ML19031A919

LER 1976-024-01 for Salem, Unit 1, 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 Public Ser-Vice Electric and Gas Company 80 Park Place Newark, N.J:07101 201/622-7000 Vice President Production January 4, Mr. James P. O'Reilly Director of USNRC 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.

yours; CC: Director, Office of Inspection and Enforcement (30 copies)

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

1--

• "' . ~Report Number: jir24/3L Report Date:  !IP122/76 Occurrence Date:

• 12/13/76:

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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• LICENSEE EVENT REPORT ,

CONTROL BLOCK I 8

LIC1'NS£E 1.JCENSE !EVENT

, NAME t..ICENSE NUM8ER

• TYPe: TYf>t!

[![!] !N I J. I S I G I S I ~!, t5o I OI -1 OI OI OI OI 'f!I -1 OI qJ ~ 41 11 11 11 1:1, W-LlJ CATEGORVA'eo..:T ~5~~I OOCKET NUM8EA,:  !!VIENT CATE REPORT CATE

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EVENT DESCRIPTION*

. @]!]I During Mode 2 operation, low power physic~ testing in progress, a filter I 7 8 9 so

• @:§]I failure alarm was received on th~ RMS Channel RllA (Containment/Plant. Ve~t 7 89 ' ' '

@El Air Particulate). At the time of this occurrence, Channel RllA was 7 8

@liJ! selected to monitor the containment atmosphere. No release from the pla9t 7 8 9.. ' 80 I!]!] I vent was in progress.* No redundancy exists for Channel RllA.

• I&C 1*

7 8 9 PRIME 80

. SVST£M CAUSE COMPONENT COMPONENT .

COCE COOE . . COMPONENT COOE SUPPl..IEA MANUFACTURER' VIOLATION

@:I!] t.filru Lm IX !XIX !XIX IX I l1!l IX 19 !9 19 I

44. 47 lliJ T 8 9 10 11 12 17 43 48 CAUSE DESCRIPTION

. ~\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 ~9 so

[lfil I bell. The rotor. was frozen in place. The cause of this event was bearigg 7 89 so FACll..ITV METMOOOF STATUS lltPOWl!:A

• OTHER STATUS OISCOVERV OISCOVERV OESCJUPTION

[fill Lal. 10 !O !O !  !~..--*~N_/~A._____-,-!I ~

1 a. 9 10 12 13. 44* 45 46' 80 FOAM.OF ACTIVITY CONTENT RliLEASED OF REl..EAS!E AMOUNT OF ACTIVITY 1..DCATION OF Rltl...EASE GE 7 8 9 l..!J l]J 10 I

11 N/A

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PERSONNEL EXPOSURES

• NUMSl!:A TVPE 0SCAllJTION 1010101 lZJ l~-----~N~/~A~__,.__,.~__,.----......_~__,.---~--~--.-...,.-ftJ 1 9 11 12 13 SS PERSONNEL INJURIES NUMSE:R OSSCRIPTION

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• u 12 _________N~/_A~------~-------------,--------~---~J 1...,._* 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) I 7 8 9 80 IIJ!J.,,._..,......____. ,. . . __________. ,. . . . ,. . . __. ,. . . __________. ,. . . ____. ,. . . . ,. . . ___________. ,. . . __~--~

1 aa so NAME: _ _ _ _ _...__B_.-_E_._C_a_n_f_i_*e_.l_.d _ _ __ PHONE: (609) 365-7000 Ext.Salem-525

LER 76-24/31 12/21/76 l;;l -~ v 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: Barber - Colman Company Rockford, Illinois Model No.: DJl0-525 115 VAC 60 cpm 1152 RPM 100 in. lb. torque