Human errors in ensuring the operability of standby systems

Leena Norros, Björn Wahlström

Research output: Book/ReportReport

Abstract

The study is a Finnish contribution to the project on "Human errors made in connection with maintenance" of the Nordic cooperation project on "Human reliability in complicated energy systems". In it the human factor problems in connection with the handling of standby components in nuclear power plants are discussed fron a more theoretical point if view. The study contains the following phases: (1) General psychological analysis of the test and maintenance activities, (2) Analysis of human error data in Swedish and Finnish nuclear power plants and (3) Case study at Loviisa. An attempt was made to define the particular nature of testing and maintenance activities. This would help on predicting the potential mechanisms of human errors in these activities. Three levels of analysis were separated: organizational, task, and performance control levels. In the case study typical problems were pointed out in each of them. On the basis of the qualitative and quantitative analysis of diesel generator testing human errors appear in the assessment of the status of the engine and in manipulating the engine. In particular the assessment proved to be critical. Informal organizational changes in the testing and repair units were recorded and interpreted as attempts to develop the knowledge bases for the assessment function. The positive effects of such spontaneous changes should be strenghtened through conscious measures aiming at a better integration of operation and repair. This would eventually make the acquisition of an adequate orientation basis more efficient. An enhancement in the assessment activity would promote a more productive and inspective testing style. This could be combined with partial testing rather than with mechanical regular testing. Concerning the errors in manipulating the engines (particularly during repair) the following hypothesis was formulated: Actions, that are secondary from the point of view of achieving the goal of the task, are lacking necessary feed back control and are thus prone to errors of omission. This hypothesis could, however, not be proved in this study because of lacking data of the goals and intentions of the opeators or repair men.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages50
ISBN (Print)951-38-2446-2
Publication statusPublished - 1985
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tiedotteita
Number461
ISSN0358-5085

Fingerprint

Testing
Repair
Engines
Nuclear power plants
Level control
Human engineering
Feedback control
Chemical analysis

Keywords

  • reliability
  • human errors
  • nuclear power plants
  • operability
  • maintenance

Cite this

Norros, L., & Wahlström, B. (1985). Human errors in ensuring the operability of standby systems. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tiedotteita, No. 461
Norros, Leena ; Wahlström, Björn. / Human errors in ensuring the operability of standby systems. Espoo : VTT Technical Research Centre of Finland, 1985. 50 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 461).
@book{49ba6eed60364ec99aa2d6280ff093ed,
title = "Human errors in ensuring the operability of standby systems",
abstract = "The study is a Finnish contribution to the project on {"}Human errors made in connection with maintenance{"} of the Nordic cooperation project on {"}Human reliability in complicated energy systems{"}. In it the human factor problems in connection with the handling of standby components in nuclear power plants are discussed fron a more theoretical point if view. The study contains the following phases: (1) General psychological analysis of the test and maintenance activities, (2) Analysis of human error data in Swedish and Finnish nuclear power plants and (3) Case study at Loviisa. An attempt was made to define the particular nature of testing and maintenance activities. This would help on predicting the potential mechanisms of human errors in these activities. Three levels of analysis were separated: organizational, task, and performance control levels. In the case study typical problems were pointed out in each of them. On the basis of the qualitative and quantitative analysis of diesel generator testing human errors appear in the assessment of the status of the engine and in manipulating the engine. In particular the assessment proved to be critical. Informal organizational changes in the testing and repair units were recorded and interpreted as attempts to develop the knowledge bases for the assessment function. The positive effects of such spontaneous changes should be strenghtened through conscious measures aiming at a better integration of operation and repair. This would eventually make the acquisition of an adequate orientation basis more efficient. An enhancement in the assessment activity would promote a more productive and inspective testing style. This could be combined with partial testing rather than with mechanical regular testing. Concerning the errors in manipulating the engines (particularly during repair) the following hypothesis was formulated: Actions, that are secondary from the point of view of achieving the goal of the task, are lacking necessary feed back control and are thus prone to errors of omission. This hypothesis could, however, not be proved in this study because of lacking data of the goals and intentions of the opeators or repair men.",
keywords = "reliability, human errors, nuclear power plants, operability, maintenance",
author = "Leena Norros and Bj{\"o}rn Wahlstr{\"o}m",
year = "1985",
language = "English",
isbn = "951-38-2446-2",
series = "Valtion teknillinen tutkimuskeskus. Tiedotteita",
publisher = "VTT Technical Research Centre of Finland",
number = "461",
address = "Finland",

}

Norros, L & Wahlström, B 1985, Human errors in ensuring the operability of standby systems. Valtion teknillinen tutkimuskeskus. Tiedotteita, no. 461, VTT Technical Research Centre of Finland, Espoo.

