SciTech Connect

Title: Managing water addition to a degraded core

Managing water addition to a degraded core In this paper we present information that can be used in severe accident management by providing an improved understanding of the effects of water addition to a degraded core. This improved understanding is developed using a diagram showing a sequence of core damage states. Whenever possible, a temperature and a time after accident initiation are estimated for each damage state in the sequence diagram. This diagram can be used to anticipate the evolution of events during an accident. Possible responses of plant instruments are described to identify these damage states and the effects of water addition. The rate and amount of water addition needed (1) to remove energy from the core, (2) to stabilize the core or (3) to not adversely affect the damage progression, are estimated. Analysis of the capability to remove energy from large cohesive and particulate debris beds indicates that these beds may not be stabilized in the core region and they may partially relocate to the lower plenum of the reactor vessel.
Authors: ; ;
Publication Date:
OSTI Identifier:5642843
Report Number(s):EGG-M-91375; CONF-911079--30
ON: DE92010807
DOE Contract Number:AC07-76ID01570
Resource Type:Conference
Data Type:
Resource Relation:Conference: 19. Nuclear Regulatory Commission (NRC) water reactor safety information meeting, Bethesda, MD (United States), 28-30 Oct 1991
Research Org:EG and G Idaho, Inc., Idaho Falls, ID (United States)
Sponsoring Org:NRC; Nuclear Regulatory Commission, Washington, DC (United States)
Country of Publication:United States
Language:English
Subject: 22 GENERAL STUDIES OF NUCLEAR REACTORS; NUCLEAR POWER PLANTS; REACTOR CORES; DAMAGE; CORIUM; FLUID FLOW; FUEL CANS; HEAT TRANSFER; OXIDATION; PRESSURIZATION; REACTOR SAFETY; RUPTURES; STEAM; WATER; CHEMICAL REACTIONS; ENERGY TRANSFER; FAILURES; HYDROGEN COMPOUNDS; NUCLEAR FACILITIES; OXYGEN COMPOUNDS; POWER PLANTS; REACTOR COMPONENTS; SAFETY; THERMAL POWER PLANTS 220900* -- Nuclear Reactor Technology-- Reactor Safety; 220200 -- Nuclear Reactor Technology-- Components & Accessories