ML20043C016
| ML20043C016 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 05/25/1990 |
| From: | Roberts T NRC COMMISSION (OCM) |
| To: | Evans L HOUSE OF REP. |
| Shared Package | |
| ML20043C017 | List: |
| References | |
| NUDOCS 9006010186 | |
| Download: ML20043C016 (8) | |
Text
,
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Distribution:
EDO r/f UNITED STATES EDO 5437
.. y?
g NUCLEAR REGULATORY COMMISSION ~
3 JTaylor y a W ASHING TON, D. C,20565 HThompson
- [
'S JSniezek May 25, 1990
....+
JBlaha CHAlHMAN
.TMurley/FMi raglia l
RDudley 1
WRussell JZwolinski AThadani L01shan.
The Honorable Lane Evans JScinto CYCheng E
United States House of Representatives GHolahan-FGillespie Washington, D.C.
20515
.CMoore
-ABDavis, Rill
~
DCrutchfield
Dear Congressman Evans:
CSmyre.
JPartlow I am responding to your letter of May 3, 1990, in which you requested to be kept up-to-date concerning the cracks discovered in the reactor vessel--
head of Quad Cities Unit 2.
As you noted, the:NRC-staffLheld a meeting l
with Comonwealth Edison (the licensee) on April 19. 1990,-to discuss the q
cracks. Enclosure 1 is a copy of the meeting sumary. After reviewing the information presented at the meeting, the staff' concurred.that.
operation with the cracks poses no safety concern.- Further,.the staff has determined that the actions taken by Commonwealth' Edison were timely and L
appropriate.
The licensee's examination and analysis revealed that most of the cracking.
j was contained in the cladding, which is a ~ stainless ~ steel coating on thel inside of the reactor vessel head and is not required;to maintain' structural integrity of the vessel.
For those cracks that' occurred in the 1
low-alloy' steel reactor vessel head,'the deepest crack-in the base metal penetrated.to a depth that was only about five' percent of the total' four-inch thickness of the vessel dome.
According to the licensee's evaluation, the maximum predicted growth.of. the cracks over the remainder d
of this operating cycle should not be significant and therefore would not compromise the structural integrity of theLyessel.
In its letter of May-4,1990 (Enclosure 2), Comonwealth' Edison comitted-to inspect the reactor vessel head at the next< refueling outage, which is q
scheduled for September 1991. The NRC staff will review the:results of~
t that inspection and will detemine whether any expected growth of the L
cracks might compromise structural integrity of the vessel. The NRC will i
continue to-monitor the situation-through its nomal. inspection program.
As you requested, we will keep you. updated on this' matter by sending you additional documents as they' become available and. by notifying you of any planned meetings,-
Sincerely, f
Thomas M. Roberts Acting. Chairman
Enclosures:
9006010186 900525
~
As stated PDR ADOCK 05000265 1r 1
U V5 lQ PDC Originated:
NRR:01shan p '
j DISTRIBUTION:
DocketFiles(50-265)
NRC& Local PDRw/inc ED0#0005437-EDO R/f TMurley/FMiraglia JPartlow-PDIII-2'r/fw/ incoming GHolahan JZwolinski RDudley CHoore LOlshan OGC GPA/CA JTaylor PMAS (ED0f0005437)w/inc.- PDIII-2 GT File CYCheng WRussell DCrutchfield FGillespie AThadani CSyre' JSnieze(-
HThompson JBlaha Davis,RIII i
JScinto, OGC d
The Honorable Lane Evans M<- /
X
'i U.S. House of Representatives
- C /L c - 70. O M Washington 00 20515-ia
Dear Congressman Evans:
This letter is in response to your letter of May 3,1990, concerning the cracks discovered in the reactor vessel. head of Quad Cities nit 2.4 As you noted, the NRC staff held a. meeting with Commonwealth Edi (thelicensee)~
on: April'19, 1990; to discuss the cracks.
a copy of the meeting summary.. Af ter reviewing. the information pr nted;.at the meeting, we are confident that operation with the cracks po s no safety concern.
Further, ourcstaff experts have. determined that e actions taken by Commonwealth Edison were timely and appropriate.
Also, the -investigation and analysis reve led that most.of the cracking was contained in the-cladding, which is a e ting on the inside of the reactor vessel head and is-not-required to mai tain structural integrity of the.
vessel. =The deepest crack.in the bgs6 metal penetrated to a, depth that was H
only about five.percenttof the t tal four-inch thickness of: the vessel dome.
According to the evaluation, t maximum predicted growth of the cracks should not be significant and should not compromise the structural integrity of the vessel.
