ST-HL-AE-3393, Forwards Suppl 3 to Qualified Display Processing Sys (Qdps) Verification & Validation Process Final Rept & Summary of Qualified Display Processing Sys (Qdps) Recurring Component Failure Data
| ML20012C281 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 03/12/1990 |
| From: | Mcburnett M HOUSTON LIGHTING & POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20012C282 | List: |
| References | |
| ST-HL-AE-3393, NUDOCS 9003200440 | |
| Download: ML20012C281 (4) | |
Text
4 The Light co mpany South Tezu Project Electric Generating Station P.O.Bos289 Wadsworth. Tesas 77483 Houston Lighting & Power March 12, 1990 ST-HL-AE-3393 File No.:
G4.2, J41.1 G9.17 10CTR50 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 50-499 submittal of supplement 3 to the QDPs Verification and Validation Process Final Report and Update on the system Performance Reference A.
Safety Evaluation Report Related to the Operation of South Texas Project Units 1 and 2, NUREG-0781, Supplement No. 3; dated May 1987.
B.
Submittal of Supplement 1 to the QDPS Verification and Validation Program Final Report; M. R. Wisenburg, HL&P, Letter to the NRC; ST-HL-AE-1988; dated Harch 19, 1987.
C.
Response to NRC Concerns Identified During an Onsite Assessment of the Qualified Display Processing System; M. A. McBurnett, HL&P, Letter to the NRC; ST-HL-AE-2859; dated November 22, 1988.
D.
Submittal of Supplement 2 to the QDPS Verification and Validation Program Final Report; M. A. McDurnett, HL&P, Letter to the NRC; ST-HL-AE-2916; dated January 30, 1989.
E.
Licensee Event Report 88-014 Revision 01 Regarding Reactor Protection System Actuation Due to a Software Problem in the Qualified Display Processing System; G. E. Vaughn, HL&P, Letter to the NRC; ST-HL-AE-2601; dated April 7, 1988.
This letter completes HL&P's commitment to keep the NRC informed of QDPS operational performance during the first operating cycle.
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,Ob THC/QDPS0390.LTR A Subsidiary of Ilouston Industries incorporated 9003200440 900312 CT PDR-ADOCK 05000498 P-PDC
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Houston Lighting & Power Company South Texas Project Dectric Generating Station
$1 ML M 3393 Pope 2 of 4 The Qualified Display Processing System (QDPS) is a microprocessor based i
system which performs several safety related functions at the South Texas
)
I Project. A comprehensive Verification and Validation (V&V) program was implemented to ensure that the system would perform in accordance with its functional requirements. Review of the QDPS design and V&V program involved a number of audits, site visite, and meetings with the NRC staff.
As stated in Reference A, the NRC staff requested to be kept informed of 1
problems encountered and any changes made to the QDPS during the first j
operating cycle. This was to provide the staff a basis for evaluating the reliability of the system.
HL&P committed to keep the Staff informed in References B and C.
Reference D described the changes incorporated into the Unit 2 QDPS prior to Fuel Load and the V&V results for those software changes.
1 The same changes have now been incorporated into the Unit 1 QDPS.
Reference E reported an event concerning behavior of the Temperature Averaging Scheme (TAS) portion of QDPS during a plant cool down.
This was the j
only significant anomaly observed in operation of the QDPS.
The TAS algorithm i
has been revised to eliminate the problem, and the revised firmware has been installed in Unit 1.
These same changes will be implemented in Unit 2 during its first refueling outage.
Supplement 3 to the QDPS V&V Final Report is provided in Attachment I.
It describen the TAS algorithm change and several other minor software modifications included in the same change package. The on line parameter update (oLPU) capability described in Attachment I had not been delivered when the Unit 1 first refueling outage occurred and is presently planned for j
installation during the second refueling outage.
The entire package is j
l planned for installation in Unit 2 during the first refueling outage.
QDPS component failure data for STP Unit 1 from fuel load (August 1987) through August 1988 was provided in Reference C.
Five cases were identified where a component demonstrated more than one failure during that period.
Attachment II provides data, in the same format as previously used, covering the period from August 1988 through February 1990 for Unit 1 and the period from fuel load (December 16, 1988) through February 1990 for Unit 2.
As in the earlier report, only component types with more than one failure are generally reported; however, those component types previously listed are j
included, listing the actual number of failures.
There have been no failures to date which resulted in a system outage.
The QDPS has demonstrated 100% operational availability in both Units in that the system has been available in accordance with the Technical Specifications on a continuous basis to support plant operations since fuel load.
i T HC/CDPS0370.LTR
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o Houston Lighting & Power Company South Texas Project Electric Gents. ting Station i
l' ST ML AE 3393 Pepe 3 of 4 If you have any questions on this matter, please contact Mr. A. W. Harrison at (512) 972-7298 or myself at (512) 972-8530.
. A. McBurn & /
D ett Manager, Licensing I
SDP/the Attachments:
1.
Supplement 3 to the Qualified Display Processing System Verification and Validation Process Final Report for the South Texas Project i
II.
Summary of QDPS Recurring Component Failure Data THC/QDPS0390.LTR
EL ST.HL+AE.3393 i
Houston Ligh@g k Power Company File No.: 04.2 i
. South Texas hy,ect Electric Generating Station p g.
4 p
cc:
. Regional Administrator, Region IV Rufus S. Scott 4
Nuclear Regulatory Coinmission Associate General Counsel 611 Ryan Plaza Drive, Suite 1000 Houston Lighting & Power Company Arlington, TX 76011 P. O. Box 61867 c-Houston, TX 77208 George Dick, Project Manager U.S. Nuclear Regulatory Commission INPO I
Washington, DC 20$$$
Records Center 1100 Circle 75 Parkway 5
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-l 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 i
D. K. Lacker b
J. R. Newman, Esquire Bureau of Radiation Control Newman & Holtzinger, P.C.
Texas Department of Health l
l 1615 L Street, N.W.-
1100 West 49th Street Washington, DC 20036 Austin, TX 78704 D. E. Ward /R. P. Verret Central Power & Light Company P. O. Box _2121 i.
. Corpus Christi, TX 78403 Jr C. Lanier t
Director of Generation City of Austin Electric Utility-l 721 Barton Springs Road Austin, TX 78704 t
R. J. Costello/M. T. Hardt City Public Service Board P. O. Box 1771 San Antonio, TX 78296 r
l Revised 12/15/89 t
.L4/NRC/
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