Document: NUREG-0800
Document ID: 7b7303eb-a3a7-433b-8301-fcaba03194ea
Document Type: srp
Title: - 15.1.4
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070676.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.1.1
CFR Part: 
CFR Title: 

Content:
ntory in the once-through steam generators and a relatively small pressurizer. Concerns regarding steam generator overcooling are related to the potential for loss of natural circulation due to bubble formation and the high frequency of high-pressure safety injection actuation during the transients. These transients may produce undesirable pressure/temperature conditions (pressurized thermal shock) that may cause excessive cycles of safety-related equipment, such as thermal cycling of safety injection nozzles and operation of primary system safety relief valves. A related concern is the possible overfilling of the steam generators by which water may be introduced in the steam lines, producing loads beyond the design basis. The resolution of these concerns consists of design modifications that provide for automatic auxiliary feedwater flow and steam generator level control, and main feedwater overfill protection. The resolution of Items II.E.5.1 and II.E.5.2 is contained in References 25, 26, and 27.55 For standard design certification reviews under 10 CFR Part 52, the procedures above should be followed, as modified by the procedures in SRP Section 14.3 (proposed), to verify that the design set forth in the standard safety analysis report, including inspections, tests, analysis, and acceptance criteria (ITAAC), site interface requirements and combined license action items, meet the acceptance criteria given in subsection II. SRP Section 14.3 (proposed) contains procedures for the review of certified design material (CDM) for the standard design, including the site parameters, interface criteria, and ITAAC.56 DRAFT Rev. 2 - April 1996 15.1.1-10 IV. EVALUATION FINDINGS The reviewer verifies that the SAR contains sufficient information and his that the review 57 supports the following kinds of statements and conclusions, which should be included in the staff's safety evaluation report: A number of plant transients can result in an unplanned increase in heat removal by