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| {{Adams
| | #REDIRECT [[05000321/LER-1981-062-03, /03L-0:on 810630,during Normal Operations, Isolation Valve for drywell-to-torus Sys Differential Pressure Instruments Found Closed,Isolating Instruments. Caused by Personnel Error.Valve Position Corrected]] |
| | number = ML20009F021
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| | issue date = 07/15/1981
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| | title = LER 81-062/03L-0:on 810630,during Normal Operations, Isolation Valve for drywell-to-torus Sys Differential Pressure Instruments Found Closed,Isolating Instruments. Caused by Personnel Error.Valve Position Corrected
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| | author name = Coggin 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 = 05000321
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| | license number =
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| | contact person =
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| | document report number = LER-81-062-03L-01, LER-81-62-3L-1, NUDOCS 8107280611
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| | package number = ML20009F015
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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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| =Text=
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| {{#Wiki_filter:mw n .u= = m . ,,um -n n m u u m . u n . --,u.,
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| l (7-77 l LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l 1 I (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATioN) 1 W
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| ~
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| lo lil8 l9Gl AlLICENSEE 7
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| El IlCODE Hl 1]@l 01 Ol -l 0l Oi 14 15 01 Ol 0 l -l 010 l@l LICENSE NUMBER 25 4 l 1111 26 Il 11@l$7 CAT LICENSE TYPE JO l
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| 58 l@
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| COWT loIii 7 8 SE ll 60l@l 015101010l3121Il@l01613 61 DOCKET NUMBER 68 69 10 18 11 l@l017 REPORT EVENT DATE 74 75 l1 l 5DATEl 81180l@
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| EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo 1211 Durina steady state power operation it was discovered that the isolationi 10 lal I valve for the drywell-to-torus system differential pressure instruments l lo 141 l (T48-N081, N082, N083) was closed, thereby isolating the instruments. I lo Isl i Redundancy was available although the instru.ments were isolated. ThereI lo is i i were no effects upon public health and cafety due to this event. This j
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| .lol7l l is a nonrepetitive event for the subject valve and instruments. I 10181 ! I E OCE SUSC DE COMPONENT CODE SUB dE SU E
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| . l o 191 II lE l@ l Al@ l C l@ lI l N l S IT l R lU l@ IS l@ [_Zj 20 7 8 9 10 11 12 13 18 19 SEQUENTIAL OCCUPRENCE REPORT REVISION
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| ,,_ EVENT YEAR REPORT NO. COLC TYPE N O.
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| O "LER/RONu'ug 18111 l-l 1016121 l/l 10 13 I I Ll l-l 10 l 32
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| ,,_21 22 23 24 26 27 28 29 30 31 K AC O ONP T ME HOURS S8 i FOR B. SUPPLIE MANUF RER l33X I@l34Z l@ l Z l@
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| 35 lZl@
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| 36 l0l0l0l0l 37 40 l41Y l@ l42 Yl@ lAl@-lXlXlXlXl@
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| 43 44 47 CAUSE DESCRIPTION %ND CORRECTIVE ACTIONS lilo t i The cause or the valve closure was apparently due to the failure to fol- 1 ii iiiilow procedure during the performance of a test or experiment request I ii i2, I#80-5 that was previously initiated on 6-4-81. The valve was returned I
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| 'lilali to the correct oosition. and the associated oersonnel were informed of I lii4i i the imoortance of complete adherence to procedures. I 7 89 80 STA S % POWER OTHER STATUS I O RY DISCOVERY DESCRIPTION
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| 'I115 l l E l@ l 0 l 9 l 7 l@l NA l l B l@l QC Inspector Observation l ACTIVITY CO TENT REL2ASED OF RELEASE AMOUNT OF ACTIVirY LOCATION OF RELEASE It le l l Z l @ L Zj @ l NA l l NA l 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION lil71101010l@lZl@l NA l PERSON N E L INJU IES NUMBER DESCRIPTION NA l
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| 'll la l8 l90 l 0 l 0 l@l12 7 11 80 S ' " ^"^ '
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| 'i y,8E ESC ,r'ON '^C' '''' @
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| NA l
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| . l i l 91 l Z l@l PUBLINTY n 8107280611 810715 NRC USE ONLY ISSUE D PDR ADOCK 05000321 %
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| L238 0_l lNl i@ DESCRIPTION s U45goa i i i i i i i iiiiiii; 7 9 10 68 69 80 %
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| NAME OF PREPARER C_f Coggin. SUDt. plt. Eng. Serv. PHONE: 912-367-7851 2,
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| LER #: 50-321/1981-062 Licensee: Georgia Power Company Facility Name: Edwin I. Hatch Docket #: 50-321 Narrative Report for LER 50-321/1981-062 During steady state power operation it was discovered on 6-30-81, that the low side isolation valve for the drywell-to-torus system differential pressure instruments (T48-N081, N082, and N083) was closed, thereby isolating the instrum-ents. The functions of these instruments were, respectively, as follows: 1. initiation of the differential pressure pump in the event of a low D/W-to-torus differential pressure; 2.
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| low lifferential pressure alarm, and 3. opening of a valve (T48-F204) to allow the system to go into a recirc mode, thereby stopping pressurization, in the event of a high differential pressure.
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| Upon discovery of the event recorder charts (T48-R631AGB) that monitor the D/W-to-torus differential pressure were reviewed, and it was determined that the D/W-to-torus differential pres-sure did not decrease below the 1.5 psi setpoint. The fact that these charts are reviewed each shift would have prohibit-ed a pt Mntial undetected high or low D/W-to-torus differen-tial pre sure. Also a redundant. valve (T48-F205) was availa-ble for the recirc mode in the event of a high differential pressure.
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| The cause of the event was apparently due to the failure to follow procedure during the attempts to perform test or exper-iment request #80-5 on 6-4-81. Investigation revealed that the valve was closed per the TER and not restored to normal.
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| This was caused by the fac.t that the test performance was aborted due to procedural problems and the fact that the test steps were not signed off per plant procedures in a chronolog-ical fashion.
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| The event was discovered during the performance of an unrelat-ed surveillance as a result of the observation by a site qual-ity control inspector. 'n7 i valve was returned to normal, and the associated reporting of the event was initiated. The associated personnel have been reminded of the importance of complete adherence to procedures.}}
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