05000339/LER-1981-056-03, /03L-0:on 810702,channel TE-2432D in Tave Protection Loop 2 Failed in High Direction.Cause Unknown. Failed Resistance Temp Detector Removed from Svc & Spare (TE-2432C) Installed

/03L-0:on 810702,channel TE-2432D in Tave Protection Loop 2 Failed in High Direction.Cause Unknown. Failed Resistance Temp Detector Removed from Svc & Spare (TE-2432C) Installed

ML20009H376
Person / Time
Site:	North Anna
Issue date:	07/28/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009H370	List: 05000339/LER-1981-056, Forwards LER 81-056/03L-0 05000339/LER-1981-056-03, /03L-0:on 810702,channel TE-2432D in Tave Protection Loop 2 Failed in High Direction.Cause Unknown. Failed Resistance Temp Detector Removed from Svc & Spare (TE-2432C) Installed
References
LER-81-056-03L, LER-81-56-3L, NUDOCS 8108100036
Download: ML20009H376 (2)

LER-1981-056, /03L-0:on 810702,channel TE-2432D in Tave Protection Loop 2 Failed in High Direction.Cause Unknown. Failed Resistance Temp Detector Removed from Svc & Spare (TE-2432C) Installed

Event date:
Report date:
3391981056R03 - NRC Website

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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/2/ (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

/0/1/

REP 0R [L/ (6)

/0/5/0/0/0/3/3/9/

(7)

/0/7/0/2/8/1/

(8) /n/7 /2 /n /n /1/ (9)

Og DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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/ During Mode 3 operation, a channel in the TAVE Protection Loop 2 failed in the

/

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/ high direction. The failed channel (TE-2432D) was placed in the trip mode within/

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/ 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. Redundant channels remained operable, therefore, the health and safety /

/0/5/

/ of the general public were not affected. This item is contrary to T.S. 3.3.9 and/

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/ reportable pursuant to T.S. 6.9.1.9.b.

This event occurred previously on May 21,/

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/ 1980, and was reported on LER 80-007 dated May 21, 1980.

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/

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/

/I/A/ (11) [E/ (12) [E/ (13) /I/N/S/T/R/U/ (14) [E/ (15)

[Z/ (16)

SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO.

CODE TYPE NO.

(17) REPORT NUMBER

/8/1/

L-/ /0/5/6/

/\\/

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/L/

/-/

[0/

ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTJRER [C/ (18) [Z/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) [Y/ (23) /N/ (24) /L/ (25) /R/3/6/9/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/

/ The cause of the failure is not known at this time. The failed RTD was removed /

/1/1/

/ from service and an installed spare (TE-2432C) was placed into service. On the /

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/ following day a new RTD was installed in TE-2432D. The new RTD was calibrated

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/1/3/

/ and TE-2432D was returned to service.

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/1/4/

/

/

FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION (32)

/1/5/

[G/ (28)

/0/0/0/ (29) /

NA

/ (30)

[B/ (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 DAMAGE TO FACILITY (43)

TYPE

DESCRIPTION

/1/9/

/Z/ (42) /

NA

/

PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

/2/0/

/N/ (44) /

NA

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8108100036 81072f'"E OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 PDR ADOCK 05000339 S.

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Virginia Electric and Power Company North Anna Power Station, Unit #2 Attachment: Page 1 of 1 Docket No. 50-339 Report No. LER 81-056/03L-0

Description of Event

On July 2, 1981, during Mode 3 condition, the control rcom operator noticed that the TAVE Protection Channel Indicator (TE-24320) failed high. The Protection Channel was placed in the trip mode within I hour. This item is contrary to T.S. 3.3.2 and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence The consequences of this event were limited because the affected channel was placed in the tripped condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and the remaining redundant channels were available and functioning properly.

As a result, the health and safety of the general public were not affected.

Cause of Event

The cause of this event is not known at this time. However, the indicator read full scale with RCS temperature at 463 F which is an indicator of an "open" failure.

Immediate Corrective Action

The failed RTD was placed in the trip mode and an installed spare (TE-2432C) was placed into service. A new temperature sensor was installed in TE-2432D. The new RTD was calibrated and placed back in service.

Scheduled Corrective Action No scheduled corrective action is taken.

Actions Taken to Prevent Recurrence No action is taken to prevent recurrence.

Generic Implications There are no generic implications.