ML19256B809
| ML19256B809 | |
| Person / Time | |
|---|---|
| Site: | Crane, Davis Besse  |
| Issue date: | 02/08/1978 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Knop R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19256B808 | List: |
| References | |
| TASK-TF, TASK-TMR NUDOCS 7908310119 | |
| Download: ML19256B809 (2) | |
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R. C. Tacp, Chief, P.cactor Frofacts Section 1, Region II' FF.T:
X. V. Se)/rit, Assistcnt Ofrecter for Technical Procrams, IE L. _.C T :
RE7.'EST FC'1 REVIEW AND DAi.UATIG.*i 0F TdE TRASSFER CIR2ITRY ASSOCIAT'D WITd THE PREFEP1.ED AC SCURCE c
AT LAVIS-GESSE 1 AIT5 F3032?H2 T.is rir.Orarkn is in rasparso to ycur rp.st for technical cssistance to detcrc.in-a if this facility's off::ite electrical system design r:zts the inteat of Sc-=ral Cesign Critsria (EC) 17 as it relates to tha irrediate uravailcbility of the preferrcd AC pcxar source follwing trar. ster,ts. Sgtifically, you que: tion Q.:ther the thirty (20) 50. nd ti.7:t del:y prict to cutecatic trar.sfcr to the preferred AC' p:.':r s;urce fcil..ing a re!ctor/turbira trip 5 /:nt c:c l'd writh tha St tion's c :r;:a:y proteire art acceptsble fer this t;. a ev a.,t.
P2 hi: :tWird the chva tr:nsfer schee and have discussed the it:n :ith b: -:ledce ble people fre both f!RR and litersees of operating g
- nwr reacht fccilitics ir.cluding DaYis-ses:a 1.
cn the 5: sis of th:se discussions us have detemir.e3 that the 30 second tiae delay feature asso:icted with the aut:catic transfer sche:e fcr offsite AC pesar sources :cpicyed by tha Davis-Sesse Ruclear Station is consistcnt with similar ti:ne delay features a: ployed by other EUR and Ph9 c;-: :: ting fe:ilitics. CE dcas ret censid:r this it:= to be an l
untsvismd safety qtc:stion. Vith respect to yota second concern, the lici::see has rcvicaed 'Turrir.a Trip Procedure," E? 1202.03, and his d?teraf.nsd that tS procedse it.ccrrectly called for ranual trippir.g the turbite gcrcratcr caJtput circuit breakers after a tLTbine t.-ip.
In the Ti ve.ter 29, 1977 reactcr/turbir.e trip event the peccebral e.rror precluded autratic trar.sfer to the preferred AC p:: Er socrce follcvir.g the anticipated 30 secor.4 delay period.
T.s ifcensee reports that a -cdification has since been incorporated in Davis-Sessa 1 EP 17.02.03, to preclude canual tripping of the g:ncratcr czic cct;ut cir:uit breaker follovirs a turbi.m trip.
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0 FEB 8 1973 R.
In view of the above inforreation, w believe that the transfer schece as discussede and the procedure revicts by the licensee ripres nt an acceptable resolution of the catter. We censider this tatter closed and plan no further action on it unless requested.
Karl V. Seyfrit, Assister.t Director for Technical Prosrans DfYiSicn of ileactor Cptratior.s Inspctica DISTRIBUTION Docket files (2)
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