Kori (South Korea)

Map of Kori

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4 PWR units; constructed by Westinghouse; with a capacity of 560, 600 and 2*900 MW; grid connection in 1977, 1983 and 1985.

Facilities in Kori

plantreactor typconstruction startoperation startshut down

Loss of shutdown cooling due to station blackout during refueling outage

"On February 9, 2012, during a refueling outage, loss of off-site power (LOOP) occurred and emergency diesel generator (EDG) 'B' failed to start while EDG 'A' was out of service for scheduled maintenance, resulting in a station blackout (SBO). Off-site power was restored 12 minutes after the SBO condition began.
The LOOP was caused by a human error during a protective relay test of the main generator. The EDG 'B' failing to start was caused by the failure of the EDG air start system. Further investigation revealed that the utility did not exercise proper control of electrical distribution configuration to ensure the availability of the Station Auxiliary Transformer (SAT) while conducting test on the Unit Auxiliary Transformer (UAT).
After restoring off-site power through the SAT, the operators eventually recovered shutdown cooling by restoring power to a residual heat removal pump. During the loss of shutdown cooling for 19 minutes, the reactor coolant maximum temperature in the hot leg increased from 37? to 58.3? (approximately 21.3? rise), and the spent fuel pool temperature slightly increased from 21? to 21.5?.
There was no adverse effect on the plant safety as a result of this event, no radiation exposure to the workers, and no release of radioactive materials to the environment. However, inconsisent with the requirements, the licensee did not report the SBO event to the regulatory body in a timely manner and did not declare the "alert" status of the event in accordance with the plant emergency plan. The licensee reported this event to the regulatory body about a month after the event had occurred.
Event date:
Thu, 2012-02-09
Event sender:

(source: http://climatesceptics.org/event/968)

Inadvertent Containment Spray of Reactor Coolant

"On 17 September 2010, during the reactor coolant system (RCS) heat-up in hot shutdown condition under commissioning test, the containment spray isolation valve was opened inadvertently. The opened valve formed the flow path through the shutdown cooling system (SCS) from the RCS to the containment spray nozzles.

Perceiving the rapid decrease of pressurizer level and pressure, the MCR operators carried out the emergency operating procedure, and manually actuated the safety injection and the containment isolation. After identifying the opened valve, the operators manually closed the valve and declared the Alert pursuant to the radiation emergency plan.

As a result of the event, about 423 tons of borated water from the RCS and the refueling water tank (RWT) sprayed into the containment.

There was no radiation exposure to the workers and no release of radioactive materials to the environment as a result of this event. The basic rating of the event was classified as Level 1. However, the event was ultimately up-rated as Level 2 taking into account the safety culture aspects identified during the investigation."

(source: http://www-news.iaea.org/news/)


Westinghouse signed Korean contracts valued at more than $350-mil to provide components, instrumentation and control equipment, and technical and engineering support services to four power reactors to be built in South Korea at two sites, Shin-Kori and Shin-Wolsong, through 2010-11.
The plants are Korea Standard Nuclear Plant Plus design, based on Westinghouse System 80 technology. The projects have a cumulative value in excess of $6-bil, Westinghouse said today. The vendor said the contracts are with Doosan Heavy Industries & Construction Company Inc and the Korea Power Engineering Inc. The plants will be owned and operated by the Korea Hydro & Nuclear Power Co (KHNP), a Korea Electric Power Corp subsidiary. KHNP will be responsible for overall project management of licensing, procurement and construction, as well as plant startup and operations.


Replacement of the two SGs at Kori-1 will be completed. The job was undertaken after about 11% of the tubes in the two SGs had been plugged and the reactor power cut to 85%.
The estimated collective dose was about 130 person-rem, far below the budget of 200 person-rem. The total volume of low-active radioactive waste (LLW) produced was projected to fill about 300 standard 200-liter drums.
Bechtel designed the Kori-1 project to remove the original Westinghouse SGs by cutting an opening into the side of the reactor building, rather than taking them out from the top.


Contamination found by inspections at the transport course to the radwaste building; Several areas such as the drainage near the radwaste storage facility were contaminated (0,5 mrad/h). The contaminated topsoil was placed in radwaste drums.