ML20084T760
| ML20084T760 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 09/20/1972 |
| From: | Worden W COMMONWEALTH EDISON CO. |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084T764 | List: |
| References | |
| NUDOCS 8306240093 | |
| Download: ML20084T760 (2) | |
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i-19. /s. Glar u n. so itput y Direc oc for teactor Project a D ir e c t ora t " of Lic-nairc' II.
S. 4t onic s:nergy Cco nir,sion Washiv, tea, D.
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1 Daa r Iir. '_ iambun so:
Thic O to r:ncrt a cradi+ica relatiny to the operatica of t he station in phien a react or protect ion spta (hfS) lir; t t r., It ch on t h e i4 turbir,e cont roi valve un found tu S 2 inoperale, contrary to the require-r ats of Section 3.1 of the Techni.ca l Specif:.ca tiens.
I P!:0HL"" M?D Ji'WSTTrATID'1 The,. reactor uc, in the "run" rodo and operatinr,at 560 IMc on Scpte
- r 9, 1972
'. t 0:00, dit t ha Turbine Paekly Checks,Y vas noted that the turbine p,euerator load uia ".t ch relay (590-121D) scran ca Channel "II" did not deenergine unen the 24 control valve vas closed. When the control valv' inst c i c <.; u r e seloncid operates, it actuates a switch which opens contacts de-energinit,its El' m relay; this caucca a Channel "B"
trip when above 40% power.
1'ending cor rection of the problem, fuee No. 590-72511
, 'h wa s t enoved to act uate c Chanael
'T," acran to natisfy the requirements of Section 3.1 ef the Technical snecificaticus.
ya I nve s t i m t ion of th > swit ch showd tbv the mount ire b.ol.t.s had.
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uniked loe;c.illowinn the witca te hift far encugh so that it could not-he il Tiiun ed b: t he fm,t closure aoleaaie.
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,+od. ' m. : 2 cc, nnd t ect ed sa tisf actorily.
.si r s.o on the ot her thteo ecm.riu va l.ves u re similarly inspected Tho 1:
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0 o F, ',d 8306240093 720920
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,5 1:r. A. Gianbus so September 20, 1972 4e ti hoc)N f
A siullar occm rence un s experfonced on July 7, 1972 as e::plained in the let.ter to 1;r. Eloc, f rn:a Mr. 'Toz len dat ed July 17, 1972.
The correct ive action at that tr..e was to rever::e t i.:_ rc.unt inr, belt,
f'ecause of plant co: iLtions at tt ;t u2
- e.. i. one of t i. ' _ limit s.titcies had the neunt roversed.
During the cu:r<mt a nmca ly, ti:e bolt s uct e adjusted and tightened.
Darin;; tt.e n :t ra u.t ennoce car n'e, the limit
> itch r:cuntin; belt s will be icversei a r '. deable nut.-
installec.
This corrective a tica 1.as already been completed ca Unit 2.
l Sincerely,
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U. P. Worden Superintendent UF1:do
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