Development of a Diagnosis System for a Boiling Water Reactor

Murata, F.; Kato, Katsuji; Tomizawa, F.; Sumida, Isao

doi:10.13182/nt79-a32244

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…Then the conductivity of acidic solutions can be expressed by the following approximated equation: ( 2) where AH is the equivalent ionic conductivity of H+ (~tS·cm 2 /mol) and CH the concentration of H+ (mol/1). Taking the logarithm of both sides of Eq.…”

Section: Diagnosis Function For Identification Of Anomaly Cause Inmentioning

confidence: 99%

Structural Material Anomaly Detection System Using Water Chemistry Data, (IV)

Asakura

Nagase

Uchida

et al. 1990

Journal of Nuclear Science and Technology

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A conception of the advanced water chemistry diagnosis system for detection of anomalies and preventive maintenance of system components is proposed. Extension of anomaly diagnosis knowledge and more reliable water chemistry data are indispensable to the advanced system. Then, correlations between water chemistry (conductivity and pH) change in reactor water and anomaly occurrence in the components of the feed water line are analyzed theoretically. These correlations are verified as applicable to extension of the diagnosis knowledge for anomalies in the components of the feed water line, such as resin intrusion, sea water leakage at the condenser, and a breakdown in ion exchange capacity of resin at the condensate demineralizer.

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Section: Diagnosis Function For Identification Of Anomaly Cause Inmentioning

confidence: 99%

Structural Material Anomaly Detection System Using Water Chemistry Data, (IV)

Asakura

Nagase

Uchida

et al. 1990

Journal of Nuclear Science and Technology

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show abstract

“…In order to check the soundness of the condenser outlet conductivity sensor, the ratio of tC obtained from Eq. ( 2) to the measured value was evaluated as shown in Fig. 4.…”

Section: Early Detection Of Sea Watermentioning

confidence: 99%

Structural Material Anomaly Detection System Using Water Chemistry Data, (V)

Asakura¹,

Nagase²,

Uchida³

et al. 1990

Journal of Nuclear Science and Technology

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A water chemistry diagnosis model was developed which quantitatively evaluates ionic impurity behavior in case of equipment nonconformity or operating condition change by ana· lyzing the conductivity change along with the coolant flow in the primary cooling system in BWRs. The model propriety was evaluated using water chemistry data of the Tokai-2 plant.In the case of a sea water in-leak at the main condenser, the sea water in-leak flow rate of 31/h was the lower detection limit when searching for the leakage location in a condenser tube so as to repair it. The prediction trend of the reactor water conductivity agreed with the measured one within ± 10% error in the case of the CUW flow rate transient. The conductivity increase in the reactor obtained by conductivity balance evaluation was approximately found to correspond to the small chromate ion release rate from structural materials and it could be put to practical use as an index to understand the generation behavior of ionic impurity in the reactor.

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Development of a Diagnosis System for a Boiling Water Reactor

Cited by 2 publications

References 2 publications

Structural Material Anomaly Detection System Using Water Chemistry Data, (IV)

Structural Material Anomaly Detection System Using Water Chemistry Data, (IV)

Structural Material Anomaly Detection System Using Water Chemistry Data, (V)

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