ML20024G304
| ML20024G304 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 03/11/1975 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Mayer L NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 9102110267 | |
| Download: ML20024G304 (3) | |
Text
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f h0( C y 6 Ql, Docket No. 50-263 ue hoM SoM Northern States Power Company e
AT1ns Mr. L. O. Hayer Director of Nuclear Support Se rvices 414 Nicollet Hall Minneapolis, Minnesota 55401 Centlement In connection vith our continuing review of recent xcurrences of cracking in stainless steel pipes, we are requesting suppleasent al data from operating bVR plants.
(ou are requested to provide water chemistry data, preferably in trapi fom (saeple Fraphs are atisched), showing the result s of all analyses perf ormed over the last year of operation.
1he data.:hould include chlorices, p!1, conductivity, and oxygen under the followinF conditions Prior to st art-up (non-pressurized, below 212 7 and/or cold shutdown) a.
b.
khen the reactor is pressurized (above 212 F and up to 10% of rated powe t )
c.
Durfor hot st and-by d.
During rout ine operating conditions (above 10% rated power)
The locations f rom which tha :sts were taken should be indicated.
The preferred sa ple locations are those representative of the bulk reactor coolant rather than the effluent free a dernineraliser.
If any raterial was added to the reactor coolant at anytime, please indicate the raterial, the l oc a t ion of t he add i t i on, a nd t he po r t ion of the operatine cycle durict which the addit ions were rasde.
please provide a copy of the ultrasonic test procedure and identify ecceptatice standards tollowed in the examination of austenitic steel piptog in your plant.
You should deterieine whether such procedures.
corrply with the rules of ASME Code, Section llI,Section V or Section XI and, if not, discuss the, comparability of the procedure. Also indicate the corporate af filiations and ASNT levels of the inspector
- l and the evaluator of each U.T. procedure performed.
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A netallurgical evaluation, including photomicrographa with the results of fractortaphic enslysis, and an analysis of deposits adjacent
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to, and within the crack are needed f or our review. This metallorgical evaluation should be performed on at least one crack in a pipe removed j
f rom service.
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As-built detail drawings of the pipe joints adjacent to portions of the 4" pipe in which you have reported finding cracks are requestei. All welding procedures for these pipe joints, including copies of filler metal j
chemical specification analysis and deviations, if any; heat input; number of passes; insert chemical analysis and deviations, if any; and any
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pre-or post-weld cleaning or finishing, both mechanical and chemical also are requested for our review.
Since the requested operational data should be readily available, please i
provide this information within 10 days of receipt of this letter.
The remaining requested information should be supplied as soon as possible.
You are requested to provide the above information in one signed original and thirty-nine additional copies.
This request for reneric information was approved by CAO under a blanket clearance number F-180225 (R0072); this clearance expires July 31, 1977.
l Sincerely,
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Dennis L. Ziemann, Chief Operating Reactors Branch f2 Division of Reactor Licensing
Enclosure:
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Northern States Power Company MAR 11 bl6 cc w/cnclosures:
Arthur Renquist, Esquire The Environmental Conservation Vice President - Law Libra ry Northern States Power Company Minneapolis Public Library 414 Nicollet Mall 300 Nicollet Hall Minneapolis, Minnesota 55401 Minneapolis, Minnesota 55401 Gerald Charnof f Shaw, Plitman, Potts, Trowbridge and Madden 910 - 17 t h S t ree t, N. W.
Washington, D. C.
20036 Howard J. Vogel, Esquire Legal Counsel 2750 Dean Parkway Minneapolis, Minnesota 55416 Steve Gadler, P. E.
2120 Carter Avenue St. Paul, Minnesota $5108 Mr. Daniel L. Picker Assistant City Attorney 638 City Hall St. Paul, Minnesota 55102 Ken Dzugan, Director' City of St. Paul Pollution Control Services 100 East 10th Street St. Paul, Minnesota 55108 Sandra S. Gardebring Special Assistant Attorney General Counsel for Minnesota Pollution Control Agency 1935 W. County Road B2 Roseville, Minnesota 55113 Anthony Z. Roisman, Esquire Berlin, Roisman and Kessler 1712 N Street, N. W.
Washington, D. C.
20036
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