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(51) International Patent Classification: G21C 1/08 (2006.01) G21C 15/18 (2006.01) G21C 7/32 (2006.01) 

(21) International Application Number: 

(22) International Filing Date: 

(25) Filing Language: 

(26) Publication Language: 

(30) Priority Data: 16/381,147 11 April 2019 (11.04.2019) US 

(71) Applicant: GE-HITACHI NUCLEAR ENERGY AMERICAS LLC [US/US]; 3901 Castle Hayne Road, Wilmington, North Carolina 28401 (US). 

(72) Inventors: HECK, Charles Lee; 3901 Castle Hayne Road, Wilmington, North Carolina 28401 (US). COOK, Michael M.; 3901 Castle Hayne Road, Wilmington, North Carolina 28401 (US). 

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(54) Title: USE OF ISOLATION CONDENSER AND/OR FEEDWATER TO LIMIT CORE FLOW, CORE POWER, AND PRESSURE IN A BOILING WATER REACTOR 

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PCT/US2020/024146 

23 March 2020 (23.03.2020) 

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English 

English 

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(74) Agent: YACURA, Gary D.; Harness, Dickey & Pierce, P.L.C., 11730 Plaza America Dr., Suite 600, Reston, Vir‹ ginia 20190 (US). 

(81) Designated States (unless otherwise indicated, for every kind of national protection av ailable) . AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, WS, ZA, ZM, ZW. 

(84) Designated States (unless otherwise indicated, for every kind of regional protection available) . ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, Cl, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). 

(57) Abstract: A method and apparatus of limiting power of a boiling water nuclear reactor system includes a reactor pressure vessel, a reactor core disposed in the reactor pressure vessel, a core shroud surrounding the reactor core, a downcomer region disposed between an inner surface of the reactor pressure vessel and the core shroud, a steam line connected to an upper end of es er he er ay if n‹ d 

