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Long-time measurements of prestressed tendon forces in reactor containment, Forsmark nuclear power station, unit 1; Laangtidsmaetning av spaennkabelkrafter i reaktorinneslutning, Forsmark 1

Technical Report:

Abstract

The purpose of the measurements has been to determine the time-dependent force variation in the tendons. The measurements have now been performed during 14 years and the results are reported here. Measurements can continuously be carried out also in the future. The tendon forces are decreasing with time. The force reduction is the sum of the following three parts: stress loss due to concrete shrinkage, concrete creep and prestressing steel relaxation. The measurement results can be compared with the originally assumed long-time prestress losses. The force decrease in the tendons follow a straight line when illustrated in a diagram with logarithmic time-axis. At the distinct temperature-rise in the building when power generation started 4-5 years after prestressing this line will get a sharp bend so that the latter part of the line will have a greater slope than the former part. The prestressing force losses extrapolated to 30 years are just less than half the losses assumed in the design calculations. These favourable results from measurements during 14 years are valuable with respect to the actual structure and also to other structures of same or similar kind. The measurements have been made possible from the fact that the tendons have  More>>
Authors:
Publication Date:
Jan 25, 1991
Product Type:
Technical Report
Report Number:
SV-U-91-41
Reference Number:
SCA: 210100; PA: AIX-23:014992; SN: 92000646936
Resource Relation:
Other Information: PBD: 25 Jan 1991
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; PRESTRESSED CONCRETE; STRESSES; CABLES; CONTAINMENT; EXPERIMENTAL DATA; FORSMARK-1 REACTOR; TIME DEPENDENCE; 210100; POWER REACTORS, NONBREEDING, LIGHT-WATER MODERATED, BOILING WATER COOLED
OSTI ID:
10113208
Research Organizations:
Swedish State Power Board, Vaellingby (Sweden)
Country of Origin:
Sweden
Language:
Swedish
Other Identifying Numbers:
Other: ON: DE92615103; TRN: SE9100271014992
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
SWDN
Size:
53 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Hallbjoern, L. Long-time measurements of prestressed tendon forces in reactor containment, Forsmark nuclear power station, unit 1; Laangtidsmaetning av spaennkabelkrafter i reaktorinneslutning, Forsmark 1. Sweden: N. p., 1991. Web.
Hallbjoern, L. Long-time measurements of prestressed tendon forces in reactor containment, Forsmark nuclear power station, unit 1; Laangtidsmaetning av spaennkabelkrafter i reaktorinneslutning, Forsmark 1. Sweden.
Hallbjoern, L. 1991. "Long-time measurements of prestressed tendon forces in reactor containment, Forsmark nuclear power station, unit 1; Laangtidsmaetning av spaennkabelkrafter i reaktorinneslutning, Forsmark 1." Sweden.
@misc{etde_10113208,
title = {Long-time measurements of prestressed tendon forces in reactor containment, Forsmark nuclear power station, unit 1; Laangtidsmaetning av spaennkabelkrafter i reaktorinneslutning, Forsmark 1}
author = {Hallbjoern, L}
abstractNote = {The purpose of the measurements has been to determine the time-dependent force variation in the tendons. The measurements have now been performed during 14 years and the results are reported here. Measurements can continuously be carried out also in the future. The tendon forces are decreasing with time. The force reduction is the sum of the following three parts: stress loss due to concrete shrinkage, concrete creep and prestressing steel relaxation. The measurement results can be compared with the originally assumed long-time prestress losses. The force decrease in the tendons follow a straight line when illustrated in a diagram with logarithmic time-axis. At the distinct temperature-rise in the building when power generation started 4-5 years after prestressing this line will get a sharp bend so that the latter part of the line will have a greater slope than the former part. The prestressing force losses extrapolated to 30 years are just less than half the losses assumed in the design calculations. These favourable results from measurements during 14 years are valuable with respect to the actual structure and also to other structures of same or similar kind. The measurements have been made possible from the fact that the tendons have not been cement-grouted. They were left in their ducts with a corrosion protection of circulating dried air. (au).}
place = {Sweden}
year = {1991}
month = {Jan}
}