05000281/LER-1983-020-03, /03L-0:on 830413,while at 49% Power,Rod Position Indicators for E-11 & G-3 Greater than 12 Steps Out of Alignment W/Other Rods in Banks.Caused by Drift in Signal Conditioning Module.Instrumentation Calibr

/03L-0:on 830413,while at 49% Power,Rod Position Indicators for E-11 & G-3 Greater than 12 Steps Out of Alignment W/Other Rods in Banks.Caused by Drift in Signal Conditioning Module.Instrumentation Calibr

ML20132D162
Person / Time
Site:	Surry
Issue date:	05/13/1983
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20132D134	List: 05000281/LER-1983-020-03, /03L-0:on 830413,while at 49% Power,Rod Position Indicators for E-11 & G-3 Greater than 12 Steps Out of Alignment W/Other Rods in Banks.Caused by Drift in Signal Conditioning Module.Instrumentation Calibr 05000281/LER-1983-021-03, /03L-0:on 830413,while at 47% Power,Steam Flow Channel FI-2474 Indicated Less than Redundant Channel.Caused by Steam Leak in Transmitter Root Valve.Root Valve Replaced ML20132D131
References
LER-83-020-03L, LER-83-20-3L, NUDOCS 8507310229
Download: ML20132D162 (2)

LER-1983-020, /03L-0:on 830413,while at 49% Power,Rod Position Indicators for E-11 & G-3 Greater than 12 Steps Out of Alignment W/Other Rods in Banks.Caused by Drift in Signal Conditioning Module.Instrumentation Calibr

Event date:
Report date:
2811983020R03 - NRC Website

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EVENT DES 0*46* TION ANO 'EOS ABLE OONS!OVENCE5 h With the Unit at 49% power, the rod position indicators for E-11 and G-3 were I

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ATTACHMENT 1 SURRY POWER STATION, UNIT NO. 2 DOCKET NO:

50-281 REPORT NO:

83-020/03L-0 EVENT DATE:

04-13-83 TITLE OF THE EVENT: IRPI !!ALFUNCTION_

1.

Description of the Event With the unit at 49% power, the Rod Position indicators for E-11 and G-3 were observed to be greater than 12 steps out of alignnent with other rods in their respective banks. This is contrary to T.S.3.12.E.1 and reportable per T.S.6.6.2.b.(2).

2.

Probable Consequences and St_atus of Redundant Equipment _

The Rod Position indicators give continuous indication of the position of each control rod. The RPI misal'gunant did not af fect the control of rods G-3 or E-11.

Each rod was capable of being dropped, therefore, the health and safety of the public would not have been affected.

3.

Cause

The erroneous RPI indication for control rods E-11 and G-3 was the result of drif t in the signal conditioning, module.

In addition, the control room indicator for control rod G-3 was found to have drifted.

4.

In'ediate Corrective Action The rods were verified as not misaligned.

5.

Subsequent Corrective Action The ilgnal conditiening rodule for both RPI's were calibrated.

Also the cont rol roon indicator for t ed G-3 was calibrated.

"oth RPL's were returned to service.

6.

Action Taken to Prevent Recurrence.

one deened necensary.

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