Human errors in ensuring the operability of standby systems. / Norros, Leena; Wahlström, Björn.

Espoo : VTT Technical Research Centre of Finland, 1985. 50 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 461).

Research output: Book/ReportReport

TY - BOOK

T1 - Human errors in ensuring the operability of standby systems

AU - Norros, Leena

AU - Wahlström, Björn

PY - 1985

Y1 - 1985

N2 - The study is a Finnish contribution to the project on "Human errors made in connection with maintenance" of the Nordic cooperation project on "Human reliability in complicated energy systems". In it the human factor problems in connection with the handling of standby components in nuclear power plants are discussed fron a more theoretical point if view. The study contains the following phases: (1) General psychological analysis of the test and maintenance activities, (2) Analysis of human error data in Swedish and Finnish nuclear power plants and (3) Case study at Loviisa. An attempt was made to define the particular nature of testing and maintenance activities. This would help on predicting the potential mechanisms of human errors in these activities. Three levels of analysis were separated: organizational, task, and performance control levels. In the case study typical problems were pointed out in each of them. On the basis of the qualitative and quantitative analysis of diesel generator testing human errors appear in the assessment of the status of the engine and in manipulating the engine. In particular the assessment proved to be critical. Informal organizational changes in the testing and repair units were recorded and interpreted as attempts to develop the knowledge bases for the assessment function. The positive effects of such spontaneous changes should be strenghtened through conscious measures aiming at a better integration of operation and repair. This would eventually make the acquisition of an adequate orientation basis more efficient. An enhancement in the assessment activity would promote a more productive and inspective testing style. This could be combined with partial testing rather than with mechanical regular testing. Concerning the errors in manipulating the engines (particularly during repair) the following hypothesis was formulated: Actions, that are secondary from the point of view of achieving the goal of the task, are lacking necessary feed back control and are thus prone to errors of omission. This hypothesis could, however, not be proved in this study because of lacking data of the goals and intentions of the opeators or repair men.

AB - The study is a Finnish contribution to the project on "Human errors made in connection with maintenance" of the Nordic cooperation project on "Human reliability in complicated energy systems". In it the human factor problems in connection with the handling of standby components in nuclear power plants are discussed fron a more theoretical point if view. The study contains the following phases: (1) General psychological analysis of the test and maintenance activities, (2) Analysis of human error data in Swedish and Finnish nuclear power plants and (3) Case study at Loviisa. An attempt was made to define the particular nature of testing and maintenance activities. This would help on predicting the potential mechanisms of human errors in these activities. Three levels of analysis were separated: organizational, task, and performance control levels. In the case study typical problems were pointed out in each of them. On the basis of the qualitative and quantitative analysis of diesel generator testing human errors appear in the assessment of the status of the engine and in manipulating the engine. In particular the assessment proved to be critical. Informal organizational changes in the testing and repair units were recorded and interpreted as attempts to develop the knowledge bases for the assessment function. The positive effects of such spontaneous changes should be strenghtened through conscious measures aiming at a better integration of operation and repair. This would eventually make the acquisition of an adequate orientation basis more efficient. An enhancement in the assessment activity would promote a more productive and inspective testing style. This could be combined with partial testing rather than with mechanical regular testing. Concerning the errors in manipulating the engines (particularly during repair) the following hypothesis was formulated: Actions, that are secondary from the point of view of achieving the goal of the task, are lacking necessary feed back control and are thus prone to errors of omission. This hypothesis could, however, not be proved in this study because of lacking data of the goals and intentions of the opeators or repair men.

KW - reliability

KW - human errors

KW - nuclear power plants

KW - operability

KW - maintenance

M3 - Report

SN - 951-38-2446-2

T3 - Valtion teknillinen tutkimuskeskus. Tiedotteita

BT - Human errors in ensuring the operability of standby systems

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Norros L, Wahlström B. Human errors in ensuring the operability of standby systems. Espoo: VTT Technical Research Centre of Finland, 1985. 50 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 461).