ML19341C604
| ML19341C604 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 02/27/1981 |
| From: | Trimble D ARKANSAS POWER & LIGHT CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.17, TASK-TM 1R-0281-13, 1R-281-13, 2R-0281-09, NUDOCS 8103030824 | |
| Download: ML19341C604 (9) | |
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AP"ANSAS POWER & LIGHT COMPANY POST OFFICE b; i 551 UTTLE ROCK, ARKANSAS 72203 (501)371-4000 February 27, 1981 1R-0281-13 2R-0281-09 Mr. Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 4
Subject:
Arkansas Nuclear One - Units 1 & 2 I
l Docket Nos. 50-313 and 50-368 License Nos. DPR-51 and NPF-6 NUREG-0737, Item No. II.K.3.17 Report on Outages of ECC Systems Eile:
1510.6, 2-1510.6)
Gentlemen:
In accordance with our December 19, 1980 letter, attached are the subject reports for both AND-1 (Attachment 1) and ANO-2 (Attach-ment 2).
Very truly yours, M e. F J David C. Trimble Manager, Licensing i
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ATTACHMENT 1 Report on Outage of ECCS Components for Arkansas Nuclear One - Unit-1 1
1
1.
Date:
10/3/76 Duration: 10.9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> ECC System or Component: Primary Makeup Pumps "C" & "B" Cause:
Primary Makeup Pump removed from service due to pipe weld leak in the suction relief line.
Redundant pump (P36B) placed in service; however, pump discharge pressure degraded, due to impeller failure, after approximately 1h hours of service.
Pump P36C was returned to E.S. Standby until the following day, then was removed from ser-vice for leak repair, leaving one operable Makeup pump.
Corrective Action:
Primary Makeup Pump "C" suction relief line pipe weld leak repaired.
Pump returned to service, giving the two required pumps operable status.
(
Reference:
LER's 50-313/76-029 and 76-030) 2.
Date:
11/22/77 Duration: 52.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> ECC System or Component: Reactor Building Emergency Cooling Fan Cause:
Reactor Building Emergency Cooling Fan inoperable where the two remaining cooling fans were not powered from operable independent emergency buses.
Cooling fan motor failed due to lack of bearing lubrication.
Corrective Action:
Unit was brought to cold shutdown conditions as required by the conditions of the Technical Specifications Limiting Condition for Operations.
All cooling fans were inspected and repaired, as necessary.
A lubrication requirement was added to the fan pre-ventive maintenance program.
Outage time was 361 hours0.00418 days <br />0.1 hours <br />5.968915e-4 weeks <br />1.373605e-4 months <br />.
(
Reference:
LER 50-313/77-021) 3.
Date:
9/26/78 Duration: 12.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> ECC System or Component: Borated Water Storage Tank Cause:
i Borated Water Storage Tank boron concentration less than the Tech-nical Specifications required 2270 ppmb due to unidentified causes.
Corrective Action:
Boron concentration increased to required amount.
(
Reference:
LER 50-313/78-026)
Date:
11/21/78 Duration: 23.6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> ECC System or Component: Borated Water Storage Tank Cause:
Borated Water Storage Tank boron concentration less than the Tech-nical Specifications required 2270 ppmb due to condensate valve misalignment.
Corrective Action:
Closed valve and increased boron concentration to required amount.
(
Reference:
LER 50-313/78-030) 5.
Date:
10/8/79 Duration: 1.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> ECC System or Component: Engineered Safety Feature Valve associated with Sodium Hydroxiv ES operation w
Cause:
Sodium Hydroxide Tank discharge valve, CV1617, declared inoperable due to a control power fuse failure caused by a control wire being pinched and grounded to the valve operator cover.
Valve failed in the ES position (open).
Corrective Action:
Valve operator was repaired and maintenance personnel were cautioned.
(
Reference:
LER 50-313/79-018) 6.
Date:
4/7/80 Duration: 6.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> ECC System or Component: Loop "B" High Pressure Injection Valve Cause:
High Pressure Injection Valve, CV-1227, failed to open on demand due to the valve operator manual engaging level stuck in the engaged position.
Corrective Action:
Valve operator repaired and returned to service.
(
Reference:
LER 50-313/80-013) i
ATTACHMENT 2 Report on Outage of ECCS Components 1
for Arkansas Nuclear One - Unit-2 i
4 r
1.
Date:
9/16/78 Duration: 18.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> ECC System or Component: Refueling Water Tank Cause:
Refueling Water Tank level below Technical Specifications required 91.7% (indicated) due to inadvertant ECC System actuation caused by a loss of relay power to ECC System components due to an inverter failure.
Corrective Action:
)
Unit taken to Cold Shutdown conditions and Refueling Water Tank level increased to required level.
(
Reference:
LER 50-368/78-006) 2.
