ML19031A919

Failure of Radiation Monitoring System Channel Rlla, Containment/Plant Vent Air Particulate Monitor

ML19031A919
Person / Time
Site:	Salem
Issue date:	01/04/1977
From:	Schneider F Public Service Electric & Gas Co
To:	O'Reilly J NRC/IE, NRC Region 1
References
LER 1976-024-01
Download: ML19031A919 (4)

Text

Frederick W. Schneider Vice President Public Ser-Vice Electric and Gas Company 80 Park Place Newark, N.J:07101 201/622-7000 Production Mr. James P. O'Reilly Director of USNRC January 4, Office of Inspections and Enforcements Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. O'Reilly:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 7G-24/3L Pursuant to the requirements of Salem Generating* Station Unit No. 1 Technical Specifications, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 76-24/3L.

This report is required within thirty (30) days of the occurrence.

CC:

Director, Office of Inspection and Enforcement (30 copies)

~

Director, Office of Management Information and* Program Control (3 copies) yours;

1--

• "'. ~Report Number:

Report Date:

jir24/3L

!IP122/76 12/13/76:

Occurrence Date:

• Facility Salem Generating Station Public Service Electric.& Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Failure of Radiation Monitoring System Channel RllA, Containment/Plant Vent Air Particulate Monitor.

CONDITIONS' PRIOR TO OCCURRENCE:

Mode 2 operation, RCS temperature 547°F, RCS pressure 2235 psig, Low Power Physics Testing in progress.

DESCRIPTION OF OCCURRENCE:

During Mode 2 operation, the Containment/Plant Vent Air Particulate Monitoring Channel RllA failed, indicated by an activation of the Filter Failure Alarm.

The Shift Supervisor implemented Tech Spec Action Statement #20 for.Limiting Condition for Operation No. 3.3.3.1, Table

3. 3..,.6.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

After removal.of the low speed drive motor inspection revealed metal filings in the a:i;ea of the opposite drive end bell.

The rotor was fro*zen in place.

The apparent cause of the event was bearing failure.

ANALYSIS OF OCCURRENCE:

The RllA channel was inoperable for a period of less than 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

Tech Spec 3.4w6.l, Action Statement allows operation to continue for up to 30 days' provided that grab samples of the containment atmosphere are taken at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

Since the inoperable channel was returned to service in less than 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, the grab sample requirement was not required.

At the time of the occurrence; Channel RllA was selected to monitor the containment atmosphere.

During the time the channel was inoperable, no release was made through the plant vent.

At no_time did the event endanger the general public or site personnel.

CORRECTIVE ACTION:

The low speed filter drive motor was replaced with a spare and a functional test was performed to demonstrate operability.

The channel was then returned to service.

FAILURE DATA: ___ _

Manufacturer:

Barber -

Colman <;:ompany, Rockford, Illinois Model: DJl0-525, 115 VAC, 60 cps, 1152 RPM, 100 in. lb. torque Prepared by B. Canfield

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Manager - Sale SORC Meeting No.

122-76

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EVENT DESCRIPTION*

. @]!]I During Mode 2 operation, 7

8 9 low power physic~ testing in progress, a filter I

• @:§]I failure alarm was received on th~ RMS Channel RllA 7

89 so (Containment/Plant. Ve~t

@El Air Particulate).

At the time of this occurrence, 7

8 Channel RllA was

@liJ! selected to monitor the containment atmosphere.

No release from the 7

8 9..

I!]!] I vent was in progress.* No redundancy exists for Channel RllA.

• I&C 7

8 9 SVST£M COCE

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8 9 10 CAUSE COOE Lm 11 CAUSE DESCRIPTION

. COMPONENT COOE IX !XIX !XIX IX I 12 17 PRIME COMPONENT SUPPl..IEA l1!l 43 COMPONENT MANUFACTURER' IX 19 !9 19 I

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47 VIOLATION lliJ 48 pla9t 80 1*

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. ~\\After replacement,of' low speed drive motor, an investigation into the J

@::J!f I failed unit revealed metal filings in the area of the opposite drive end I 7

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[lfil I bell.

The rotor. was frozen in place.

The cause of this event was bearigg 7

89 so FACll..ITV STATUS

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10 12 ACTIVITY CONTENT METMOOOF OTHER STATUS OISCOVERV OISCOVERV OESCJUPTION

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45 46' 80 RliLEASED OF REl..EAS!E AMOUNT OF ACTIVITY GE l..!J l]J I

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10 11 1..DCATION OF Rltl...EASE I

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9 11 12 13 SS PERSONNEL INJURIES NUMSE:R OSSCRIPTION

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12 ao OFFSITE CONSEQUENCES

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LOSSOA CAMAGE TO FACIL;ITY TYPI!:

DESCRIPTION*

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7 8 9 BO ADDITIONAL FACTORS

!II!]! EVENT DESCRIPTION AND CAUSE DESCRIPTION (Continued on page 2) 7 8 9 I

80 IIJ!J.,,._..,...... ____..,...... __________..,........,...... __..,...... __________..,...... ____..,........,...... ___________..,...... __ ~--~

1 a a so NAME: _____...__B_. -_E_._C_a_n_f_i_* e_.l_.d ___ _

PHONE: (609) 365-7000 Ext.Salem-525

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-~ v LER 76-24/31

• 12/21/76 EVENT DESCRIPTION (Continued) personnel were notified.

Investigation revealed a failed low speed filter drive motor.

The low speed drive motor was replaced from spares and a functional check was done to verify operability.

The channel was then returned to service.

Channel down time was less than 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

(76-24/3L).

CAUSE DESCRIPTION (Continued) failure.

This failure is believed to be an isolated case and no remedial action is plann.ed.

Manufacturer:

Model No.:

Barber - Colman Company Rockford, Illinois DJl0-525 115 VAC 1152 RPM 60 cpm 100 in. lb. torque