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ASME OM Code Meeting Notes - June 2005

Site Updates


Prepared By:  Ron Lippy

Company:  True North Consulting

Meeting Dates:  June 6, 7, & 8, 2005

Meeting Location:  San Diego, California

Meeting Notes

Main Committee Comments


1.    Major deliverable is to issue OMN-1 Rev. 1and incorporate into OM Code (Appendix III).


2.    Discussion of Richardson Letter of 1991—Primarily established path for OM Code:

a.  OM Code is NOT an “operability” document

b.  OM Code is NOT a “system” code

c.  OM Code IS an “operational readiness” determination code

d.  OM Code IS a “component” code




1.    Code Case for MOVs (OMN-1) and AOVs (OMN-12) upon being incorporated into OM Code—May revise Valve Categories. (A, A/C, C and D).


2.    Evaluation of “Rapid Acting” Valves and criteria for determination or acceptance criteria in progress.  In particular the determination of acceptance criteria associated with valves with stroke times <5 seconds.


3.    Evaluation of revision to ISTC-1300 for exclusions to ADS valves to include exercising.


4.    Code Case revision to OMN-8 (Control Valves with Safety Function) for “applicability”.


5.    Evaluating definitions in ISTA, in particular “test interval”.  Inquiry submitted.


6.    Clarification of Category A, A/C valves regarding determination. (gross leakage vs. leakage to satisfy valve safety function).




1.    Inquiry on replacement of impeller (per OM-6) requirements regarding re-establishing reference values.—Pump curve is NOT required by Code for this edition.


2.    Inquiry on two instruments being used for suction and discharge pressure being considered an “instrument loop” and requiring calculation of square root sum of the squares to determine overall accuracy.—The instruments are considered individual and are NOT instrument loops.


3.    Changes to ISTB-6200(a), (b) and (c) to allow analysis for pumps in Alert Range in lieu of doubling frequency.


4.    Consideration of “design flow” definition regarding CPT.


5.    Evaluating using Group A tests for Group A pumps in lieu of CPT.


6.    OMN-6 Code Case (Digital Instruments) being revised for applicability to later Codes.


7.    Code Change being initiated to change ISTB- from 70% range to 90% range.




1.    FINALLY—ISTD and Section XI interface has been completed to remove IWF-5000 (and other associated subarticles of Section Section XI, regarding snubber exams) and reference to OM Code ISTD.


2.    OMN-13, (Visual Examination of Snubbers)—Code Case is undergoing “word smithing” and clarification of extension of snubber intervals and actions to be taken as a result of failures of maximum number of snubber visual exams regarding the “re-establishment” of visual exam intervals.— Ballot Closes 6/13/05.


3.    OMN-15, (Extension of Test Intervals for snubbers).  Rev. 1 initiated to “clarify” formula used in Code Case. NRC has recent concerns and will involve additional discussions with Subgroup ISTD.


4.    Evaluating method of retention of historical data/papers (also for other subgroups).


Next SNUG meeting (Summer Conference) scheduled for week of July 18, 2005 in Cheyenne, Wyo. at the Plains Hotel.  Winter Conference scheduled for February 2006 at Radisson Hotel in Myrtle Beach, S.C.




1.    Effort to issue DRAFT Final Rule to endorse 2004 edition of OM Code, Section III and Section XI—No date for issuance yet.


2.    Effort to issue RG 1.84, RG 1.193, 1.147 revision by July/August 2005. RG 1.192 revision will follow.

a.  Code Case OMN-13 Approved

b.  Code Case OMN-15 Not Approved


3.    10 CFR 50.69 Issued


4.    10 CFR 50.46c :(ECCS Rule)—Option

a.  Provides a distinction between break size and determines “transition break size” for PWRs (14”) and BWRs (20”). Dependent upon size of break; if less than “transition break size”  use Appendix K, if greater, single failure is eliminated and take credit for non-safety related equipment.




China/Korea are using certain OM standards (OM-2, OM-7, etc).


OM-22 (Check Valves)


1.    NIC—Looking at position paper on NIT qualifications, tracking and trending guide.


2.    NRC is looking at previous RRs to determine if changes to Code needed or additional guidance/changes to ISTC.


3.    Working on Code Change to allow “on-line” disassembly and inspection of check valves.—Should go to MC within 3 months.


4.    Clarification on using “historical” info and past test results for CMP of check valves.


5.    OMN-4 is being updated to applicability of later Codes.


Diesel Group


1.    Developing matrix for comparing parameters requiring monitoring with Tech Spec requirements


2.    Evaluating multiple reporting requirements for “consolidation” of NRC, NEI, INPO, Maint. Rule, etc.,

a.  Unavailability

b.  Reliability




1.    Appendix V? for AOV testing using performance monitoring techniques is being revised—Should go to MC for review 10/05.


Relief Valves (Appendix I)


1.    Temperature Range for testing RVs


2.    Inquiry responded to state that 1 RV in group must be tested at least once every 48 months.




1.    Subsection for ISTE to be issued for comments soon


2.    New Appendices to OM Code—Tentative Numbers for Appendices

a.  OMN-1 (MOVs)—Appendix III

b.  OMN-12 (RI Testing AOVs)—Appendix IV

c.  AOV Testing (Performance Monitoring)—Appendix V


Pump Performance Group developing


1.    Test Effectiveness Matrix


2.    FMEA


3.    Lube Oil Analysis


4.    Spectral Analysis (Vibrations)


Special Committee Standards Planning


1.    RISC Pumps and Valves to have new Subgroup (10 CFR 50.69.


2.    Requirements for Appendix J (Type A)—ON Hold


3.    Condition Monitoring of Rotating Equipment


4.    Reactor Recirc/Coolant Pumps Shaft cracking—Encourage use of OM-24.

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