Improving reliability of the uninterruptible power supply (UPS) inverters at Point Lepreau
Creators
- 1. New Brunswick Electric Power Commission, Fredericton, NB (Canada)
Description
In nuclear generating plants inverters are required to provide clean uninterruptible AC power to critical loads such as safety systems, computers and process control. Upon inverter failure, many systems are designed to have a static switch transfer the load, in a no-break manner, to a regulated bypass supply. Failure of the transfer can greatly increase the risk of a plant trip. Recent failures of both the inverter and transfer equipment warranted a review of system design and maintenance practices. The review findings indicated that, due to age related degradation, a number of the inverter critical components were not functioning properly. this resulted in the 'violent' failure of solid state components within the inverter. Resultant transfers to the bypass supply were not successful because noise induced spurious operation of logic permissives at that critical time. In order to increase the system reliability, the inverter components and transfer logic has been upgraded along with an improved maintenance program. (author). 3 figs
Additional details
Publishing Information
- ISBN
- 0-919307-39-6; 0-919784-17-8
- Imprint Title
- Proceedings of the 29th annual conference of the Canadian Nuclear Association and 10th annual conference of the Canadian Nuclear Society. V. 1-3
- Imprint Pagination
- 3 v. [1200 p.].
- Journal Page Range
- v. 3 p. 16.15-16.19.
- ISSN
- 0706-1293; 0227-1907
- Report number
- INIS-mf--14668
Conference
- Title
- 10. annual conference of the Canadian Nuclear Society.
- Dates
- 4-7 Jun 1989.
- Place
- Ottawa, ON (Canada).
INIS
- Country of Publication
- Canada
- Country of Input or Organization
- Canada
- INIS RN
- 27015344
- Subject category
- S22: GENERAL STUDIES OF NUCLEAR REACTORS; S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- INVERTERS; MAINTENANCE; POINT LEPREAU-1 REACTOR; POINT LEPREAU-2 REACTOR; POWER SUPPLIES
- Descriptors DEC
- CANDU TYPE REACTORS; ELECTRICAL EQUIPMENT; ELECTRONIC EQUIPMENT; EQUIPMENT; HEAVY WATER COOLED REACTORS; HEAVY WATER MODERATED REACTORS; NATURAL URANIUM REACTORS; PHWR TYPE REACTORS; POWER REACTORS; PRESSURE TUBE REACTORS; REACTORS; THERMAL REACTORS