05000280/LER-1981-004-03, Radiation Monitoring Recorder (RR-175) Found to Be Printing Erratically.Caused by Loose Gear on Balance Motor,Allowing Drive Cable to Slip.Set Screw on Drive Gear Tightened

Radiation Monitoring Recorder (RR-175) Found to Be Printing Erratically.Caused by Loose Gear on Balance Motor,Allowing Drive Cable to Slip.Set Screw on Drive Gear Tightened

ML18139B296
Person / Time
Site:	Surry
Issue date:	05/04/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B295	List: 05000280/LER-1980-015-03, During Radiation Monitoring Test,Radiation Alarm Setpoint for Component Cooling Sys Found Greater than Twice Background.Caused by Instrument Drift.Activity Levels Verified 05000280/LER-1980-028-03, W/Unit at 100% Power, Reduction in Svc Water Pressure to Charging Pump Experienced.Caused by Missing Valve Disk for 2-SW-113.Check Valve Replaced 05000280/LER-1981-004-03, Radiation Monitoring Recorder (RR-175) Found to Be Printing Erratically.Caused by Loose Gear on Balance Motor,Allowing Drive Cable to Slip.Set Screw on Drive Gear Tightened ML18139B294
References
LER-81-004-03X, LER-81-4-3X, NUDOCS 8105080269
Download: ML18139B296 (2)

LER-1981-004, Radiation Monitoring Recorder (RR-175) Found to Be Printing Erratically.Caused by Loose Gear on Balance Motor,Allowing Drive Cable to Slip.Set Screw on Drive Gear Tightened

Event date:
Report date:
2801981004R03 - NRC Website

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?4 7S REPORT OAT£ SD EV!:NT DESCRIPTION AND PROSAS1;.!: eoNSECUENCES@)

I On February 25, 1981, radiation monitor recorder (RR-175) was faurid ta be printing

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erratically.

This is contrary to T.s. 3. llA. 5; 3.*11. B.4, 4.9C and is reportable per

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I T.S. -6.6.2.b(4). A liquid waste release that was in progress was terminated

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The associated radiation monitors*, inc.luding the alarm and automatic

[§]TI actuating functions, were operable.

Therefore, the heal th-arid. saf~ty. of":1:he *pu!> lie

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.,7 III§J l The cause was a loose gear on *the* balance *motor, thereby allowing t:he drive cab] e ra CIII) / slip.

A set screw on the drive gear was tightened and the recorder returned to service.

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UPDATED REPORT-PREVIOUS REPORT DATED 3-:-27-81 ATTACH..111ENT 1 (PAGE 1 of 1)

SURRY POWER STATION, UNIT 1 DOCKET NO:

50-280 REPORT NO:

81-004/03X-l EVENT DATE:

02-25-81 TITLE OF REPORT:

RADIATION MONITOR RECORDER* (RR--115) "MALFUNCTION

1.

DESCRIPTION QF*EVENT:

With Unit 1 defueled, and Unit 2 operating s*teady state at 100% power,

• radiation monitor recorder (RR-175) was found to be printing erratically and therefore was declared inoperable.

This is contrary to T.S. 3.11.A.5, T.S. 3.11.B.4, and T.S. 4.9C and is reportable as per T~S, 6.6.2.b,(4).

2.

PROBABLE CONSEQUENCES AND* STATUS *op 'REDUNDANT: SYSTEMS:

The radiation monitor recorder (RR-175) serves to record, for permanent record, the gross activity of liquids* and gases being released, The recorder, in itself, does not mitigate the consequences of any system malfunction.

The associated radiation monitors*, including the alarm and automatic actuating functions, remained operable.

Th.e discharge tunnel radiation monitor and its recorder remained operable.

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

3.

CAUSE

The cause of the recorder malfunction was due to a loose gear on the balance motor which allowed the drive cable to slip.

4.

IMMEDIATE CORRECTIVE ACTION

The immediate corrective action was to terminate a liquid waste release *that had just started.

Also, as outlined in abnormal procedure 5.16 and 5.17, a check was made to insure no other* *releases were progress.

5.

SUBSEQUENT CORRECTIVE ACTION:

A set screw on the loose drive gear was tightened and the drive cable was replaced.

The recorder was proven operable and returned to service.

6.

ACTIONS TAKEN TO PREVENT RECURRENCE: -

Preventative maintenance is performed on *these recorders at least \\twice per year.

Therefore, no. additional actions are deemed neces-s*ary.

7.

GENERIC IMPLICATIONS:

This is a random event and as such 1.s not considered to be generic.