ML19183A408
| ML19183A408 | |
| Person / Time | |
|---|---|
| Issue date: | 07/02/2019 |
| From: | Annette Vietti-Cook NRC/SECY |
| To: | |
| References | |
| SECY-19-0036 | |
| Download: ML19183A408 (1) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON , D.C. 20555-0001 SECRETA R Y MEMORANDUM TO: FROM:
SUBJECT:
July 2, 2019 Margaret M. Doane Executive Director for Operations Denise L. McGovern , Acting Secretary .OJ>'l\..(~
6~ STAFF REQUIREMENTS-SECY-19-0036-APPLICATION OF THE SINGLE FAILURE CRITERION TO NUSCALE POWER LLC'S INADVERTENT ACTUATION BLOCK VALVES The Commission has disapproved the staff's recommendation. The staff should review Chapter 15 of the NuScale Design Certification Application without assuming a s i ngle active failure of the inadvertent actuation block valve to close. This approach is consistent with the Commission
's safety goal policy and associated core damage and large release frequency goals and existing Commission d i rection on the use of risk-informed decision-making , as articulated in the 1995 Policy Statement on the Use of Probabilistic Risk Assessment Methods in Nuclear Regulatory Activities and the White Paper on Risk-Informed and Performance-Based Regulation (i n SECY-98-0144 and Yellow Announcement 99-019). In any licensing review or other regulatory decision , the staff should apply risk-informed principles when strict , prescriptive application of determ i nistic criteria such as the single failure criterion i s unnecessary to provide for reasonable assurance of adequate protection of public health and safety. cc: Chairman Svinicki Commissioner Baran Commissioner Caputo Commissioner Wright OGC CFO OCA OPA ODs , RAs , ACRS , ASLBP (via E-Mail) PDR