ANSI ASME OM CODE CASES-2015 Code Cases to OM CODE Code for Operation and Maintenance of Nuclear Power Plants.pdf
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1、ASME OM CODE CASESOM CODE CASES(FOR DIVISION 1)A Code Case is the official method of handling a reply to an inquiry when study indicatesthat the Code wording needs clarification, or when the reply modifies the existing requirementsof the Code, or grants permission to use alternative methods.ASME has
2、 agreed to publish Cases issued by the Operation and Maintenance Committeeconcerning the OM Code. Code Cases remain in effect for the applicable editions and addendauntil they are annulled. Cases are published on the ASME Web site under the OM CommitteePage at go.asme.org/OMcommittee as they are iss
3、ued.In July 2006, the Committee approved the elimination of Code Case expiration dates. Anypublished Code Case that has not been annulled and that had an expiration date that is afterJuly 2006 is not expired and may continue to be used. The following Code Cases (with simplified/shortened titles) rem
4、ain in effect and are being published without expiration dates. The latestedition of each Code Case is listed. All previous revisions are included before the latest revision.OMN-1, Revision 1 MOVsOMN-3 Safety Significance Categorization Using Risk InsightsOMN-4 Risk Insights Check ValvesOMN-6 Digita
5、l InstrumentsOMN-7 Risk Insights Pump TestingOMN-8 Control ValvesOMN-9 Pump Curve TestingOMN-10 Safety Significance Testing of SnubbersOMN-11 Risk Insights MOVsOMN-12 Risk Insights Pneumatically/Hydraulically Operated ValvesOMN-13, Revision 2 Extending Snubber Visual ExaminationsOMN-15, Revision 2 E
6、xtending Snubber Operational Readiness TestingOMN-16, Revision 1 Use of a Pump Curve for TestingOMN-17 Alternative Rules Class 1 Pressure/Safety ValvesOMN-18 Alternate Rules Pumps Tested Within 20% of Design FlowOMN-19 Alternative Upper Limit for the Comprehensive Pump TestOMN-20 Inservice Test Freq
7、uencyOMN-21 Alternative Requirements for Adjusting Hydraulic Parameters toSpecified Reference PointsSUMMARY OF CHANGESThe Code Cases affected by this edition are as follows:Page Code Case ChangeC-48 OMN-13, Revision 2 In Table 1, right column head correctedby errata to read 2011C-59 OMN-16 Fig. 1 ad
8、ded by errataC-62 OMN-16, Revision 1 Fig. 1 added by errataC-1INTENTIONALLY LEFT BLANKC-2ASME OM CODE CASESCode Case OMN-1Alternative Rules for Preservice and Inservice Testing of Active Electric Motor-Operated Valve Assembliesin Light-Water Reactor Power PlantsInquiry: What alternative rules, to th
9、ose of OM Code,Subsection ISTC, may be used for preservice and inser-vice testing to assess the operational readiness of activeelectric motor-operated valve assemblies in light-waterreactor power plants?Reply: It is the opinion of the Committee that, in lieuof the rules for preservice and inservice
10、testing to assessthe operational readiness of active electricmotor-operated valve assemblies in light-water reactorpower plants in OM Code-1995, except for leakage ratetesting, the following alternative requirements may beapplied. Electric motor-operated valves for which seatleakage is limited to a
11、specific maximum amount in theclosed position for fulfillment of their required function(Category A) must also be seat leakage rate tested inaccordance with the requirements of the OM Code.NOTE: The terms “shall consider” and “shall be considered” areused in paras. 3.6.2, 3.7.1, and 9.1 of this Code
12、 Case. The CodeCase does not dictate how the considerations in the paragraphsare implemented or documented. Users of the Code Case willdetermine the best methods based on their programs, which mayinclude procedures, checklists, training, or other methods.1 INTRODUCTION1.1 ScopeThis Code Case establi
13、shes the requirements for pre-service and inservice testing to assess the operationalreadiness of active motor-operated valves (MOVs) inlight-water reactor (LWR) power plants.The MOVs covered are those required to perform anactive function in shutting down a reactor to the safeshutdown condition, in
14、 maintaining the safe shutdowncondition, or in mitigating the consequences of anaccident.This Code Case establishes test methods, test inter-vals, parameters to be measured and evaluated, accept-ance criteria, corrective actions, and recordsrequirements.1.2 ExclusionsSee para. ISTC-1200.2 SUPPLEMENT
15、AL DEFINITIONSmotor-operated valve (MOV): a valve and its associatedelectric motor-driven mechanism for positioning theC-3valve, including components that control valve actionand provide position output signals.MOV functional margin: the increment by which anMOVs available capability exceeds the cap
16、abilityrequired to operate the MOV under design basisconditions.stem factor: the ratio of stem torque to stem thrust inrising-stem valves.full-cycleexercise: full stroke of the valve from and backto its initial position.3 GENERAL REQUIREMENTS3.1 Design Basis Verification TestA one-time test shall be
17、 conducted to verify the capa-bility of each MOV to meet its safety-related design basisrequirements. This test shall be conducted at conditionsas close to design basis conditions as practicable.Requirements for a design basis verification test arespecified in applicable regulatory documents. Testin
18、gthat meets the requirements of this Code Case but con-ducted before implementation of this Code Case maybe used.(a) Design basis verification test data shall be usedin conjunction with preservice test data as the basis forinservice test criteria.(b) Design basis verification testing shall be con-du
19、cted in situ or in a prototype test facility that dupli-cates applicable design basis conditions. If a test facilityis used, an engineering analysis shall be documentedthat supports applicability to the in situ conditions.(c) Justification for testing at conditions other thandesign basis conditions
20、and for grouping like MOVsshall be documented by an engineering evaluation, alter-nate testing techniques, or both. Where design basistesting of the specific MOV being evaluated is impracti-cable, or not meaningful (provides no additional usefuldata), data from other MOVs may be used if justifiedby
21、engineering evaluation. Sources for the data includeother plant MOVs or test data published in industrytesting programs. Where analytical techniques are usedto verify design basis capability, those techniques shallbe justified by an engineering evaluation.(d) For certain valve types (e.g., ball, plu
22、g, and dia-phragm valves) where the need for design basis verifica-tion testing has not been previously identified, anASME OM CODE CASESengineering evaluation of operating experience may beused to verify design basis capability.(e) The design basis verification test shall be repeatedif an MOV applic
23、ation is changed, the MOV is physicallymodified, or the system is modified in a manner thatinvalidates its current design basis verification testresults or data. A determination that a design basis veri-fication test is still valid shall be justified by an engi-neering evaluation, alternative testin
24、g techniques, orboth.3.2 Preservice TestEach MOV shall be tested during the preservice testperiod or before implementing inservice testing. Thesetests shall be conducted under conditions as near aspracticable to those expected during subsequent inser-vice testing. Testing that meets the requirements
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