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| {{Adams
| | #REDIRECT [[05000368/LER-1980-037-01, /01T-0:on 800603,during Mode 1 Operation,Safety Injection Tanks C & D,Found to Have Boron Concentrations of 1,711 Ppm & 1,620 Ppm,Respectively.Caused by Design Error. Caused by Boron Stratification in Safety Injection Tanks]] |
| | number = ML19331D651
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| | issue date = 08/27/1980
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| | title = During Mode 1 Operation, Safety Injection Tanks (SIT) C & D Were Found to Have Boron Concentrations of 1711 Ppm & 1620 Ppm.Probably Caused by Dilution of SIT Makeup Path by Reactor Coolant
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| | author name = Shively C
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| | author affiliation = ARKANSAS POWER & LIGHT CO.
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| | addressee name =
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| | addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
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| | docket = 05000368
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| | license number =
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| | contact person =
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| | document report number = LER-80-037-01X, LER-80-37-1X, NUDOCS 8009030425
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| | package number = ML19331D649
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| | document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
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| | page count = 4
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| }}
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| {{LER
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| | Title = During Mode 1 Operation, Safety Injection Tanks (SIT) C & D Were Found to Have Boron Concentrations of 1711 Ppm & 1620 Ppm.Probably Caused by Dilution of SIT Makeup Path by Reactor Coolant
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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 = 05000368
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| | LER year = 1980
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| | LER number = 37
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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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| {{#Wiki_filter:A Ci Revised Report - Previous Report Date 6/17/80 NRC F ORM 366 U. S. NUCLE AR REGULATORY COMMISS60N (7 77)
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| LICENSEE EVENT REPORT EXHIBIT A CONTROL 8 LOCK: l l l l l l lh IPLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6
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| 8 9 LICENSEE CODE le 15 LICENSE NuwSEM 25 26 LeCEN>E IvFi J0 b7 CATb5 CON'T 106:1
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| 60 61 DOcetET huuSER 68 69 EVENT DAT(
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| 74 76 HFPoRT DATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h i o 12 i f Durina Mode 1 operation, Safety In.iection Tanks (SIT) "C"
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| & "D" were i | |
| i found to have boron concentrations of 1711 ppm and 1620 ppm boron con-1 io i3 i go i. i i centration, which is below the 1731 ppm boron concentration as per i
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| inisii T.S. 3.5.1.c.
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| The SIT "A"
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| & "B" boron concentrations were verified to i
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| io gi i be at acceptable levels.
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| Prompt reportable per T.S.6.9.1.8.b due to i
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| ,,,,, i simul taneous out of spec SIT's.
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| No similar occurrences.
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| 33 40 41 42 43 44 43 CAUSE OESCRiPTION AND CORREC(IVE ACTIONS h Cause of occurrence is believed to be dilution of the SIT makeup path by,
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| i,io,i the reactor coolant during extended Shutdown Cooling System operation.
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| 2 NAME OF PREPARER PHONE.
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| 8009030 M f
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| | |
| 1.
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| Reportable Occurrence Report No. 50-368/80-037 2.
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| Report Date:
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| 3.
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| ' Occurrence Date: 6/3/80 4
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| Facility: Arkansas Nuclear One - Unit II Russellville, Arkansas 5.
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| Identification of Occurrence:
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| Operation of the Emergency Core Cooling System with the Safe +y Injection Tanks (SIT) operability less conservative than tk least conservative aspect of the limiting condition for operation defined in T.S. 3.5.1.c.
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| 6.
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| Conditions Prior to Occurrence:
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| Steady-State Power X
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| Reactor Power _ 2815 Knth 4
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| Hot Standby Net Output
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| =925 Kwe Cold Shutdown Percent of Full Power 100
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| 's l
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| Refueling Shutdown Load Changes During Routine Power Operation Rcutine Startup Operation i
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| Routine Shutdown i
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| Operation Other (specify) i
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| (
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| l Description of Occurrence:
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| l Two SIT's boron concentration simultaneously out of specification for less than one hour.
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| During routine sampling of the SIT's, it was discovered that SIT "C" and "D" had boron concentrations less than 173:
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| m boron specified r
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| (
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| in T.S. 3.5.1.c.
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| SIT "A" and "B" boron concentrations were verified to be greater than 1731 ppm boron.
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| l i
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| Reportable Occurrence Report No.
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| 8.
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| Designation of Apparent Cause of Occurrence:
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| l 3esign Procedure Maniufactu.e Unusual Service Condition Including Environmental Insta11at: ion /
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| Construction Component Failure (See Failure Data)
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| Operator Other (specify)
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| Boration path dilution Based on local sampling tests, a portion of the SIT fill path may be diluted (from the RWT concentration) by reactor coolant during extend.
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| Shutdown Cooling System operation. With such dilution occurring during the snall makeup operations, the SIT boron concentration is decreased.
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| 9.
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| Analysis of Occurrence:
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| The SIT's renuire periodic makeup to maintain T.S. required levels due to volume contraction during unit cooldowns and volume reductions dur ir,g ncrmal operation.
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| Reportable Occurrence Report No.
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| 10.
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| ==Corrective Action==
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| 2 The SIT fill path and fill method is being evaluated to ensure undiluted boration. Boron stratification in the SIT is also being studied.
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| SIT "C" and "D" were returned to the Tech Spec required boron concentrations utilizing the feed-and-bleed method.
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| 1 11.
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| Failure Data:
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| There have been no similar occurrences.
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| t 11.
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| Failure Data:
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| 'i 1
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| 1 l
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| }
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| i i
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| f
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| }}
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| {{LER-Nav}}
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