05000280/LER-1981-010-03, /03L-0:on 810415,alarm Setpoints for RM-CC-105 & RM-CC-106 Found Greater than Tech Spec Limits on Several Occasions.Caused by Misinterpretation of Background & Insufficient Guidelines for Evaluation of Alarm Setpoint

/03L-0:on 810415,alarm Setpoints for RM-CC-105 & RM-CC-106 Found Greater than Tech Spec Limits on Several Occasions.Caused by Misinterpretation of Background & Insufficient Guidelines for Evaluation of Alarm Setpoint

ML18139B316
Person / Time
Site:	Surry
Issue date:	05/15/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B315	List: 05000280/LER-1981-010-03, /03L-0:on 810415,alarm Setpoints for RM-CC-105 & RM-CC-106 Found Greater than Tech Spec Limits on Several Occasions.Caused by Misinterpretation of Background & Insufficient Guidelines for Evaluation of Alarm Setpoint 05000280/LER-1981-023-03, /03L-0:on 810422,PT-39B-2 Indicated Snubbers to Be Inoperable Per Tech Spec 4.17.Caused by Leakage Around Valve Block or Through Connections at Reservoir. Inoperable Snubbers Replaced ML18139B314
References
LER-81-010-03L, LER-81-10-3L, NUDOCS 8105200296
Download: ML18139B316 (2)

LER-1981-010, /03L-0:on 810415,alarm Setpoints for RM-CC-105 & RM-CC-106 Found Greater than Tech Spec Limits on Several Occasions.Caused by Misinterpretation of Background & Insufficient Guidelines for Evaluation of Alarm Setpoint

Event date:
Report date:
2801981010R03 - NRC Website

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I On April 15, 1981, while reviewing completed PT-26.l's (radiation monitoring daily check), it was found that the alarm setpoints for RM-CC-105 and RM-CC-106 had been greater than the Tech Spec limit on several occasions.

This is contrary to T.S.

table 3.7-5 arld is reportable per T.S.-6.6.2.b(4).

The radiation monitors would have alarmed and closed the CC surge tank vent at a value not greater than three times background.

Independent effluent monitors were operable.

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e Surry Power Station, Unit 1 Docket No. 50-280*

Report No. 81-010/03L'-O Event Date:

4-15-81 RADIATION MONITORS (RM-'-CC-'-105, 106 )_ SETPOINT

1.

DESCRIPTION OF EVENT

2.

3.

On April 15,--1981, while reviewing completed PT-'-26.l's (radiation monitoring daily check), it was found that the alarm setpoints for RM-CC-105 and RM-CC-106 had been greater than the Tech. Spec~ limit on s.everal occasions.

Further investigation revealed a total of 65 days, since January 1, 1981, where the data indicates* that the alarm setpoint was greate:['. than the Tech. Spec~ limit of <

twice background.

This event is contrary to Tech. Spec. Table 3.7-5 and, is-reportable per Tech. Spec. 6.6.2. b(4).

PROBABLE CONSEQUENCES & STATUS *oF REDUNDANT.EQUIPMENT:

Increasing activity would be indicative of a leak from the Reactor Coolant System or other Radioactive Systems which transfer heat to the Component Cooling Sys tern.

During this period, the Radiation Monitors would have alarmed and closed the CC Surge Tank Vent Valve *at a_ value not greater than three times

. background.

Radiation Monitors that monitor the station's gaseous and liquid effluents remained operable.

Therefore, the health and safety of the public were not affected. *

CAUSE

The cause of this event has been determined to be a mis in te r:pre tat ion of

'background' and insufficient guidelines for evaluation of the Alarm Setpoint.

4.

IMMEDIATE CORRECTIVE ACTION

A station deviation was initiated and the completed PTs were evaluated.

5.

SUBSEQUENT CORRECTIVE ACTION:

None.

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