ML20155F787
| ML20155F787 | |
| Person / Time | |
|---|---|
| Issue date: | 02/02/1978 |
| From: | Turovlin B Office of Nuclear Reactor Regulation |
| To: | NRC |
| Shared Package | |
| ML20155F320 | List: |
| References | |
| FOIA-97-488 NUDOCS 9811060115 | |
| Download: ML20155F787 (10) | |
Text
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, B. Turovlin 2/2/78 4
REVIEW 0F S0VIET TRANSLATED PAPERS ON STEAM GENERATOR AND SECONDARY WATER TREATMENT PROBLEMS
- 1. Paper #327-A.
The paper describes the horizontal steam generators used extensively in USSR. The generator tubes are stainless steel 18-10? The water quality standards are described. In. Unit 4 steam generator, due to a condensor leak the steam generator leaked and the steam generators were contaminated. The steam generators were " washed" with chemicals which included chelating chemicals Questions: 1. Is polishing the internal and external surfaces of the S. G. Tubes now standard practice in USSR?
- 2. What is the surface finish obtained in the tube polishing?
- 3. What is the order of improvement or reduction in.
oxide deposition due to tube polishing.
- 4. What is the chelating chemical used in chemical cleaning (washing?)ofS.G.
- 5. Can we get better drawings of the horizontal steam generators so that the tube sealing to tube sheet concept can be visualized?
- 6. How are tubes inspe'cted for leaks or wall thinning?
- 7. How are leaking tubes plugged?
- 2. Paper #327-B The paper is a historical summary of the steam generator design and water treatment. There is a good treatment of the' mechanism for the concentrating of chlorides in tube-tubesheet deposits. The paper makes a point of reconinending better hydrodynamic characteristics for steam generators, especially in regard to the flow distribution.
The paper also strongly recommends full flow filtration and deionizing treatment for the condensate and feedwater. In the USSR both vertical and horizontal design steam generators have been used. There are more horizontal design steam generators used. Questions: 1. What is the present practice in regard to removing , oxides from the steam generators after the testing l and startup period? What chemicals are used? ! I l 9811060115 981102 PDR FOIA WILLIAM 97-488 PDR 1
,/
c$Uob0IN
jw r .
- 2. What is the'present practice for-treating the steam
- generators during laysup periods? wet and dry?
- f. 3. ' What is the present practice in regard to restricting j'
the use of copper alloys in the feedwater circuit, i.e. preheaters.? l
- 4. What is the present practice of continuing operation with a condensor that has known leaks? What is the j limit of leakage in a condensor to allow continued 4
operation?
- 3. Paper #327-C i'
The paper examines the chemistry control of PWR feedwater under various 4 parameters with the assumption of condensor leakage. The chemistry .i 1 control is examined when the input leakage is from various river waters t- or sea waters in European Russia. The conclusion is that the chemistry
- i. cont'r ol is almost impossible without full flow treatment of the feed-
- water by filters and demineralizers.
a Question: 1. What is the complexone treatment? What are the chemicals j used~in this treatment?
- r > .
- 4. . Paper #327-D- ,
j' This.is a review paper relating the. rationale for the various designs i of steam generators used in Russia. The reasons for not using the j phosphate treatment and for not going to the expensive material inconel 4 600 for the tube materials'are described. (afterthefact?). A ; description..is provided of the horizontal steam generators and the 4 vertical steam' generators used in'the U.S.S.R. The reproduced
- drawings are of poor quality and have limited detail. It is difficult
{ to evaluate details that are important to the concept. J j The report reviews the difficulties inherent in the design in regard r to removing deposition by blow-down. In both the horizontal design and . the vertical design the sludge removal is impaired by the low velocity L flow of the blow-down fluids.. To overcome this difficulty a vertical , 1 steam generator design ~that eliminates the lower tube sheet was ? developed. The provided sketch is not sufficiently clear to define the contours of the tubes, tube sheet or where the tubes.end. Continous complexone treatment is to be used to reduce sludge. Questions: 1. Are there better drawings of the vertical and horizontal design steam generators available to us? Can we get drawings with greater detail of the vertical steam generator design that does not use a lower tube sheet?
- 2. Are there descriptions of the work leading to the use of' low alloy steel tubes for the steam generators?
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l USSR The I. V. Kurchatov Institute of Atomic Energy i Moscow, I. V. Kurchatov Square i l To: Mr. Victor Stello l
; Mr. Joseph D. Lefler 4
i
Dear Sirs:
I am gratefully reporting to you that I have received the materials sont me and I hope that they will be useful to our specialists. Un-for,unately, the arrival of yow letter coincided with the summer , vacation time, which explains my prolonged silence. After vacation, l I selected certain materials with the aid of our steam generator specialists and I am sending them to you. To my view the appended I articles contain the answers to the questions that interest you. Our specialists are interested in certain information on steam generators operated and planned in the USA, specifically the following: i
- the original philosophy and indices employed during standardization of the feeder and wash-out water;
- the methodological approach to analyses of the water operating regime in steam generators and in the second circuit;
- the criteria and methods of estimating the conditions of surfaces of heat exchange tubes, the critical specific contar.ination, the makeup of deposits;
- methods of removing deposits in the operating process;
-tubes; the philosophy. of selecting structural materials of the heat exchange
- the most characteristic instances of corrosion damage of steam gen-erator tubes and their causes.
,I should be happy to continue the mutually useful exchange. The appended materials: "The Aqueous-Cnemical Operating Regimes of Second l Circuits of a Nuclear Power Plant with WPR1, Methods of Maintaining and Controlling Them", " Experience in Operating Evaporation Surfaces Made of OKh1BN10T Steel in Horizontal Steam Generators of Nuclear Power
- Plants with WPR", " Optimization of the Aqueous Operating Regime of l
Second Circuits of Nuclear Power Plants with WPR", and "The Question o 4- ) I-I t
of the with Operating Reliability of Steam Generators of Nuclear Power Plants WPR". Sincerely yours, V. A. Sidorenko, Director of the ' Branch , The I. V. Kurchatov Institute of Atomic Energy e e J l 1 9 I j
~~
r . . - - V e Translator's Note
- l WPR is the probable English equivalent of the VVER in text, which generally expands to water-water power reactor.
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