PNO-III-80-135, on 800719,unit Manually Scramed from Approx 5% Power to Acquire Test Data Required by IE Bulletin 80-17. Water Held Up in One Scram Discharge Volume & Presence Not Indicated.Caused by Stuck Vacuum Breaker in Vent Piping
| ML19281C781 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 07/21/1980 |
| From: | Heishman R, Reimann F, Spessard R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| References | |
| IEB-80-17, PNO-III-80-135, NUDOCS 8009080200 | |
| Download: ML19281C781 (2) | |
u t <THis-DOCUMEllT C0tiTAltlS PRELIMINAP.Y NOTIFICATION
-POOR QUAUTY PAGES g
g3g PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURENCE--PNO-III-80135 Page 1 of ?
This preliminary notification constitutes EARLY notice of events of POSSIBLE
~
safety or public interest sionificance. The infonnation presented is as initlally_ rc'cWycd without verification or evaluation and_1s basically all that_is, known by ll staf f as of this date.
Facility:
Coc=ionwealth Edison Company Dreaden Station - Unit "I (Dockat.No. 50-249)
Morris, IL
Subject:
RESUT,TS OF SCRAM TESTTNC FOR TER 80-17 At 0335 hours0.00388 days <br />0.0931 hours <br />5.539021e-4 weeks <br />1.274675e-4 months <br /> (CST) July 19, l'J80, the Unit was manually scrammed from upproximately 5% power to acquire test data required by IER 80-17.
Da tn collected innediately following the scram rese.t at 0336 honra indi cated that water was being held up in one et the scram discharge volumes (sov) and that the presence of water wau not indicated by the nernm instrument volume (SlV) level switch'es. This condition resembled the event which occurred at Brown's Ferry Unit 3 and resulted in Issuance of IEB A0-17.
Immediate followup investigatious indicated that a 1" vacutmi breaker was stuck closed in the vent piping for the SUV portion that had not drained.
The vacuu:n breaker was manually freed and indicutlunu of improved drainage fr::nediately resulted.
It van also determined that an alternate vent path for the SDV was routed to a drain piping syste= that could :-sult in wuLer preventing positive draining. A separate test of SIV level switch repeats-bility resulted in indications that 2 of 4 redundant reactor trip level switches were inopergbje.
At 0632 houra the Red Phone van activated, resulting in the manning of the IEHQ and Region III ReRponse Centera. The 11CCUScC was inforDCd that the affected uutt wou uut to be started i.e until the event was vennivna, and was notified to show cause for continuing nperation of Unit 2.
The matter van thoroughly discussed and evaluated while further shutdown tenting want conducted on the af fected unit.
It was determined that the test procedure whleh ludicated that 2 of 4 eeram leve.1 switches unrc innpernh1c usu apparent ly in error.
Commitmente for modifications in provida pocitiva venting, capability within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> of te.1ephnne notificationn mada on July 19, 1980, were obtained for the affected Unit and for all operating BWR'u.
This modification was completed on Dresden Unit 2 and Unit 3 on July 19,1980 and has been acccmplished or will be accomplished f or all operating EWR's.
Additiona f ly, nn.lu ly 70, 1980, the. atram te.ata were natinfactorily cumpluLed and Unit 3 wau returned to servlee.
Reginn TTI inspnetors ucen nnsite during this event and witnewsed the levtlug results and corrective actions taken by the licensec.
PRELIMINARY NOTIFICATION 80ogogg;tgg
y PRELIMINARY N011FICAT10N PND-111 80 135 Page 2 of 2 This I'N is issued f or inf orm.ition only.
Regional Inupcctors 'will review a:d fo _lowup thi: event in acenrdance with requirements of IEE 80-17.
Neither the iteensec nor Region TTT plan to luvue a press release. The State of 1111nois: ir hai ng nnt.ifled.
This inferr.ation is current nr. of 9:30 a.m.
on July 21, 1980.
k-ContacL:
F. W.'Reimann, 312/932-2558; E. L. Spessard. 312/932-2547; R. F. Ileishman, 312/932-2540 9
e Distributior.:
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Chairman Ahearne Co=nissioner Hendrie
- 5. J. Chilk, SECY Comissioner Gilinsky Coninissioner Bradford C. C. Karme re r, CA ACRS (For Distribution)
Transmitted:,
MNBB P. Bldg.
IE:X005
____(IE:HQ Dist. )
W. J. Dircks, EDO H. R. Denton, NRR C. Nichelson, AEOD R. H. Vollmer, NRP, Landow_
(6 min /page)
J. J. Fouchard, PA R. J. Mattson, NRR J. J. Cumtings, OI A N. M. Haller, MPA D. F. Ross, NRR R. G. Ryan. OSP D. Eisenhut. NRR MAIL H. K. Shepar, ELO S. H. Hanauer ICRinogue. SD IE:X005 Willste Bldg.
Document Ngt. Br. (For PDR/LPDF J. G. Davis, NM55 Regional Offices R. J. Budnitz, RES PRELIMINARY NOTIFICATION