ML20099D125

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Forwards Sargent & Lundy Response to Rev 0 to Observation Rept 32 Re Potential Fault in Class 1E Ac Electrical Sys. Rept Reviewed by Util
ML20099D125
Person / Time
Site: Clinton Constellation icon.png
Issue date: 11/14/1984
From: Victor H
ILLINOIS POWER CO.
To: Parkinson G
BECHTEL GROUP, INC.
References
F-0999, F-999, NUDOCS 8411200208
Download: ML20099D125 (7)


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- CLINTON PoIWR STATICN. P.O. BOX 678. CLINTON, ILLIN015 61727 '

Lv . . November 14.'.1984 i-J .,

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,Mr. Gordon LE Parkinson ~ f-

~-Bechtel Power Corporation' I

Fifty Beale Street San Francisco. CA 94119 L

Dear Mr. Parkinson:

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Enclosed is S&L's response ~.to Observation Report Number 32,.Rev. O.

This response has been reviewed by Illinois Power.

Sincerely yours,-

tj/.! , )

f H. R.' Victor ,

Manager, ,

Nuclear. Station Engineering DW/la ec: ' See Attached Distribution List I

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~ Twx sto-aan.aeoite SLMI-13952 Date: Novembe'r,7,-1984

- Project No.' 4536-51, -53 ._

Illinois Power Company ~ '

'Clinton. Power Station -Unit 1 . '

r Independent Design Review -

= Observation and-Resolution _ Reports' -

Mr. J. D. Geier.

Assistant t6 Vice President Illinois Power Company '

500 South 27th Street Decatur, Illinois 62525

Dear Mr. Geier:

Enclosed is a copy of the_below listed Resolution Reports with the proposed resolution (Items 5 and 6)-completed by Sargent & Lundyr. '

Resolution Reoort No. 32, Rev. O '.x

" , l s' . + i-He for' are also enclosing a copy of the corresponding Observation-Reports completeness.

'Please review our proposed resolution and, if you concur, sign Itemi[ '

of the Resolution Report and forward the report to the independent reviewer.

  • to Sargent Also, please

& Lundy for ourreturn records.a copy of the signed Resolution Reporti '"

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Yours very truly, .h. . t,?iW a . ,j u p,. :%

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R. C. Heider s.

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. #W RCHand Project Mant.ger "

M.'[UflT Attachment - all recipients ' ' ' ' ' ' 'M D. P. Hall ' 'd H. R. Victor E. B. Branch %F%

B. A. Erler F. A. Spangenberg (originals) W. G. Schwartz

.M L. E. Ackmann/W. A. Chittenden L. R. Stensland . I W. G. liegener H. S. Taylor ', ;

E. V. Abraham R. A. Witt R. X. French R. B. Johnson d ' w +1.4 +

J. M. McLaughlin J. ' ' 1, H. M. Sroka M. J. Showski - m.g ..

D. K. Schopfer

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CLINTON POWER STATION-Job 15478-003

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06SERVATION REPORT

' File No. -32

[ O File Revision No.

Date October 22, 1984

1. Level 1 classification of Observation: .

Not significalit to safety . .

T Additional infomation required *See 5, " Recommendation for resolution"'

Significant to safety, send to Level 2 Committee s.

- 2. Structure (s), system (s), or component (s) involved:

Class 1E-ac electrical system

3. Description of Observation:

' FSAR Figure 8.3-6 shows that non-Class IE components are electrically isolated from'the Class 1E system by two acceptable isolation devices for power circuits.

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' (See continuation sheet)

4. Significance of Observation:

There is a potential that a fault in the cynchroscope, which is a '

non-safety related component, could degrade the Class 1E power supply.

5. Recommendation for resolution (optional):

S&L should provide an explanation of why this discrepancy occurred, and an assessment of its safety significance.

S&L should justify the adequacy of the circuit design to meet the design requirement.

6. Signatures: ,m e Ie/t 1//F RA RL

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CLINTON POWER STATION

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' OBSERVATION REPORT .

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. File No. 32 File Revision No. U Date October ZZ,1954

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3. During manual operator action when transferring from the diesel'

- generator (onsite source) back to an offsite source, a synchroscope -

which -is a non-Class 1E device will be connected to the Class 1E

. system. The synchroscope circuit is_ isolated from the Class 1E system by only one fuse.

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RESOLUTION REPORTL .

