ML19322C448
| ML19322C448 | |
| Person / Time | |
|---|---|
| Site: | Crane, Davis Besse  |
| Issue date: | 09/30/1977 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Jeffery Grant TOLEDO EDISON CO. |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001170617 | |
| Download: ML19322C448 (2) | |
Text
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SEP 3 01977 i
l Docket Fo. 50-346 l
Toledo Edison Company ATIN:
Mr. James S. Grant
@g$ ggg Vice President - Energy Supply
$dPT M,19If.
Edison Plaza 300 Madison Avenue Toledo, OH 43652 Centleuent
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s This. refers. to the'. telephone eenversations;between you andeMr. Evans) r jof i sepyour staff and Hesero. Fiore111' and Knop 1of this officejoa~regardingfcor
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tember 29, 1977, "the~ depre'ssurizapion, event. occurring ~at' th'e Davis-Besse Unit 1
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FuclearPlantoniSept, ember,24,;1977.;
As discussed during our conversation with you on September 29, 1977, we understand that you wiil 1.
Evaluate the actuation of the steam, feedwater rupture control 5 ystem and. determine what corrective actions must be taken to s
improve reliabilityjof this system during future operation.
5 EOsliste"t5e cooldowd of the primary system and determine that 2.
' resultiing 'stressei'i the piping and/or vessels were within n
acceptable limits.
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Evoluete 'the press,ere escursi,on:in the primary system to determine that th's transient,iincluding boiling.effsets, did not[cause; 7; damage toLthe ' primary systemi to the reactor vessel or it's i
l internal Fonhonent's'or"to the reactor fuel.
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1 Determine why theistiaas generator wee esptied, and evaluate the i
short and long-tea effects of the transi.ent.on steam generator 2 to determine tt at there iteranno ezeesolve,etresse.ejcaused by j
primary to secondary pressure differential, thermal shock or by allowing the stessi generatorJ.o go dry.
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, Review. ell,available, data and; determine what equipment 'did moti f
tfee'ettee eefdeelsmed. For equipment so identified,' deidraine the cause of the failure and steps to preclude future failure.
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I W u. a. oovsanuswr enownw. orrscs. ser.-.aus4 NRC PORM 31s (9-76) NRCM 0240 r
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8001170 J
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9 Toledo Edison Co. par.y SEP 3 0197T i
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Feep Region III office informed in a timely c:anner as s11 the t
reviews and corrective actions are being accomplished so that we can evaluate the effectiveneas of your corrective actions.
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Ve understand that the above vill be completed prior to the plant i
going into Mode 4 (Hot shutdown) nparation.
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Plestie inform us inmediately if your understanding of these items j
is different from that stated above.
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sincerely, 1
I James C. Keppler e
Director e
l cct Mr. J. Evans, Station Superintendent
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1 Central Files
- j Reproduction Unit NRC 20b PDR t
Local PDR NSIC TIC D. Young Park, Power Siting Company V. P. Ellis, FC&EB, IE Lana Cobb, Plans and Analyses. IE 1
IMM,EDIATE ACTION LET'En RlII k,, r.c s *
, RIII RIII f.
Knop /1sh. Fiore11i Ke er 9/29/77 3
I NaC PORM SIS (M6) NRCM s240
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