05000456/FIN-2009005-04
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Finding | |
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Title | Possible Failure To Follow Stroke Time Test Procedure |
Description | The inspectors identified a Green finding and an associated NCV of 10 CFR 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, related to Post Maintenance Testing (PMT). Specifically, the licensee failed to follow maintenance procedures and work instructions thus work that could have affected the operability of safety-related SX Return Isolation Valve from the Auxiliary Feed Water Diesel Heat Exchanger was completed and the system returned to operable status without completing the necessary PMT. On November 12, 2009, following the completion of the Unit 2 RFO, the licensee performed a scheduled stroke time test for Valve 2SX178 (SX Return Isolation Valve from the Auxiliary Feed Water Diesel Heat Exchanger). The stroke time exceeded the alert limit and was nearly double the expected time. Since the valve had been satisfactorily stroke time tested on October 27, 2009, the inspectors questioned why the stroke time had increased in such a short period of time. The October 27, while the unit was shut down, stroke time of the valve was scheduled to be completed in accordance with Work Order 1133366-01. The work order included two tasks. Task 1 was to perform a flowscan of the valve and Task 2 was to complete a PMT stroke time test following the flowscan. Since the process of performing a flowscan can affect the time it takes for a valve to stroke, it is necessary to verify stroke times after completion of the flowscan. Specifically, Procedure MA-AA-716-012, Post Maintenance Testing, Revision 11, requires that a PMT shall be performed following any corrective and some preventive maintenance activities on plant equipment that may have impacted the equipments ability to perform its intended function. During the review of this matter, the inspectors noted the following three issues: 1. Task 1 of Work Order 1133366-01, the flowscan, was completed on October 28 and Task 2 of the Work Order, the stroke time test, was completed on October 27. Therefore, the PMT was not performed following completion of an work activity as required by Procedure MA-AA-716-012. 2. The stroke time test procedure had previously been modified due to a temporary modification that changed the valve opening logic. Maintenance performed during the RFO, prior to completion of WO 1133366-01, eliminated the need for the temporary modification. The temporary modification was removed on October 14, 2009, but the procedure for stroke time testing the 2SX178 valve was not revised. Therefore, the test procedure used on October 27 and initially on November 12 was not appropriate for the plant configuration after the temporary modification was removed. Furthermore, this was the reason for the test results of a stroke time in excess of the alert limit, as was found on November 12. 3. The test procedure in place on October 27 was not appropriate for the plant configuration after the temporary modification was removed. If followed properly, it should have resulted in a stroke time in excess of the alert limit, as was found on November 12. Therefore, the licensee apparently did not follow the stroke time test procedure during the RFO. Once discovered, the licensee revised the stroke time test procedure and re-performed the test satisfactorily. At the completion of the inspection period, the licensee was performing an Apparent Cause Evaluation to determine why the procedure was not revised and how operators used the procedure to time the valve stroke on October 27. Pending on the review of the licensees evaluation, the issue related to not following the stroke time test procedure is considered an URI. (URI 05000457/2009005-04 |
Site: | Braidwood ![]() |
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Report | IR 05000456/2009005 Section 1R19 |
Date counted | Dec 31, 2009 (2009Q4) |
Type: | URI: |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.19 |
Inspectors (proximate) | A Garmoe B Dickson B Metrow B Palagi J Gall M Holmberg M Mitchell M Perry R Jickling R Ng R Skokowskij Benjamin T Go M Perry A Garmoe R Skokowski C Scott S Bakhsh V Meghani C Lip |
INPO aspect | |
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Finding - Braidwood - IR 05000456/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2009Q4
Self-Identified List (Braidwood)
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