05000327/LER-1980-183-03, /03L-0:on 801115,found Diesel Generator Surveillance Schedule Not in Compliance W/Tech Specs.Caused by Inadequate Procedural Guidance.Engineer Assigned to Review Generator Starts & Surveillance Frequency Increased
| ML19345D468 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 12/08/1980 |
| From: | Cottle W, Maddox S TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML19345D464 | List: |
| References | |
| LER-80-183-03L, LER-80-183-3L, NUDOCS 8012150170 | |
| Download: ML19345D468 (8) | |
| Event date: | |
|---|---|
| Report date: | |
| 3271980183R03 - NRC Website | |
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3 EQ 68 OOcu ET NuvoEM 68 63 EVENT DATE 34 73 PEPORT O AT E so EVENT DESCRIPT!ON AND PROS A8LE CONSECUENCES h 10 l 21 l Durine a review of the diesel generators' operating history. it was discovered that l
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An engineer has been assigned to ensure that all gi,7; l diesel generator starts are properly reviewed. The frequency of diesel generator i i l 31 l surveillance was increased to comply with Technical Specification' requirements.
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I Tennesssa Valley Authority Sequoyth Nuclear Plant LER SUPPIEMEh'TAL INFORMATION I
i SQRO-50-327/80183 Technical Specifications Involved:
4.8.1.1.2, 4.8.1.1.4, and Table 4.8-1 Reported Under Technical Specification:
6.9.1.13c i
Date of Occurrence: 11/15/80 Time of Occurrence: 1400 (c) l Identification and Description of Occurrence:
Following the identification of apparent discrepancies in the diesel generator test log, a comprehensive review of diesel generator operating history was initiated. The review included plant operating logs, surveillance test data-sheets, maintenance work requests, preoperational test records and potentially reportable occurrences associated with operation of the diesel generators. The j
review was directed towards updating the diesel e,enerator test log to the requirements of Regulatory Guide 1.108, Revision 1.
On 11/15/80, while evaluating the information compiled during the review, it was determined that there had been three (3) valid diesel generator failures 4
in the past 100 valid tests.. At the time of discovery, the diesel generators were being tested on a 31-day surveillance test frequency. Technical Specifi-i cation 4.8.1.1.2 and Table 4.8-1 require the-diesel generators'to.be tested on a seven (7) day surveillance test frequency based on three (3) valid failures.
Conditions Prior to Occurrence:
i Mode 5 - Temperature: 1820F Action Specified in the Technical' Specification Surveillance Requirements Met Due to Inoperable Equipment N/A Apparent Cause of Occurrence:
The procedural guidance provided to shift operations personnel was not adequate to ensure proper collection and evaluation of the diesel generator. test data.
It was not clear that failure information was to be evaluated.on a "per nuclear unit". basis instead of a "per diesel generator basis," and-that the four diesel.
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. generators were considered to be assigned to each nuclear unit for failure-i analysis. purposes. In addition, there was some confusion among the shift opera--
tions personnel as to the precise definitions of_validLand invalid tests and the application of the failure criteria given in Regulatory Guide. l.108.
Analysis of Occurrence:
Once the entries in the diesel generator test log were found to be of question-able accuracy, an extensive review program'was initiated to validate the history of diesel generator starts and start-attempts._ This was necessary in order to establish.an accurate accounting of valid tests and failures from the time of receipt of an operating-license until the present. During the review process, IE Inspection 1 Report-50-327/80-39 was received. The-report cited an item of non -
compliance for. failure to submit ' complete information on diese1' generator LER's
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MMN LER SUPPLEMENTAL INFORMATION (Continued)
Analysis of Occurrence:
(Continued) as required by Technical Specification 4.8.1.1.4.
The additional information required by Technical Specification 4.8.1.1.4 is submitted herein under the heading of Failure Data.
The frequence of diesel generator surveillance testing was maintained on the 31-day schedule during the review period. This was due to the interpretation at that point in time that the failure analysis was on a per diesel generator basis and that we were in compliance with the Technical Specification require-ments. On 11/15/80, this error was discovered and the diesel generators were placed on a three (3) day test schedule as an interim, conservative, action pending completion of the review. Subsequently, the determination was made that there had been a total of three (3) valid failures and the surveillance frequency was changed to a seven (7) day schedule in accordance with Technical Specification Table 4.8-1.
Corrective Accions:
Upon realization that the failure analysis was required to be performed on a per nuclear unit basis, the diesel generator surveillance frequency was changed to a three (3) day test schedule. This was maintained until the review was completed and final determination of valid failures was made. The determination that there had been three (3) valid f ailures resulted in changing the surveil-lance frequency to a seven (7) day test schedule. The seven (7) day test sche-dule is presently in effect.
