Technical specification 5.4.1.a, states, in part, that Written procedures shall be established, implemented, and maintained for the applicable procedures recommended in
Regulatory Guide 1.33, Revision 2, Appendix A, February 1978.
Regulatory Guide 1.33, Revision 2, Appendix A, February 1978, Appendix A, Section 9, states, in part, maintenance that can affect the performance of safety related equipment should be properly preplanned and performed in accordance with written procedures. Contrary to the above, on November 1, 2011 and on March 7, 2012, the licensee failed to properly preplan and perform maintenance that can affect the performance of safety related equipment, in accordance with written procedures. Specifically, the licensee identified that in November 2011, a calculational error resulted with excess oil in the oil reservoir for the
main steam isolation valve accumulator. This excess oil would inhibit an alarm from alerting the operators of a low
nitrogen precharge pressure prior to becoming
inoperable. In March of 2012, the licensee identified that the work instructions for the calibration of the pressure transmitter for the
main steam isolation valve accumulator were inadequate to ensure the integrity of the precharge volume and caused a leak in the
nitrogen precharge system. As a result of these maintenance performance deficiencies, the
main steam isolation valve accumulator developed a
nitrogen leak that went undetected after the
accumulator was rendered
inoperable. From June 2 to June 25, 2012, train A of the
main steam isolation valve accumulator would not have been able to perform its fast closure function. The licensee immediately corrected the low precharge condition upon discovery and inspected all other
main steam isolation valves. Inspectors concluded that the finding is of very low safety-significance (Green) because it was not a design or qualification deficiency, did not result in a loss of safety function, did not result in a loss of function of a train of safety equipment out greater than its allowed outage time, or a loss of function of high importance maintenance rule equipment greater than
24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The licensee has entered the issue in the corrective action program as CRDR 4196302.
