ANS 5.1-2014 Decay Heat Power in Light Water Reactors (Incorporates Erratum).pdf
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1、An American National StandardPublished by the American Nuclear Society 555 N. Kensington AveLa Grange Park, IL 60526ANSI/ANS-5.1-2014 Decay Heat Powerin Light Water ReactorsANSI/ANS-5.1-2014ANSI/ANS-5.1-2014American National Standard Decay Heat Power in Light Water ReactorsSecretariatAmerican Nuclea
2、r SocietyPrepared by theAmerican Nuclear SocietyStandards CommitteeWorking Group ANS-5.1Published by theAmerican Nuclear Society555 North Kensington AvenueLa Grange Park, Illinois 60526 USAApproved November 4, 2014 by theAmerican National Standards Institute, Inc.Designation of this document as an A
3、merican National Standard attests that the principles of openness and due process have been followed in the approval procedure and that a consensus of those directly and materially affected by the standard has been achieved.This standard was developed under the procedures of the Standards Committee
4、of the American Nuclear Society; these procedures are accredited by the American National Standards Institute, Inc., as meeting the criteria for American National Standards. The consensus committee that approved the standard was balanced to ensure that competent, concerned, and varied interests have
5、 had an opportunity to participate.An American National Standard is intended to aid industry, consumers, governmental agencies, and general interest groups. Its use is entirely voluntary. The existence of an American National Standard, in and of itself, does not preclude anyone from manufacturing, m
6、arketing, purchasing, or using products, processes, or procedures not conforming to the standard.By publication of this standard, the American Nuclear Society does not insure anyone utilizing the standard against liability allegedly arising from or after its use. The content of this standard reflect
7、s acceptable practice at the time of its approval and publication. Changes, if any, occurring through developments in the state of the art may be considered at the time that the standard is subjected to periodic review. It may be reaffirmed, revised, or withdrawn at any time in accordance with estab
8、lished procedures. Users of this standard are cautioned to determine the validity of copies in their possession and to establish that they are of the latest issue.The American Nuclear Society accepts no responsibility for interpretations of this standard made by any individual or by any ad hoc group
9、 of individuals. Requests for interpretation should be sent to the Standards Department at Society Headquarters. Action will be taken to provide appropriate response in accordance with established procedures that ensure consensus on the interpretation.Comments on this standard are encouraged and sho
10、uld be sent to Society Headquarters.Published byAmerican Nuclear Society555 North Kensington AvenueLa Grange Park, Illinois 60526 USAThis document is copyright protected.Copyright 2014 by American Nuclear Society.Any part of this standard may be quoted. Credit lines should read “Extracted from Ameri
11、can National Standard ANSI/ANS-5.1-2014 with permission of the publisher, the American Nuclear Society.” Reproduction prohibited under copyright convention unless written permission is granted by the American Nuclear Society.Printed in the United States of AmericaAmerican National StandardAmerican N
12、ational Standard ANSI/ANS-5.1-2014The American Nuclear Society (ANS) Standards Committee will provide responses to inquiries about requirements, recommendations, and/or permissive statements (i.e., “shall,” “should,” and “may,” respectively) in American National Standards that are developed and appr
13、oved by ANS. Responses to inquiries will be provided according to the Policy Manual for the ANS Standards Committee. Nonrelevant inquiries or those concerning unrelated subjects will be returned with appropriate explanation. ANS does not develop case interpretations of requirements in a standard tha
14、t are applicable to a specific design, operation, facility, or other unique situation only and therefore is not intended for generic application.Responses to inquiries on standards are published in ANSs magazine, Nuclear News, and are available publicly on the ANS Web site or by contacting the ANS S
15、tandards Administrator.Inquiry requests shall include the following:(1) the name, company name if applicable, mailing address, and telephone number of the inquirer;(2) reference to the applicable standard edition, section, paragraph, figure, and/or table;(3) the purpose(s) of the inquiry;(4) the inq
16、uiry stated in a clear, concise manner;(5) a proposed reply, if the inquirer is in a position to offer one.Inquiries should be addressed toAmerican Nuclear SocietyATTN: Standards Administrator555 N. Kensington AvenueLa Grange Park, IL 60526or standardsans.orgInquiry RequestsInquiry FormatAmerican Na
17、tional Standard ANSI/ANS-5.1-2014American National Standard ANSI/ANS-5.1-2014-i-(This Foreword is not a part of American National Standard “Decay Heat Power in Light Water Reactors,” ANSI/ANS-5.1-2014.)This American National Standard provides values for the decay heat power from fission products and
18、 actinides following the shutdown of light water reactors operated with nuclear fuel consisting of uranium. The energy released in the fission process is divided into (1) prompt energy from the kinetic energy of fission fragments, neutrons, and gamma rays from prompt de-excitation of fission product
19、s and (2) delayed energy from beta particles and gamma rays emitted from the decay of fission products.The development of this standard was initiated due to the importance of energy release after reactor shutdown and the need for accurate data to evaluate fuel rod heating during a loss-of-coolant ac
20、cident. The ANS Standards Subcommittee first proposed the adoption of a new standard on decay heat power in October, 1971. Following minor revisions in 1973, it was submitted to the American National Standards Institute but remained as a draft standard. After significant technical developments based
21、 on data from new experimental programs, the draft standard was revised and approved and released as the 1979 standard. Since then, it was reaffirmed in 1985, revised in 1994, and revised again in 2005. The revisions since 1979 have been guided largely by recommendations made by Dickens, England, an
22、d Schenter on future improvements to the standard.1)A detailed technical summary of the development of the standard and revisions is provided as an Appendix to this standard.The standard prescribes methods that enable the calculation of fission product decay heat power and uncertainty with accuracie
23、s comparable to those of summation codes but without the need for complex calculations. Fission product decay heat values are provided for thermal neutron-induced fission of 235U, 239Pu, and 241Pu and fast fission of 238U. As revised, this standard provides better guidance on methods and implementat
24、ion, an improved representation of uncertainties in the fission product decay heat values, and an improved method for the neutron capture correction. Also included, for the first time, is a complete estimate of all actinide contributions to decay heat power. The changes in this revision do not alter
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