05000338/LER-1980-089-03, /03L-0:on 801029,while Investigating Cause of High Steam Flow Line Setpoint Drift,Setpoint Instrument Calibr Schedule Error Discovered.Caused by Improper Scheduling of Surveillance Testing

/03L-0:on 801029,while Investigating Cause of High Steam Flow Line Setpoint Drift,Setpoint Instrument Calibr Schedule Error Discovered.Caused by Improper Scheduling of Surveillance Testing

ML19345B908
Person / Time
Site:	North Anna
Issue date:	11/25/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345B893	List: 05000338/LER-1980-089, Forwards LER 80-089/03L-0 05000338/LER-1980-089-03, /03L-0:on 801029,while Investigating Cause of High Steam Flow Line Setpoint Drift,Setpoint Instrument Calibr Schedule Error Discovered.Caused by Improper Scheduling of Surveillance Testing
References
LER-80-089-03L-01, LER-80-89-3L-1, NUDOCS 8012020712
Download: ML19345B908 (3)

LER-1980-089, /03L-0:on 801029,while Investigating Cause of High Steam Flow Line Setpoint Drift,Setpoint Instrument Calibr Schedule Error Discovered.Caused by Improper Scheduling of Surveillance Testing

Event date:
Report date:
3381980089R03 - NRC Website

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y' U U.S. NUCLEAR REGULATORY COMMISSION t

LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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/1/0/2/9/8/0/ (8) /1/1/2/5/8/0/ (9) 0 DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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While investigating the cause of a high steam line flow setpoint drift, a

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surveillance scheduling error was discovered. Calibration of the high steam

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line flow setpoint instruments was scheduled once every two years rather than /

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at least once every 18 months as required by the T.S.

Required surveillance

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was missed. Both Units 1 and 2 were affected. This esent is reportable

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pursuant to T.S. 6.9.1.9.c.

The public health and safety were not affected.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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Improper scheduling of surveillance testing caused required testing to be

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missed. When the event was discovered calibration as required by the T.S. had /

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been performed on Unit 1.

Calibration as required by the T.S. was performed

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on Unit 2.

Test schedules were revised to comply with T.S. requirements.

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FACILITY METHOD OF STATUS

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PUBLICITY ISSUED DESCRIPTION (45)

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 801202OffirL

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Virginia Electric and Power Company Nerth Anna Power Station, Unit #1'

' Attachment: Page 1 of 2 Docket No. 50-338

' Report No.:LER 80-089/03L-0

' Description of Event -

.While investigating'the causeaof a high' steam line flow setpoint drift. (reported. in Unit 2. LER 80-68/03L-0),.a check of periodic surveil-lance procedures showed thet the turbine first stage pressure transmitters and associated summing amr. cards were calibrated once every two years.

Since the Technical Specifications required the steam.line. flow protection channels to be' calibrated at least once-per 18 months and the turbine first stage pressure transmitters and' associated summing amp cards are.

part of the high. steam ~line flow setpoint circuitry, the turbine.first stage pressure transmitters and their associated summing amp cards should have been calibrated on an 18 month schedule. The following table lists the calibration dates of the turbine first stage pressure transmitters and associated summing amps.

Unit 1 Train A Date__

Comments 11/24//6 Pressure transmitter and summing amp calibrated 9/27/77 Pressore transmir.ter and summing amp calibrated' 11/21/79 Pressure transmitter and summing amp calibrated 10/4/80 Summing amp calibrated 10/16/80 Summing' amp calibrated Train B Date Comments 11/24/76 Pressure transmitter and summing amp calibrated

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1/8/77 Pressure transmitter calibrated

10/19/77 Pressure transmitter and summing amp calibrated 11/26/79 Pressure transmitter and summing amp calibrated 10/4/80,.

Summing amp calibrated 10/16/80 Summing amp calibrated Unit 2 Train A Date

- Comments 8/25/78

, Pressure transmitter and summing amp calibrated 2/22/80 Summing amp calibrated

- 4/23/80 Pressure _ transmitter and summing amp calibrated 10/4/80 Summing amp calibrated 10/16/80 Summing. amp calfbrated Train B Date' Comments 8/29/78 Pressure transmitter and summing amp calibrated

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l10/4/80

. Summing amp calibrated

- 10/16/80 Summing amp calibrr'-d L

11/25/80-Pressure transmitter -calibrated s

L a

. s;

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' Attachment: Page 2 of 2 Examination of the above table shows that calibration intervals of 26 and 25 months for Unit 1 Train A and B channels occurred and calibration intervals of 20 and 27 months for Unit 2 Train A and B channels occurred.

This event is reportable pursuant to T.S. 6.9.1.9.c.

Probable Consequences of Occurrence Both first stage pressure transmitters provide control signals as well as-the~ protective function described above and indication in the Control Room. If the transmitters drifted significantly the drift would be detected. The summing cards which provide the high steam line flow setpoint are functionally checked once per month.

Large calibration errors would have'been detected by the monthly functional test. The degree of protection provided by the high steam line flow protection channels could have been reduced without detection; however, since gross calibration errors would have been detected and the safety analysis of the steam line break is relatively insensitive to the High Steam Line

. Flow SI actutation setting, the public health _and safety were not affected.

4 Cause of Event -

i Improper scheduling of surveillance testing caused required surveil-4 lance to be missed.

- Immediate Corrective Action

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When the event was discovered, calibration as required by the T.S.

i had been performed on Unit 1.

Further investigation showed that one of the Unit 2 turbine first stage pressure transmitters was out of calibration

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(this discovery was made after the' current outage started on October 31, 1980). The Unit 2 first stage pressure transmitter that was out of

.callbration was recalibrated on November 25, 1980, prior to Unit 2 start 1

up.

Monthly functional tests were modified to include checks of three calibration points on the summing amp cards to detect any significant drift. Calibration tests of.the turbine first stage pressure transmitters and asrociated summing amp cards were rescheduled to meet T.S. surveillance requirements.

. Scheduled Corrective Action No scheduled corrective actions are required.

J Actions Taken to Prevent Recurrence-No actions other than those described above are required to prevent recurrence.

Generic Implications

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.This event has no generic implications.

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