The inspectors identified a finding of very low safety significance and an associated
NCV of
10 CFR Part 50, Appendix B, Criterion III, Design Control, when the licensee failed to maintain an accurate and up- to-date analysis of record for a postulated
HELB in th e
MSSV rooms and steam tunnels. As part of their immediate corrective actions, the licensee entered this issue into their
CAP as A R 4075641 and performed an operability evaluation. The finding was determined to be more than minor because it was associated with the
Mitigating Systems cornerstone attribute of Design Control and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to
initiating events to prevent undesirable consequences (i.e., core damage). In accordance with
IMC 0609,
Significance Determination Process, Attachment 0609.04, Initial Characterization of Findings, and Appendix A, The
Significance Determination Process for Findings At -Power, Exhibit 2,
Mitigating Systems Screening Questions, the inspectors answered Yes to Question 1, If the finding is a deficiency affecting the design or qualification of a mitigating
SSC, does the
SSC maintain its operability or functionality? because the finding did not resul t in a loss of operability or functionality. Therefore, this finding was of very low safety significance. No cross -cutting aspect was assigned to this finding as it was not reflective of current performance.
