05000272/LER-2078-026-03, Failure of Motor Operated Valve

Failure of Motor Operated Valve

ML19031B167
Person / Time
Site:	Salem
Issue date:	07/12/1978
From:	Librizzi F Public Service Electric & Gas Co
To:	Grier B NRC/IE, NRC Region 1
References
LER 1978-026-03
Download: ML19031B167 (4)

LER-2078-026, Failure of Motor Operated Valve

Event date:
Report date:
2722078026R03 - NRC Website

text

I P~G Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /622-7000 Mr. Boyce H. Grier Director of USNRC Off ice of Inspections and Enforcements Region 1 631 Park Avenue King of Prussia, Pennsylvania* 19406

Dear Mr. Grier:

LICENSE NO. DPR-70 DOCKET NO. 50-272 SUPPLEMENTAL REPORT REPORTABLE OCCURRENCE 78-26/03L July 12, 1978

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Pursuant to the requirements of Salem Generating Station Unit No~ 1 Technical Specifications, Section 6.9.1.9.dt we ar~

submitting Supplemental Licensee Event Report-for Reportable Occurrence 78-26/03L.

Sincerely yours, F. P. Librizzi General Manager -

Electric Production r- "<

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Director, Office of Insp7ctio~*ib~"'-l!liijif lJOCKff fJLf CiiW!

and Enforcement (30 copies)

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

The Energy People 1

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.J~eport Npmber:

Report Date:

Occurrence Date:

Facility:

I 78-26/03L 7/12/78 5/23/78 Salem Generating Station Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 ID.ENTIFICA']:"ION OF OCCURRENCE:

Failure of motor oper~ted valve lSJl (Parallel suction from RWST)

CONDITIONS PRIOR TO OCCURRENCE:

Cold ShutdoW!l - Mode 5 DESCRIPTION OF OCCURRENCE:

While performing Technica]. Specification surveillance test 4.0.S, an open signal was initiated and valve lSJl did not move.

Maintenance personnel were notified and found that Limitorque motor windings had failed to ground.

Further investigation revealed that failed motor was ;i.ncorrect size.

Motor should have been 10 ft. lb~ rated and 5 ft. lb. was found instalied.

DESIGNATION OF APPARENT CAU~E OF OCCURRENCE:

Failure of motor operator was caused by excessive current which re-sulted in motor windings failing to ground.

Excessive current was a result of incorrect motor sizing.

Motor was replaced due to events described in LER 77-03/03L.

Person-nel error resulted in incorrect motor being installed.

ANALYSIS OF OCCURRENCE:

The incorrect motor installed on lSJl threatened to cause a reduction 6f the degree of redundancy of the engineered safety features in that the suction from the RWST no longer met the required single failure *criteria.

CORRECTIVE ACTION

The £ailed motor on the operator of lSJl was replaced with a 10 ft. lb.

torque motor and tqe valve was retested satisfactory.

Although this occurrence is felt to be an isolated case, twenty-five (251. motor operators from the Safety Injection, Service Water, Con-tainment Spray, Chemical and Volume Control, and Residual Heat Removal Systems will be selected at,random and valve operator motor sizing will be verified.

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~..,~ LER 78-26/03Le I *

• FAILURE DATA:

lSJl Motor Operator Manufacturer:

Limitorque Size:

SMB-00 Prepared by ____ T_.--:-L __

._s_p~e_n_c_e_r ________ _

SORC Meeting No.

43-78

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nc\\OULAI ORY COMMISSION

- ~te Report (7-771 LICENSEE EVENT REP.T lWvious Report Date 6/12/7)

CONTROL BLOCK: I I. I I I IQ (PLEASE PRINT OR TYPE ALL REQUIREC IN FORMATION I t

6 [ill *1 N !J I s I G I s I 1 IG)I o I o I -1 o I o I o I o I o I - I o I o 101 4 I 1 I 1 J 1 I 1 181 I I© 1

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1.JCENSEE CODE 14 15 l.ICENSE NUMBER 25 26 1.ICENSE* TYPE JO 57 CAT 58 CON'T (TilJ 7

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. OOCl<ET NUMBER 68 69 EVENT CATE 74 75 REPORT CATE 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES@

[]JI} I While performing surveillance test. an open sjqnaJ was initiated and

(]JI] I valve lSJl did not move.

Investigation showed Limitorgue motor winding.I

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failed.

Further investigation revealed that incorrect*size motor was

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installed.

Motor should have been 10 ft. lb. rated.

5 ft. lb. rated

[]JD was installed.

Tl)is is the first occurrence of this type.

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SYSTEM cooE I SIFI@

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CAUSE

CAUSE COMP.

VAi.VE CODE SUBCODE COMPONENT CODE SUBCOOE SUBCODE l.!.l w@ 1v1A1L1v101P1e ~ L!J@

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13 18 19 20 SEQUENTIAL OCCURRENCE REPORT

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l.ER!RO CVENT YEAR REPORT NO.

CODE TYPE

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1-NuMeER 21.

22 23 24 26 27 2S 29 JO 31 REVISION NC.

L.!..J 32 80 TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM :>UB.

SUPPi.i ER ACTION FUTURE EFFECT SHUTDOWN

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COMPONENT MANUFACTURER L£J@W@

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33 34 35 36 37 40 41 42 43 I L I 2 I. 0 I 0 '

CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @

44 47 [JI[] I Motor* replaced due to events described in LER 77-03/03L.

Personnel OJJJ error resulted in incorrect motor being installed.

Correct size motor IIIlJ installed and retested.

25 valves selected for motor size verification.I OJil IIEJ 1

a 9 FACILITY ljQ\\

STATUS

% POWER OTI-IER STATUS \\:::;:!

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ACTIVITY CONTENT t.=°\\

RELEASED OF RELEA$E

. AMOUNT OF ACTIVITY DE W@ L!J@I N/A 1

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10

• 11 80 METHOD OF DISCOVERY DESCRIPTION @

OISCOVERY*

I W@lvalve Surveillance Test 44 45 46 80 I

• . 1.0CATION OF RELEASE @

Nl:A 44 45 80 PERSONNEL EXPOSURES

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NUMBER

~TYPE~

DESCRIPTION~

ITEJ I o I o I o k~W~._..,____,N-.:./..;.A..;..._ ____________________ __.

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, 1 12 13 PERSONNEi. INJURIES c.\\

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1 a 9 11 12 so LOSS OF OR DAMAGE TO FACILITY f43\\

TYPE

DESCRIPTION

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ISSUEOC,;\\ DESCRIPTION~

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so NAMEOFPREPARER~~--T L_. __

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PHONE: (609)365-7000 Salen Ext.~

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