ML20084D733
| ML20084D733 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 12/18/1970 |
| From: | Hoyt H COMMONWEALTH EDISON CO. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084D725 | List: |
| References | |
| 04984, 4984, NUDOCS 8304120305 | |
| Download: ML20084D733 (2) | |
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ONC F1RST NATRONAL PLAZA
- CHICAGO. ILLINOl3 AEtess Keply 10.
POST OFFICE BOX 767
- C H I C A G O, ILLINOl$ 60690 Dresden Uuelear Po'.e
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December 10, 1970
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- i., ta ra;. or on'iti.on relatins to t:te operation of tha s ta t a
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.:le s. t roua t ic _ :11<. valve 2-203-3C (2C) f a iling to open duri-u r u..al re t of one electroca-ic reitef valves s e rv an:; the aute..atic Llet.oun s..
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C' r liet valvt f a ile to ope
.: uria > nanual n:o ation
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all ot hers <:p e ca te.!
satisfactoril.. At b : u.; a. t :.
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nn ;f 23 dropped to 3GO ;;,2 co Tio paig.
T1.e JPCI turbina wa p 2t v tu na..,
ar a:. S:,J a.
. m pet pa ra tion for sut veilla :ce tearine.
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revealed that a cottar Aa insp a :t i ca o+'
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In ia 20tmer
'ta had b.zu Enttalleu as part of s c.
tiu re g te a jus; raat iade o:.
< taber 1, 1970 a; reported in c.L.
lettir of October 9.
c,m cattoa ca r rc r i t olle.cing repair ou Novemiwr 19, 1970 rt, a l t. of this failure and several other failures previo uly re ported, d'.ri.
, me con ent catage which began on December 7, a complete revlev of the pro-bio and all po;aible causes of the probleus was made, and appropriale corrections made as follows:
- t 8304120305 710113
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i PDR ADOCK 05000237 r
S PDR I. COPY SENT REGION _
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,t DEC 2 8 1970 ' " "
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Dr. Peter A. Morris December 18, 1970 J
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P i i.o t valve travel adjustments were reviewed and correct settings of 3/16" to 7/j2" as cade ca 11/14-1d/70 outage were verified correct.
The operating linkage l
clearance was checLed ca 11/1/-13/70 so that the linkage and pilots were all f ree to rove the full pilot travel. Also on 11/14-18/70 the guide post wear was checked.
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A new soleaoid kit was installed to correct the solenoid guide post wear pro-e u lc.ma reported in our letter of October 9, 1970.
The hit replaces the hollow r,u id e Eoat with u solid utt.inless steel post.
The solenoid armature guide pla h j
is replacea uitn one having bronac bushings about 1/2" loni; to eliminate wear on the guide poJt.
'lue cottec pins which previously existed to retain the arcature Luida plate have been climinaced.
The strike roller which actuates the pilot l
valve. ope ra ting leve. nou also acts as the upper limit stop for the araature.
3.
.. au n ch v.hica ee-ene rt;ine s the armature closing coil at the full extended poa-itiva ua; found on the "C" valve to occasionally stick in its de-energizing posi-l
"'ua t;hich could have caused a calfunction.
Clearances were increased to avoid tais possibility on all valve pilot solenoids.
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It is now causidered that appropriate corrections have been unde to elim-
'nate previuua problems Vaich.: ave been experienced and tha t the valves should
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Le dependable for subsequent operation.
i All the valves will be functionally tested Juring startup to assure operab-
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ility following the above noted maintenance on valve co:aponents.
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