Date:
1/30/79 Duration: 0.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> ECC System or Component: Safety Injection Tank "0" 1
Cause:
Safety Injection Tank pressure below Technical Specifications recuired 600 psig due to leakage past system check valee.
Corrective Action:
Safety Injection Tank pressure was immediately restored.
Valve rain-tenance was completed.
(
Reference:
LER 50-368/79-016) 3.
Date:
3/30/79 Duration: 12.9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> ECC System or Component: High Pressure Safety Injection Header "A" Ceuse:
l HPSI header removed from service to allow maintenance on the header relief valve.
Corrective Action:
Complete maintenance on relief valve and return header to service.
(
Reference:
LER 50-368/79-027) 4.
Date:
8/26/79 Duration: 1.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> ECC System or Component: Safety Injection Tank "D" Cause:
Safety Injection Tank level below Technical Specifications required 80.1% due to makeup valve failing to open on command.
Corrective Action:
Makeup valve was manually opened and level was returned to normal.
Valve maintenance was completed.
(
Reference:
LER 50-368/79-077) 5.
Date:
9/25/79 Duration: 0.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> ECC System or Component: Refueling Water Tank Cause:
Refueling Water Tank boron concentration less than the Technical Spacifications required 1749 ppmb due to incorrect tank makeup calculated boron concentration.
Inaccuracy due to insufficient mixing prior to tank sampling.
Corrective Action:
Procedure r.odification to require tank volume recirculation prior to sampling for coron analysis for RWT makeup concentration purposes.
(
References:
LER 50-368/79-085) 6.
Date:
6/3/80 Duration: 3.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> ECC System or Component: Safety Injection Tanks "C" & "0" Cause:
Safety Injection Tank boron concentration less than the Technical Specifications required 1731 ppmb.
Correction Action:
Increase tank baron concentration.
(
Reference:
LER 50-368/80-037) 7.
Date:
6/7/80 Duration: 2.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> ECC System or Compe ent: Sifety Injection Tank "0" Cause:
Safety Injection Tank bois c
..itration less than the Technical Specifications required 1731 pp.v-Corrective Action:
Increase baron concentration of SIT.
(
Reference:
LER 50-368/80-038)
8.
Date:
7/1/80 Duration: 9.6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> ECC System or Component: Safety Injection Tank "C" Cause:
Safety Injection Tank boron concentration less than the Technical Specifications required 1731 ppmb.
Corrective Action:
Increase boron concentration of SIT.
(
Reference:
LER 50-368/80-044) 9.
Date:
7/2/80 Duration: 7.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> ECC System or Component: Safety Injection Tank "0" Cause:
Safety Injection Tank boron concentration less than the Technical Specifications required 1731 ppmb.
Corrective Action:
Increase boron concentration of SIT.
(
Reference:
LER 50-368/80-044) 10.
Date:
9/2/80 Duration: 10.9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> ECC System or Component: Safety Injection Tanks "A"
& "C" Cause:
Safety Injection Tank boron concentrations less than the Technical Specifications required 1731 ppmb due to dilution of tank makeup path during extended Shutdown Cooling System operation.
Corrective Action:
Increase tank boron concentration and administrative controls to ensure accurate boron concentration values of makeup.
(
Reference:
LER 50-368/80-044 Rev 1) 11.
Date:
10/7/80 Duration: 0.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> ECC System or Component: Safety Injection Tank "A" Cause:
Safety Injection Tank pressure below Technical Specifications required 600 psig due to volume loss during sampling without capability of remote repressurization caused by inoperable valve.
1
Corrective Action:
SIT pressure was restored.
Valve maintenance was completed.
(
Reference:
LER 50-368/80-075) 12.
Date:
10/14/80 Duration: 0.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> ECC System or Component: High Pressure Safety Injection Pump "B" Cause:
HPSI pump tripped on overcurrent due to a motor bearing misalignment.
Corrective Action:
Complete corrective maintenance on pump totor.
Line up redundant HPSI pump to flow path.
(
Reference:
LER 50-368/80-078) 13.
Date:
11/29/80 Duration: 6.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> ECC System or Component: High Press Safety Injection Valve, 2CV-5056 Cause:
HPSI valve failed to close and could not be remotely throttled to meet HPSI system flow requirements.
Corrective Action:
Valve operator failure caused by a_ blown control power fuse.
Fuse was replaced and valve returned to operable status.
(
Reference:
LER 50-368/80-087) 14.
Date:
12/20/80 Duration: 5.9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> ECC System or Component: Refueling Water Tank Cause:
RWT level indications inoperable due to frozen transmitters caused by very low ambient temperatures and a de-energized heat tracing circuit.
Corrective Action:
Reactor was shutdown to Mode 3 operatien.
The level transmitters were thawed out and the heat tracing circuits re-energized.
(
Reference:
LER 50-368/80-091)
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