ML19310A459: Difference between revisions

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#REDIRECT [[05000339/LER-1980-007-03, /03L-0:on 800521,during Mode 3 Operation,Channel in Tave Protection Loop 2 Failed in High Direction.Cause Is Unknown.Failed Channel Was Removed from Svc & Replaced by Spare]]
| number = ML19310A459
| issue date = 06/11/1980
| title = LER 80-007/03L-0:on 800521,during Mode 3 Operation,Channel in Tave Protection Loop 2 Failed in High Direction.Cause Is Unknown.Failed Channel Was Removed from Svc & Replaced by Spare
| author name = Cartwright W
| author affiliation = VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
| addressee name =
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
| docket = 05000339
| license number =
| contact person =
| document report number = LER-80-007-03L-02, LER-80-7-3L-2, NUDOCS 8006170587
| package number = ML19310A457
| document type = LICENSEE EVENT REPORT (SEE ALSO AO,RO), TEXT-SAFETY REPORT
| page count = 2
}}
 
=Text=
{{#Wiki_filter:m U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1) (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)
  /0/1/        /V/A/N/A/S/1/ (2)            /0/0/-/0/0/0/0/0/-/0/0/ (3)                  /4/1/1/1/1 (4)            / /    / (5)
LICENSEE CODE                      LICENSE NUMBER                        LICENSE TYPE                CAT
      !                /L/ (6)    /0/5/0/0/0/3/3/9/ (7)        /0/5/2/1/8/0/ (8)                  /o/6/1/1/8/o (9)
UR DOCKET NUMBER                EVENT DATE                        REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)
  /0/2/    /    During Mode 3 operation, a channel in the Tave Protection Loop 2 failed in                                /
  /0/3/    /    the high direction. The failed channel (TE-2432D) was placed in the trip                                  /
  /0/4/    /    mode. Redundant channels remained operable, therefore the. health and safety                            /
  /0/5/    /    of the general public were not affected. This item is reportable pursuant                                /
[0/6/    /    to T.S. 6.9.1.9.b.                                                                                        /
  /0/7/_    /                                                                                                              /
  /0/8/    /                                                                                                              /
SYSTEM        CAUSE        CAUSE                            COMP.                  VALVE CODE          CODE        SUBCODE      COMPONENT CODE        SUBCODE                SUBCODE
  /0/9/        /I/A/ (11) /E/ (12) /X/ (13) /I/N/S/T/R/U/ (14) LE/ (15)                              g/ (16)
SEQUENTIAL          OCCURRENCE        REPORT                    REVISION LER/R0    EVENT YEAR        REPORT NO.              CODE            TYPE                        NO.
(17) REPORT NUMBER      /8/0/      /-/ /0/0/7/        L\/        /0/3/            /L/          /-/        /_0/
ACTION      FUTURE      EFFECT      SHUTDOWN                ATTACHMENT NPRD-4                PRIME COMP.      COMPONENT TAKEN        ACTION      ON PLANT METHOD          HOURS      SUBMITTED FORM SUB. SUPPLIER MANUFACTURER
      /C/ (18)    /D/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) g/ (23)                  /N/ (24) /N/ (25) /R/3/6/9/ (2G CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)
  /1/0/    /    The cause of the failure is not known at this time. The failed RTD was                                    /
  /1/1/    /    removed from service and an installed spare (TE-2432C) was placed in                                      /
  /1/2/    /    service. A Maintenance Request was submitted for the removal and                                      /
  /1/3/    /    examination of the failed RTD during the next Mode 5 unit operating                                      /
  /1/4/    /    condition.                                                                                                /
FACILITY                                              METHOD OF STATUS        % POWER          OTHER STATUS                                  DISCOVERY DESCRIPTION (32)
  /1/5/      /C/ (28)    /0/0/0/ (29) /          NA      / (30)  DISCOVERY
                                                                  /A/ (31)        / OPERATOR OBSERVATION /
ACTIVITY        CONTENT RELEASED      OF RELEASE      AMOUNT OF ACTIVITY (35)        LOCATION OF RELEASE (36)
  /1/6/      /Z/ (33)    /Z/ (34)    /          NA              /    /              NA                                  /
PERSONNEL EXPOSURES NUMBER        TYPE        DESCRIPTION (39)
  /1/7/    /0/0/0/ (37) /Z/ (38) /            NA                                                                            /
PERSONNEL INJURIES NUMBER          DESCRIPTION (41)
  /1/8/  /0/0/0/ (40) /              NA                                                                                  /
LOSS OF OR TYPE DAMAGE TO FACILITY (43)
DESCRIPTION
  /1/9/    /Z/ (42) /            NA                                                                                      /    l ISSUE          ESCRIPTION (45) 0                                            NRC USE ONLY
  /2/0/      /N/ (44) /            NA                                                  /////////////
NAME OF PREPARER          W. R. CARTWRIGHT            PHONE          (703) 894 5151            _
 
p      -_
e s -
Virginia Electric and Power Company North Anna Power Station, Unit #2             
 
==Attachment:==
Page 1 of 1 Docket No. 50-339 Report No. LER 80-007/03L-0 Description of Event On May 21, 1980 during Mode 3 condition, the operations personnel noticed that the Tave Protection Channel Indicator (TE 2432D) failed high. The protection channel was placed in the trip mode. This item is reportable pursuant to T.S. 6.9.1.9.b.
Probable Consequences of Occurrence The consequences of this event were limited because the affected cnannel was placed in the tripped condition and the remaining redundant channels were available and functioning properly. As a result, the health and safety of the public were not affected.
Cause of Event The cause of this event is not known of this time. The failure will be determined when the RTD is removed during the next Mode 5 condition.
Immediate Corrective Action The failed RTD was disconnected from the circuit and an installed spare was connected, tested and placed in service.
Scheduled Corrective Action The failed RTD will be removed from the system during the next cold shutdown (Mode 5 condition) and repaired or replaced as required.
Actions Taken to Prevent Recurrence No further actions required at this time.
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