June 13, 2024 #1 Local News, Information and Event Source for the Century City/Westwood areas.

The Nuclear Energy Institute’s Thoughts on Fukushima Daiichi Nuclear Power Plant Storage

For more information from the National Energy Institute: www.nei.orgKEY FACTS
*Used nuclear fuel at the Fukushima-Daiichi plant is stored in seven pools (one at each reactor and a shared pool) and in a dry container storage facility (containing nine casks.)

*Sixty percent of the used fuel on site is stored in the shared pool, in a building separated from the reactor buildings; 34 percent of the used fuel is distributed between the six reactor fuel storage pools, and the remaining 6 percent is stored in the nine dry storage containers.

*Used fuel pools are robust concrete and steel structures designed to protect the fuel from even the most severe events. Pools are designed with systems to maintain the temperature and level of the water sufficient to provide cooling and radiation shielding.

*The water level in a used fuel pool typically is 16 feet or more above the top of the fuel assemblies.

*The used fuel pools at the Fukushima Daiichi reactors are located at the top of the reactor building for ease of handling during refueling operations.

*The used fuel pools are designed so that the water in the pool cannot drain down as a result of damage to the piping or cooling systems. The pools do not have drains in the sides or the floor of the pool structure. The only way to rapidly drain down the pool is to have structural damage of the walls or the floor. As of mid-day March 15, there is no evidence to date that this has occurred.

WHAT COULD HAPPEN DURING AN ACCIDENT?

*The systems that cool and maintain water levels in the pools are designed to withstand severe events. If these systems are unable to function, the heat generated by the used fuel would result in a slow increase in the temperature of the spent fuel pool water. The operating temperature of the pools is typically around 40 degrees C or 100 degrees F (the boiling point for water is 100 C or 212 F). This slow increase in temperature will result in an increased evaporation rate. Rapid evaporation of the water will not occur.

*Exact evaporation rates would depend on the amount of used fuel in the pool and how long it has cooled. The rate at which the pool water level would decrease (due to evaporation or mild boiling) in the absence of cooling system function would not be expected to lower water levels by more than a few percent per day. Given that there is approximately 16 feet of water above the used fuel assemblies, operators would have a few weeks to find another way to add water to the pools before the fuel would become exposed. For example, water could easily be added using a fire hose.

*If the water level decreases below the top of the fuel assembly, oxidation of the zirconium cladding could occur. This oxidation could result in some hydrogen generation. The rate of hydrogen generation depends on the temperature of the fuel assembly, with hotter temperatures leading to higher hydrogen generation rates. However, only the fuel assemblies with the least cooling time would be susceptible to this oxidation and the temperature of the fuel assemblies decreases exponentially with cooling time.

*Even if the water level in the pools was to decrease sufficiently so that the fuel were exposed to air, the same level of overheating that can occur in a reactor accident would not occur in the used fuel pool because the used fuel assemblies in the pool are cooler than the assemblies in the reactor. It is highly unlikely that used fuel temperatures could reach the point where melting could occur, although some damage to the cladding cannot be ruled out. The likelihood of cladding damage, as with hydrogen generation, decreases substantially with temperature and cooling time.

*There has been some speculation that, if the used fuel pool were completely drained, the zirconium cladding might ignite and a “zirconium fire†might occur. At the surface of the used fuel pool, the gamma dose rate from radiation emanating off the used fuel assemblies typically is less than 2 millirem per hour. If the water level decreases, the gamma radiation level would increase substantially. This increase would be noticed at the radiation monitors near the reactor buildings.

in News
Related Posts

Students for Justice in Palestine Establish Third Encampment on the UCLA Campus on June 10

June 12, 2024

June 12, 2024

UCLA Administration Calls in Four Police Groups Within Two Hours, Arrests 27 Pro-Palestinian protesters briefly established a third encampment on...

Los Angeles City Council Postpones Vote on Marilyn Monroe’s Former Home

June 12, 2024

June 12, 2024

Decision on Historic Monument Status Rescheduled for June 26  After Judge James Chalfant issued a preliminary decision on the motion...

AMC Theatres Unveils Eight Money-Saving Deals for Summer Movie Season

June 12, 2024

June 12, 2024

Enjoy Discounted Tickets, Special Promotions, and Fan Favorites at AMC If you are a movie lover who has not been...

Hang-Ten Therapeutics-Surf Therapy for Kids: Catching Waves and Finding your Calm

June 12, 2024

June 12, 2024

A different type of therapy is making waves in Los Angeles. Hang-Ten Therapeutics, founded by Naomi Matanick, a licensed pediatric...

(Video) The Opening of Pico Roots Marketplace in Santa Monica

June 12, 2024

June 12, 2024

Lots of friendly vendors with wonderful gifts, cards, clothing, decor, and coffee beans available at 1819 Pico Boulevard. @centurycitywestwoodnews The...

Tien Pham Connects Personal History with Role in Robert Downey Jr.’s “The Sympathizer”

June 11, 2024

June 11, 2024

Family’s Harrowing Escape From Vietnam Mirrors the Acclaimed HBO Max Series Vietnamese American actor-musician-producer Tien Pham finds a deep connection...

The Coffee Bean & Tea Leaf Debuts Refreshing Summer Menu with New Boba and Matcha Drinks

June 11, 2024

June 11, 2024

Enjoy Four New Beverages and Exclusive Boba Happy Hours from June 10 to June 13 The Coffee Bean & Tea...

FDA Issues Warning on Potentially Contaminated Shellfish from Oregon and Washington

June 11, 2024

June 11, 2024

Shellfish From These Areas Carries Risk of Paralytic Shellfish Poisoning The FDA has issued an alert advising consumers, restaurants, and...

(Video) Pro-Palestine Student Protesters at UCLA Set Up a Third Encampment on Monday Afternoon

June 11, 2024

June 11, 2024

UCPD and the UCLA Administration almost immediately called in UCPD, LAPD, Culver City Police Department and California Highway Patrol officers....

Pride in the Park: Love, Music, Glamour and Excitement

June 11, 2024

June 11, 2024

Photos from the Concert and Event For Pride 2024 As Pride Month marches on, 2024’s Pride in the Park, produced...

Shutters on the Beach Brings Beachside Spring Celebrations 

June 11, 2024

June 11, 2024

As spring unfurls with super blooms and sunsets after 7pm along the California coast, Shutters on the Beach emerges as the most...

In-N-Out Has Raised Prices Again, But Is It Really About Minimum Wage?

June 11, 2024

June 11, 2024

Prices at the Southland Restaurant Chain Have Been Rising for Years The prices at one of Southern California’s favorite burger...

Mar Vista Residents Alarmed by Surge in Aggressive Coyote Encounters

June 11, 2024

June 11, 2024

String of Attacks on Pets, Daily Sightings Intensify Community Concerns Coyotes are unnerving residents in Mar Vista after a series...

Hotel Casa Del Mar: The Epicenter of Springtime Diversions

June 11, 2024

June 11, 2024

Hotel Casa Del Mar stands as a beacon of vibrant coastal charm on Santa Monica Beach. Perfectly poised, the hotel’s...

(Video) Pride In the Park Performances

June 9, 2024

June 9, 2024

Jojo Siwa, Queen Priyanka, RaiNao, MUNA, Ricky Martin. @centurycitywestwoodnews Pride In the Park Performances: Jojo Siwa, Queen Priyanka, RaiNao, MUNA,...