ML20080N001
| ML20080N001 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 02/06/1984 |
| From: | Larson C NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-84-01, IEB-84-1, NUDOCS 8402220056 | |
| Download: ML20080N001 (3) | |
Text
h Northern States Power Company Monticello Nuclear Generating Plant P.O Box 600 Monticello, Minnesota ss362 February 6, 1984 Mr. James G. Keppler, Director Region III, Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glenn Ellyn, Illinois 60137
Dear Mr. Keppler:
MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 The following is submitted in response to IE Bulletin 84-01:
1.
IE Bulletin 84-01 (Cracks in Boiling Water Reactor Mark I Containment Vent Headers) was issued for action to all BWR plants having a type Mark I Containment who were currently in cold shutdown.
The action required was to visually inspect for cracks in the entire vent header and in the main vents in the region near the intersection with the vent header, and as practicable to include the entire surfaces of these components.
2.
This inspection at the Monticello Nuclear Plant was conducted by certified plant staff welding inspectors, using flashlights for the internal examinations and flashlights and quartz high intensity lamps for the external surface examinations.
All accessible surfaces and welds of the exterior (approximately 2/3 of the circumference) were examined from the catwalk and on top the Vent e
Header and vent line assemblies (inain vents) with particular concentration of effort in Bay 13 where the nitrogen penetration from the vaporizer enters the torus and at the intersections of the eight (8) vent header and vent line assemblies. The remainder of the external surface area and welds were inaccessible due to the normal water level in the torus.
One hundred percent of the welds and surfaces for the vent header were examined internally including each vent line assembly (main vent) up to the missile barrier inside the bottom of the drywell.
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No cracks or crack indications were noted in any weld or surface on the Monticello~ vent header.
-Very truly your S'
C. E. Lars Director, Nuclear Generation cc:
C. H. Brown, Monticello NRC Resident Inspector IEB 84-01 File - Monticello Library U.S. Nuclear Regulatory Commission, Document Control Desk Washington, D.C.
20555 1
O-UNITED STATES HUCLEAR REGULATORY COMMISSION NORTHERN STATES POWER COMPANY M0tfrICELLO NUCLEAR GENERATING PMNT Docket No. 50-263 RESPONSE TO I.E. BULLETIN NO. 84-01 Northern States Power Company, a Minnesota corporation, hereby submits the response to I.E. Bulletin No. 84-01 for the Monticello Nuclear Generating Plant.
This letter contains no restricted or other defense information.
NORTHERN STATES POWER COMPANY
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/9f/,beforemeanotarypublicinand On thia for said County, personally appeared C. E. Larson, Director, Nuclear Generation, and being first-duly sworn acknowledged that he is authorized to execute this document on behalf of Northern States Power Company, that he knows the contents thereof and that to the best of his knowledge, information and belief, the state-ments made in it are true and that it is not interposed for delay.
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