ML19259D267
| ML19259D267 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 10/03/1979 |
| From: | Boyd D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| References | |
| PNO-III-79-009A, PNO-III-79-9A, TAC-12237, NUDOCS 7910170528 | |
| Download: ML19259D267 (2) | |
Text
V PFILIMINARY NOTIFICATION D.s t e :
October 3, 1979 FRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURFINCE--PND-III-79-09A
'This preliminary _metification canotituteo EAnLY notice of evcut. of P000ILII.
cafety or public intercst signi fi ca nce.
The inf orniation precented is as 2nitially received without verification or evaluation and i, basically all that is kncvn, by,1,E s ta f f on thi s date.
F.,rility:
Wrthern Srarer. Power Cnepany Prairic Island, Unit 1 (DN-50-282)
Red Wing. Minnesota
Subject:
TUBE El~PTl'RE IN STEAM GENERATOR A 8 '
$1 Val itis ic an update of PN-tit-79-09.
W licanmee notified the NRC (via the Red Phone) at 2:33 p.rt, on October 2, 19/9, that a :s t ea n genetaLot Lubc(3) had ruptured at 2: 24 p.t:. or. October 2, 1979, whien inititted n reactor trip / turbine trip and natcry injcetion due to low Reactor Coa l ;m t c.vwtrm prexxure (x hou t.
1S00 psig).
All Saf ely SV3 tC0JG [unctioGCd GOrr.311y.
Pill.- 2 e,
ove r.4 t ing sL power al the tice of this event and was unatteeted by this etent.
Inc renctor ennlimt p ufp t, w re tunually tripped, i mediate.ly in11cuint, the c.atcry Tnjection (S.t.) initiation as required by procedure.
One at ausphe ric _
r e l i e. t valve en the 'A' s tcc:: generator opened momentarily (1-2 secondn) At the tirc of the turbine trip.
During the teduction of prinary sysran prcssure, a rever operated relic 5 valve was intentinnally opene.d %r a short pe.riod of ri..
T5n Pir. charge or steam threunh thi, valve into a drcin Lank incide cent 31r ent cauced a ruptura disk to open.
A 4.411 A-annr or radicactive Catcrial wuu released Lu the containmant building through the opened rupture disk.
The amount of radioactivi ty in th-contnin.e.nr building is r all.
C:ntset:
i 3
I 6./_
/_. b Distri:LtiCn:
TTMDEmitlPd N bl Cta :uu livadrie Ce=issiener 31sdferd S. J. Chilk, SECY Co :issicuer Kct nedy Concissiener Ahearne C. C. Ka merer, CA Cc=ir riener Gilinsky ACRS (For Distribution)
Transcitted:
MN33 P. Bldr IE:X005 (IE: !!Q Dist.
L. V. Gossit}., EDO H. R. Denten, NRR H. L. Ornsteir., EDO R. C. DcYoung, NRR J. J. Fouchard, PA R. J. Mattson, NRR Landow (6 min /page)
N. M. Haller, MPA D. Va::: allo, NER J. J. Cun=iny,s, OI A R. G. Ryan, OSP I]. Eisenhut., NRR H. E. Shapar, ELD JS Bldg (MAIL).
SD W. J. Dirchs. NMSS R. Minogue, S. Levine, EF.S IE:XOOS 7910170 2
PISLIMINARY NOIIFICATION
P.N-111-7 9-09 A Cecidtra was accorp11shed initially by enturni circulation t hrn:rgh t he E stenn ger:er stor and later one reactor conlant pump was rentArred to facilitate the cocido.t.
The secondary side of the 'A' steam generator was isolated and the pr. nary and secondary pressurew were equalized to miniteize the le nkq;e frv= the primary tyule= into the secundary uyutcm.
These precourus were unintained essentia_Ily equal during the cooldown.
Cooidown is being ec=pleted using the residual heat removal sys teta.
The p3 Ant vill retain down penaling thn completion of steam generator tube c.sc ination and repair.
According to licensee surveys, the iniriAl releases from thC reactor building stauk were approxicstely 10 percent of the Technical Specification limit and thne releases dropped within one hour to less than crue percent of the limi t.
Of f-site environmental es=ple teams from the plant and the Stares or Minnesota and Wiscencin round no of f-cite _ centamination.
Le 'III e.nergency response. cenrer was activated it nediately upon notification et the incident and han been :.anned on a continuous basis.
The Prairie It and controlrocs was continously mannod, initially by tha site resident inspector and then by members o f the RTTT site tenrr..
(Tn.w. arrived on site at 6:50 p : )
Ins,,ectina findinga by the f:ite rcam and resident inspector indicated that the li c e n s.e s-achered in emargency procedures during the event, that Technical Speificarinns T.initing Conditions f or Operations were adhered to, and
'.b t releases were less than Technical Specification li itc.
RIII noti fied the U. S. Environcrata] protection Agency, U. S.
Food and Drug Administration and ci e States, of Minnesota and Wisconsin.
The office of the Governor of the State of Minnesota was also nulified.
The State of Wiccencin was al:'.o cen: Acted.
he licenxee and the NRC I>o<ned news r e.l e a s e s.
Therc was censiderable =edia interest.
The licenvee held a press conference from 6:00 p.m.
to 8:00 p.n. on 10/2/~C.
'1hi; infu1=tivu is current as of 8:00 a.
- r.. Octmer 1, 19/9.
/
j.Y RTTT((~.j.
MII C w art:
D.
C.
Eovd D.
C. Boy Prepared by.
Acting Branch Chief 3S7-934A U 7 - 9 V. 8 J
a 1162 267