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32:

l File Revision No. 0

'Date October 22, 1 W .

11. . l Resolution by Level -1 Internal Review Connittee f

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2. Classification of Observation:
a. Not valid-(see continuation' sheet)-

- b. Not significant to safety

- c.T Additional information required

d. Significant to safety
3. Program resolution is:
a. Closed item .

b..'lAction to be' taken by Reviewee

4. Review Committee signatures:

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5. Reviewee proposed solution:  ;
a. Description of proposed resolution:

(See Continuation Sheet)

b. Basis of proposed resolution:

(See Continuation Sheet) 6.- Reviewee response report signed byLt/ Y.& Engineer /, Iil6l84 uate / W 0, d.0.0 nanager u - yt oate.k  !

7. Illinois Power Co. Review : '

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The'ob'servation' described in!SectionI3/is not'a-' discrepancy and? there? 7 fore, has no; safety. significance.- -

                                                                                                                                         .7 Synchroscope -circuits                                                                                    are:;not considered to be .nower cir,cuits.: Thev.>
                                'are infornation circuits:and,.as such,:.are^ connected to their re-fsoective c1'assDIE circuits;in'accordance with:the rectuirenants;for.

associated information circuits Lin 5'SAR: Figure 8._3-6._. The Ja,vnchroscope circuihin norr' ally di-energizedi l't .is Joneraised : ~

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      -n            *           ' bv ioneratori actiori which occurs infrecuentiv -on only one divisiorr at a ;
' time".7 . In
the event .of 'a' fault in theisvnch' roscone;' analvsin 'shdws
  • the Class 1E fuse for th's svnchroscone' circuit will interru'nt the circuit. prior to the openiner ofitheruostream. Class lE PT fuse thereby r L isolating the Class::1E system' from the 'faulti l -

Since th& un.th's likelysynchroscope failure of the of Class oniv.lE one synchroscope Edivision is operated fuse to interruet at a tine', *

            <..'                      a'f.ault would result in no(connon mode failure..                                                -
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                                                                                         !y_0999 L40-84(11-14)-L-8C;150b' c.-

Clinton Power Station : i  : Independent Design Review k' s

                                                      ' Standard Distribution' List Director'of Nuclear Reactor Regulation                     Richard J. Goddard, Esq.

Aten T .UA.jtehusacer6 Chief" J office'of the Legal Director. Licensing ~ Branch No. 2 U. S. Nuclear Regulatory Cosmaission Division of. Licensing Washington, D.C.. 20555

11. S. Nuclear Regu12 tory Commission-
                 . Waahington,~D.C. 20555~                                     Don Ecchison Director, Illinois Department of James C. Keppler.                                               Nuclear Safety-
                 - Regional Administrator                                       1035 Outer Park Drive'
                 - Regim III             .

Springfield, Illinois-L62704

                  .U.-S. Nuclear Regulatory Commission 799 Roosevelt Road                                       . Allen Samelson, Esq.

Glen Ellyn, Illinois ' 60137 J . Assistant Attorney General ' Environmental Control Division Byron Siegel. Southern Region-Clinton Licensing Project Manager - .500 South Second Street Mail Code 416 Springfield,-Illinois 62706

                  .U. S. Nuclear Regulatory Commission Washington, D.C. 20555       *-
                                                                             . Jean ~Foy Spokesperson, Prairie A111anco Fred Christianson                                          511 W. Nevada Hail Code V-690                                            Urbana. Illinois 61801 NRC Resident Office Clinton Power Station                                      Richard Hubbard-R.R. #3, Box 228                                           MHB Technical Associates Clinton'. Illinois 61727                                     1723 Hamilton Avenue Suite K James L. Milhoan                                           San Jose, California 95125 Section Chief, Licensing Section                                              .

Quality Assurance' Branch Gordon L. Parkinson Office of Inspection and Enforcement Bechtel Power Corporation Mail Stop EWS - 305A Fifty Beal Street U. S. Nuclear Regulatory Commission P. O. Box 3965 Washington, D.C. 20555 San Francisco, California 94119 Richard C. Knop Roger Heider Section Chief Sargent & Lundy Engineers

                  . Projects Section 1-C                                        55 East Monroe Street U. S. Nuclear Regulatory Commission                        Chicago, Illinois 60603 799 Roosevelt Road                                                                                     i Clan E11yn . Illinois 60137 e

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