ML19322D363
| ML19322D363 | |
| Person / Time | |
|---|---|
| Site: | Oconee, Crane  |
| Issue date: | 07/15/1975 |
| From: | Wandling G BABCOCK & WILCOX CO. |
| To: | Bailey J, Logan E, Rogers L BABCOCK & WILCOX CO. |
| Shared Package | |
| ML19322D364 | List: |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8002110701 | |
| Download: ML19322D363 (2) | |
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Distribution Frr.c G. K. L'audling, Technical Support (2451) r.o : 3.;
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(Date Eler:tremetic Relief Valve Malfunction July 15, 1975 l w. e..........................; w..i r Distribution L. C. Rogers E. L. Logan J. A. bailey G. E. Mit.chell.
R. J. Baker C. A. Creacy Refercrce:
620-0009 SPR-107 "E]cetron:atic Relief Vahe Malfunction" -
Attached The ette hed S?R documsats a problem wh$ch resulted from corrosion of the lever pin, lever hin;;c and solenoid bracket of the subject valve.
11 case advice your customer to conduct periodic inspections for presenc.c of corrcclen products and to perform manual / visual checks for freecou of rcotion during plant shutdostr.r.
C. A. Crcacy is recuested r verify with Duke that they intend to cecpt a rurretil.nce inspect 3r pregrma on thin velve for all th::.5 uni ts.
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CLECTROFIATlc RELEIF VALVE }!ALFUNCTIQN j
G2SCitiPT;0!! 0F PRCULEll On Fricay, June 13th, Duke reduced power to 12% FP in pre-.
paration to cold chutdown for RCP sedl replacement. During the transition from turbine to turbine bypass the primary system experienced a pressure transicut to 2267, mig. The power relief valva actuated at 2257 psig and fai3cd to close. This.l caused the Quench Tank ' rupture L sc'to rupture. Failure to promptly close the 1
pouer relief isolation valve caused violations of the fuel compression curve, cooldo.m rates and RC pumpn NPSI! curve.
Inspection of the power relief valve af te'r
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i chutdoun indicated that the pilot valve icvur had re nined in the ported position l
,l preve.iting the. main valve f r9m rescating. ljestrain;a hmcke.
of the lever was caused by I
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JT Janis HSD, Lynchburg, KR Ellisen, NSD, Lynchburg, advised of problem. Valve d
has baan repaired (6/20/75) cud reinstalled. nepair was effected by increasing the, clearance for the Icver pin in both the solenoid bracket and the lever hinge beari'g k
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- HM fi TURIHO. AC110H RECG"IENDED BY SITE PERS0!!HEL l
N sites be advised to conduct periodic inspection / operation of valve to insure I
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cperability. Phen plant shuts down, perform manual / visual checks for freedota of motiens.
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