The procedural guidance for maintaining the diesel generator test log has been clarified. Instructions have been posted on the diesel generator control panel to remind the shift operations personnel to record each start or start-attempt.
The diesel generator test log is being revised and updated with the information from the review of the diesel generators' operating history. This effort is expected to be complete by 12/6/80.
An engineer has been assigned to review the diesel generator test log on a routine basis until such time as the shift operations personnel are fully trained on the requirements of Regulatory Guide 1.108. This engineer is also available to advise the shift operations personnel on any required determina-tions involving the validity of diesel generator starts and failures.
The additional information for updating the diesel generators LER's as required by Technical Specification 4.8.1.1.4 is included in this report under Failure Data. We are now in compliance with reporting requirements and have the capability to provide this type information with the LER should we have another diesel failure.
Failure Data:
This data is submitted to provide the additional information required by Technical Specification 4.8.1.1.4 for all LER's that have been issued since receipt of the operating license.
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IER SUPPLEMENTAL INFORMATION (Continund)
Failure Data:
(Continued)
The following information is to supplement the LER's indicated and is classified as valid failures in accordance with the requirements in Regulatory Guide 1.108, Revision 1, August 1977:
LER SQRO-327/80171 Date/ Time of Occurrence: 10/16/80 / 1622 (c)
D/G Involved:
IB-B Failure No.:
3rd failure per last 100 valid tests Cause of Failure:
The diesel generator was tripped when an indicating light socket shorted during bulb replacement. The indicating light was in the shutdown relay circuit.
Corrective Measures:
The socket was repaired by adjusting the sleeve in-side the lamp socket.
Length of Time Inop:
2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 8 minutes Surveillance Freq.:
At the present time the surveillance frequence is every seven (7) days. This is in compliance with Regulatory Position C.2.d.
LER SQRO-327/80074 Date/ Time of Occurrence: 5/21/80 / 0827 (c)
D/G Involved:
1B-B Failure No.:
2nd Failure per last 100 valid tests Cause of Failure:
The diesel generator failed to stabilize within required ranges of voltage and frequency, due to a misadjustment of the sensitivity setting on the governor and voltage controls.
Corrective Measures:
The D/G 1B-B sensativity control was adjusted and diesel generator 1B-B was tested again. There was no instability observed in voltage o'r frequency.
Length of Time Inop:
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 32 minutes Surveillance Freq.:
At the time of failure the surveillance test schedule was at least once in every 31 days. The present schedule is once in every 7 days This is in compliance with the schedule of Regulatory Position C.2.d.
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Failure Data:
(Continued)
LER SQRO-327/80023 Date/ Time of Occurrence: 4/2/80 / 0815 (c)
D/G Involved:
2A-A Failure No.:
1st failure per last 100 valid tests Cause of Failure:
The diesel generator 2A-A feeder breaker failed to close during surveillance testing due to dirty control power relay contacts.
Cor ective Measures:
All power contacts were cleaned and the breaker tested satisfactory.
Length of Time Inop:
I hour and 30 minutes Surveillance Freq.:
At the time of failure the surveillance test schedule was at least once in every 31 days. The present schedule is once in every 7 days. This is in compliance with the schedule of Regulatory Position C.2.d.
The following information is to supplement the LER's indicated and is classified as invalid failures in accordance with the requirements of Regulatory Guide 1.108, Revision 1, August 1977:
LER SQRO-327/80042 Date/ Time of Occurrence: 4/26/80 / 2030 (c)
D/G Involved:
2A-A Failure No.:
N/A - The failure was discovered when shutting down the diesel.
Cause of Failure:
A defective trip coil would have prevented the 86 LOR relay from tripping to remove the protective relay func-tions in the event of a SI signal.
Corrective Measures:
The defective coil was replaced and the diesel generator tested with a simulated SIS. The 86 LOR operated properly.
Length of Time Inop:
2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 16 minutes Surveillance Freq.:
At the present time the surveillance frequency is every seven (7) days. This is in compliance with Regulatory Position C.2.d.
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nm;3.m nyp_s LER SUPPLEMENTAL INFORMATION (Continued)
Failure Data:
(Continued)
I LER SQRO-327/80063 Date/ Time of Occurrence: 5/13/20 / 1320 (c)
D/G Involved:
lA-A, 1B-B, 2A-A, 2B-B Failure No.:
N/A - This failure was due to a procedural error and thus is classified as invalid in accordance with Regulatory Position C.2.e. (2) of Regulatory Guide 1.108.
Cause of Error:
Procedural error caused blackout, operator failed to recognize it as blackout. Diesels were inoperable for approximately 10 minutes while resetting.
