2 edition of Regulatory analysis for USI A-1, water hammer found in the catalog.
Regulatory analysis for USI A-1, water hammer
A. W Serkiz
by Division of Safety Technology, Office of Nuclear Reactor Regulation, U.S. Nuclear Regulatory Commission in Washington, D.C
Written in English
|Other titles||Regulagtory analysis for U.S.I. A-1, "water hammer"|
|Contributions||U.S. Nuclear Regulatory Commission. Office of Nuclear Reactor Regulation. Division of Safety Technology|
|The Physical Object|
|Pagination||v, 16, 9 p. :|
|Number of Pages||16|
Mechanical Engineering I National Institute of Technology Rourkela C E R T I F I C A T E This is to certify that the work in this thesis entitled “Analysis for Water Hammer considering the effect of Fluid Structure Interaction in Straight Pipes” by Suyash Mishra (ME), has been carried out under my supervision in partial fulfillment of the requirements for the. Water hammer, or the study of fluid transient behaviour, is one of the most common problems in the water engineering community. This book covers the many causes and solutions in a practical way and is an essential reference for all those concerned with the flow of liquids, not just water, in pipe systems. It follows on from the authors.
It was compiled to be used in conjunction with the book, for the Management Technical Training Course in Waterhammer Analysis. The solutions presented primarily demonstrate the methods presented in each chapter of Mr. Parmakian's book, and the answers are of slide rule accuracy. Those problems solved by other methods may be somewhat different. The pressure spike (water hammer) in a ft water pipe where the water flow velocity is reduced from 6 ft/s to 0 ft/s when a solenoid valve closes in s - can be estimated as. Δp = ((6 ft/s) - (0 ft/s)) ( ft) / ( s) = 42 0 (psi) With a closing time of 1 s (solenoid valve with damper) - the pressure spike (water hammer) can be.
Employing RELAP5 code for water hammer analysis, a very close attention must be paid to the cell (control volume) size. As it has been mentioned in previous subsection, the acoustic wave courant limit is the time required for a wave travelling at the sonic velocity to . If water is flowing through a channel and it is stopped abruptly i.e its momentum is broken so a pressure surge or wave results, this effect produced is called water hammer or hammer blow. This effect can be produced in any fluid. When a flow is stopped backwater effect is produced in which a wave of water moves against the flowing water. It is caused by a pressure or a.
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The Unresolved Safety Issue (USI) A-1 deals with safety concerns related to water hammer occurrence in nucler power plants. Since the resolution of USI A-1, an additional 40 water-hammer events have been reported (from through ).
This study was initiated by the Office for Analysis and Evaluation of Operational Data to evaluate these more» recently reported water-hammer events to assess the underlying causes and adequacy of the corrective actions taken to.
The Nuclear Regulatory Commission, protecting people and the environment. Task Action Plan Items- Item A Water Hammer (Rev. 2) () This item was originally identified in NUREG 2 and was later declared a USI in NUREG No water hammer incident resulted in the release of radioactivity outside of plants.
However, because. A.W. Serkiz, Evaluation of water hammer experience in nuclear power plants - technical finding relative to unre- solved safety issue A-l, NUREG, US Nuclear Regu- latory Commission (March ).  A.W. Serkiz, Regulatory analysis for USI A-I water hammer, NUREG, Rev.
1, US Nuclear Regulatory Comrmssion (March ). Cited by: 3. tems affected by water hammer are usually reluctant to pass on information about any surge damage suffered. But studying the photos taken of some “acci-dents” (Figs. 1-a, 1-b, 1-c) one thing is clear: the damage caused by water hammer by far exceeds the cost of preventive analysis and surge control measures.
The ability to provide reliably. INTRODUCTION This report presents the results of concluding technical evaluations relevant to Unresolved Safety Issue (USI) A-1 Water Hammer, the safety significance of this issue as currently viewed, and potential methods to minimize the frequency and severity of water hammer occurrences.
