ML17195A737
| ML17195A737 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 03/22/1985 |
| From: | Zwolinski J Office of Nuclear Reactor Regulation |
| To: | Farrar D COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML17195A738 | List: |
| References | |
| GL-84-11, LSO5-85-03-019, LSO5-85-3-19, NUDOCS 8503260307 | |
| Download: ML17195A737 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Docket No. 50-237 LS05-85-03-019 Mr. Dennis L. Farrar Director of Nuclear Licensing*
Commonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Farrar:
March 22, 1985 *
SUBJECT:
PIPING INSPECTION AND REPAIRS DURING THE DRESDEN UNIT 2 CYCLE 10 REFUELING OUTAGE Re:
Dresden Nuclear Power Station, Unit No. 2 In Generic Letter (GL) 84-11, the staff delineated the actions that would be an acceptable response to the current concerns relating to interqranular stress corrosion crac~ing (IGSCC) in lar9e-diameter recirculatio~ and residua].. ~eat remo~al piping.
One of the actions required of the licensee was a submittal stating your cµrrent plans relative to inspections for IGSCC and interim leak detection.
In your response you were to indicate whether you intended to follow staff recommended actions in r,L 84-11 or propose an alternative approach to resolving 1r,scc concerns.
In a letter.dated September 17, 1984, you furnished your plans which the staff, aftef a brief.meeting with members of your staff, accepted. In a followup letter dated December 19, 1984, you'indicated that your inspectio.n was complete and stated that the sample of welds inspected in the Reactor Water Cleanup (RWCU) system had been expand~d, because of crack indications in that system, to include all accessible RWCU welds.
You also indicated your inte~t, at that time, to replace the RWCU Class 1 piping outside of containment with conforming material and to overlay five welds with cracks inside the drywell.
Subsequently, you informed the staff verbally that you were also going to replace the RWCU Class 1 piping inside the drywell up to Motor Operated valve 2-1201.
This section of piping contained four of the cracked welds and you indicated your intention to overlay the fifth.
- The staff has reviewed your submittals regarding the inspection and repairs performed on the jet-pump instrumentation nozzle penetration assemblies and the Recirculation, Residual Heat Removal, Control Rod Drive, Head Vent and RWCU piping systems during the current refu~ling outage.
Based on this review, which is documented in the enclosed Safety Evaluation and which includes input
- from inspection personnel from Region III, the staff concludes that your IGSCC inspection and repairs were performed in accordance with the requirements of GL 84-11 ar.d *that Dresden Unit 2 can be safely.returned to operation for one.
18-month fuel cycle.
r 8503260307 850322
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Mr~*Dennis L. Farrar
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S1nce neither your September 17 or December. 19, 1984 letters addressed the GL84-ll req!Jest for a 11des,cription of any special surveillance measures,*,.
in eff~ct or proposed, for primary system leak detection, beyond those. * *
- measures*already required by your Technical.'Specif.ications, 11 the staff requests *that you _submit. a ~echnical Specifications *amendment change which.
implements*t~e Jeak detection requirements.proposed in Sectio~ s*of Attach-ment l of GL' 84-ll. Since the.re remains a' residual concern regarding* the long term*growth of.s'mall I(]SCC cracks that may°' be present but not detected durJng' this *inspection, the *staff als"o requests that plaris for inspe'ction '
and/o~ modificatirin of the reciriulation*and other reactor coolant pressure boundary piping systems *during the next refueling outage be submitted for staff review at least three ~cihths before the start of the next refueling,.
outage.
Finally., the staff requests that information, similar tp -that.in
- your December 19*,* 1984. letter*, 1reporting the details of'the RWCU. pipe replacement program inside conta.inment be_ furnished within 30 day~. of rece.ipt
. *of this letter.
- This request for.information was approved*by the *Office of Management and Budget under:'.clearance number 3150-.0011: which *expires April 30, *t985.
Comments on burden and.duplicatirin may be.directed tri the Office of Management*and Budget, Reports Management Room 3208, New Exe~utive Office Building, Washtngton, D.C.
20503.
Enclosu.re:
Safety ~v~l~ation
. SJncere-ly, Jo~~n~i, Chi~*f
- Operating Reactors Branch is*
Division of Lfcenstng
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cc w/enclosure:
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- See ne"xt,page
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Mr. Dennis L. Farrar cc Robert G. Fitzgibbons Jr.
Isham, Lincoln & Beale Three First National Plaza Suite 5200 Chicago, Illinois 60602 Mr. Doug Scott Plant Superintendent
- Dresden Nuclear Power Station Rural Route #1 Mo.rri s, I 11 i noi s 60450 U. S. Nuclear Regulatory Commission Resident Inspectors Office Dresden* Station Rura 1 Route #1 Morris, Illinois 60450 Chai man Board of Supervisors of Grundy County Grundy**county Courthouse Morris, Illinois 60450 U. S. Environmental Protection Agency Federal Activities Branch
- Region V Office ATTN:
Regipnal Radiation Representative 230 South Dearborn Street Chicago, Illinois 60604 James G. Keppler, 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 March 22, 1985