Corrective Measures:
The procedure has been revised to provide appropriate steps of instruction and sign offs in the procedure.
Length of Time Inop:
10 minutes per diesel unit Surveillance Freq.:
At the present time the surveillance frequency is every seven (7) days. This is in compliance with Regulatory Position C.2.d.
LER SQRO-327/80087 Date/ Time of occurrence: 6/2/80 / 1635 (c)
D/G Involved:
lA-A, 1B-B, 2A-A, 2B-B Failure No.:
N/A - The D/G's all started properly on' SIS.
Damage was done when attempting to shutdown the diesels.
i Cause of Failure:
A relay stuck in the solid state protection cabinet which held a trip on the 86 LOR relays causing the coil to burnout when they were placed in the reset position.
Corrective Measures:
Replaced defective K-609 relay and burned out 86 LOR coils.
Length of Time Inoo:
3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> and 15 minutes Surveillance Freq.:
At the present time the surveillance frequency is every seven (7) days. This is in compliance with Regulatory Position C.2.d.
LER SQR0-327/80132 Date/ Time of Occurrence: 7/11/80 / 1351 (c)
D/G Involved:
lA-A Failure No.:
N/A - This failure is classified as invalid due to high crankcase pressure being a protective device that is cutout during emergency D/G starts (Regulatory Position C.2.d).
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NJ N LER SUPPLEMENTAL INFORMATION (Continued)
Failure Data:
(Continued)
LER SQRO-327/80132 Cause of Failure:
The diesel tripped on high crankcase pressure when the diesel was gived a simulated blackout signal to start for surveillance test. The operator stated that the blackout relay slipped during initiation and was then reclosed which provided a pumping action on the diesel and apparently resulted in the high crankcase pressure condition.
Corrective Measures:
Crankcase pressure switch was checked and the diesel was restarted and operated' properly. The operators were cautioned about letting these relay contacts bounce during testing.
Length of Time Inop:
54 minutes Surveillance Freq.;
At the present time the surveillance frequency is every seven (7) days. This is in compliance with Regulatory Position C.2.d.
LER SQRO-327/80140 Date/ Time of Cccurrence: 8/9/80 / 1435 (c)
D/G Involved:
lA-A, 1B-B, 2A-A, 2B-B Failure No.:
N/A - D/G's started properly, coils burned up while shutting down.
Cause of Failure:
86 LOR coil burned up when they were placed in reset position before blackout relay was reset.
Corrective Measures:
Replaced burned out coils, reset in proper order.
Length of Time Inop:
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 10 minates Surveillance Freq.:
At the present time the surveillance frequency is every seven (7) days. This is in compliance with Regulatory Position C.2.d.
LER SQRO-327/80143 Date/ Time of Occurrence: 7/31/E0 / 1323 (c)
D/G Involved:
N/A - The 43 TL switch was in the test position for diesel generator lA-A during this time which allows the SI signal to start its own diesel but prevented the CESlAY relay from starting the other diesels.
Cause of Failure:
A failure to identify that a 43 TL switch will prevent a start all diesel signals while allowing a single diesel start when a SIS is initiated for testing.
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(Continued) 1 Failure Data:
(Continued)
LER SQRO-327/80143 Corrective Measures:
Personnel re-instructed.
Length of Time Inop:
N/A - Diesels were operable at all times.
Surveillance Freq.:
At the present time the surveillance frequency is every seven (7) days. This is in compliance with Regulatory Position C.2.d.
LER SQRO-327/80145 Date/ Time of Occurrence: 8/7/80 / 1340 (c)
D/G Involved:
IB-B Failure No.:
N/A - D/G never failed to start, it was removed from serv!:e to perform a maintenance function.
Cause of railure:
Internal failure of a battery cell.
Corrective Measures:
Removed 3 cells from D/G battery 2B-B and installed in battery 1B-B.
Length of Time Inop:
55 minutes Surveillance Freq.:
At the present time the surveillance frequency is every seven (7) days. This is in compliance with Regulatory Position C.2.d.
LER SQRO-327/80092 Date/ Time of Occurrence: 6/26/80 / 0600 (c)
D/G Involved:
2B-B Failure No.:
N/A - This is not a D/G failure but a procedural error.
Cause of Failure:
Procedure failed to call attention to additional surveillance requirements. SRO failed to identify this requirement at shift change.
Corrective Measures:
A column has been added to the LCO status board review section with listing of additional surveillance re-quirements. Operations re-instructed on limiting condi-tions.
Length of Time Inop:
14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> Surveillance Freq.:
At the present time the surveillance frequency is every seven (7) days. This is in compliance with Regulatory Position C.2.d.
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