In their' letter of;May
,1990 (Enclosure 2), Commonwealth Edison _ connitted
-i
~
to inspect the reacto vessel head at the next refueling outage..The-NRC will rev'iew the re ts;from that inspection and will continue to monitor the situation thr h the normal inspection program, j
.i As you reques 4, we will keep you-updated on-this matter by sending you additional cuments as they become; available and by notifying you of any 1
planned m tings.
Sincerely, i
4 James M. Taylor Executive Director
~for 0perations
Enclosures:
'As stated l
DOCUMENT NAME: GT0005437
- SEE PREVIOUS CONCURRENCES Office:
.LA/PDIII-2 PM/PDIII-2 (A)PD/PDIII-2 Surname: *CMoore
- L01shan/tg
- RDudley Date:
05/10/90 05/10/90 05/10/90 Office:
AD/DRSP (A)D/DRSP ADP/NRR TECH ED Surname: JZwo s ki
- GHolahan
- JPartlow
- JMain Date:
90 JM0
-05/14/90 05/14/90 Office:
DD 6 8
/ )/NRR ED0 Surname:- F a
- plur JTaylor Date:
d1
, 90 M/
90 T /90 4
[
DISTRIBUTION:
DocketFHes(50-265)
NRC& Local PDRw/inc ED0f0005437 EDOR/fL.
TMurley/FMiraglia :
JPartlow PDIII-2 r/fw/ incoming;
-GHolahan JZwolinski RDudley CMoore L01shan OGC GPA/CAl JTaylor PMAS-(ED0f0005437)w/inc.PDIII-2GTFile CYCheng WRussell DCrutchfield FGillespie:
AThadani-CSmyre JSniezek1 HThompson JBlaha Davis,RIII JScinto, OGC The Honorable Lane Evans U.S. House of Representatives Washington, DC 20515
Dear Congressman Evans:
This letter is in response to your letter of May 3,1990, concerning the cracks discovered in the. reactor vessel head of Quad Cities, Unit 2. LAs you-noted, the NRC staff held a meeting with;Conunonwealth Edison (the' licensee) on' April:19,'1990, to discuss the cracks. ' Enclosure l' is a copy of the meeting summary. After reviewing the information presented at the meeting,;
we are confident that operation with the cracks poses no safety concern; Further, our staff experts have; determined that the actions taken by Commonwealth Edison were timely and appropriate'-
1 Also,ined in the cladding, which.is a coating on the inside of the:reactorthe investigation a conta vessel head and is not required to^ maintain structural; integrity of the vessel. The deepest crack in the base metal penetrated only:about five-percent-into the four-inch thickness of_the vessel dome. According'to'the evaluation, the maximum predicted growth of_ cracks should not be significant and should not compromise the structural integrity:of.the' vessel.-
a In their letter of May 4, 1990'(Enclosure 2), Commonwealth Edison committed' to inspect the reactor vessel head at the!next, refueling outage. The NRC; will review the results from that-inspection'and willecontinue to monitor the situation through the normal inspection program, i
As you. requested, we will keep you updated ~on this matter by sending you-additional documents as. they become available-and by notifying you of any_
planned meetings.
Sincerely,.
James M. Taylor Executive Director
'for Operations As stated I
DOCUMENT.NAME: GT0005437 o
- SEE PREVIOUS CONCURRENCES Office:
LA/PDIII-2 PM/PDIII-2 (A)PD/PDIII-2 i
Surname:
- CMoore
- L01shan/tg
- RDudley Dete:
05/10/90 05/10/90 05/10/90 1
Office:
AD/DRSP (A)D/DRSP ADP/NRR TECH ED Surname: JZwolinski
- GHolahan
- JPartlow 76,i Date:
/
/90 05/11/90
'05/14/90
$/11/90 Office:
DD/NRR D/NRR ED0 A
Surname:
FMiraglia 1Murley-JTaylor Date:
/
/90
_/ /90
/ /90
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W DISTRIBUTION:.
DocketFilesl50-265)
HRC&Locd ?DRw/inc ED0f0005437 EDO R/f-TMurley/FMiraglia JPartlow PDIII-2 r/fw/ incoming GHolahan JZwolinski The Honorable Lane Evans RDudley CMoore L01shan Member, United States OGC GPA/CA JTaylor' 3
House of Representatives PMAS(ED0f0005437)w/inc.PDIII-2GTFile CYCheng Washington, DC 20515
'WRussell DCrutchfield FGillespie AThadani CSmyre JSniezek-
Dear Congressman Evans:
HThompson JBlaha Davis,RIII
~,
JScinto, OGC This is in response' to your letter of May 3,1990, concerning the cracks discovered in the reactor vessel head of Quad Cities, Unit 2.
