ML17173A995
| ML17173A995 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, Zion  |
| Issue date: | 07/02/1979 |
| From: | Hannon J Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| TASK-06-04, TASK-6-4, TASK-RR NUDOCS 7907260031 | |
| Download: ML17173A995 (4) | |
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JULY 2
mg Dockets Nos._ 50-10, ~
50-249, 50-295,
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50-304,~,
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- . c06monwealth Edison Company
. FACILITIES:
D:esden l, 2 and 3; Zion 1: and 2; Quad Cities 1 and 2
SUMMARY
OF. MEETI~G HELD ON ~JUNE 28, 1979 * :
A meeting was -held with representatives of Common\\.;ealth Edison Company (CECo) in-l:lethesda, Maryland on June 28, 1979.
The purpose of the
- meeting was to discuss purging and venting limits;- perfonnance of purge and vent valves during postulated LOCA, and related ~attefs for all CECo plants.
f!. lis_t of meeting attendees is enclosed.
The NRC had req.uested justification for continuing purging (and venting) of containments ~t licensed facilities in November 1978~ :cECo's -response of January 1979 had been fourid to be deficient in the foll01oJing areas: *
- no l ir;!itS on purge/vent ope rat ioTis had been-esfab 1 i shed for the interi~ p~riod while test/analysis programs are devel6ped.
no test/analysis progra::i had been established to verify valv~
operability for postulated LOCA conditions.
The need for containment purge/vent operations on the CECo facilities was discussed.
Basically, the PWR cont~innents are vented through 10 11 gate valves periodically to maintain containr;ient pressure within Technical Specification 1 imits.
The pressure in containment tends to build-up over time, primarily "due to instrument air bleed*; periodic cycling of air operated valves and process ~team leaks. - The PWR contai rnr:ents are purger! through 42" butterfly valves periodically to
- enab 1 e rnai ntenance access.
Most of the venting is done tlith. the pl ant at power~ -while r.iost of th<:o purg.ing -takes pl-ace with the pJ ant shutdm<1n *..
The 131.JR* containments* are vented through 2 11 globe valves periodically _ *
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. to control oxyg~n build-up and to mi nir:ii ze ex"posure in the event of.. 1ftiuo"'
personnel entry.* The BWR containments are purged through 18 11 butterfly _ a__h valves as required to enab1e personnel entry into an otherwise inerted
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- Dresden l is not ~~pected to return to ope~~tidn until late:l980!-
When
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N1LC FORM 318 (9-76) NRCM 0240
- u.s. GOVERNMEN~ *RINTING o.. PICE.: '"'.... : *** *79a 12-6 0 () :> I
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Meeting Summary 2 -
atmosphere.
- These purging evolution~ are in most :-instances associated with' a shutde>Wn, although* occasionally a-containment entry is made at reduced power ( 10-25%) to inspect for cool ant 1 eakage, for example.
The Technical Specifications all ow purgirig to: canmence up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> before the plant is shutdmm.
Most of the ventjng takes place with the plant
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at power.
The staff requested**infonnatfon on the amount of time-the CECo facilities purge/vent containment each year~. Zion Unit No. 2 reportedly averaged 2 ventings a week.for a~total of about 170 hours0.00197 days <br />0.0472 hours <br />2.810847e-4 weeks <br />6.4685e-5 months <br /> in 1978.
Zion Unit No. 1 averaged 3 t.o 4 ventings per week for a total of about 200.hours in 1978.
Zion Unit -No. l. reportedly purged for 283 hours0.00328 days <br />0.0786 hours <br />4.679233e-4 weeks <br />1.076815e-4 months <br /> in 1978, 42 hours4.861111e-4 days <br />0.0117 hours <br />6.944444e-5 weeks <br />1.5981e-5 months <br /> Hhi 1 e operating at power, the-rest \\'lhile shutdown.
Zion Unit No. 2 purged for
_a total of 31 hours3.587963e-4 days <br />0.00861 hours <br />5.125661e-5 weeks <br />1.17955e-5 months <br /> in 1978, all while shutdovm.
No specifiC infomation was available for the BWR's at the meeting.
During a fol lowup telephone cal 1 on June 29, 1978, CECo committed to the f o 11 owi ng :
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PWR 's:. No purgi rig at pm*1er v1il l be penr.itted* unt i1 the purge vahies have been analyzed and detennined capable of closing under postulated*
design basis accident condHions.
