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Management of primary-to-secondary leaks at Loviisa nuclear power plant

Abstract

The Loviisa Nuclear power plant consisting of two VVER-440 type press water reactor units has been in commercial operation since the late 1970`s. Specific features for VVER-440 reactors are six primary loops with horizontal steam generators and main gate valves. The structure of the horizontal steam generators construction may cause a large primary to secondary leak in case of a break in the cover of the primary collector. An accident where two primary collector covers opened totally and two covers opened partly took place in Rovno, Ukraine January 1982. Primary to secondary leaks are one of the main contributors to the core melt frequency in VVER reactors according to the Loviisa 1 Probabilistic Safety Assessment. The high core damage contribution has set requirements for the development of effective means to cope with all sizes of primary to secondary leaks in the steam generator. A concept for all leak sizes has been developed for Loviisa 1 and 2. The solution includes four main areas which are a new steam generator leakage monitoring system based on nitrogen-16 measurement, an upgraded pressurizer spray system, an increased emergency cooling water reserve and an automated isolation of the defected steam generator.
Authors:
Mohnsen, B; Jaenkaelae, K [1] 
  1. IVO International Ltd, Vantaa (Finland)
Publication Date:
Dec 31, 1995
Product Type:
Conference
Report Number:
LTKK-TJ-43; CONF-9410509-
Reference Number:
SCA: 210200; PA: AIX-29:032368; EDB-98:066388; SN: 98001970775
Resource Relation:
Conference: 3. international seminar on horizontal steam generators, Lappeenranta (Finland), 18-20 Oct 1994; Other Information: PBD: 1995; Related Information: Is Part Of Third international seminar on horizontal steam generators; PB: 430 p.
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; LEAKS; LOVIISA-1 REACTOR; LOVIISA-2 REACTOR; PRIMARY COOLANT CIRCUITS; REACTOR ACCIDENTS; REACTOR PROTECTION SYSTEMS; RISK ASSESSMENT; SAFETY ENGINEERING; SECONDARY COOLANT CIRCUITS; STEAM GENERATORS
OSTI ID:
614746
Research Organizations:
Lappeenranta Univ. of Technology (Finland).
Country of Origin:
Finland
Language:
English
Other Identifying Numbers:
Other: ON: DE98626444; ISBN 951-763-942-2; TRN: FI9800084032368
Availability:
INIS; OSTI as DE98626444
Submitting Site:
FIN
Size:
pp. 220-225
Announcement Date:
Jun 26, 1998

Citation Formats

Mohnsen, B, and Jaenkaelae, K. Management of primary-to-secondary leaks at Loviisa nuclear power plant. Finland: N. p., 1995. Web.
Mohnsen, B, & Jaenkaelae, K. Management of primary-to-secondary leaks at Loviisa nuclear power plant. Finland.
Mohnsen, B, and Jaenkaelae, K. 1995. "Management of primary-to-secondary leaks at Loviisa nuclear power plant." Finland.
@misc{etde_614746,
title = {Management of primary-to-secondary leaks at Loviisa nuclear power plant}
author = {Mohnsen, B, and Jaenkaelae, K}
abstractNote = {The Loviisa Nuclear power plant consisting of two VVER-440 type press water reactor units has been in commercial operation since the late 1970`s. Specific features for VVER-440 reactors are six primary loops with horizontal steam generators and main gate valves. The structure of the horizontal steam generators construction may cause a large primary to secondary leak in case of a break in the cover of the primary collector. An accident where two primary collector covers opened totally and two covers opened partly took place in Rovno, Ukraine January 1982. Primary to secondary leaks are one of the main contributors to the core melt frequency in VVER reactors according to the Loviisa 1 Probabilistic Safety Assessment. The high core damage contribution has set requirements for the development of effective means to cope with all sizes of primary to secondary leaks in the steam generator. A concept for all leak sizes has been developed for Loviisa 1 and 2. The solution includes four main areas which are a new steam generator leakage monitoring system based on nitrogen-16 measurement, an upgraded pressurizer spray system, an increased emergency cooling water reserve and an automated isolation of the defected steam generator.}
place = {Finland}
year = {1995}
month = {Dec}
}