ML17193A104
| ML17193A104 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities  |
| Issue date: | 09/24/1980 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Abel J COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8010090240 | |
| Download: ML17193A104 (3) | |
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REGU.LATDRY. DOCl<El-AtE -c.OPl.*.
, Docket Nos. 5*0.. 237 50-249 50-254 and so.:.265 Mr. J. *s. Abel Director* of Nucle~r L 1censii1.g
- Cormionwealth Edison*Company P. o *. Box 767.
,Chicago. Illi.nois* 60699
Dear Mr. Abel:
. SEPTEMBER 2 4* 1980
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By our letter. dated August 7, f978, -we inforrr.ed. y*ou of-'defic1encies we identified in the *des_ign.. :of the Hatch 2 regul<itor system*for the{;
motor 9e.nerator (M-G) sets whic.h s*upply '.power to the reactor protect ton syst~m (RPS).' I'n general; the problem involved the possibility *of t.he M~G producing power which* was of a quality {Hi gh/1 ow outage~ etc.)
that could be outside* t.hat for which the RPS has been de.monstrated to be acccp~ab 1 e *. Speci fi ca 11~, ~he d,efi ci enci;~s.i nvo 1 ved:
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{l) Potential seqtience of undete~ted sfngl~ component failures. whid1 cou 1 d adversely affect. the operabil,j ty of the RP s; and (2)
Postulated *componen*~.nialfl!rictions. initiated by ~csefsmic event
- which could.adversely affect the operqbi Uty of *the RPS.
Our 1 etter
- reqvested that you re'vi s-f your Rf>iS *power,supply to determine if your system wa:s :suscept 1b1 e :to t.he sa~. adverse poss ibil it i e.s that the st~ff had identif1ed for Hatch'*~. * -.
- We have completed our "revJe1 of. your r~~pon*se *tO ~µr request 'and have. -/()'
determined that the. pawer supply. RPS design at your faci 11\\:y Js such
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that it could experience the same *a~vers~ co.nditions.. as described above'. -
Accordingly. we have determined that modifitations should *be performed to provide fully redundant Class 1E prote.ction at *the interface.. of* tfre *
- non-Class lE. power supplies and the RPS.
'We believe that.the*use 'of-alarms or shift surveillance is acceptable as qn interim measure but
- is not adequate for the Jong-term solution :of our concerns.
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We--:hfrve-ftumi-=t-:hat-th<lt~cep.tu.al.,-Aes tgn_ propQs*ed:.fil'_ th~_Genera 1.E1.ectri c *
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- le t io... on-Hafch~:-1-a.r.~;.::~cc~. fifi:'f e-=* '-~ __ -: - * -
. SURNAME
........... 8-01*.090.. '2: *....:**.*.... :.... *.:..... :....... *.,.. :.... :..........,.'........... :..........'....
DATE~...,,...,,,......... :.....,.._...... *:......... *.. *.... :............
NR.C FORM 318 (9-76) NRCM 0240',
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-,. Nr. J *. s. Ab.el
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In* view of* the. above~ we be 1 i eve that* you should. m~dffy. the p9wer. supply for the RPS at your facility. This* modification.. should* be implemented
. by the end qf the next refu.eling ou:tage.
Should this schedUled outage
- occur within the next *six months, the modifications should. be accornplish~d by the end of** the subsequent refueling: outage.
- We w1 l1 perform a: post-imp 1ementat1<:>n review of your rTiOdi ft_ca~i on *an(f. will require ~ppropri ate
" Technical Sp~c1fications.for:- the $YSt~m. *...
We request'.that_you.Provi9e.t.~1thin.60 days of your rece.ipt of:this.
'letter: your Cl) commitment to install* a Class **1E system, {2) schedule for completion of the modification arid (3) schedule for'.submiss1cin of design information and pr.oposed*Techr;iical Specificatfons~
cc:
See next page Distribution Docket ORB #2, NRR Reading
,Glainas Tippolito
- SNorri s *
. OELD IE ( 3)
ACRS ( 16)
NSIC TERA JRoe RPurple
. J He 1 temes, AEOD
.DVerrelli.
RBevan
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- Si ncerely,
- . Orig\\na1 signed by Thomas A *.Ippolito, Chief
.-Operating Reactors Branch *1;2 Division of Licensin~
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.NRC>FORM 318 (9-76) NRCM 0240
. : *u.s. GOVERNMENT PRINTING OFFICE: 1979-2B9-369
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iy_.0 Mr. J. S. Abel cc:
Mr. D. R. Stichnoth President Iowa-Illinois Gas and Electric Company 206 East Second Avenue Davenport, Iowa 52801 Mr. John W. Rowe Isham, Lincoln & Beale Counselors at Law One First National Plaza, 42nd Floor Chicago, Illinois 60603 Mr. Nick Kalivianakas Plant Superintendent Quad Cities Nuclear Power Station 22710 - 206th Avenue - North Cordova, Illinois 61242 U. S.,Nuclear Regulatory Commission Resident Inspector's Office Dresden Station RR #1
- Morris, Illinois 60450
- Moline Public Library 504 - 17th Street Moline, Illinois 61265 Susan N. Sekuler Assistant Attorney General Environmental Control Division l88 W. Randolph Street Suite 2315 Chitago, Illinoi~ 60601 Mr. N.
Chri~sotimos, Inspector U.S: Nuclear Regulatory Commission Box 756 Bettendorf, Iowa 52722 Mr. B. B. Stephenson
'Plant Superintendent Dresden Nuclear:Ppwet Station RR #1 Mor~is, Illihois 60450
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