A self-revealing
NCV of Appendix B, Criterion V, lnstructions, Procedures, and Drawings, was identified because of two unexpected trips of the
turbine trip valve (1MS52) for the 13 turbine driven
auxiliary feedwater (
TDAFW) pump. Specifically, adjustments made to the
overspeed linkage for the 13
TDAFW pump using a threaded rod, which was installed on the head lever, were not prescribed by documented procedures or drawings. These adjustments led to the increased sensitivity of the trip mechanism that resulted in the two unexpected trips. The issue was entered into the
CAP as notification 20469586.
PSEGs immediate corrective action was to remove the threaded rod from the 13
TDAFW head lever. An extent of condition inspection on the 23
TDAFW pump resulted in the removal of a threaded rod from the 23
TDAFW pump head lever. The trips of the 1MS52 valve and repairs to the
overspeed trip mechanism resulted in
41 hours4.74537e-4 days <br />0.0114 hours <br />6.779101e-5 weeks <br />1.56005e-5 months <br /> of unavailability of the 13
TDAFW pump. fn accordance with NRC
IMC 0609, Attachment 4, the inspectors performed a Phase 1
SDP screening and determined the finding was of very low safety significance (Green) because it was not a design or qualification deficiency, did not result in an actual loss of safety function, and was not potentially risk significant for external events. This finding had a cross-cutting aspect in the area of human performance, resources, because
PSEG did not ensure that complete accurate and up{o-date procedures and work packages were available and adequate to assure nuclear safety. Specifically, the procedure used to set the
overspeed trip did not address adjustment of the threaded rod. (
H.2(c))
