05000311/LER-1982-141, Updated LER 82-141/03X-1:on 821121 & 1204,P-250 Computer Inoperable Due to Parity Error.Caused by Periodic Increases in Ambient Temp Due to Insufficient Ventilation.Computer Reprogrammed & Action Statement Terminated: Difference between revisions

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{{Adams
#REDIRECT [[05000311/LER-1982-141, Forwards LER 82-141/03L-0.Detailed Event Analysis Encl]]
| number = ML20083F073
| issue date = 12/16/1983
| title = Updated LER 82-141/03X-1:on 821121 & 1204,P-250 Computer Inoperable Due to Parity Error.Caused by Periodic Increases in Ambient Temp Due to Insufficient Ventilation.Computer Reprogrammed & Action Statement Terminated
| author name = Rupp J, Zupko J
| author affiliation = PUBLIC SERVICE ELECTRIC & GAS CO. OF NEW JERSEY
| addressee name = Murley T
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
| docket = 05000311
| license number =
| contact person =
| document report number = LER-82-141-03X, LER-82-141-3X, NUDOCS 8312300129
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 4
}}
{{LER
| Title = Updated LER 82-141/03X-1:on 821121 & 1204,P-250 Computer Inoperable Due to Parity Error.Caused by Periodic Increases in Ambient Temp Due to Insufficient Ventilation.Computer Reprogrammed & Action Statement Terminated
| Plant =
| Reporting criterion =
| Power level =
| Mode =
| Docket = 05000311
| LER year = 2082
| LER number = 141
| LER revision =
| Event date =
| Report date =
| ENS =
| abstract =
}}
 
=text=
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EVENT DATE                74      76      REPORT DAT E      S0 00            61              DOCKET NUMSER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES O'a
' g l On two separate occasions, on November 21 and December 4,1982, during routine operation,
, ,,i g,i          j the control room opdrator discovered that the P-250 Computer was inoperable due to a g
        , ,      l parity error. Since it utilizes the computer for inputs and calculations, the Reactorg O 6      l Coolant System (RCS) subcooling monitor was declared inoperable and Action Statement 0 6 1 3.3.3.7a was entered. Wide range RCS temperature and pressure indications and steam
; o 7              l tables were available throughout the occurrence. The event constituted operat. ion in ag a        g degraded modo in accordance with Technical Specification 6.9.1.9b.                                                                                                      g 7          se                                                                                                                                                                          so SYSTEM              CAUSE          CAUSE                                                            COMP.          VAtyE I                                              CODE                CODE        SUSCODE                    COMPONENT CODE                      SUBCODE          SUSCOCE 7
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        ,        j reprogrammed and the action statement terminated. The power supply: breaker was replac9d i 3      l and the air conditioning units were repaired. DCRs are being formulated tu install                                                                                        l 4      l Safety Parameter' Display Systems.                                                                                                                                        l
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* NAME OF PREPARER                                                                                                PHONE:
 
          ~ O PSEG
            .Public Service Electric and Gas Company P.O. Box E' Hancocks Bridge, New Jersey 08038 Salem Generating Station December 16, 1983 Dr.-Thomas E. Murley
        . Regional Admiriistrator USNRC Region l' 631. Park Avenue King _of-Prussia, Pennsylvania                    19406
 
==Dear Dr. Murley:==
G LICENSE NO. DPR-75 DOCKET NO. 50-311                  ,
REPORTABLE OCCURRENCE 82-141/03X-1 SUPPLEMENTAL REPORT.
Pursuant to the-requirements of Salem Generating Station Unit No.'2 Technical Specifications, Section 6.9.1.9b, we are submitting supplemental Licensee Event Report for Reportable Occurrence 82-141/03X-1.
Sincerely yours, v    ,
J. M.-Zupko, Jr.
General Manager --
Salem Operations JR:kil df CC:    Distribution Ifl The Energy People                                                                    [
                                                                                                    % 21tG 120M) 1181 1:
 
