ML17173A764
| ML17173A764 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities  |
| Issue date: | 04/16/1979 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| IEB-78-03, IEB-78-3, NUDOCS 7905030067 | |
| Download: ML17173A764 (4) | |
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APRIL Mr~ Cordell Reed Assistant Vice PrE~s*hkmt Co;;:rnomma 1th-Edi son Company P ~ '0~ iSox 767 Chicago~ 111 im:ds 60690 1 6 1979 Distribution
~Docket ORB #3 ORB #2 NRR Reading Local* PDR NRC 'Pon
+men ton
\\!Stello BGrimes DEisenhut
- Rvollmer TJCarter HRussell Tippo"lito RBevan SSheppard HSmith PO'Connor DZierriann
/\\,tty, OELD
- U,£ {3)
- ), bu11etjn titled Pot.cntfo.l E.xp1osivt~ GDS }lixtures t;ccur:.ulations P1ssu-cn::i.ted 1:1ith mm Offgas Systcn Oper~tions was sent to a11 operatin~J m-m licensees.
T0fop!mrre cti11s ue.=:re subsequently ~l:c.de to s8WH"Zd _1ic~nsecs to as:~urc final rosolutfon of our conccirns r2gardfon potcnti.:il explosive gas mixtures.
The i~nclos1.rr2 Jocrn<;t:mts Otff' i.mderstanditi9 of te1cph~/ne conv~l"Sations t.)n March 2, *1S and 22~ 1979~ b~tt;ieer; the NRG staff, our consultJ.nt (f~11"Jed Chadcai Ccw1pnny - Idaho Chemical Prograr.1) and your staff concerning I&E Bulletin 78-03.
If yriu ho.vi: any questions cm this subject r;r UH~ enclosure,, please contact rtoby ~,evan.,
Enc1osurH:
notes of C-0nferencc Co.11s to Coi;ir:mrn:;ea 1th* Ed"ison Co.
Concerning l~E 6ulletin 78 Dresden-Station and Quad Cities Stnt1ori S-fncerely $
Original Signed bJ:
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- Ip po 1 i to., Chief Operating ~~eactots Branch iJ'J Div"ision of Operating Reactm*s Ol'FICS~
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Niu: FORM 31~ (9-76) NRO! 0240
'* u.o. GOVf<RNM"NT PRINTING OFFICE: 1971 **** - 700
Mr. Cordell Reed cc Mr. D. R. Stichnoth President Iowa-Illiriois Gas and Electric Company 206 East Second Avenue Davenport, Iowa 52801 Mr. John W. Rowe Isham, Lincoln & Beale Counselors at Law : One First National Pl.aza, 42nd Floor Chicago, Illinois 60603 Mr. Nick Kalivianakas Plant Superintendent Quad-Cities Nuclear Power Station 22710 - 206th Avenue - North Cordova, Illinois 61242 Anthony Z. Reisman Natural Resources Defense Council 917 15th Street, N. W.
Washington, D. C.
20005 Moline Public Library 504 - 17th Street Moline, Illinois 61265 Susan N. Sekuler Assistant Attorney General Environmental Control Division 188 W. Randolph Street Suite 2315 Chicago, Illinois 60601 Mr.. B. B. Stephensen Plant Superintendent Dresden Nuclear Power Station Rural Route #1 Morris, Illinois 60450 Morris Public Library 604 Liberty Street Morris, Illinois 60451 JilTillly L. Barker Nuclear Regulatory Commission P. 0. Box:.706 Morris, I;Ulinois 60450
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Attachment l NOTES ON CONFERENCE CALLS TO COMMONWEALTH EDISON ON DRESDEN STATION UNITS 1, 2, & 3 - QUAD CITIES STATION UNITS l & 2 Call on 2/15/79 between Hal Gustin, Cognizant Engineer and Joe Keller, ACC~ICP.
Call on 3/2/79 between Bob Janecek, Nuclear Licensing Department; Hal Gustin, and John McDonald, Station Nuclear Engineeing Department; Greg Rymer and Dick Traxler, Dresden Station; Ronnie Lo, DOR/EEB; and Joe Keller, ACC-ICP.
Call on 3/23/79 between Bob Janecek, Hal Gustin, Ronnie Lo and Joe Keller.
Based on the information transmitted during the referenced conference calls, it is our understanding that the Commonwealth Edison Stations have the following features:.
Dresden Unit
- l. Prior to the end of the current outage, the rupture disc in the ~jstem will be backed by an in-series relief valve.
The relief valve will vent to the air ejector room which has a design ventilation flow of 300 scfm.
- 2.
Procedures exist which prohibit bypassing the recombiner.
- 3.
The drain in the exhaust end of the delay line is piped from the low
- point in the delay line to a drain tank which vents back to the delay lin~.
Dresden Units 2 & 3
- l. The rupture discs were to be backed by in-series relief valves, but it has now been decided to install bl ind flanges in place of the rupture discs.
The installation will occur in Unit 2 during the March 1979 refueling outage and in Unit 3 during the spring 1980 refueling outage.
- 2.
Procedures exist which allow bypassing the recombiners only during an emergency.
.e 3.
The solenoid valves on the drain lines which contain loop seals (from the delay line and HEPA filters) are closed on a high radiation alarm in ~he delay line.
- 4. The plant procedures will be modified to close the valves in item 3 im-mediately following a pre'ssu~e transient in.. the off-gas system caused by an in-ternal detonation or burn.
These valves will be reopened only after ~erification that the loop seals are intact.
The changes will be made by Jurie l, 1979.
Quad Cities Units l & 2
- 1.
The plant has committed to modify the rupture discs in the air ejector rooms.
The decision on what type of modification has not been made but either blind flanges or in-series relief valves will be installed.
The modifications will occur during the next regularly scheduled refueling outages at each Unit.
These outages are currently scheduled for the fall of 1979 for Unit 2 and the fall of 1980 for Unit 1.
- 2.
The recombi~er section can be bypassed.
- 3.
The solenoid valves on the drain lines which contain loop seals (from the delay line and the HEPA filters) are closed on a high radiation alarm in the delay line.
- 4.
The plant proc~durei will be modified to close the valves in item 3 im-mediately following a pressure transient in the offgas system caused by an in-ternal detonation or burn.
These valves will be reopened only after verification that the loop seals are intact.
The changes will be made by June 1, 1979.