ML17180B079
| ML17180B079 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities  |
| Issue date: | 01/31/1995 |
| From: | Stang J Office of Nuclear Reactor Regulation |
| To: | Farrar D COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML17180B080 | List: |
| References | |
| GL-94-03, GL-94-3, TAC-M90088, TAC-M90089, TAC-M90109, TAC-M90110, NUDOCS 9502030072 | |
| Download: ML17180B079 (4) | |
Text
UNITED STATES
- NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 January 31, 1995 Mr. D. L. Farrar Manager, Nuclear Regulatory Services Commonwealth Edison Company Executive Towers West III 1400 Opus Place, Suite 500 Downers Grove, IL 60515
SUBJECT:
RESOLUTION OF GENERIC LETTER 94-03, "INTERGRANULAR STRESS CORROSION CRACKING OF CORE SHROUDS IN BOILING WATER REACTORS" AT DRESDEN, UNITS 2 AND 3, AND QUAD CITIES, UNITS l AND 2 (TAC NOS. M90088, M90089, M90109, AND M90110)
Dear Mr. Farrar:
On July 25, 1994, the NRC issued Generic Letter (GL) 94-03, 11 Intergranular Stress Corrosion of Core Shrouds in Boiling Water Reactors," to BWR licensees to address the potential for cracking in their core shrouds.
The GL requested BWR licensees to take the following actions:
inspect their core shroud at the next scheduled refueling outage; perform a safety analysis supporting continued operation until inspections are conducted; develop an inspection plan; develop a plan for evaluation and/or repair of the core shroud; and work closely with the BWROG on coordination of inspections, evaluations, and repair options for all BWR internals susceptible to intergranular stress corrosion cracking.
By letter dated August 23, 1994, Commonwealth Edison Company (ComEd) responded to GL 94-03 for Dresden, Unit 2, and Quad Cities, Unit 2.
The staff reviewed ComEd's response to the GL and found open items.
As a result, the staff*
issued a request for additional information (RAI) dated September 27, 1994.
By letters dated October 7, 1994, and October )3, 1994, ComEd responded to the RAI.
At the request of the NRC staff, ComEd met with the staff to discuss ComEd's responses to GL 94-03.
As a result of the meeting, additional open items were identified.
By letter dated November 14, 1994, the staff issued another RAI.
By letter dated December 14, 1994, ComEd responded to that RAI.
The staff has reviewed all the information provided by ComEd concerning GL 94-03.
Enclosed is the staff's safety evaluation.
Based on the enclosed safety evaluation, the staff concluded that Dresden, Unit 2, and Quad Cities, Unit 2, -can co~tinue to -be-safely operated until. each unit's next scheduled refueling outage, at which time the core shrouds at each unit will be 0_2_QC:_!:1_t:~~ -----,--------,
(~, ~-9-5_0_2~030072 950131 I:,'
PDR ADOCK 05000237 I
P PDR 1
--~-~
-~ -----
D. repaired.
In accordance with GL 94-03, ComEd has provided the repair proposal for Quad Cities, Unit 2, core shroud by letter dated January 16, 1995, and has indicated that the Dresden, Unit 2, core shroud repair proposal will be submitted in the near future for staff review and approval.
During the last refueling outages at Dresden, Unit 3, and Quad Cities, Unit 1, the core shrouds were inspected.
Severe cracking was detected in both units at the HS weld location.
The licensee provided a crack analysis that demonstrated that the cracked core shrouds could maintain margins against failure as specified in Section XI of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (Code).
The staff evaluated ComEd's analjsis to determine if the degraded shrouds have adequate safety margins to meet the requirements of the ASME Code.
By letter dated July 21, 1994, the staff issued a safety evaluation concluding that the cracked shrouds
. would satisfy ASME Code margins against weld failure for 15 months of operation above crild shutdown.
This concludes the staff's evaluation of GL 94-03 for Dresden, Units 2 and 3, and Quad Cities, Units 1 and 2.
Sincerely,
- Original signed by:
-~
J6hn F. Stang, Senio~ Project Manager
.. Project DiH~*ttorate 111-2
- ~DJ.vision,of-.~eactor Projects :-.}ill/IV Off,fc~, of Nuclear_Reactor*Regul'at.ion Docket Nos.
50~237, 50-249, 50-254, 50-265 i*
I
';~
1.:
Enclosure:
. Safety Evaluation J
> ("
. ~-
- 1.
(-'
'.,.J cc w/encl:
see next page *.,_
~ -.*
~
. '-~(\\.--*.
DISTRIBUTION Docket Files RCapra OGC
. PUBUC*,
CMoore'(2f..
ACRS(4)'*:.
'.'. *:1 _.._
~. :r. !I
~
-~
"'* *,~ j
~*
~ *~
~ PDJI*I.'.i2:. ri;:f:,_.
j"RQ~ .
.
- RPul si fer '...
Jst~n9<
~
_, PHtJ,and, RI II. r*
- DBf.i n"kman 1,.
'l
.. ~, *"
. ~**
I
)
DOCUMENT NAME:
G: \\ CMRCJR\\DRESDEN\\DQ90088. LTR.,
\\
To receive a ox: "C" = Copy without enclosures "E" = Copy ~ith enclosures "N" = No copy OFFICE e..,.. PM:
NAME JS DATE 01 01/ /95 OFFICIAL RECORD COPY
D. L. Farrar Commonwealth Edison Company cc:
Michael I. Miller, Esquire Sidley and Austin One First National Plaza Chicago, Illinois 60690 Mr. Thomas P. Joyce Site Vice President Dresden Nuclear Power Station 6500 North Dresden Road Morris, Illinois 60450-9765 Mr. J. Eenigenburg Station Manager, Unit 2 Dresden Nuclear Power Station 6500 North Dresden Road Morris, Illinois 60450-9765 Mr. D. Bax Station Manager, Unit 3 Dresden Nuclear Power Station 6500 North Dresden Road Morris, Illinois 60450-9765 U.S. Nuclear Regulatory Commission Resident Inspectors Office Dresden Station 6500 North Dresden Road Morris, Illinois 60450-9766 Regional Administrator U.S. NRC, Region III 801 Warrenville Road Lisle, Illinois 60532-4351 Illinois Department of Nuclear Safety Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield, Illinois 62704 Chairman Grundy County Board Administration Building 1320 Union Street Morris, Illinois 60450 Dresden Nuclear Power Station Unit Nos. 2 and 3
D. L. Farrar Commonwealth Edison Company cc:
Mr. Stephen E. Shelton Vice President Iowa-Illinois Gas and Electric Company P. 0. Box 4350 Davenport, Iowa 52808 Michael I. Miller, Esquire Sidley and Austin One First National Plaza Chicago, Illinois 60690 Mr. L. William Pearce Station Manager Quad Cities Nuclear Power Station 22710 206th Avenue North
~ordova, Illinois 61242 U.S. Nuclear Regulatory Commission Quad Cities Resident Inspectors Office 22712 206th Avenue North Cordova, Illinois 61242 Chairman Rock Island County Board of Supervisors 1504 3rd Avenue Rock Island County Office Bldg.
Rock Island, Illinois 61201 Illinois Department of Nuclear Safety