As you noted, the NRC staff-held a meeting with Comonwealth Edison on April 19, 1990, to
' discuss the cracks. is a copy of the meeting sumary. After reviewing;the information presented at the meeting, we are confident that
-operation with the cracks poses no safety concern. Further, our staff-experts have determined that the actions taken by Comonwealth Edison were timely and appropriate.
Also, our investigation and analysis revealed that most of'the cracking was-contained in the cladding, which 1s a coating on the inside of the reactor-vessel' head and is not required to maintain structural integrity of the vessel.
The deepest cracking in the base metal was about five percent of the four-inch vessel dome thickness. The maximum predicted growth of potential cracks-in the-areas where they were repaired has been evaluated to not be significant and will not compromise the structural integrity of the vessel.
In their letter dated May 4,1990 ~(Enclosure 2), Comonwealth Edison comitted to inspect the reactor vessel head at the next refueling outage. The NRC will review the results from that inspection and will continue to monitor the situation through the normal inspection program.
As you requested, we will kee) you updated on this matter by sending you additional documents as they secome available and by notifying you of any planned meetings that we may have.
Sincerely, James M. Taylor Executive Director for Operations
Enclosures:
As stated j
DOCUMENT HAME: GT0005437
- SEE PREVIOUS CONCURRENCES Office:
LA/PDIII-2 PM/PDIII-2 (A)PD/PDIII-2 Surname: *CMoore
- L01shan/tg
- RDudley Date:
05/10/90 05/10/90 05/10/90 h
TECH ED Office:
AD/DRSP (A)D/DRSP ADP/NRR Surname: JZwolinski
- GHolahan JPartlow Date:
/
/90 05/11/90 b/$/90
/ /90 Office:
DD/NRR D/HRR ED0 Surname:
FMiraglia TMurley JTaylor Date:L
/
/90
./ /90-J/? /90
l l
L DISTRIBUTION:
.DocketFiles(50-265)
NRC& Local PDRw/inc E00#0005437 E00 R/f
-TMurley/FMiraglia JPartlow PDlII-2 r/fw/ incoming GHolahan.
JZwolinski The Honorable Lane Evans RDudley CMoore L01shan Member, United States OGC GPA/CA JT6ylor I
House of. Representatives PMAS (ED0#0005437)w/inc. PD111-2 GT File AYCheng Washington, DC 20515.
WRussell DCrutchfield
/ FGillespie i
AThadani CSinyre JSniezeki
'j
Dear Congressman Evans:
HThompson
'JBlaha Davis,RIII-i JScinto, OGC This is in response to your letter of May 3,1990, concerning th cracks.
discovered in the reactor vessel head of Quad Cities, Unit.2. jAs you noted,.
the NRC staff held a meeting with Commonwealth Edison on Apr 19, 1990, to
=i discuss the cracks..is a co)y of the meeting-- s unary. - After -
reviewing the information presented at tu meeting, we are confident that y
operation with the cracks poses no safety concern.
Furt er, our staff experts have determined that the actions taken by Commonwealth dison were timely and appropriate..
1 Also, our investigation and analysis revealed that/most of the cracking was 3"
containedinthecladding,whichisacoatingonAhe'insideofthereactor.
vessel head and is not required to maintain structural. integrity of the vessel.
1 The deepest cracking-in the base metal was.abotit five percent'of the four-inch 1
vessel dome thickness. The maximum preaicte(growth of potential: cracks'in the 1
areas where they were repaired has been evaluated to not be significant and will not compromise the structural integr tylof the vessel.
U In the letter dated May'4, 1990 (Enclos re 2), Commonwealth Edison committed to inspect the reactor vessel head at/the next refueling' outage.
The NRC 1
will review the results from that ipspection and will continue to monitor-J the situation ~through the normal inspection program.
As you requested, we will keep ou updated on this reatter by sending you additional documents as they come available and by notifying you of any ~
a planned meetings that we may ave.
j Sincerely, I
James M. Taylor.
