ML20099D125

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
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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I-liLL N018 POWER COMPANY l

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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

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~-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,-

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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

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i-He are also enclosing a copy of the corresponding Observation-Reports for' completeness.

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

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

Also, please return a copy of the signed Resolution Reporti '"

to Sargent & Lundy for our records.

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Yours very truly,

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'd R. C. Heider

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. #W RCHand Project Mant.ger M.'[UflT Attachment - all recipients

' ' ' ' ' ' 'M D. P. Hall

' 'd E. B. Branch H. R. Victor

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B. A. Erler F. A. Spangenberg (originals)

W. G. Schwartz

.M L. E. Ackmann/W. A. Chittenden L. R. Stensland W. G. liegener H. S. Taylor E. V. Abraham R. A. Witt R. X. French d ' w +1.4 +

R. B. Johnson J.

' ' 1, J. M. McLaughlin M. J. Showski H. M. Sroka

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CLINTON POWER STATION-Job 15478-003

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06SERVATION REPORT File No.

-32

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File Revision No.

O 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.

(See continuation sheet)

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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:

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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 3.

During manual operator action when transferring from the diesel'

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

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

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

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RESOLUTION REPORTL g

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32:

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'Date October 22, 1 W

11.. l Resolution by Level

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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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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.& Iil6l84 /, uate / Engineer W 0, d.0.0 oate.k yt u nanager V p /,j/ ff 7. Illinois Power Co. Review : untej /. 0282C

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CLINTON POWER: STAT!0N3 1:* ^

2 ^ 2 l Job 15418-003:* s. o,, . (RESoliTTION REPORT s. 1+ 4 s (continuation - sheet) t z.i c . -s w e m' File Wo.' 32' O x< L. ~ File Revision:No.='0 ,s L.1

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10 ate october 22.194: ~ n - n 1 n. 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 : ' bv ioneratori actiori which occurs infrecuentiv -on only one divisiorr at a ; ~ ~ -n ' time".7. In : the event.of 'a' fault in theisvnch' oscone;' analvsin 'shdws r

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

• a'f.ault would result in no(connon mode failure..

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Independent Design Review k'

' Standard Distribution' List s 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 Clan E11yn. Illinois 60137 e L-}}