Document: NUREG-0800
Document ID: f1b42595-bded-40aa-9d0a-68db845fc3e8
Document Type: srp
Title: MAIN STEAM SUPPLY SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350073.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.3
CFR Part: 
CFR Title: 

Content:
whip and jet impingement forces associated with pipe breaks. The essential portions of the MSSS (as identified in the above discussion) are designed Seismic Category I and housed in a Seismic Category I structure which provides protection from the effects of tornadoes, tornado missiles, turbine missiles, and floods. This meets the positions of Regulatory Guide 1.29, "Seismic Design Classification," Position C.1.a, C.1.e, C.2 and C.3 or C.1.f, C.2 and C.3; Regulatory Guide 1.115, "Protection Against Low Trajectory Turbine Missiles," Position C.1; and Regulatory Guide 1.117, "Tornado Design Classification," Appendix Positions 2 and 4. In addition, the system design capabilities should include the capability to accommodate steam hammer dynamic loads resulting from rapid closure of systems valves (including turbine bypass and stop valves), and safety/ relief valve operation without compromising required safety functions. Water entrainment considerations should include provisions for drain pots, line sloping and valve operation. Operating and maintenance procedures are to be reviewed by the applicant to alert plant personnel to the potential for such occurrences and means to minimize such occurrences. This commitment should be stated in the applicants' SAR. 10.3-9 Rev; 3 - April 1984 2. The applicant has met the requirements of GDC 5, "Sharing of Structures, Systems, and Components with Respect to the Capability of Shared Systems and Components," important to safety to perform required safety functions. We have reviewed the interconnections from the MSSS of each unit to . The interconnections are designed so that the capability to mitigate the consequences of an accident in either unit and achieve safe shutdown in that unit is retained without reducing the capability of the other unit to achieve safe shutdown. or Each unit of the plant has its own MSSS with no interconnections between the safety-related and/or nonsafety- related portions. 3. The applicant has met the