a
          ~
Raport1 Number::    , 141/03X-1 '
Report Date:~          12-16-83
                    ~
Occurrenc_e. Dates: l11-21-82 J
12-04-82
                                    ~
      ' Facility:            Salem Generating = Station Unit 2
                            -Public-Service = Electric & Gas' Company Hancock's Bridge,-New Jersey- 08038
    -IDENTIFICATION OF 0CCURRENCE:
Accident Monitoring Instrumentation . Reactor Coolant System Subcooling Margin Monitor - Inoperable.
This report-was: initiated-by Incident Reports 82-482 and 82-486.
    ,EONDITIONS PRIOR TO OCCURRENCE:
    ~ Mode 1 - RX Power .81 5 - Unit Load 890 MWe.
DESCRIPTION OF OCCURRENCE:
    ! On two separate occasions, ~ at- 1420' hours, November. 21, 1982, and at 0730 hours,. December 4, 1982, during routine operation, the Control Room Operator' discovered that the-P-250 Computer was inoperable due to e parity-error; attempts to bootstrap the computer failed. Since it utilizes the_ computer for inputs and calculations, the Reactor Coolant i      System.(RCS) subcooling margin monitor in both cases was declared
    -inoperable,-and Technical Specification Action Statement 3.3.3.7a was entered. :Thefwide range RCS temperature and pressure _ indications were operable 1and: steam tables were available in the Control Room throughout:both occurrences.
APPARENT CAUSE OF OCCURRENCE:        .
The_ malfunctions of the P-250 Computer were apparently due to the power-supply-breaker tripping in association with periodic increases in cabinet ambient temperatures (approximately 80 F). The temperature
    ' increases were attributed to inadequate capacity of the cabinet cooling system.- Previous malfunctions of the P-250 computer were documented in LER'82-131/03L.
ANALYSIS OF OCCURRENCE:
    ~0perability of the accident monitoring instrumentation ensures that sufficient information is available on selected plant parameters to monitor and assess these variables following an accident.
    -Action Statement 3.3.3.7a requires:
With the number of operable accident monitoring channels less than the required r. umber of channels, restore the inoperable channel (s) to operable statue within 7 days, or be in at least hot shutdown within the next 12 hours.
 
r..
E i
                  ; LER '82-141/ 03X-1
[2-ANALYSIS OF-OCCURRENCE: (cont'd)-
                  .As noted, wide range indication and steam. tables were~available,
;                - allowing determination'ofcthe subcooling margin.- ~ The RCS.subcooling margin, monitor was returned.to" operation within the time specified by the action requirement.- The events therefore involved no undue risk to
;-                'the health and safety of the.                              7    pub.lic. Due to the loss of redundancy,
                  -the occurrences constituted operation in a degraded mode' permitted by-La: limiting' condition for-operation and were' reported in accordance with Technical: Specification 6.9.1.9b on December 8, 1982.
                  -CORRECTIVE' ACTION:
1 In'each case,.following investigation of.the: problem, the tripped breaker was reset and the bootstrap' program was successfully loaded.
                  ,In the-first instance, the P-250 Computer:was returned to service and-the RCS subcooling margin monitor was satisfactorily tested. Action
                  ^ Statement-3.3.3.7a was terminated.at 2000 hours, November 21, 1982.
4
                  'Following the.second occurrence, a temporary. fan was installed in the cabinet to-increase air circulation and improve cooling. The computer
.                  was returned to operation and the monitor was satisfactorily tested.
Action Statement 3.3.3.7a was terminated at 1000 hours, December 4, 1982.
Subsequently, the power supply breaker was replaced-and the air conditioning units were repaired. Since then, Unit 2 P-250 computer has performed satisfactorily. Due to occurrences involving Unit 1 P-250 Computer (documented in LER's 83-039/03L, 83-043/03L and
                  .83-045/03L), the following actions have been taken:
: 1. An information directive was issued to operations personnel to ensure proper response to P-250 Computer malfunctions.
: 2. Due to the recurrenceuof ventilation problems, an Engineering Department investigation-will be performed for possible 3
improvements to the-system.
i
: 3. DCR's 1EC-1365 ano 2EC-1366 are being formulated for the
                              ' design of Safety ~ Parameter Display Systems (SPDS).                                                                '
1,                              Installation is expected to be started late in 1984.
f                              Associated with installation of-these systems, the RCS subcooling monitors would be disconnected from the process computers.and connected to the safety.related SPDS computers.
                              -(The P-250' Computers are not safety related equipment)
FAILURE DATA:
k                  Westinghouse Electric Corp.
PRODAC-250 Computer                                                              ,,
Prepared By            J.          Ruon                                                    v
                                                                                                  / 'Gdfieral Wanager -
)                                                                                                    Salem Operations
                  'SORC Me'eting No.                  83-152
    's
_.. - _ .        . . . .;...._ ...,_..,.....,_..._._..._.,_..m_,...__..____.                              . _ _ , _ _ _ _ ,._.,,,_.... _ _ _
}}
 
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