05000278/LER-1994-001, :on 940124,HPCI Sys Declared Inoperable During Performance of Quarterly Surveillance Test.Caused by Leak on HPCI Sys Hydraulic Control Line.Hydraulic Control Line Repaired & HPCI Sys Tested
| ML20067A280 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 02/03/1994 |
| From: | Geoffrey Edwards, Wasong A PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LER-94-001, LER-94-1, NUDOCS 9402170141 | |
| Download: ML20067A280 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(v), Loss of Safety Function |
| 2781994001R00 - NRC Website | |
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Peach Gottorn Atomic Power Station a
YECO ENERGY 5,Mh"--
De!ta. PA 17314 7739 717 a5S 7014 February'4, 1994 Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555 Locket No. 50-278
SUBJECT:
Licensee Event Reoort.
fftach Bottom Atomic Power Station-Unit 3 This LER concerns the High Pressure Coolant injection system being inoperabie due to a hydraulic oil line problem.
Reference:
Docket No. 50-278 Report Number:
3-94-001 Revision Number: 00 Event Date:
01/24/94 Report Date:
i.
02/03/94-Facility:
Peach Bottom Atomic Power Station RD1, Box 208, Delta, PA 17314 This LER is being submitted pursuant to the requirements of 10 CFR 50.73(a)(2)(v).
Sincerely,
/ Garrett D. Edwards Plant Manager GDE/GAJ:gaj enclosure cc:
R. A. Burricelli, Public Service Electric & Gas W. P. Dornsife, Commonwealth of Pennsylvania INPO Records Center T. T. Martin, US NRC, Administrator, Region i R. l. McLean, State of Maryland W. L Schmidt, US NRC, Resident inspector C. D. Schaefer, DelMarVa Power H. C. Schwemm, VP - Atlantic Electric
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l CCN 94-14 015 9402170141 9402o3 3
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PAGE 431 Peach Bottom Atomic Power Station - Unit 3 0 l 5 l 010 l 01217 l 8 1lOFl013 i
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High Pressure Coolant Injection System being inoperable due to a hydraulic oil line problem EVENT DATE 151 LE R NUMBE R tel REPORT DATE 17)
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A85TR ACT iLmt to T400 weces e e, epprommete$ hireen nrne e space typewntten Irnegl 11Sk On 01/24/94, the High Pressure Coolant injection (HPCI) system was declared inoperable during the performance of a quarterly Surveillance Test (ST). The HPCI system did not properly respond to flow controller changes during ST performance. Therefore, the applicable Technical Specification Limiting Condition for Operation (LCO) was entered.
The HPCI system did start within its specified time limit and did control system flow greater than the Tech Spec 5000 gpm limit, however, system flow could not be reduced to a lower value. The cause of this event has been determined to be a leak on the HPCI system hydraulic controlline. An investigation was performed which identified that a HPCI system hydraulic control line pulled out of its fitting at the system hydraulic governor. This condition prevented oil from getting to the system Servo thus not allowing the HPCI system flow rate to be reduced to a value other than its maximum. Following hydraulic control line repairs, the HPCI system was tested satisfactorily and the associated Tech Spec LCO was exited. Other hydraulic control line fittings associated with HPCI system were inspected and determined to be properly secured. An evaluation is currently in progress to determine what corrective actions are necessary to prevent future recurrences. No previous similar events have been identified.
NRC Form 36616 891U.S. NUCLE AR REGULATORY COMMISSION f xPIRES 4/30/92
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1 This report is submitted to satisfy the requirements of 10CFR50.73(a)(2)(v) describing
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conditions that alone could have prevented the fulfillment of a safety function.
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Unit Conditions at Time of Discoverv Unit 3 was in the "RUN" mode at approximately 100 % of rated thermal reactor (Ells:EA) power. There were no systems, structures, or components that were inoperable that contributed to the event.
Descriotion of the Event On 01/24/94 at approximately 1805 hours0.0209 days <br />0.501 hours <br />0.00298 weeks <br />6.868025e-4 months <br />, the High Pressure Coolant injection (HPCI) system (Ells:BJ) was declared inoperable during the performance of a quarterly Surveillance Test (ST-O-23-301-3) "HPCI PUMP, VALVE, FLOW, AND UNIT COOLER FUNCTIONAL AND IN-SERVICE TEST". The HPCI system did not properly respond to flow controller changes during ST performance. The purpose of this test is to confirm that the HPCI system is operable as specified in the Technical Specifications (Tech Spec) j and the Updated Final Safety Analysis Report. The HPCI system did not properly control system flow per its intended design, therefore, the HPCI system was considered inoperable. The applicable Tech Spec Limiting Condition for Operation (LCO) was entered. The NRC was notified via ENS at 1945 hours0.0225 days <br />0.54 hours <br />0.00322 weeks <br />7.400725e-4 months <br />. An investigation was performed which identified that a HPCI system hydraulic control line pulled out of its fitting at the system hydraulic governor. Following hydraulic controlline repairs, the HPCI system was tested satisfactorily and the associated Tech Spec LCO was exited on 01/25/94 at 0630 hours0.00729 days <br />0.175 hours <br />0.00104 weeks <br />2.39715e-4 months <br />. The HPCI system did start within its specified time limit and did control system flow greater than the Tech Spec 5000 gpm limit, however, system flow could not be reduced to a lower value.
Cause of the Event
The cause of this event has been determined to be a leak on the HPCI system hydraulic controlline. An investigation was performed which identified that a HPCI system hydraulic control line pulled out of its fitting at the system hydraulic governor. This condition prevented oil from getting to the system Servo thus not allowing the HPCI system flow rate to be reduced to a value other than its maximum.
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MRC Form 366A 16-HN
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Analysis of Event
No actual safety consequences occurred as a result of this event.
Prior to removing the HPCI system from operation for hydraulic control line repairs, the system would have started within its specified time limit and controlled system flow greater than the Tech Spec 5000 gpm limit, however, system flow could not be reduced to a lower value. In addition, this leak would have eventually dep'sted the control oil from the reservoir thus making HPCIinoperable. If a design basis acci*nt or transient would have occurred and HPCI failed, the Automatic Depressurization System (Ells:RV) was operable, if required, to reduce reactor (Ells:RPV) pressure to allow the Low Pressure Coolant injection (Ells:BO) Systems to inject. The Reactor Core Isolation Cooling (RCIC) system was also operable to provide core cooling.
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Corrective Actions
l Following hydraulic control line repairs, the HPCI system was tested satisfactorily and the associated Tech Spec LCO was exited.
Other hydraulic control line fittings associated with HPCI system on both units were inspected and determined to be properly secured. In addition, based on a review of Station history and Industry experience, there is no significant negative trends involving similar type fitting failures.
An evaluation is currently in progress to determine what corrective actions are necessary to prevent future recurrences. Replacement of these control lines and fittings with new lines and fittings is being considered.
Corrective actions will be incorporated as appropriate pending the results of the evaluation, j
Previous Similar Events
No previous similar events have been identified which involved HPCI or RCIC hydraulic
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control line fitting failures.
NRC Form 3GBA 16-891