ML19345D857

LER 80-010/03L-0:on 801117,safety Injection Pump 2P15A Motor & Pump Shaft to Coupling Keys Found to Be Sheared.Cause Undetermined.Pump & Motor Checked for Damage,Keys Replaced & Pump Operability Verified

ML19345D857
Person / Time
Site:	Point Beach
Issue date:	12/11/1980
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19345D840	List: ML19345D839 ML19345D857
References
LER-80-010-03L-01, LER-80-10-3L-1, NUDOCS 8012170615
Download: ML19345D857 (2)

Text

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O ~(7 776 LICENSEE EVENT REPORT CONTROL BLOCK. l l l l l l h (PLE ASE PRINT OR TY?E ALL REOUIRED INFORMATION) l0111

? 4 9 l W ILICENSE Il P lE B CODE l Hl 214 l@l15 0 l 0 l -l 0 lLICENSE 0 l 0 NUM6ER l 0 l 0 l - l 0 l 025l@l264 l 1L8 lCENSE 1l1 l 1l@l$7 L Al T Sdl@

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7 8 60 61 DOCKET NUM8ER M 69 EVENT DATE 14 75 REPORT O ATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h to12] lAt 0600 on 11-17-80, with the unit operating, the 2P15A safety injectioni io ;3; ; pump was taken out-of-service to repair an oil leak. While repairing l 10 l 4 l [the oil leak it was noted that both the motor and pump shaft to coupling l ln ;sj l keys were sheared; however, due to binding of the coupling on the shafts l 1018 l l the pump had remained operable. In accordance with T.S. 15.3.3.2.b an l l 0 l 7 l l orderly shutdown of the unit was started at 0600 on 11.-18-90 since l

! .3 ! s ; l repair of the pump was not completed in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. No similar events. l 7 $ 9 80 C DE CODE SUSCO E COVPONENT CODE SL8C D'E 5 E l0l9l l S l F l@ [E_J@ l Bl@ l P l U j M l P l X l X l@ W@ J @

7 8 9 10 11 12 13 18 19 20

_ SE QU E N TI AL OCCURPENCE REPORT REVISION LER RO E REPORT NO. COCE TYPE NO.

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el_ l42 Yl@ l43N l@ l44B l 5 l 8l 0l@47 CAUSE DESCRIPTION AND CCARECTIVE ACTIONS 1:10; 1The cause of the sheared keys is unknown. No loss of function of the l i i Ipump occurred however, because of binding between the couplina and I

, ii i7i lshafts. This fact is substantiated by acceptable monthly operability l 1, i 31 l tests . The pump and motor were checked for damage, the keys replaced I iii4i land operability of the pump verified prior to return to service at 1801.l 7 8 9 80 SA S  % POWER OTHER STATUS OtS O RY DISCOVERY DESCRIPTION Ii 15 l W@ l ll 0 l 0 l@l N/A l l B l@l Observed by mechanic l ACTIVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE I1 Ie8l 9l Z l @ ltoZ l@l N/A l l N/A l 7 11 44 49 80 PERSONNEL EXPO $URES NUY8E R TYPE DESCRIPTION l i l 71 l 0 l 0 l 0 l@l Z l@l N/A i l

PERSONNE L INJURI ES NUM8ER OESCRIPTION I1 la8 l9l 01010 l@l N/A 7 11 12 80 l

LOSS OP OR DAMAGE TO FACILITY TYPE DESCRIPTION li 191 l Z l@l10 N/A 8 0~' A 2 I- I b e l 7 8 9 80 ISSU E

• f7TO'1 I Y l TV f@ , radio, newspaper 11-17-80 DESCRIPTION l lllllllllll1l5 7 8 9 10 68 69 80 3 NAME OF PREPARER C.W. FaV PHONE: 414/277-7RII

1 1

4 ATTACHMENT TO LICENSEE EVENT REPORT NO. 80-010/03L-0 Wisconsin Electric Power Company Point Beach Nuclear Plant Unit 2 Docket No. 50-301 4

At 0600 hours0.00694 days <br />0.167 hours <br />9.920635e-4 weeks <br />2.283e-4 months <br /> on November 17, 1980, the 2P15A safety injection pump was taken out-of-service to repair a minor oil leak. The unit was operating at 100% power and the redundant safety injection pump, 2P15B, was tested operable prior to removing 2BlSA from ' service. While working on the pump, an inspection by the mechanic found the coupling-to-shaft key on both the motor end and pump end were sheared.

Problems were encountered while trying to repair the pump

because the coupling mechanically bound to the sha5t by the i

sheared keys and could not be hydraulically jacked off the shaft. Both the motor and pump shaf ts had to be cut and bored out of the coupling. These problems extended the repair time beyond the 24-hour time limit allowed by Technical Specification 15.3. 3.2.a for operation with one safety injection pump out-of-service, and an orderly shutdown was initiated at 0600 hours0.00694 days <br />0.167 hours <br />9.920635e-4 weeks <br />2.283e-4 months <br /> on November 18, 1980. Repair of the safety injection pump was completed and the pump satisfactorily tested at 1801 hours0.0208 days <br />0.5 hours <br />0.00298 weeks <br />6.852805e-4 months <br /> on November 18, 1980. The unit returned to line at 1905 hours0.022 days <br />0.529 hours <br />0.00315 weeks <br />7.248525e-4 months <br /> on November 18, 1980, but did not achieve full power until 0735 hours0.00851 days <br />0.204 hours <br />0.00122 weeks <br />2.796675e-4 months <br /> on November 20, 1980, because of delta flux limitations.

The exact time the keys were sheared is not known; however, the pump was evaluated to have been operable prior to being taken out-of-service on November 17, 1980. This is substantiated by the fact that the pump performed satis-l factorily during all monthly and annual inservice and system

[ tests. Further the coupling was so securely bound to the shaf ts that it could not be hydraulically removed. Either l

i nechanical or friction fusion which prevented removal 'of the I coupling would have continued to directly tie the motor. to the pump for'any eventual use.

Discovery of the sheared keys. and the required plant shutdown are reportable in accordance with Technical Specification 15. 6. 9. 2.B. 2.

The resident inspector was notified orally on November 17, 1980.

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