ML17195A805
| ML17195A805 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 05/22/1985 |
| From: | Zwolinski J Office of Nuclear Reactor Regulation |
| To: | Farrar D COMMONWEALTH EDISON CO. |
| References | |
| IEB-84-01, IEB-84-1, LSO5-85-05-022, LSO5-85-5-22, NUDOCS 8505290459 | |
| Download: ML17195A805 (3) | |
Text
e UNiTED STATES e
NUCLEAR REGUt:.A:rORYE.:OMMISSION WASHINGTON, D. C. 20555 Docket No. 50-237/249 LSOS-85-05-022.
Mr. Dennis *L. Farrar Director of Nuclear Licensing Corrnnonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Farrar:
May 22, 1985
SUBJECT:
IE BULLETIN NO. 84-01:
CRACKS IN BWR MARK I CONTAINMENT VENT HEft.DERS Re:
Dresden Nuclear Power Station, Unit Nos. 2 and 3 On
~eb*ruary 3, 1984, Georgi a Power Company reported a through-wa 11 crack almost completely around the* vent header within the containment torus of*
Hatch Unit 2.
Later that day, IE Bulletin 84-01, "Cracks in Boiling Water Reactor Mark I Containment Vent Headers, 11 was issued for ~ction to the 1icenseP.s of BWR facilities with Mark I containments that were in cold shutdown.
The bulletin required inspection for cracks in the containment vent header and in the main vents in the region near the intersection with the vent header.
The bulletin also suggested that the operating BWR plants with.Mark I containments should ~eview their plant data on differential pressure between the wetwell a~d the drywe11 for anomalies that could be indicative of cracks.
By a letter.dated February 10, 1984, Corrrnonwealth Edison Company (CECo) responded to IE Bulletin 84-01.
CECo stated that an inspection of the Dresden 3 drywell main vents and vent header was performed on February 4, 1984 by qualified VT-1 visual inspectors foilowing the guidelines for inspection outlined.in Visual Examination Procedure VT-1-1. _No visual indications of weld fatigue were ob-served as a resL1lt of.t'his-inspection.
CECo committed, in an April 17, 1984 letter respondfng to General Electric SIL 402 on this issue, to perform a similar inspection for Dresden 2 during the next outage.
The staff was informed that this latter inspection was performed during an outage from June 21, to June 30, 1984.
Again, no visible indications were observed.
This issue was also evaluated by the Dresden reside~t inspectors in their Inspection Report 84-03 (Dresden 2) and 84-02 (Dresden 3) dated April 11, 1984.
On page 8 of that Report, the inspectors stated that, based on reviews of examination results a~d a written report by CECo on Dresden 3, interviews with licensee personnel and independent observations, the licen-see had satisfactorily met the bulletin's.requirements.
In addition, the Report indicated that the Senior Resident Inspector had determined from conversations with his counterpart at Hatch that the Dresden design for the nitrogen inerting line to the torus is different from that at Hatch.
The Report then i nd,i ca te*d -that,- becaus-e1 of this design difference, an occurrence similar to that at Hatch dµe to cold nitrogen on the vent header is unlikely at Dresden..
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Mr. Dennis May 22, 1985 Based on the above discussion, the fact that CECo submitted a formal response to IE ~ulletin 84-01 for Dresden Nuclear Power Station by October 1, 1984 and that inspections to ensure actions were performed as reported
'Were made, the staff finds that CECo's response to the bulletin is accept-able and the issue i~ closed for the Dresden Station.
cc:
See next page DISTRIBUTION Docket File NRC PDR Loca 1 PDR '
NSIC ORB #5 Reading JZwolinski CJamerson RGilbert OELD ACRS (10)
BG rimes JPartlow HThompson EJordan GHolahan DL: ORB #5t
- CJamerson:c l IJI /85 DL/~ #5 RGilbert s
/~} /85 Sincerely, John A. Zwolinski, Chief Operating Reactors Branch #5 Division of Licensing DL: ORB #5 JZwolinski
~ /1.11//85
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Mr. Dennis L. Farrar Commonwealth Edison Company cc:
Robert G. Fitzgibbons Jr.
Isham, Lincoln & Beale Thr~e Fi~st National Plaza Suite". 5200 Chicago, Illincis 60602 Mr. Doug Scott Plant Superintendent Dresden Nuclear Power Station Rural Route #1 Morris, Illinois 60450 U. S. Nuclear Regulatory Commission Resident Inspectors Office Dresden Station Rural Route #1 Morris, Illinois 60450.
Chairman Board of Supervisors of Grundy County
~rundy County Courthouse Morris, Illinois 60450 U. S. Environmental Protection Agency Federal Activities Branc~.
Region V Office Dresden Nuclear Power Station ATTN:
Regional Radiation Representative.
230 South Dearborn Street Chicago, Illinois 60604 Regional Administrator Nuclear Regulatory Commission, Region III 799 Roosevelt Street Glen Ellyn, Illinois 60137 Gary N. Wright, Manager Nuclear Facility Safety Illinois Department of Nuclear Safety 1035 Outer Park Drive, 5th Floor Springfield, Illinois 62704