ML19257A174

LER 79-154/03L-0:on 791129,during Routine Calibr Check,Steam Generator B Support Temp Indicator Found Reading 5 F Above Actual Temp,Causing Support Temps to Read Below Tech Spec Limit.Caused by Drift in Zero Adjustment

ML19257A174
Person / Time
Site:	North Anna
Issue date:	12/28/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19257A172	List: ML19257A171 ML19257A174
References
LER-79-154-03L, LER-79-154-3L, NUDOCS 8001020405
Download: ML19257A174 (2)

Text

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- LICENSEE EVENT REPORT (PLEASE PRINT OH TYPE ALL REQUIRED INFORMATION)

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61 DOCKET ?.UV3E;; int 69 EVENT DATE /4 la REPOR T DATE Eu EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 On November 29. 1979 durina a rout *ne calibration check "R" stonm ennorntnr sonnnet o 3 j temperature indicator TI-AM111-B-1 was found readino 50r ahnvg thn actnni en-nnentnro I

O 4 [ Review of Ongrator lons revealed that sunnnre tomnorarnrns had ovisend which were O 5 thelow the Technical Snecification limit 225 0F uhen enmnensntnd for thn indientnr lV O 6 i n r rnr _ The hon 1th and snforv nf the nnnorni nyhlic wern not nffectnA hy this event I

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1 o IThe cause for tbn hinh tornnraturn indiention ton s drift in the indientnr's 7nrn ndins t l The indientor and Inon wero rncalihentna in ncened,nco with nnnlic,hle c,17- I 1 1 Imant.

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Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of I Docke t No. 50-338 Report No. LER 79-154/03L-0 Description of Event On November 29, 1979, with the unit at cold shutdown , the temperature indicator for the middle level of the "B" steam generator suppart (TI-AM111-B-1) was found reading 5'F higher than the actual temperature.

Probable Consequences of Occurrence Because the actual support temperature dif fered from the value indicated on TI-AM111-B-1 by 5'F, it was possible for the temperature at the middle of the support to drop below the Technical Specification limit of 225'F. In other words, when TI-AMlll-B-1 indicated a value of 229'F or lower, the support temperature would actually be below the 225*F limit. Review of operator logs revealed that temperatures had occurred which, when taking into account the error factor of the indicator, were contrary to T.S. 3. 4.10. 2. a . The health and safety of the general public were not af fected by this event. There are no generic implications associated with this occurrence.

Cause of Event The cause for the high indication was drif t in the temperature ind ica tor 's zero adjustment.

Immediate Corrective Action The indicator and associated loop were recalibrated in accordance with applic-able calibration procedores and then restored to operation.

Scheduled Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Recurrence No further actions are required.

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