Published September 1995 | Version v1
Report Open

Report of a consultants meeting on control rod insertion reliability for WWER-1000 nuclear power plants. Extrabudgetary programme on the safety of WWER and RBMK nuclear power plants

Description

Starting from 1992, an increased drop time of control rods exceeding the design limit of four seconds has been observed in most of the operating WWER-1000 reactors in Russia and in the Ukraine. In some cases a dropped control rod became stuck in an intermediate position near the bottom of the core. In October 1994, a similar control rod problem was also observed at Unit 6 of the Kozloduy NPP. The issue of control rod insertion reliability was considered at a consultants' meeting on ''Core Control and Protection Strategy of WWER-1000 Reactors'' in April 1994. A consultants' meeting specifically focused on ''Control Rod Insertion Reliability'' was convened in Vienna in February 1995 attended by 15 international experts. The objectives of this meeting were: The exchange of international experience on problems and solutions related to anomalous control rod insertion; judgement of the safety concern of this issue for WWER-1000 reactors based on safety analyses; consideration of regulatory requirements and interim measures to continue operation in short term including modifications implemented or planned; and, status of root cause analyses and pending problems. The technical discussions were held in plenary sessions and in three working groups devoted to specific aspects of the issue. Refs, figs, tabs

Availability note (English)

MF available from INIS under the Report Number.

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Additional details

Publishing Information

Imprint Pagination
173 p.
Report number
WWER-SC--121

Conference

Title
Consultants meeting on control rod insertion reliability for WWER-1000 nuclear power plants.
Dates
20-24 Feb 1995.
Place
Vienna (Austria).

INIS

Country of Publication
International Atomic Energy Agency (IAEA)
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
28053658
Subject category
GENERAL STUDIES OF NUCLEAR REACTORS; SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Resource subtype / Literary indicator
Conference
Is Lead record
Yes
Quality check status
Yes
Descriptors DEI
CONTROL ELEMENTS; IAEA; INTERNATIONAL COOPERATION; LEADING ABSTRACT; MEMBER STATES; REACTIVITY INSERTIONS; RECOMMENDATIONS; RELIABILITY; REVIEWS; TECHNOLOGY TRANSFER; WWER-5 REACTOR;
Descriptors DEC
ABSTRACTS; COOPERATION; DOCUMENT TYPES; ENRICHED URANIUM REACTORS; INTERNATIONAL ORGANIZATIONS; POWER REACTORS; PWR TYPE REACTORS; REACTOR COMPONENTS; REACTORS; THERMAL REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS; WWER TYPE REACTORS;