ML20073P681
| ML20073P681 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 05/15/1991 |
| From: | Kinsey W HOUSTON LIGHTING & POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-89-13, NUDOCS 9105220219 | |
| Download: ML20073P681 (6) | |
Text
,
The Light c o m p a n y """'I'3''[?"N')E""I'2'"""!!"!."' 'i"" 333'"' * $"d'""h'_.I** II/_O 1fouston I.ighiing & Power f
May 15, 1991 ST ilL AE 3761 Flie No.: G03,08 10CFR50.54(f)
U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 South Texas Project Electric Generating Station Units 1 and 2 Docket Nos. STN 50 498 STN $0 499 Supplemental Response to NRC Generic Letter 89-13,
" Service Water System Problems Affectine Safetv Related Eauipment"
References:
1)
G. E. Vaughn, tilAP, to NRC Document Control Desk, January 29, 1990 (ST llL AE 3341) 2)
W.11. Kinsey, IllAP, to NRC Document Control Desk, March 27,1991 (ST HL AE 3720) 3)
W.11. Kinsey, IllAP, to NRC Document Control Desk, April 3, 1991 (ST ilL-AE 3701)
- 4) NRC Inspection Report (50-498/91 06; 50 499/91 06) dated March 4, 1991 As requested in NRC Generic Letter 89-13, liouston Lighting 6 Power Company (IllAP) submits the attached status of implementation of recommended actions at the South Texas Project Electric Generating Station (STPEGS). The STPEGS program for ensuring operability of the Essential Cooling Water System was previously described in reference (1).
That response was subsequently corrected in reference (2), and the impicmentation schedule was updated in reference (3).
References 2 and 3 were submitted in response to findings which resulted from an NRC inspection at STPECS (Ref. 4).
If you should have any questions on this matter, please contact either Mr. P. L. Walke r at (512) 972 8392 or me at (512) 972-7921.
Ih h.
W.
- 1. Kinsey
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Vice President, Nuclear Operations PLW/ amp Attachment
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91052 O E 910515
' Subsidiary of flouston industries incorporated
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PDR ADOCK 05000490 P
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ST HL AE 3761 llouston Lighting & Power Coinpany File No.: C03,08 South Tesai Project Electric Genctating Stat.wn Page 2 Cc:
Regional Administrator, Region IV Rufus S. Scott Nuc1 car Regulatory Cominission Associate General Counsel 611 Ryan Plaza Drive, Suite 1000 Houston Lighting 6 Power Company Arlington, TX 76011 P. O. Box 61867 Houston, TX 77208 George Dick, Project Manager U.S. Nuclear Regulatory Commission INPO Vashington, 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. Hendric Commission 50 Be11 port Lane P. O. Box 910 Bellport, NY 11713 Bay City, TX 77414 D. K. Lacker J. R. Newman, Esquire Bureau of Radiation Control Newman 6 Holtzinger, P.C.
Texas Department of Health 1615 L Street, N.W.
1100 Vest 49th Street Washington, DC 20036 Austin, TX 78756 3189 D. E. Ward /T. M. Puckett Central Power and Light Company P. O. Box 2121 Corpus Christi, TX 78403 J. C. Lanie r/M. B. Le e Cit-j of Austin Electric Utility Department P.O. Box 1088 Austin, TX 78767 R. J. Costello/M. T. Hardt City Public Service Board P. O. Box 1771 San Antonio, TX 78296 Revised 01/29/91 L4/NRC/
UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter
)
)
llouston Lighting 6 Power
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Docket Nos. 50-498 Company, et al.,
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50 499
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South Texas Project
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Unit 1 and 2
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AFFIDAVIT V.11. Kinsey being duly sworn, hereby deposes and says that he is Vice President, Nuclear Operations, of flouston Lighting 6 Power Conpany; that he is duly authorized to sign and file with the Nuclear Regulatory Commission the attached supplemental response to NRC Generic Letter 89-13; 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.
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Nucl}earOperations W. H. Kinsey Vice President, STATE OF TEXAS
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Subscribed and sworn to before me, a Notary Public in and for The State of Texas this /572/ day of /h/)y
, 1991.
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State of Texas 4
GLB)91-112.001
Attachment ST HL.AE 3761 Page 1 of 3 South Texas Project Electric Cenerating Station Supplemental Response to NRC Ceneric Letter 8913
" Service Water System Problema Af fecting Safety Related Eauipment" 1.