1 Executive Director for Operations i
Enclosures:
As stated
/-
1 j
DOCUMENTHAMI: GT0005437
- SEE PREVIOUS CONCURRENCES Office:
LA/PDIII-2 PM/PDIII-2
'(A)PD/PDIII-2 Surname,: *CMoore
- L01shan/tg
- RDudley Date:
05/10/90 05/10/90
-05/10/90 Office:
AD/DRSP (A)D/DRSP ADP/NRRpf TECH ED Surname: JZwolinski GHolahan JPartlow6)
Date:
/
/90
/
/90
/-
/90
/ /90 Office:
DD/NRR D/NRR EDO Surname: FMiraglia TMurley JTaylor Date:
/
/90
/ /90
/ /90 l
4 p
DISTRIBUTION:
/
DocketFHestS0-265)
HRC& Local PDRw/inc ED0f0005437 EDO R/f-TMurley/FMiraglia-JPar,tiow PDIll-2 r/fw/ incoming GHolahan JIwolins ki The Honorable Lane Evans RDudley CMoore pJTaylor 1shan Member, United States OGC GPA/CA i
House of Representatives PMAS(E00f0005437)w/inc.PDIII-2GTFile CYCheng
-l Washington, DC 20515 WRussell DCrutchfield FGillespie AThadani CSmyre.
JSniezek
Dear Congressman Evans:
HThompson JBlaha-
- Davis,RIII JScinto, OGC This is in response to your letter of May 3,1990, concernin e cracks j
discovered in the reactor vessel head of Quad Cities, Unit-2 As you noted, the HRC staff held a meeting with Commonwealth Edison on Ap 1 19, 1990, to discuss the cracks. Enclosure-1 is 'a copy of the meeting /sunnary. Af ter reviewing the information-' presented at the meeting', we 4te confident that continued operation with the cracks: poses no safety _ co tern. Most of the cracking is contained in the cladding,'which.is mere a coating on the inside'of the reactor vessel head and is not needed' o maintain structural integrity of the vessel. The deepest-. cracking.in,he base metal was only-aboutfivepercentofthefour-inchvesseldomephickness. The maximum i
predicted growth of the cracks until the next rpfueling outage is not i
significant and will-not compromise the struc oral integrity of the vessel.
j In the letter dated May 4, 1990 (Enclosure
), Connonwealth Edison connitted to inspect the reactor vessel hp d at the next refueling outage.
l The NRC will review the results from that" inspection and will. continue to i
monitor the situation.through the norm f inspection program.
1 As you requested, we will keep you u dated on this matter by sending you i
additional documents as they becom available and by notifying you of any i
planned meetings that we may have Sincerely, a
James M. Taylor Executive Director for O m ations-
Enclosures:
As stated l
DOCUMENT HAME:
000'437 1.
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LA 11-2 IWP I'
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Date:
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.a DUE:'05/17/90 EDO CONTROL: 0005437
'FROM:
e.
. DOC DT: 05/03/90 FINAL. REPLY:
- R2p. Lane Evans' ETO:
' Chairman Carr FOR SIGNATURE 0F:
- -PRI
' CRC NO: 90-0486-j Executive Director I
.DESC:.
ROUTING:
.CONCERi4S RE. CRACKS IN THE DOME OF. QUADS CITIES Taylor i
REACTOR NO.'2 - WOULD LIKE TO BE KEPT. UPDATED-ON Sniezek:
TilIS - MATTER AND NOTIFIED OF ANY : MEETINGS THAT MAYi Thompson BEEPLANNED1BY THE NRC TO CONSIDER THIS PROBLEM Blaha-Davis,f RIII.-
DATE: 05/08/90-Scinto, OGC 1
. ASSIGNED TO:
CONTACT:
Np NRR Murley-P h:
'SPECIAL INSTRUCTIONS.OR REMARKS:
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NRR ROUTING:
MURLEY/MIRAGLIA
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PARTLOW
.t RUSSELL
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ATHADANI' f
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DUE TO NRR DIRECTOR'S OHW BY d, / f 96 s
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l OFFICE OF THE SECRE'2(LRY CORRESPONDENCE CONTROL TICKET PAPER NUMBER:.
CRC-90-0486 LOGGING DATE:.May 7 90-i ACTION. OFFICE:-
.EIX) i AUTHOR:
Lane Evans AFFILIATION:
'U.S.
HOUSE OF REPRESENTATIVES LETTER DATE:
May-3 90' FILE: CODE:'ID&R-5 Quad Cities Would like to be kept' informed on' safety hazards i
SUBJECT:
i surrounding cracks in-the dome of: reactor No. 2 at 1
Commonwealth Edison's Quad. Cities nuclear gen-station 1
ACTION:
Signature of EDO j
DISTRIBUTION.
Chairman, Docket SPECIAL HANDLING: None
-1 NOTES:
I DATE-DUE:
May 21'90 DATE SIGNED:
SIGNATURE:
AFFILIATION:
t i
4 i
i l
s i
Eb6 DON.EDO l
Dats _
f V. 9 o j
Time _-
'C;D A,m ED0'--- 005437
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