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Title: Water-hammer in the cold leg during an SBLOCA due to cold ECCS injection

Water-hammer might occur in the cold leg of pressurized water reactors (PWR) during small break loss-of-coolant accidents (SBLOCA`s), when cold emergency core cooling system (ECCS) water is injected into a pipe that may be partially filled with saturated steam. The water may mix with the steam and cause it to condense abruptly. Depending on the flow regime present, slugs of liquid may then be accelerated towards each other or against the piping structure. The possibility of this phenomenon is of concern to us because it may become a dominant phenomenon and change the character of the transient. In performing the code scaling, applicability, and uncertainty study (CSAU) on a SBLOCA scenario, we had to examine the possibility that the transient being analyzed could experience water-hammer and thus depart from the scope of the study. Two criteria for water-hammer initiation were investigated and tested using a RELAP5/MOD3 simulation of the transient. Our results indicated a very low likelihood of occurrence of the phenomenon. 8 refs., 6 figs.
Authors:
;
Publication Date:
OSTI Identifier:
10103146
Report Number(s):
EGG-M--91216; CONF-911213--17
ON: DE92003321
DOE Contract Number:
AC07-76ID01570
Resource Type:
Conference
Resource Relation:
Conference: American Society of Mechanical Engineers (ASME) annual winter meeting,Atlanta, GA (United States),1-6 Dec 1991; Other Information: PBD: [1991]
Research Org:
EG and G Idaho, Inc., Idaho Falls, ID (United States)
Sponsoring Org:
Nuclear Regulatory Commission, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; PWR TYPE REACTORS; LOSS OF COOLANT; WATER HAMMER; COMPUTERIZED SIMULATION; PROBABILITY; ECCS; REACTOR SAFETY; HEAT TRANSFER; HYDRAULICS; R CODES; VOID FRACTION 220900; 210200; REACTOR SAFETY; POWER REACTORS, NONBREEDING, LIGHT-WATER MODERATED, NONBOILING WATER COOLED