《RG1.035 预应力混凝土安全壳非灌浆拉筋的在役检查 1990》由会员分享，可在线阅读，更多相关《RG1.035 预应力混凝土安全壳非灌浆拉筋的在役检查 1990（14页珍藏版）》请在金锄头文库上搜索。
1、Revision 3July 1990Inservice Inspection Of Ungrouted Tendons in Prestressed Concrete ContainmentsRegulatory Guide 1.35(TASK SC 810-4) Division Index | Regulatory Guide Index | NRC Home Page Table of Contents A. Introduction B. Discussion C. Regulatory Position D. Implementation o Regulatory Analysis
2、 A. IntroductionGeneral Design Criterion 53, Provisions for Containment Testing and Inspection, of Appendix A, General. Design Criteria for Nuclear Power Plants, to 10 CFR Part 50, Domestic Licensing of Production and Utilization Facilities, requires, in part, that the reactor containment be designe
3、d to permit (1) periodic inspection of all important areas and (2) an appropriate surveillance program. This guide describes a basis acceptable to the NRC staff for developing an appropriate inservice inspection and surveillance program for ungrouted tendons (1) in prestressed concrete containment s
4、tructures of light-water-cooled reactors.The Advisory Committee on Reactor Safeguards has been consulted concerning this guide and has concurred in the regulatory position.Any information collection activities mentioned in this regulatory guide are contained as requirements in 10 CFR Part 50, which
5、provides the regulatory basis for this guide. The information collection requirements in 10 CFR Part 50 have been cleared under 0MB Clearance No.3150-0011.B. DiscussionFollowing the issuance for public comment of the proposed Revision 3 of this regulatory guide (Task SC 810-4) and of the accompanyin
6、g proposed Regulatory Guide 1.35.1 (Task SC 807-4) in April 1979, the NRC Office of Research awarded a contract to Oak Ridge National Laboratory (ORNL). The contract work included evaluating actual inspections performed by licensees, the methods of implementing Revision 2 of this guide, and the opin
7、ions and problems of utilities, A/Es, vendors, etc., related to Revision 2 of this regulatory guide. The contractor also considered the pertinent portion of the January 1982 draft version of Inservice Inspection of Concrete Pressure Components, developed by a Working Group of ASME Section XI, in mak
8、ing final suggestions for modifying this guide. These suggestions were published in NUREG/CR-2719.(2)This guide has been revised to reflect public comments, suggestions from ORNL, and additional staff review.Regulatory Position 1provides general information on the applicability of the guide, frequen
9、cy of inservice inspections, and inspections when there are two containments at a site.Regulatory Position 2 delineates the method of determining sample size and emphasizes random sampling. If random sampling can not be assured, it is acceptable to select representative samples from between the pair
10、s of buttresses and from various heights. The samples for each inspection may be selected any time prior to the inspection. Since inspections can be performed when the plant is operating, there may be certain areas where inspection of a randomly selected tendon might result in some radiological expo
11、sure to the inspecting personnel. The position provides for substituting a readily accessible tendon for such a tendon.Regulatory Position 3 describes the areas and extent of visual examinations during each inspection.Regulatory Position 4presents the criteria for performing prestress monitoring tes
12、ts.Regulatory Position 5states the extent and scope of tendon material testing.Regulatory Position 6lists items that should be considered in the inspection of sheathing filler grease. In order to assess the potential grease leakage, a recommendation is made to compare the amount of sheathing filler
13、grease removed with that being replaced.Regulatory Position 7discusses the individual criteria for evaluating inspection results as follows:In Regulatory Position 7.1,prestress monitoring criteria have been developed to ensure that any signs of systematic tendon force degradation are detected and in
14、vestigated. Acceptance of 95% of the predicted force for two tendons out of three in Regulatory Position 7.1.3 is a slightly relaxed criterion from Revision 2 of the guide. It should be recognized, however, that the primary objective is to compare the measured tendon forces against the predicted for
15、ces at the time of the lift-off testing. Regulatory Guide 1.35.1 provides guidance on establishing the predicted forces.A provision has been added to check the average of measured forces against the minimum required force in an average (hypothetical) tendon in a group. This provision is added as a r
16、esult of a suggestion from the contractor (ORNL) and public comments. It should be recognized that each individual tendon force (measured) will have to be modified to reflect the condition of an average tendon. The contributing modifying factors would be the difference in installation forces and in the elastic shortening losses, assuming the time-dependent characteristics remain essentially the s
