Fracture toughness requirements for protection against pressurized thermal shock events.

CFR · 2024-01-01 · US · Title 10

(a) (1) (2) (3) (4) (5) (6) (7) (8) (b) (2) The pressurized thermal shock (PTS) screening criterion is 270 °F for plates, forgings, and axial weld materials, and 300 °F for circumferential weld materials. For the purpose of comparison with this criterion, the value of RT (3) For each pressurized water nuclear power reactor for which the value of RT (4) For each pressurized water nuclear power reactor for which the analysis required by paragraph (b)(3) of this section indicates that no reasonably practicable flux reduction program will prevent RT (5) After consideration of the licensee's analyses, including effects of proposed corrective actions, if any, submitted in accordance with paragraphs (b)(3) and (b)(4) of this section, the Director, Office of Nuclear Reactor Regulation, may, on a case-by-case basis, approve operation of the facility with RT (6) If the Director, Office of Nuclear Reactor Regulation, concludes, pursuant to paragraph (b)(5) of this section, that operation of the facility with RT (7) If the limiting RT (c) (1) Equation 1 must be used to calculate values of RT (i) If a measured value of RT (ii) For generic values of weld metal, the following generic mean values must be used unless justification for different values is provided: 0 °F for welds made with Linde 80 flux, and −56 °F for welds made with Linde 0091, 1092 and 124 and ARCOS B-5 weld fluxes. (iii) (A) In Equation 2, σ (B) In Equation 2, σ (iv) ΔRT (A) (B) (v) Equation 4 must be used for determining

official document · source cfr-2024 · id 10:§ 50.61