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| {{Adams
| | #REDIRECT [[05000346/LER-1981-004-03, /03L-0:on 810107,decay Heat Pump 1-1 Would Not Start Until Second Attempt After Breaker Racked Out & Racked Back In.Cause of Pump Failure Attributed to Breaker Problem. Source of Problem in Breaker Not Found]] |
| | number = ML20003B299
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| | issue date = 02/06/1981
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| | title = LER 81-004/03L-0:on 810107,decay Heat Pump 1-1 Would Not Start Until Second Attempt After Breaker Racked Out & Racked Back In.Cause of Pump Failure Attributed to Breaker Problem. Source of Problem in Breaker Not Found
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| | author name = Frohne R
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| | author affiliation = TOLEDO EDISON CO.
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| | addressee name =
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| | addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
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| | docket = 05000346
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| | license number =
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| | contact person =
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| | document report number = LER-81-004-03L, LER-81-4-3L, NUDOCS 8102100614
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| | package number = ML20003B288
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| | document type = LICENSEE EVENT REPORT (SEE ALSO AO,RO), TEXT-SAFETY REPORT
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| | page count = 2
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| }}
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| =Text=
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| {{#Wiki_filter:_. .- - - .. . . .
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| hRC F ORM 36G U. S. NUCLE AR REGULATORY COMMISSION (7 7H
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| * LICENSEE EVENT REPORT CONTROL BLOCK: l l
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| l l 1 l dh 6 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 o 1 8 3 l0 l HLICENSEE l D lCODE B l S l141 l@l 15 0 l 0 l @ LICENSE l 0 l 0NUM6EH l o l 0 l 0 l 0 l 250 l 0 26 l@l4 l1 II LICENSE T'v l1 PE JJ l 1 l@L_J
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| $ 7 cA T bd _J G CON'T
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| EVENT DESCRIPT ON AND PROB ABLE CONSECUENCES h
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| ! I c 12 l l (NP-33-81-C3) On 1/7/81 at 1632 hours a control room operator attempted to start Decay l j g o ;3, l Heat (DH) Pump 1-1 as a normal step in establishing DH removal flow following entry l
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| ;o;.,;linto Mode 4 A second attempt was successful after the breaker was racked out and l l r., i s ; ; then racked back in. Being in Mode 4, the station did not enter the action statement l lo is i lof Tech Spec 3.5.3. This event is being reported to document a component failure. l DH
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| ["5 ]T) lThere uns no danger to the health and safety of the public or station personnel. l
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| ; a ;g l l Pump 1-2 was operable during this time. l SYSTEM CAUSE CAUSE COYP. VALVE CODE CODE SUBCODE COMPONENT CODE SUSCODE SUBCODE l0l9l lS lF l@ ]@- l Al@ i C l Kl T l B ] R l K j@ l A l@ lZ 18 19 20 l@
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| 7 8 9 10 11 12 13 OCCURRENCE BEPORT REVfS80N SEQUEN TI AL EVENT YEAR REPORT NO. CODE TYPE N O.
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| LER Ro
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| : @ ry.g 18111 1-1 101014l 14! 10131 IL I L-J LOJ 32 21 22 23 24 26 27 28 23 30 J1
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| 44 47 33 3b CAUSE DESCRIPTION AND SORRECTIVE ACTIONS Elec- l.
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| l1l0llThe cause of the pump failing to start can be attributed to a breaker problem.
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| Finding no obvious problem, the breaker was racked Iq.
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| l , , ltricians racked out t'.- breaker.
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| ! ,,,,, lA second attempt to start the pump was then successful. The pump was declared opera- l g,l3glble at 1647 hours the same day and placed in service. Further investigation under l is g4 i lMWO 81-1301 on 1/13/81 did not locate the source of the problem in the breaker. l 80 7 8 9 S % POWER OTHER STATUS dis OV RY DISCOVERY DESCRtPTION ST l5 lsl lD l@ l ol ol ol@l NA l [A_j@loperatorobservation l ACTIVITY CO TENT RFLEASED OF RELE ASE A90V*JT OF ACTivtTY LOCATION OF RELE ASE NA l j l5 Ie I Lzj @ Iz l@l NA 44 l l 45 80 7 8 9 10 11 PERSONNEL E XPOiUHES NUVBER TYPE DESCRIPTION l
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| 80 f
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| NRC USE ONLY
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| ! 1%Uf DE ScitiPliO*J
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| IrlolL'!.!f91 8 ') IO NA 68 69 80 7 N'16 m m Richard Frobne ggg.-(419) 259-5000, Ext. 294g
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| TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-81-03 DATE OF EVENT: January 7, 1981 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Decay Heat Pump 1-1 failed to start in Mode 4 Conditions Prior to Occurrence: The unit was in Mode 4 with Power (MWT) = 0 and Load (Gross MNE) = 0.
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| Description of Occurrence: On January 7, 1981 at 1632 hours, a control room operator attempted to start Decay Heat Pump 1-1 as a normal step in establishing decay heat removal flow following entry into Mode 4 The pump did not start during the initial attempt. The electricians were called to investigate. They racked out the breaker (AC 112) and they racked it back in. The next attempt to start the pump was success-ful. The pump had been inoperable for 15 minutes. The applicable Technical Specifi-cation 3.5.3 requires only one of these two pumps (decay heat / low pressure injection) to be operable in Mode 4. Therefore, the station did not enter an action statement.
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| This event is being reported to document a component failure.
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| Designation of Apparent Cause of Occurrence: The cause of the Decay Heat Pump 1-1 failing to start can be attributed to a breaker problem. When the breaker failed to close, electricians racked it out and inspected for any obvious problems. None being found, it was racked in, and a second attempt was made to start the pump. This attempt was successful. At a later date, further investigation did not identify the cause.
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| Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. Decay Heat Pump 1-2 was operable during this time.
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| Corrective Action,: Initially, maintenance electricians racked the breaker out and back in, and the pump could then be started. Under Maintenance Work Order 81-1301 mainten-l ance electricians performed a further investigation of AC 112. Connections were checked for tightness and operating mechanisms were checked for freedom of movement. The breaker was tested satisfactorily and returned to service. Additional investigation j of the breaker controls will be performed.
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| Failure Data: One previous reported occurrence of a decay heat pump failing to start I was reported in Licensee Event Report NP-33-78-13 (78-011).
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| LER #81-004 I
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| I l}}
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