Only verftin9 as necessary to naintain Technical Specification lir.iits vdll be allo1-.1ed.
Ti1e vent*
valves will be analysed to verify capacity to cl cse under postulated DBA conditions.
/l.n attcr;ipt \\r!ill be made to test the vent valves durinq fall 1979 outage on Zion Unit No. 1.
A prograt1 to test the purge valves would be considered.
2 *. mm*s:
Purge operations will be limited to the minimum extent as required to maintain* plant operation..
A program for test/analysis of the purge valves will be considered.
The vent valves will be tested on Quad Cities Unit No. 2 during the next Containment Integra~ed Lea~
- P-ate Test.
Inforrnation on purge/vent times for 1978 will be-provided during the week of July 4, 1979.
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Fo*r both PWR 's and 13\\~R's CECo agreed to supplement their January 2, 1919 letter with the commitments noted above and with more details 'relating -
to valve analyses and tests to be done.
DISTRIBUTION:
See attached sheet
- SEE PREVIOUS YELLOW FOR CONCURRENCE John N. Hannon, Project Manager Operati nf' Reacto_rs Branch ;;~3 Division of Operating F!eactors
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7/2/79 7/2/79 XZXX7/2/79 DAT!!:~ ************************* *************************** *-************************ **************************************************** **********************
NJl.C FORM 318 (9*76) NRCM 0240 0
J,S. GOVERNMl!!:NT PRINTING Ol"P"ICE: 1171*Z~I*711
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- Name
-.. ~ : john Hannon Ed Reeves
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Landon Nicho1s
- Carl Berlinger
- ~n1 Mills John Zudans
- Janis Kerrigan
- E. G. Adens am David Shum
. A. Schwericer H. Wilber Charles Richardson Thomas Mohr James Joosten Cordell Reed Robert Janecek Hal Gustin
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CECO MEETING JUNE 28, 1978 Organization NRC NRC NRC NRC NRC
UNITED STATES NU-AR REGULATORY COMMISSION WASHINGTON. 0. C. 20555 Mr. C.. Reed Assistant Vice President Comnonwealth Edison.Company Pos~_Office Box 767 Chicago, Illinois 60690 Mr. John W. Rowe Isham, Lincoln & Beale Counselors at Law One First National Plaza, 42nd Floor Chicago, Illinois 60603 Mr. B. B.
St~phen~on Plant Superintendent Dresden Nuclear Power Station Rural Route #1 Morris, Illinois 60450 Anthony Z. Reisman Natural Resources Defense Co~ncil 917 15th Street, N. W.
Washington, D. C.
20005 Robert J. Vollen, Esquire 109 North Dearborn Street Chicago, Illinois 60602 Jimmy L. Barker*
U. S. Nuclear Regulatory Commission
.P. 0. Box706 Morris, Illinois 60450 Dr. Cecil Lue-Hing Director of Research and Development Metropolitan Sanitcry District of Greater Chicago.
100 East Erie Street
- Chicago, Illinois 60611 Mr. Phillip P. Steptoe
- rsham, Lineal n and Beale Counse 1 ors at Law One First National Plaza 42nd Floor Chi cage, 111 i noi s 60603 susan~-Sekuler Assistant Attorney General Environmental Control Division 188 W. Rand6lph Street Suite 2315 Chicago, Illir,Jis 60601 Mr. D. R. Stichnoth President Iowa-Illinois Gas and Elec)if-ic Cor:.::nny 206 East Seco~d Avenue Davenport, I o;-:2 5220"!
Mr. Nick Kalivianckas Pl ant Superi n:endent Quad Cities
~~:.;ciecr Power Station 22710 - 206th Avenue - North Cordova, 11 l i no is 61.2-42
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~Docket File 5b * ;231 NRC PDR Local PDR ORB#3 Rdg NRR Rdg H. Denton L Case D. Eis en hut*
B. Grimes W. Gammill R. Vollmer L. Shao J. Miller T. I ppo 1 i to R. Reid A. Sch\\'lencer V. Nooncn G. Knighton D
- Z i er.,rn n.
P. Check G. la inc.s D. Davis F. Page.no R. Clark OELD OI&E (3)
S.
She~-pard Project i*',ar.c.ger ACRS (i6)
NRC
!'crtic~p2nts TERA.