For open cycle service water systeus, implement and maintain an ongoing program of surveillance and control techniques to significantly reduce the incidence of flow blockage problems as a result of biofouling.
Response
During the recent STPECS Unit I refueling outage, all three Essential Cooling Water (ECW) pump bays were dewatered and inspected for macroscopic biofouling, sediment, and corrosion.
No indications of biological macrofouling were observed.
Plant procedures have been revised so that flow testing of ECW heat exchangers is required if they have been left idle for extended periods.
Cleaning and/or flushing may be performod should the flow test not be satisfactory.
II.
Conduct a test program to verify the heat transfer capability of all safety-related heat exchangers cooled by service water.-
Etsvonse Procedure OPEP07-EW 0001, " Performance Test for ECW Heat Exchangers",
has been revised.
This procedure, in conjunction with other procedures, meets the recommendations of Generic Letter 89 13 Enclosure 2.
The Unit 1 ECW heat exchangers were tested during the recent refueling outage.
They will be tested again during the next two refueling outages.
The final testing frequency will be determined by heat exchanger test tosults and data taken from a model ECW side stream heat exchanger.
The exception to the above is the IX3J heat exchangers for _the Component Cooling Water System.
As noted in reference (2), the heat exchangers could not be tested during the recent outage. Testing vill be performed during the next three refueling outages.
The test frequency can be modified accordingly after the third test.
Regardless, the interval between tests will be no greater than five years.
III,- Ensure by establishing a routine inspection and maintenance program 'for open cycle service water system piping and components that corrosion,'
erosion, protective coating failure, silting, and biofouling cannot degrade the performance of the safety-related systems supplied by-service water.
CLB\\91-112.001 1
/
1
Attachment ST.HL. AE 3761 Page 2 of 3 South Texas Project Electric Generating Station Supplemental Response to NRC Generic Letter 89 13
" Service Water System Probletts Af fecting Safety-Related Equiptrent"
Response
The STPEGS preventive maintenance program meets the requirements of this recommended action for the Essential Cooling Water System.
As noted in reference (4), the routine inspection and preventive maintenance programs were reviewed by the NRC and found satisfactory, with the exception discussed below.
Generic Letter 6913 is specifically referenced in procedure OPMP02 ZG 0008, *PM Development".
As noted in reference (4), biofouling controls were observed to be effective, with satisfactory inspections to detect biofouling being performed.
However, a weakness was noted in regard to absence of procedural guidance for conducting the biofouling inspection activity.
Inspection procedures for biofouling are currently under development.
The approved procedures will be followed in subsequent inspections.
IV.
Confirm that the service water system will perform its intended function in accordance with the licensing basis for the plant.
Response
As stated in HL&P's original response (Ref.1) as modified by Ref. 2, HL&P performed an inhouse safety system functional inspection (SSFI) to assess the operational readiness of the STPEGS ECW system.
A walkdown of the Unit 1 ECW system was performed during the SSFI to verify the details of equipment installation.
The SSFI concluded that the ECW system will be able to perform its safety function.
As stated in reference (1), to confirm effectiveness of configuration control on the Component Cooling Water (CCW) System, HL&P was to walkdown one train of the Unit 1 CCW against the appropriate design documents prior to startup after the third refueling of Unit 1.
Unikdowns of the other trains and the Unit 2 CCW system would be performed if any significant generic discrepancies were discovered.
All three trains were walked dovn to confirm effectiveness of configuration control, and nu significant generic deficiencies were observed.
V.
Confirm that maintenance practices, operating and emergency procedures, and trcining that involves the service water system are adequate to ensure that safety-related equipment cooled by the service water system will function as intended and that operators of this equipment will perform effectively.
GLB\\91-112.001
Attachment ST llL AE 3761 Page 3 of 3 South Texas Project Electric Generating Station Supplernental Response to NRC Generic Letter 8913,
" Service Vater Systern Probletts Affecting Safety Related Eauirtrent"
Response
Procedures for ECW and CCW operation and the maintenance procedures specific to ECW and CCW components have been reviewed.
Discrepancies found in operating procedures were of no significance to safety.
Maintenance practices involving service water systerns are adequate to ensure that safety related equipment cooled by the service water will function as intended.
GLB\\91-112.001
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