05000280/LER-1982-109-03, /03L-0:on 821017,high Steam Flow Setpoints Determined to Be Greater than Tech Spec Limits.Caused by Error in Original Calculations to Set Voltage Calibr Steam Flow Instrumentation.Correct Voltages Calculated

/03L-0:on 821017,high Steam Flow Setpoints Determined to Be Greater than Tech Spec Limits.Caused by Error in Original Calculations to Set Voltage Calibr Steam Flow Instrumentation.Correct Voltages Calculated

ML20028A508
Person / Time
Site:	Surry
Issue date:	11/08/1982
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028A500	List: 05000280/LER-1982-109-03, /03L-0:on 821017,high Steam Flow Setpoints Determined to Be Greater than Tech Spec Limits.Caused by Error in Original Calculations to Set Voltage Calibr Steam Flow Instrumentation.Correct Voltages Calculated ML20028A499
References
LER-82-109-03L, LER-82-109-3L, NUDOCS 8211220244
Download: ML20028A508 (3)

LER-1982-109, /03L-0:on 821017,high Steam Flow Setpoints Determined to Be Greater than Tech Spec Limits.Caused by Error in Original Calculations to Set Voltage Calibr Steam Flow Instrumentation.Correct Voltages Calculated

Event date:
Report date:
2801982109R03 - NRC Website

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setpoints were determined to be greater than the Tech. Specs.

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is contrary to T.S. 3.7.B Table 3.7.1 and is reportable per T.S. 6.6.2.b(2).

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I i i o l lThe cause of this event was an error in the original calculations to set l i t i 1 i voltage for calibrating the steam flow instrumentation.

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'". ATT,ACHMENT 1 SURRY POWER STATION, UNIT NOS. 1 and 2 DOCKET NO:

50-280

<c REPORT NO:

82-109/03L-0 v'

EVENT DATE:

10-17-82 e

TITLE OF THE EVENT:

STEAM FLOW SETPOINTS > T.S.

'S' N

1.

Description of the Event :

With unit 1 at hot shutdown and unit 2 at full power, the high steam flow setpoints were determined to be 0.78% greater than the Tech. Spec. limits at 100% power, and 3.4% above the 'sech. Spec. limita at hot shutdown.

This potential problem was discovered during the investigation for unit 2 LER-82-46, (FC-2-485 Failed). The specific deviation from Tech. Spec. was calculated in Engineering Study 82-70.

This event is contrary to T.S. 3.7.E, table 3.7.1 and is rep'ortable per T.S. 6.6.2.b.(2).

2.

Probable Consequences and Status of Redundant Equipment:

Each steam line is provide'd with twa steam flow channels. High steam flow on 1/2 channels, for 2/3 stenmlines, coincident with low steam line pressure or low Tave, will initiate safety injection to mitigate the ef fects of a main steam line break.

A All redundant initiation signals for safety injection (SI) were available.

The high steam flow SI was demonstrated functional by several spurious high steam flow SI's.

Protection against a steate line break accident is also provided by low pressurizer pressure actuating safety injection, therefore, the health and safety of the public were not affected.

3.

Cause of the Event

The cause of this event was an error in t6e original calculations to set the voltages for calibrating the steam flow instrumentation. The steam pressure input used in the calculations was assumed to be constant, however, steam pressure varies with power.

'4.

Immediate Corrective Action

Engineering Study 82-70 was impicmented to determine the extent of the error and the best way to correct it.

5.

Subsequent Corrective Action:

The steam flow setpoints were adjusted to eliminate the error calculated in the Engineering Study.

6.

Action Taken to Prevent Recurrence:

An investigatien on the steam flow corrected setpoints of other protection functions are being reviewed.

,a Page 2 Report No. 82-109/03L-0 7.

Generic Implications:

Changes were required for Sur: y Unit 1 and Unit 2.