Marshall Long, in Architectural Acoustics (Second Edition), Water Hammer. Water hammer is a shock wave, usually generated by the rapid closure of a valve, but occasionally caused by a pressure wave resonance within a pipe. In the case of an isolated occurrence, it produces a violent slamming that physically moves the pipe and causes a loud banging noise.
ENCLOSURE 1 ' Arizona Public Service Company P.O, BOX ~ PHOENIX. ARIZONA WILLIAMF. CONWAY EXECUTIVEVICEPRESIDENT NUCLEAR WFC/RAB/SKiIt Novem. Water hammer, or the study of fluid transient behaviour, is one of the most common problems in the water engineering community.
This book covers the many causes and solutions in a practical way and is an essential reference for all those concerned with the flow of liquids, not just water, in pipe systems. Abstract. Water hammer in nuclear power plants is an unresolved safety issue under study by the Nuclear Regulatory Commission (NRC).
This article summarizes (1) the causes of steam generator water hammer (SGWH) events in pressurized-water reactors (PWRs), (2) various methods used to prevent or mitigate SGWH events, and (3) modifications that have been made at each operating PWR.
Background: The NRC originally addressed water hammer in Unresolved Safety Issue (USI) A-1, reviewing reported events from to The NRC considered this USI resolved with the issuance of "Evaluation of Water Hammer Occurrence in Nuclear Power Plants," NUREG, Revision 1, in March According to a Pumps and Systems article, published in August“water hammer is a pressure surge that can arise in any pumping system that undergoes an abrupt change in its rate of flow and usually results from pump starts and stops, the opening and closing of valves, or water column separation and closure.”.
NUREG Volume 3 Report of the U.S. Nuclear Regulatory Commission Piping Review Committee Evaluation of Potential for Pipe Breaks Manuscript Completed: October Hydraulic shock (colloquial: water hammer; fluid hammer) is a pressure surge or wave caused when a fluid, usually a liquid but sometimes also a gas, in motion is forced to stop or change direction suddenly; a momentum change.
This phenomenon commonly occurs when a valve closes suddenly at an end of a pipeline system, and a pressure wave propagates in the pipe. Bergant, Simpson & Sijamhodzic. Water Hammer Analysis of Pumping Systems in 13 Underground Mines where Q;_1 is the known discharge at the immediately adjacf'nt upstream section at time t-~t, Hi_ 1 is the known hydraulic grade line elevation at the in1mediately adjacent upstream section at timet-~t (Figure 1).Hp and Qp are the unknown hydraulic grade line elevation.
HAMMER is a free program I used a few years ago to simulate water hammer in a water pipe. From HAMMER read me file: HAMMER is a program which simulates the effects of water hammer in a reservoir and pipeline system in which a valve at the.
Water hammer in nuclear power plants is an unresolved safety issue under study by the Nuclear Regulatory Commission (NRC). This article summarizes (1) the causes of steam generator water hammer (SGWH) events in pressurized-water reactors (PWRs), (2) various methods used to prevent or mitigate SGWH events, and (3) modifications that have been made at each operating PWR.
Water Hammer and Transient Analysis Software Every time a pump or valve is operated, potentially dangerous transients are introduced in your water distribution or wastewater system. Unchecked, transients can have catastrophic consequences on your pipes and equipment, operators, and customers.
For some, the use of the term “water hammer” evokes images of broken and bent piping, multi-million dollar damages, the loss of water supplies to cities, and the deaths of individuals due to water hammer accidents.
Water hammer may be defined as an extreme fluid transient, occasionally recognized by loud banging, or hammering sounds. The analysis of the water hammer is done to overcome this problem from happen in the pipeline especially in hydraulic system and it needs to create a simulation circuit of the hydraulic system.These safety concerns were evaluated by the US Nuclear Regulatory Commission (NRC) in the course of resolving Unresolved Safety Issue (USI) A-1, Water Hammer.
Since the resolution of USI A-1, an additional 40 water-hammer events have been reported (from through ).water hammer can be analysed by two different approaches, rigid column theory which ignores compressibility of the fluid and elasticity of the walls of the pipe, of by full analysis including elasticity .
Water hammer effect is normally happening in daily life and only that people not realize it. .