ML19322C482
| ML19322C482 | |
| Person / Time | |
|---|---|
| Site: | Crane, Davis Besse  |
| Issue date: | 09/26/1977 |
| From: | Klinger G, Nolan F, Sniezek J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| TASK-TF, TASK-TMR PNO-77-171, NUDOCS 8001170811 | |
| Download: ML19322C482 (1) | |
Text
,
~
h}N fl g
Se c:en:o er M
. 5.' 7 Poet.II:! U.TJ HCTIFICATIC': OF EVENT 02 UWISUAL OCCUbiEhtE-.r; : ;' '. 7 i
'rary netji, cation co is tituW. EARLY irtice of r.. W tt ci h -..
This c r-
~ p y c.
- r. 3.ot.6 er cub: 1c inter,es.t sienliicci:cc.. The inir,r: nien
'presea.ec is as inntaily receyveo vrithou..,.
K. yy,.g ver'ricatier. or ?vai m ;cn w
na3i..a11y_ all that is known by IE staf f on this dar.a.
3r : ::
s ?xagg n.
- p. zm' *8 Toledo Edison Ccmpany,)Cavis-Besse Unit flo.1
'" va :~:11o Facility:
D ICtl 50-346), Port Clinton,'0H
~
R.
tdse Wo
< TOSS OF REACTOR COOLAi;T. PRESSURE: 0UE,Td FAILURE?O: f.' *Vh*lt 5tdjec::
- PRESSURIZER POWER OPERATED RELIEF VALVEi F
2 Davis Ocsse.
SEPT 9M,\\9T7 T:leds I:ison Ccmpany reported to,RIII (Chicago) that the Davis-Cas..:
4
.'- 1 r.nctor coolant 5ystem was: decressurizedyTrcm 2165 psig to 37.1
~
., psigM ~5eptember 24,747.' at aaproximtelyf 9:35 p.m. yher, en 'altete -
s t pneum 4ticLpressurizer' r'elfef Valve failed to c. losa afte. r actation.
The reactor vas c;erating at approximately 9" of rcted p:N e r w h.en.an
- 3? error problem caused a (feedwater pump +.urbine' runbace..
- he.
ucaren:
steam #sedyater rupture. ccntrol_ systax actuatefan log 3(een gerledater levellciosing the rain steam. isolation valves.
The;presurizatr sicctrol pneusatid relief Valva 'cperated ' automatically to relieve' the 'reiul-s;
~
i pt esidre' incr' ease; h'cweve", 'thi valvelf tiled to clos ~e c.f ter riliev'ne the pressura surga..thereby depressurizing'the' primary' system.
~
- u.,....,
The.cperat:; mh.ually;scramedl the reactor.
'thila.all safety reioted systems functioned properiy following tne scran. the inabili y.to.close, (disc ;(relief valve discr.arges to prestri:a.Odench-tank)'. '. t. -k rustu the_pressurf:er relief valve resulted in!blcwing the quench *g5;se n t e
dcage -is cenFr.ed to ~a crac'xed ventilaticn duct and the i!c. 2 steem Gene.7atcr ic.suitticn.
There were..o releasas of radioactivity to the environment and no persenai injuries cccurred as a result of the event.
The licensee es-iriates.the reactor will be shut down two weeks to repair the dcmage.
Aa 'lli! Ins;cctor is'being dispatched to the site.
T.5e licerisee has issued a press release.
Region III also pians tc issue a press release.
The State of Ohio has been ir.forr.>2d of the occurrence.
RIII (Chicago) received notification of this occurrence by telephone at 8:45 a.m. on September 25, 1977, from the Plant Superintendant.
Contact:
GKlingler IE x28019 Riolan, IE x28019 JSaierek,.IE x23319 Y
Distribution:
Transmitted fi St 2',9 j
Chaim.an i;endric Comis, inner 3radford i
s Comissioner Kenhedy S. J. Chilk, SECY '
C. C. Fa.ve-er, C Co.missiorer Gilinsky (For 3incib; ic,:)
Tran:M t ted; P.NBB 3d P Bldg 2.', Y C. Vciger.1u, IE L. V. Gossick, EDO E. G. Case, NRR
. D g i o n,,,.,,,,,
S. H. Innauer, ECO J. J. Fcuchard, PA SS Bldg (F;'-)
iPS5 F. 1 !MT'ern3.n, f.iA C.,..V.
Smith,h{b
'J. G. I'c0cnald, MIPC Mog E. p,.gu+. si) ydQjM/rb
- h. K. Shepar, ELD k !,d. 5
.. G. i!yan, OSP g
h 8001170 N/I J
J