ML19207C395

LER 79-019/01T-0:on 790809,upon Auto Start Signal,High Pressure Coolant Injection Pump Did Not Initially Start. Caused by Deterioration of Piston Rings in Valve Actuator. Rings Replaced & Test Completed Satisfactorily

ML19207C395
Person / Time
Site:	Cooper
Issue date:	08/20/1979
From:	Phillips D NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19207C390	List: ML19207C389 ML19207C395
References
LER-79-019-01T, LER-79-19-1T, NUDOCS 7909110576
Download: ML19207C395 (1)

Text

NRC FORM 366 U. S. NUCLE AR REGULATORY COMMISSION ,

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LICENSEE EVENT REPORT (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATIONI CONTROL BLOCK: l i

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? 8 3 LICENSEE CODE 14 15 LICENSE NUM8ER a'5 LICENSE TYPE Jo CON'T 0 1 S$,[RCE l L @l 0 l 5 l 0 l 010 l 2 l 9 l 8 @l 01810 l9 l 719 @l018 14 75 2l017l980l@

REPORT DATE 7 d 6J 61 DOCKET NUMBER bd 69 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h a 2 lUpon receipt of an auto start signal, the HPCI (High Pressure Coolant Injection) pump l o 3 did not initially start. However, a short time later the pu=p started and was used l o , j to increase reactor level. The RCIC system was operable and started as required, as l I were all low pressure injection systems. The event is not repetitive. [

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O H I gg 7 8 9 SYSTEM CAUSE CAUSE COYP VALVE CODE CODE SUBCODE COMPONENT CODE SUSCOCE SU8COCE g 3 lSlFjg ] g Flg V Al L Vl0lPlg g g 1d 19 20 Zj g i 8 9 to 11 12 13 SEQUENTI AL CCCU A AENCE REPORT PEVISION g na '['T i'Vj" l_,

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~d 21 22 ACTION FUTUAE EFFECT SHUTDOWN ATT AC HY E N T NP AD 4 PRlYE COMP. COMPONENT TAKEN ACTION ON PLANT YETHOD HOURS SUBulTTED FORMdLB. SU PP LI E R MANUFACTURER l Clg l36 Zl@ [ 0] 0l 0 l l Nl@ l@ l yg M l 3 l 2 l 2 lg l33A l@ 34 Gl@35 3' 40 41 42 43 44 47 CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS i o l The piston rings in the valve actuator for the turbine stop valve had deteriorated and l liiil were allowing oil to flow around the piston. The valve actuator is a 12 inch hydraulid i , l cylinder Model J-53. The rings were replaced and a simulated auto actuation test (S.PJ

, , l 6.3.3.3) was performed satisfactorily. Actuator fabricated by Mil.er Fluid Power. Th4

, 4 [ Preventive Mainte.unce Program revised to replace rings and check for ring leakage. I 90 7 8 9 STA 5 'sPOWER OTHER STATUS DISCO RY DISCOVERY DESCRIPTION i s

]@ l 0l 9l 9l@l NA I L*J@l System failed :.o operate when required l ACTIVITY COlTENT AELEASED OF RELE ASE AYOUNT OF ACTivlTY LOC ATION OF RELE ASE 7

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PERSONNEL E XPOSURES NUV8ER TYPE DESCRIPTIO PERSONNE L INJURIES NUY9ER DESCR*PTION i NA l 4

3 3 0 l 0 l 0 l@l11 12 30 w 355 C F OR O AM A GE TO F ACILITY .

i 3 TYPE l Z j@l C ESC PIP TION NA 79001105 $ gl

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NAME OF PREPARER