721 Barton Springs Road Austin, TX 78704 R. J. Costello/M. T. Hardt City Public Service Board P. O. Box 1771 San Antonio, TX 78296 Revised 08/24/88

G Ilouston Ughting & Power Company UNITED STATES OF AMERICA NUCLEAR REGULATORY COP 911SSION In the Matter

. Houston Lighting & Power Docket No. 50-499 Company, et al.,

South Texas Project Un:t 2 AFFIDAVIT G. E. Vaughn being duly sworn, hereby deposes and says that is is Vice President, Nuclear Plant Operations of Houston Lighting & Power Company; that he is duly authorized to sign and file with the Nuclear Regulatory Commission the attached response to NRC Bulletin 88-10; is familiar with the content thereof; and that the matters set forth therein are true and correct to the best of his knowledge and belief.

G. E. Vaughn '

Vice President, Nuclear Plant Operations Subscribed and sworn to before me, a Notary Public in and for The State of Texas this Andday of December, 1988.

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,- Attachment ST HL-AE-2888

. File No.: G3.3 Page 1 ATTACHMENT A Circuit Breakers (CBs) used in Class IF aplications at South Texas Project Electric Generating Station (STPEGS) are required to be tested in accordance with General Prerequisite Test Procedure SG E-01, Plant

l. Maintenance Procedure OPMP05-NA-0004, or Plant Station Procedure The requirements of these procedures are as follows:

IPSP06-NZ 0006.

I SG-E-01

1. Inspect for cleanliness and any physical defects. Ensure load and line side connections are tight.

2. Functionally test mechanical interlocks for proper operation.

3. Open and close breaker 3 times.

4. Verify with OHM meter that contacts are open and closed when indicated as such by switch handle position.

l 5. Insulation Resistance Test.

1

6. Test thermal trip function by applying a current 300% of the breaker rating. Measure trip time for each phase.

1 i 7. For magnetic breakers, test each pole by applying an increasing current until breaker trips.

OPMP05-NA 0004, IPSP06-NZ-0006

1. Inspect breaker for physical damage or evidence of overheating.

2. Open and close breaker a minimum of 3 times to check mechanical 4

operation.

j 3. Continuity check on each pole with breaker closed.

J 4. Insulation Resistance Test.

5. Test the molded case breakers by primary injection.

. A. Instantaneous Trip Test. Apply increasing current until breaker j trips.

B. Overcurrent Trip Test on therm 41 breakers at 300% of breaker rating. Measure trip time for each phase.

CBs tested to the requirements of these procedures have been shown to be functional and operable. CBs which have been tested to the above requirements are considered reliable and give reasonable assurance that

, the performance of these CBs will be acceptable until completion of the j requirements of NRC Bulletin 88-10.

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