05000454/FIN-2015004-04
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Finding | |
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Title | Licensee-Identified Violation |
Description | On September 21, 2015, during the Unit 1 refueling outage, welders performed a modification to install a new valve on the combined discharge of the B train fuel oil transfer pumps. During the post maintenance run of the 1B diesel generator and support systems (including fuel oil), operators observed high discharge pressure on the fuel oil transfer pumps. Troubleshooting revealed the purge dam material used during the weld application had been wadded up when installed and left in the piping after the welding was complete, had wedged in the 1B diesel fuel oil day tank inlet isolation valve, 1DO005B, and blocked fuel oil flow to the day tank. Welders had assumed that the water-soluble purge dam material (referred to a rice paper) would dissolve in the fuel oil and, therefore, did not need to be removed prior to clearance order release. Several steps in CC-AA-501-1026, Exelon Nuclear Welding Program Purging Techniques, allow use of water-soluble purge dams specified by brand name in recommended applications, but step 4.5.1 specifies that if water-soluble purge dams are used, that they be flushed from the system, and step 4.5.3 assigns responsibility to the supervisor to assure, in part, that all purge materials have been removed from the system. In addition, step 4.2.5.2 states Do not wad water soluble paper purge dam materials into a pipe or tube. Work order instructions did not incorporate the information provided in CC-AA-501-1026 and the weld data sheet only specified that a dam was to be used. Failure to provide work instructions appropriate to the circumstances is a performance deficiency. Title 10 CFR 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, requires, in part, that activities affecting quality shall be documented by instruction, procedures, or drawings of a type appropriate to the circumstances and shall be accomplished in accordance with those instructions, procedures, or drawings. Contrary to the above, the work instructions included in WO 01635687 on September 21, 2015, did not include instructions appropriate to the circumstances in that the work order did not include steps to ensure that the purge dam material was removed after welding was complete. The issue was entered into CAP as IR 02559056 and the purge dam material was removed. An extent of condition review determined that other welding performed during this outage and the previous Unit 2 outage was performed in compliance with the guidance included I CC -AA-501-1026. The inspectors determined this issue was more than minor because the performance deficiency impacted the Equipment Performance attribute of the Mitigating Systems Cornerstone in that the fuel oil system was made available for service and the diesel generator was credited as available by the operating staff when, in fact, it was not available. The inspectors used IMC 0609, SDP, Appendix G, Shutdown Operations, Attachment 1, Phase 1 Operational Checklist for Both PWRs and BWRs, Checklist 2, PWR Cold Shutdown Operation, to determine that no quantitative assessment was required and that the issue was Green or very low safety significance. |
Site: | Byron ![]() |
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Report | IR 05000454/2015004 Section 4OA7 |
Date counted | Dec 31, 2015 (2015Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Licensee-identified |
Inspection Procedure: | |
Inspectors (proximate) | A Shaikh B Palagi C Thompson G Hansen J Cassidy J Draper J Jandovitz J Mcghee L Smith M Holmberg V Meghani |
Violation of: | 10 CFR 50 Appendix B Criterion V |
INPO aspect | |
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Finding - Byron - IR 05000454/2015004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Byron) @ 2015Q4
Self-Identified List (Byron)
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