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| {{Adams
| | #REDIRECT [[05000366/LER-1980-045-01, /01X-1:on 800404,during Cold Shutdown,Leak Rate Test of Air Supply Accumulator Check Valves,For Automatic Depressurization Sys Valves Revealed Unacceptable Leakage Rate.Caused by Heat Damage from Installation Welding]] |
| | number = ML20004B957
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| | issue date = 05/27/1981
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| | title = Leak Rate Test Performed on Automatic Depressurization Sys Valves Revealed Unacceptable Leakage Rates.Probably Caused by Heat Damage from Installation Welding.Valves Will Be Replaced
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| | author name = Coggin C, Coggins C
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| | author affiliation = GEORGIA POWER CO.
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| | addressee name =
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| | addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
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| | docket = 05000366
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| | license number =
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| | contact person =
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| | document report number = LER-80-045-01X, LER-80-45-1X, NUDOCS 8106010353
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| | package number = ML20004B951
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| | document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
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| | page count = 2
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| }}
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| {{LER
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| | Title = Leak Rate Test Performed on Automatic Depressurization Sys Valves Revealed Unacceptable Leakage Rates.Probably Caused by Heat Damage from Installation Welding.Valves Will Be Replaced
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| | Plant =
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| | Reporting criterion =
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| | Power level =
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| | Mode =
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| | Docket = 05000366
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| | LER year = 1980
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| | LER number = 45
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| | LER revision = 1
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| | Event date =
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| | Report date =
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| | ENS =
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| | abstract =
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| }}
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| | |
| =text=
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| '/ b REPORT DATE
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| *J EVENT DESCRIPTION AND PRoRADLE CONSEcuENCES h o 2 IWith the unit in cold shutdown a leak rate test was performed qn the ADSI 1o: 31 I valves ' air supply accumulator, check valves.
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| The AE determined that thel inl41lleakage rates that were found were unacceptable and that a los of air I
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| o b isupply could lead to ADS inoperability.
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| This event caused no threat to I 10161 l publi c heal th o r s a f ety.
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| This is a nonrepetitive event for these volves.1 I
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| 33 34 3b 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li10)ICause of this event is believed to be heat damage from i ns tall a ti on wel d-l
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| These valves were to be replaced with sof t-seated valves durina i
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| sii3]Ithe Unit 2 refueling outage; however, parts were unavailable at that I
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| tilatltime, installation will be delayed until next refuelin g outage.
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| Proced-l 1 ' 14 I I ures for both uni ts have been revised to inform operntors of this failure mode._j 83 7
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| LER #
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| 50-366/1980-045, Rev._4 Licensee Geo.gia Power Company Pacility Name:
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| Edwin I.
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| Hatch Docket #:
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| 50-366
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| =Narrative=
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| Report for LER 50-366/J930-045, Rev. 4 W'ith the unit in cold shutdown a leak rate test was performed on the ADS valves air supply accumulator check valves in re ionse to IEB 80-01.
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| Results of this test were transmitted to the AE for analysis.
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| The AE determined that the leakage rates that were found were unacceptable and that a loss of air supply could lead to ADS inoperability.
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| The procedure that-dealt with the operator's response to an air supply low pres-sure alarm did not address this possibility.
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| These accumulator / check valve subsystems have no direct backup systems.
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| The air supply to the ADS valves can be obtained from the nitrogen inerting system or the instrument air system.
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| An automatic interlock has been installed which will line up the supply line to nitrogen in the event of an instrument air failure.
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| There is also a manual bypass line which can be used to supply nitrogen in the event of a failure of the automatic backup.
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| It is believed that this leakage was a result of heat damage to the valves which occurred during installation welding.
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| Replacement valves with extremely small leakage rates prior to installation showed unacceptable leakage after welding.
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| We were unable to obtain acceptable leakage rates for any of these valves.
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| The AE has specified a soft-seated model with an 0-ringed cap and longer nipples in order to alleviate the heat damage problem.
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| These soft-seated valves are on order and were to be installed during the current refueling outage.
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| There has been some degree of difficulty in obtaining the suitable valves.
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| Although the order has been expedited, delivery will not be made until after Unit 2 is restarted.
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| Replacement of these valves will be rescheduled for the next refueling outage.
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| The Unit 1 ADS air supply accumulator check 2
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| valves were leak rate tested during the 1981 refueling outage.
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| 2 out of 7
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| valves exhibited unacceptable leakage rates.
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| Due to unavailabiU ty of parts during the 1981 refuel-ing outage, these valves will be replaced with soft-seated valves during the next Unit I refueling outage.
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| Procedures tor both u-it have been revised to call for declaration of ADS inoperability upon receipt of an air supply line low pressure alarm.
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| This provides assurance that a possibly unsafe condi-tion will be recognized and dealt with.in a
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| controlled manner.
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| This is a nonrepetitive occurrence.
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| This event poned no threat to public health or safety.
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| }}
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| {{LER-Nav}}
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