Issue Date: 1/17/02
NRC Inspection Manual IIPB
INSPECTABLE AREA: | Post-Maintenance Testing |
CORNERSTONE: | Mitigating Systems (90%) Barrier Integrity (10%) |
INSPECTION BASIS: | Inadequate maintenance activities that are not detected prior to returning the equipment to service can result in a significant increase in unidentified risk for the subject system. This inspectable area verifies aspects of the mitigating system and barrier integrity cornerstones not measured by performance indicators. |
LEVEL OF EFFORT: | Review 20-28 post-maintenance testing activities in a year. Although the number of required samples is an annual goal, available post maintenance testing (PMT) samples should be inspected each quarter to ensure a reasonable distribution throughout the year. For multi unit sites, attempts should be made to evenly balance the PMT samples between each unit on site. Where special conditions or circumstances warrant, such as unit specific PMT deficiencies, deviations from evenly balanced PMT samples may be appropriate. |
01.01 | This inspection will verify that the post-maintenance test procedures and test activities are adequate to verify system operability, and functional capability. |
02.01 | Inspection Planning. Select post-maintenance testing activities each calendar quarter that affect risk significant systems or components. Sufficient preparation time should be devoted to reviews of deficiency identification and maintenance documents, and discussions with plant personnel to understand the scope and details of the maintenance activity performed. If any risk significant systems or components have a recent record of performance problems and the maintenance activities performed are complex in nature, then preferentially select post-maintenance testing activities that affect those systems or components |
02.02 | Inspection Activity |
a. For each testing activity selected, identify the affected system(s) and/or component(s), and: | |
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b. Either witness the test and/or review the test data, to verify that: | |
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Note: As a minimum, perform a review of the completed test procedure and the recorded data. However, for most inspection samples the inspector should also attend the prejob briefing, witness the test when it's performed, and attend any post-test critiques, as applicable. |
02.03 | Problem Identification and Resolution |
Verify that the licensee is identifying post-maintenance testing problems at an appropriate threshold and entering them in the corrective action program. For a sample of significant post-maintenance test problems documented in the corrective action program, verify that the licensee has identified and implemented appropriate corrective actions. See Inspection Procedure 71152, "Identification and Resolution of Problems," for additional guidance. |
Cornerstone | Inspection Objective | Risk Priority | Example |
Mitigating Systems
Barrier Integrity |
Identify any system, credited by the licensee as operable or available, which is adversely impacted by failure to adequately test, realign, or remove test equipment after maintenance. | Select activities
with potential for
common mode
failures and
activities where
there is a recent
record of
maintenance &
testing errors.
Select activities across technical disciplines [electrical, mechanical, I&C] Select activities that are more difficult to test at power. |
Post maintenance
testing of:
on-line emergency diesel generator engine repairs newly installed electrical/instr-umentation components that control integrat-ed multiple systems, for example LOOP/LOCA circuits containment air lock leakage |
The annual resource expenditure for this inspection procedure is estimated to be 71 to 97 hours to review post-maintenance testing activities at a site regardless of the number of reactor units at that site.
Inspection of the minimum sample size will constitute completion of this procedure in the Reactor Programs Systems (RPS). That minimum sample size will consist of 20 post-maintenance testing activities in a year regardless of the number of reactor units at the given site.
Inspection Procedure 71111.12, "Maintenance Rule Implementation"
Inspection Procedure 71111.13, "Maintenance Risk Assessments and Emergent Work Control"
Inspection Procedure 71152, "Identification and Resolution of Problems"
END