ML20011E906
| ML20011E906 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 02/16/1990 |
| From: | Rosen S HOUSTON LIGHTING & POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-003, IEB-89-3, NUDOCS 9002230016 | |
| Download: ML20011E906 (5) | |
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The Light P.O. Box 1700 llouston, Texas 77001 (713) 228 9211 llouston Lighting se Power - -
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February 16, 1990 ST.HL AE-3350 File No.: G3.3 10CFR50.54(f) f U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 South Texas Project Electric Generatitig Station Units 1 and 2 r
Docket Nos. STN 50-498, STN 50 499 Response to NRC IE Bulletin 89 003,
" Potential Loss of Required Shutdown Margin u
Durine Refuelinc Onerations" NRC IE Bulletin 89 003, received November 28, 1989, has been reviewed by-llouston Lighting & Power Company (HL&P) to address potential loss of required shutdown margin during refueling operations at the South Texas Project Electric Generating Station (STPEGS). HL&P has concluded that sufficient precautions will be in place to ensure against loss of required shutdown margin during movement and placement of highly reactive fuel during refueling operations. This conclusion is supported by the attached responses to the actions requested by the Bulletin.
If there are any questions, please contact Mr. P. L. Walker at (512) 972-8392 or myself at (512) 972 7138.
S. L. Rosen Vice President Nuclear Engineering and Construction SIR /PLU/n1
- Attachments: Responses to IE Bulletin 89 003 Requested Actions k
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4 9002230016 900216 PDR ADOCK 05000498
_ o PDC A Subsidiary of Ilouston Industries incorporated
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v ST.HL AE.3350 Houston Lighting & Power Company File No.: C3 3 e
South Texas, Project Electric Generating Station p888 2 cc:
Regional Administrator, Region IV Rufus S. Scott Nuclear Regulatory Commission Associate General Counsel 611-Ryan Plaza Drive, Suite 1000 Houston Lighting & Power Company Arlington, TX 76011 P. O. Box 61867 Houston, TX 77208 Coorge Dick, Project Manager U.S. Nuclear Regulatory Commission INPO Washington, DC 20555 Records Center 1100 circle 75 Parkway J. I. Tapia Atlanta, CA 30339 3064 Senior Resident Inspector c/o U. S. Nuclear Regulatory Dr. Joseph M. Hendrie Commission 50 Be11 port Lane P. O. Box 910 Be11 port, NY 11713
. Bay City, TX 77414 D. K. Lacker J. R. Newman, Esquire Bureau of Radiation Control Newman & Holtzinger, P.C.
Texas Department of llealth 1615 L Street, N.W.
1100 West 49th Street Washington, DC 20036 Austin, TX 78704
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D. E. Ward /R. P. Verret Central Power & Light Company P. O. Box 2121 Corpus Christi, TX 78403
' J. C. Lanier Director of Generation City of Austin Electric Utility 721 Barton Springs Road Austin, TX 78704 R. J. Costello/M. T. Hardt City Public Service Board i
P. O. Box 1771 San Antonio, TX 78296 l
i Revised 12/15/89 l
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UNITED STATES OF AMERICA r
NUCLEAR REGULATORY COMMISSION i
In the Matter
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l Houston Lighting & Power
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Docket Nos. 50-498 Company, et al.,
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50-499 I
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South Texas Project
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Units 1 and 2 f
AFFIDAVIT S. L. Rosen being duly sworn, hereby deposes and says that he is Vice President, Nuclear Engineering and Construction, of Houston Lighting & Power company; that he is duly authorized to sign and file with the Nuclear Regulatory l
Commission the attached response to NRC Bulletin 89-003; is familiar with the j
L content thereof; and that the matters set forth therein are true ar.d correct to
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the best of his knowledge and belief.
.J
%ds S. L. Rosei
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Vice President, Nuclear Engineering and Construction Subscribed and sworn to before me, a Notary Public in and for The State of Texas this /g// day of [Er34fgg 1990.
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State of Texas A1/036 Nil
n ATTACHKENT Page 1 of 2 Responses to IE Bulletin 89-003 Requested Actions
- 1) Aesure that any intermediate fuel assembly configuration (including control rods) intendcd to be used during refueling is identi?ied and evaluated to maintain sufficient refueling boron concentration to result in a minimum shutdown margin of approximately 5t.
Peeponse Guidelines have been provided by Westinghouse that cre to be followed when placing fuel assemblies in intermediate locations.
Implementation of these
, controls over fuel assembly configuration will ensure that a minimum shutdown margin of approximately 54 is maintained.
- 2) Assure that fuel loading procedures only allow those intermediate fuel assembly configurations that do not violate the allowable shutdown margin and that these procedores are strictly adhered to.
Respengg A fuel assembly is preferentially placed in its location in the final fuel loading configuration except when temporarily stored along the baffle or when used to conctruct temporaiy " boxes".
When temporarily stored along the baffle, an assembly must be separated from the nearest single assembly by a minimum of one asuembly width, and from the nearest cluster of assemblies by a minimum of two assembly widths. This toquirement is provided in procadure OPOP08-FH-0009, " Core Rei'ueling".
Cuidelines for boxing have been provided by Woetinghouse which will not allow intermediate fuel assembly configurations to violate the allowable shutdown margin.
Procedure OPOP08-FH-0009, " Core Refueling", will incorporate these guidelines in instructions for forming temporary boxes which preclude configurations that are more reactive than those analyzwd.
i These instructionr will limit the boxing methods tot
- 1) using the assembly loading guide; 2) using configurations in which al) the assemblies are in j
their final core locations; and 3) using dummy assemblies to form the box.
j A licensed Ser.ior Reactor Operator designated as Core Loading Supervisor is responsible for approving any intermediate configurations utilizing these guidelines.
STPEGS-specific guidelines that provide greater flexibility may be provided by Westinghouse at a later date. Further revisions to the procedure will provide clear direction on permiesible assembly configurations.
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ATTACHMZNT Page 2 of 2
- 3) Assure that the staff responsible for refueling operations is trained in the procedures recommended in Item 2 above and understand the potential consaquences of violating these procedvres. This training should include the fundamental aspects of criticality control with higher enriched fuel L
assemblies.
Response
Prior to fuel movement for the next refueling at STPEGS a shif t briefing will be provided to the staff responsible for refueling operations on the procedural requirements of OPOP08-FH-0009. This briefing will address revisions and limits and precautions stated in OPOP08-FH-0009.
OPOP08-FH-0009 will include in the precautions the potential consequences relative to shutdown margin of violating the procedural requirements.
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Training on the procedure will subsequently be included in operator requalificction training.
A1/036,N11
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