05000395/FIN-2012002-05
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Finding | |
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| Title | Potentially Inadequate Test Criteria for Operability Testing of the Feedwater Isolation Valves |
| Description | On March 2, 2012, during review of post maintenance test WO 1002016- 001, Post Maintenance Test of FWIVs Following Packing Adjustment, Replacement of Air Intensifier and Rebuilt Control Valves, inspectors noted that the test criteria used for stroke closure timing was not consistent with factory qualification test data taken during initial qualification of the respective air actuators where load was varied and closure time was recorded. Specifically, factory qualification tests for the actuators show closure time should be less than 1.87 seconds with no feedwater flow and 1092 psig steam generator pressure. For WO 1002016-001, operability testing of closure time was performed while the plant was in Mode 5, e.g. when there was no feedwater flow and only approximately 2.5 psig in the steam generators. However, the test acceptance criteria was 5 seconds, and the measured stroke times for the A, B and C FWIVs were 4.0, 4.1 and 4.0 seconds respectively. The inspectors also noted that non safety-related instrument air is not isolated prior to performance of the operability test. The licensee entered the concerns into their corrective action program as CR-12-00899. The prompt operability evaluation performed by the licensee indicated that the valves were operable based on FSAR 6.2.1.3.10.3.3.2 which states in part that feedline isolation may be provided by either the feedwater isolation valve or closure of both the feedwater regulating valve and the feedwater bypass control valve. The total response time of 10 seconds includes a 1.5 second instrument response time and 8.5 second valve stroke time. The inspectors will review all regulatory aspects of this concern once the evaluation is complete in CR-12- |
| Site: | Summer  |
|---|---|
| Report | IR 05000395/2012002 Section 1R19 |
| Date counted | Mar 31, 2012 (2012Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.19 |
| Inspectors (proximate) | E Coffman G Mccoy J Reecee Coffmane Lea G Mccoy J Laughlin J Reece M Coursey R Hamilton R Williamsa Alene Coffman G Mccoy J Reece M Thomas P Higgins |
| INPO aspect | |
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Finding - Summer - IR 05000395/2012002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Summer) @ 2012Q1
Self-Identified List (Summer)
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