the light companyb' · project electric generating station (stpegs) technical specifications i...
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The Light-
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October 14, 1991ST hl AE 3888File No.: C2610CFR50.73
U. S. Nuclear Regulatory CommissionAttention: Doctunent Control DeskWashington, DC 20555
South Texas Project Electric Generating StationUnit 1
Docket No. STN 50 498Licensee Event Report 91 020 Regarding
a Technical Specification Violation Due toFailure to Perform Two Rod Position Surveillaner.g
Pursuant to 10CFR50.73, llouston Lighting 6 Powet company (IllAP) submitsthe attached Licensee Event Report (LER 91020) regarding a TechnicalSpecification violation due to failure to perform two rod positionsurveillances. This event did not have any adverse impact on the healt.h andsafety of the public.
If you should have any questions on this matter, please contactMr. C. A. Ayala at (512) 972 8628 or myself at (517) 972 7205.
!, ba wc ra m aWilliam J. JumpManager,Nuclear Lironsing
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Attachment: LER 91 020, (South Texas, Unit 1)
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It m e1275oot.ut A Subsidiary of Ilouston Industives hworpot.ited /91102SOO41 911014 / dPDR ADOCK 05000498S PDR
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ST llL. AE. 3 8 8 8Houston Lighting & Powcr Company File No. : 02 6. .-
South Tesai Project Electric Generating Station Page 2.-
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cc:
Regional Administrator, Region IV Rufus S. Scott,
Nuclear Regulatory Commission Associate General Counsel611 Ryan Plaza Drive, Suite 400 Houston Lighting & Power CompanyArlington, TX 76011 P. O. Box 61867
Houston, TX 77208 '
Ceorge Dick, Project Manager-U.S. Nucleat' Regulatory Commission INPOWashington,-DC 20555 Records Center
1100 circle 75 Parkway ;
J._I. Tapia Atlanta, CA 30339 3064 '
Senior Resident Inspectorc/o U. S. Nuclear Regulatory Dr. Joseph M. Hendrie
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Commission 50 Be11 port Lane,
P. O. Box 910 Be11 port, NY 11713 1Bay' City,.TX 77414 !
D. K. LackerJ. R.-Newman, Esquire Bureau of Radiation ControlNewman & Holtzinger, P.C. Texas Department of Ilealth1615 L Street, N.V. 1100 West 49th Street ;
Washington, DC 20036 Austin, TX 78756-3189*'
. D. E.: Ward /T. M. Puckett'
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*Central Power and Light CompanyP. O.-Box 2121Corpus Christi, TX 78403 |
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L J. C. Lanier/M. B.-Lee ;
City of Austin ,
| Electric' Utility DepartmentP.O. Box 1088 ii
-Austin. TX -78767. -
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K. J. Fiedler/M. T.. Hardt ;
City Public Service BoardP. O. Box 1771San Antonio, TX 78296
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Revised 10/11/91
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South Texas, Unit 1 o |6 | 010 | 0 | 4 |9 | 8 1 lor |0|5Technical Specification Violation Due tom6a **
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On September 14,1991, at 1439, Unit 1 was in Mode 1 at 100% power when the !
Rod Position Deviation Monitor was incorrectly declared operable by the Shift :Supervisor. The error was discovered on September 15, 1991, at 0415 when the" ROD DEVIATION" annunciator was received. During the time the monitor wasincorrectly considered operable, two increased frequency surveillances were ,
misred, resulting in a Technical Specification violation. The cause of theevent was that errors were made by three Shift Supervisors in implementing theprocedural requirements regarding the Operability Tracking Log system. Also,the Shift Supervisor who incorrectly declared the monitor operable did notconsult all references prior to making an operability determination. Anadditional cause was inadequate identification of the effect of the TemporaryHodification package which documented the monitor inoperability. A briefingvill be given to the licensed operators stressing the importance of-theOperability Tracking Log system as described in the Configuration ManagementProcedure. Also, a memo has been sent to all Senior Reactor Operatorsscressing the need to exhaust all available references prior to makingoperability determinations. The Temporary Modification request form has beenrevised to provide a clearer operability determination reminder.
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E1[RIPTION OF EVENT:
On September 14, 1991, at 1439. Unit I was in Mode 1 at 100% reactor power.
when the Shift Supervisor incorrectly declared the Rod Position Deviation |
Monitor operable for a seriod of approximately 14 hours. The South Texas 1
Project Electric Generating Station (STPEGS) Technical Specifications i
3/4.1.3.1, 3/4.1.3.2, and 3/4.1.3.6 require control rod position to be-monitored every 12 hours with the rod position deviation nonitor operable andthat they be inonitored every 4 hours when the rod position deviation stonitoris inoperable. As a result, during the approximately 14 hours the monitor wasincorrectly considered operable, two Technical Specification 4 hour positionsurveillances were missed. Upon discovery of the error, the rod position
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deviati n monitor was declared inoperable and the 4 hour-positionsurveillances were resumed, . )
The incorrect operability determination was. discovered on September 15, 1991, ;
at 0415 when the " ROD DEVIATION" annunciator was received. The LicensedOperators responded to the alarm and manually verified tha_t there was no rod
..!deviation _. . Initially the Operators were unable to determine whether the causeof the-alarm was from the Digital Rod Position Indication (DRPI) panel or the ,
PROTEUS computer; however, one of the Operators remembered that a relay '
required for rod position devit. tion acnitor operability had been removed. The !'
relay is associated with the PROTEUS computer point labeled, "RPI RODS HAVEMOVED PULSE" and was removed to prevent multiple spurious " ROD DEVIATION"alarms caused by erratic input from the DRPI system.
