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| {{Adams
| | #REDIRECT [[05000265/LER-1979-009, Forwards LER 79-009/03L-0.Corrects Docket Number of Original Forwarding Ltr]] |
| | number = ML19309A979
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| | issue date = 03/17/1980
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| | title = Supplemental LER 79-009/03L-0:on 790429,while Measuring MSIV Limit Switchtrip position,13 of 16 Switches Were Set at Greater than 10% of MSIV Closure.Caused by Failure to Field Calibr Exact Limit Switch Trip Point.Switches Adjusted
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| | author name = Vahrenwald J
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| | author affiliation = COMMONWEALTH EDISON CO.
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| | addressee name =
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| | addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
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| | docket = 05000265
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| | license number =
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| | contact person =
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| | document report number = LER-79-009-03L, LER-79-9-3L, NUDOCS 8004020443
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| | package number = ML19309A974
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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
| |
| | Title = Supplemental LER 79-009/03L-0:on 790429,while Measuring MSIV Limit Switchtrip position,13 of 16 Switches Were Set at Greater than 10% of MSIV Closure.Caused by Failure to Field Calibr Exact Limit Switch Trip Point.Switches Adjusted
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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 = 05000265
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| | LER year = 1979
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| | LER number = 9
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| | LER revision = 0
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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:NRC FQ EM 366 U.S. NUCLEAR REGULATORY COMMISSloN 873D UPDATE REPORT--
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| PREVIOUS REPORT DATE 5-11-79 LICENSEE EVENT REPORT CONTROL 8 LOCK: l l
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| l l
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| l l
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| lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6
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| ~ foTi l l i I t l o I A l0 l 2 l@l 0 ] 0 l 0 l - l 0 l 0 l 0 l - l 0 l 0 l 0 l@l 4 l I l 1 l 1 l 1 l@l l
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| l@
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| 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 i
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| CON'T l0lij j'0y l L j@l 0l 5 l 0l 0 l 0 l 2 l 6 l 5 l@l 0 l 4 l 2 l 9 l 7 l 9 ]@l 0 l 3 l 1 l 7 l 8 l0 l@
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| 1 8
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| 60 63 DOCKET NUMSER 68 69 EVENT 0 ATE 74 75 REPORT DATE 60 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h 10f21l While measuring MSIV limit switch trip position, 13 of the 16 switches measured were l gog3; l found to be set greater than 10% of MSIV closure.
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| The 10% closure settings were l
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| ITTTl I originally set at the factory prior to installation and unit startup.
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| Monthly l
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| 10 i s t ! MSIV closure scram functional testing has been performed to verify scram function l
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| [TTs'l I operabl i l i ty.
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| This update report Completes the scram closure measurements which were l l0l7; j started on April 29, 1979
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| [
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| 10!81I I
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| 7 8 3 80 DE CODE S SCO COMPONENT COOE SU8 Code SU E
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| l0l9l [l l A l@ Q@ l C l@ l ll Nl Sl Tl Rl Ul@ l S l@ l Z l @
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| 7 8
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| 9 10 11 12 13 13 19 20 SEQUENTIAL OCCURRENCF REPORT REVISION LER EVENT YE AR PEPORT NO.
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| COOE TYPE N O.
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| @ yug/RO l7l9l
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| (---J l0l0l9l M
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| l 0l 3l [L j d
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| l1l aE 21 22 23 24 26 27 28 29 30_
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| 31 32 K N A ON ON PLANT MET HOURS S8 1 0
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| PO 8.
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| SUPPLIE MANUFACTURER
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| [_d@l zl@
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| [_z_j@
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| lzl@
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| l010l0l0l
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| [_Y,j @
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| lN l@
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| lNl@
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| lN l O l 1 l 5 l@
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| JJ 34 35 Jo 31 40 di 42 43 44 4;
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| CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li 10 l l The need for prior orecise field calibration of the exact limit switch trip point had l i i l not been deemed necessary to be performed.
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| A special procedure was develooed to enabl 4
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| , 2 l exact measuring
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| .of. the switch trip position in the field. As-foufid corrected switch I i 3 l positions are attached. The switches were adjusted to 1 0% closure and functionally l 1
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| tested.
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| g 7
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| 8 9 80 5
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| S
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| % POWER OTHER STATUS 01 O RY DISCOVERY DESCRIPTION lHl@ l0l0l0l@l NA l
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| lC[@l Test l
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| : s ACTIVITY CO TENT P.ELEASE@D OF RELEASE l NA l
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| l NA l
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| AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 PERSONNEt ExPOSUEES NUMBER TYPE
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| | |
| ==DESCRIPTION==
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| y l0l0l0l@lZl@l NA l
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| ' PERSONNe'L iNJu' RIES NUMBER
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| ==DESCRIPTION==
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| l0l0l0l@l NA l
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| i a 7
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| 8 9 11 12 80 LOSS OF CR DAMAGE TO FACILITY TYPE OESCRIPTION l Z l@l NA l
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| 1 9 7
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| 8 3 10 80 ISSUE @l DESCRIPTION NA l
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| lllllllllllll{
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| 2 0 i
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| 8 9 8 004 02.D %
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| l 309-654-2241 ext. 195
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| {
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| J. Vahrenwald NAoEO,,ng,4pgg ON E:
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| MSIV LIMIT SWITCH TRIP *0SITl0NS INBOARD VALVES SCRAM CHANNEL "A" SCRAM CHANNEL "B" valve number' as found corrected
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| % error as found corrected
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| % error 2-203-1A 14.5%
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| 9.6%
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| ' 5%
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| 14.4%
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| 8.2%
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| 4.4%
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| .2-203-1B' 18.0%
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| 9.4%
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| 8.0%
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| 16.0%
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| 8.4%
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| 6.0%
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| 2-203-1C 11 3%
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| 8.8%
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| 1 3%
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| 13 5%
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| 8.5%
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| 3.5%
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| 2-203-1D 16.0%
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| 9.8%
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| 6.0%
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| 12 7%
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| 8.8%
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| 2.7%
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| OUTBOARD VALVES SCRAM CHANNEL "A" SCRAM CHANNEL "B" vlave number as found corrected
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| % erroc as found corrected
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| % error 2-203-2C 20.8%-
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| 8.5%
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| 10.8%
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| 11.7%
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| 6.9%
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| 17%
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| 2-203-2D 4 9%
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| 8.9%
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| 0.0%
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| 6.0%
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| 7 9%
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| 0.0%
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| 2-203-2A 13 9%
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| 8.8%
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| 3.9%
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| 12.7%
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| 8.7%
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| 27%
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| 2-203-2B 9 9%
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| 9 9%
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| 0.0%
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| 10.1%
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| 8.2%
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| 0.1%
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| i:
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| }}
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| {{LER-Nav}}
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