ML18058B005

Part 21 Rept 23967:on 920513 & 0701,Farris Relief Valve RV-3128 & SI Tank Relief Valve T-82B Lifted Prematurely. Caused by Misalignment of Spring Adjustment Screw Bore in Valve Bonnet.Util Has 23 Subj Valves in Facility

ML18058B005
Person / Time
Site:	Palisades
Issue date:	07/30/1992
From:	Smedly CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Joseph Sebrosky NRC
References
REF-PT21-92 23967, NUDOCS 9208140134
Download: ML18058B005 (1)

Text

~','\ ..* *-*

• -~-- -* *- - ------

FACILITY: PALISADES REGION: 3 NOTIFICATION DATE: 07/30/92 UNIT: [1] [ ] [. ] STATE: MI NOTIFICATION. TIME:~. 12_: 48 [ET]

RX TYPE: [1] CE EVENT~' DATE: 077f21/92

• EVENT TIME: .. -.. J.:2.:.0 0 [EDT l NRC NOTIFIED BY: SMEDLY_ LAST UPDATE DATE:. 07 /30/92 HQ OPS~ OFFICER: - - JOS~H':i:SEBROSKY* . _.. *.

NOTIFICATIONS' EMERGENCY *CLASS :J-. NOT::::.AP:i>,L.ICABLE;:** -- **-.., ~;_:"'._.;;r ... **":""*- ..,

10 CFR SECTION:

CDEG" 21. 21 (c) (3) ( iy -.- .... DEFECTS1NONCOMPLIANCE'"  ! ~~~~R!-::{-..;

~IT I SCRAM CODE RX CRIT,INIT PWRI INIT RX MODE CURR PWRI CURR-RX MODE' .....~: ';

',f {

1 N y 99 POWER OPERATION 99 POWER OPERATION EVENT TEXT PREMATURE LIFTING OF RELIEF VALVE DETERMINED TO BE RELATED TO THE MANUFACTURE OF THE VALVE.

RELIEF VALVE RV-3128, SAFETY INJECTION TANK T-82B. RELIEF VALVE, LIFTED PREMATURELY ON MAY 13, 1992 AND AGAIN ON JULY 1, 1992. SUBSEQUENT REMOVAL AND TESTING OF THE VALVE DETERMINED THE CAUSE TO BE MISALIGNMENT OF THE SPRING ADJUSTMENT SCREW BORE IN THE BONNET OF THE VALVE. THIS MISALIGNMENT CREATED INCONSISTENT RELIEF VALVE SETPOINTS AND RESET VALUES.

THE RELIEF VALVE IS A FARRIS RELIEF VALVE MODEL NUMBER 2745PKD/S4. THE LICENSEE HAS NOT EXPERIENCED PREVIOUS PROBLEMS OF THIS NATURE. THE LICENSEE HAS 23 OF THESE MODEL VALVES IN SAFETY AND NON-SAFETY RELATED APPLICATIONS IN THE PLANT.

r

, 920130

• i \'

92DoR*~l4AOD.01Ea osooo25R5 i \\

P - - \ PD .. Li_

• I s. _  ; . -- .