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The-relay was removed on April 3, 1991 without a work document 'and the rodposition deviation monitor was declared inoperable. The Operability TrackingLog'(OTL) listed the removed relay, but.did not document a work packageassociated with the removal of the relay. In May of 1991, a Vork Request (VR) +
vas initiated to troubleshoot and identify the cause of the " ROD DEVIATION" t
alarms and,. at the same time, control and document the removal of the relayvia the work request process. On July 12, 1991 STPEGS initiated a Station. Problem Report (SPR).and an investigation to address removing the relay priorto initiating an associated VR, On July 29, 1991 the DRPI system engineerinitiated a Temporary Modification Request, and on August- 29, 1991; the
_ relay's removal was formally documented by a Temporary Modification.- Becausethe relay's removal had multiple effects, the Temporary Modification Type waslisted as, "0THER:- pulling of a relay," instead of, * DISABLED ANNUNCIATOR
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ALARM." - Also, the Shift Supervisor who authorized the installation of-theTemporary Modification did not correlate it with the then four month old OTL,-
and as such, did not document the Temporary Modification as the work package .
associated with the removal of the relay in the OTL.
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DESCRIPTION OF EVENT: (Cont'd).
On September 5, 1991, work was started for the installation of a Database;- Change Request (DBCR) to modify the set / reset tag, print number device, and
termination data of the rod position deviation monitor PROTEUS computer point.The work package specifically addressed the inoperability of the rod position ,
deviation monitor and was added as part of the existing OTL. The work was4
completed at 2157 on September 13, 1991. The on shift Shift Supervisor wasuncertain of the monitor's operability status, so he decided to leave the '
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monitor " inoperable * uneil he could discuss the matter with the system ,
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On September 14, 1991, a second Shift Supervisor noticed the only listed workdocument, the DBCR, on the OTL had been closed. He did not remember the
-Temporary Modification and, after discussing the matter with the ShiftTechnical Advisor (STA) and satisfactorily manually toggling the alarm fromthe PROTEUS keyboard as a Post Maintenance Test (PMT), he incorrectly declaredthe rod position deviation monitor operable.
CAUSE OF THE EVENT:
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The Shift Supervisor who initially allowed the relay to be pulled and declaredthe monitor inoperable made an error in implementing the requirements of theplant procedure regarding the OTL system. The Shift Fupervisor who approvedthe Temporary Modification and the Shift Supervisor who declared the monitoroperable also erred in implementing these requirements. Additionally, the PMTused by the Shift Supervisor who declared the monitor operable was inadequate !
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to identify the monitor's inoperability and should not have been used as thebasis for operability determination. A contributing cause was that the '
Temporary Modification Request Form did not concisely identify the inoperablemonitor and the resulting compensatory measures,
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ANALYSIS OF THE EVENT:
Failure to perform the requirements of Technical Specifications 3/4.1.3.1,3/4.1.3.2, and 3/4.1.3.6 is reportable pursuant to 10CFR50.73(a)(2)(1)(B).Actuation of the rod position deviation monitor alarm is not an-indication-that the control rods are mispositioned such that core design limits areexceeded. It is prompt indication that the rod position, as seen by the DRPIsystem, does not agree closely with the demand position from the Demand ,
- Position Indication (DPI) system. Inoperability'of the rod position deviation,
monitor does not result in entry into a Technical Specification actionstestement, however, it does require-additional rod position surveillance.
i STPEGS performs the 12 hour rod position surveillances by comparing DRPI toDPI once every eight hours, and as such, no more than 8 hours went by without .
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rod position verification. However, this 12 hour surveillance does not- address operability of the rod position deviation monitor itself.
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CQRRECTIVE ACTION:
1. A memorandum to all Senior Reactor Operators stressing the need to exhaustall available references when making operability deterininations has beenissued. The memorandum also cautions aSainst the use of locally generatedPMTs unless they have baen properly reviewed and approved.
2. The Operations Department Manager will brief the Licensed Operators onthe importance of the OTL system as described in the configurationManagement procedure, specifically to address the importance ofdocumenting work documents in the OTL that will return an iterr tooperability. This will be completed by November 30, 1991
3. Licensed Operators and Chemical Operations persont.el will be made aware ofthis event during upcomine, formal tr aining classes. It will also beemphasized to Licensed Operators and Chemical Operators personnel thatconfiguration changes to operating plant structures, systems, andcomponents require control and documentation per the TemporaryModification procedure or other approved procedures or programs. Thetraining for the Licensed Operators will be coinpleted by November 30,1991, and by February 28, 1992 for the Chemical Operations personnel.
4. Plant Engineering has issued a training bulletin to make system engineersaware of this event. The bulletin also emphasized that configurationchanges to operating plant structures systems, and components requirecontrol and documentation per the Temporary Modifications procedure orother approved procedures or programs.
5. STPEGS has enhanced the OTL prograta to highlight the need to ensure a workrequest has been issued to repair the inoperable component.
6. STPEGS has reviewed all Temporary Modifications in both Unit 1 and Unit 2for component / system operability concerns.
7. STPECS has revised the Temporary Modification Request Form to aid theoperators in making operability determinations.
ADDITIONAL INFOPJiA110N:
A similar event occurred to Unit I regarding violation of TechnicalSpecification 3.1.3.1 and 3.1.3.2 on July 13, 1989, and was reported as LER89-016. " Technical Specifications Violation Due to Inadequate ProceduralControl Over a Plant Modification."
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ADDITIONAL INIVRMATION: (Cont'd)|
Additionally, there have bnen two LER's issued related to problems with theOTL, These LER's are Unit 1 89 010. " Failure to Perform Post Maintenance- Testing of a Charging Pump Recirculation Valve Due to Personnel Error," andUnit 2 89 010. " Violation of Technical Specifications Due to Personnel Error."
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