Databank

POSIVA Report 1996-18

Back

Name:

Sorption of Protactinium on Rocks in Groundwaters from Posiva Investigation Sites

Writer:

Seija Kulmala; Martti Hakanen; Antero Lindberg

Language:

English

Page count:

54

ISBN:

951-652-017-0; 1239-3096

Summary:

Working report: SORPTION OF PROTACTINIUM ON ROCKS IN GROUNDWATERS FROM POSIVA
INVESTIGATION SITES




Posiva Oy intends to dispose of the spent fuel produced in Finnish nuclear power plants in a
repository deep in the Finnish bedrock. For the purpose Posiva Oy selected three areas for detailed
investigations in 1992. These areas are Kivetty in Äänekoski, Romuvaara in Kuhmo and Olkiluoto
in Eurajoki. This study examines the sorption behaviour of protactinium on crushed rock and thin
section samples of rocks from these areas. In January 1997 detailed investigations will also be
initiated at Hästholmen in Loviisa.

The sorption of protactinium was high on all rocks under both oxic and anoxic conditions. The
main difference between the oxic and anoxic conditions was the solubility of the spiking solution.
The spiking solution was dried into a teflon platelet and the teflon platelet put into the sample.
Under anoxic conditions the undissolved fraction was 4.70-6.7% and under oxic conditions it was
< 1.0%.

The sorption of protactinium was lowest on Romuvaara rock samples from RO-KR5 groundwater
under anoxic conditions. The Rd values were 0.07-2.3 m3/kg. Under oxic conditions the Rd values
were 0.20-1.8 m3/kg. From KI-KR4 and OL-KR5 groundwaters under anoxic conditions the Rd
values for Romuvaara rock samples were 0.70-8.6 m3/kg and 0.35-1.7 m3/kg, respectively.

The sorption of protactinium on Kivetty and Olkiluoto rock samples was almost the same. The Rd
values for Kivetty rock samples from KI-KR4 groundwater were 0.51-1.7 m3/kg and 1.7-12
m3/kg under oxic and anoxic conditions, respectively. The corresponding Rd values for Olkiluoto
rock samples were 0.71-3.1 m3/kg and 0.31-2.4 m3/kg.
SORPTION OF PROTACTINIUM ON ROCKS IN GROUNDWATERS FROM POSIVA
INVESTIGATION SITES




Posiva Oy intends to dispose of the spent fuel produced in Finnish nuclear power plants in a
repository deep in the Finnish bedrock. For the purpose Posiva Oy selected three areas for detailed
investigations in 1992. These areas are Kivetty in Äänekoski, Romuvaara in Kuhmo and Olkiluoto
in Eurajoki. This study examines the sorption behaviour of protactinium on crushed rock and thin
section samples of rocks from these areas. In January 1997 detailed investigations will also be
initiated at Hästholmen in Loviisa.

The sorption of protactinium was high on all rocks under both oxic and anoxic conditions. The
main difference between the oxic and anoxic conditions was the solubility of the spiking solution.
The spiking solution was dried into a teflon platelet and the teflon platelet put into the sample.
Under anoxic conditions the undissolved fraction was 4.70-6.7% and under oxic conditions it was
< 1.0%.

The sorption of protactinium was lowest on Romuvaara rock samples from RO-KR5 groundwater
under anoxic conditions. The Rd values were 0.07-2.3 m3/kg. Under oxic conditions the Rd values
were 0.20-1.8 m3/kg. From KI-KR4 and OL-KR5 groundwaters under anoxic conditions the Rd
values for Romuvaara rock samples were 0.70-8.6 m3/kg and 0.35-1.7 m3/kg, respectively.

The sorption of protactinium on Kivetty and Olkiluoto rock samples was almost the same. The Rd
values for Kivetty rock samples from KI-KR4 groundwater were 0.51-1.7 m3/kg and 1.7-12
m3/kg under oxic and anoxic conditions, respectively. The corresponding Rd values for Olkiluoto
rock samples were 0.71-3.1 m3/kg and 0.31-2.4 m3/kg.

Keywords:

File(s):

Sorption of Protactinium on Rocks in Groundwaters from Posiva Investigation Sites (pdf) (628.6 KB)


Back


Share article:
This website stores cookies on your computer. These cookies are used to improve our website and provide more personalised services to you.
Close

Cookies

To make this site work properly, we sometimes place small data files called cookies on your device. Most big websites do this too.

1. What are cookies?

A cookie is a small text file that a website saves on your computer or mobile device when you visit the site. It enables the website to remember your actions and preferences (such as login, language, font size and other display preferences) over a period of time, so you don’t have to keep re-entering them whenever you come back to the site or browse from one page to another.

2. How do we use cookies?

A number of our pages use cookies to remember your actions and preferences (such as login, language, font size and other display preferences.)

Also, some videos embedded in our pages use a cookie to anonymously gather statistics on how you got there and what videos you visited.

Enabling these cookies is not strictly necessary for the website to work but it will provide you with a better browsing experience. You can delete or block these cookies, but if you do that some features of this site may not work as intended.

The cookie-related information is not used to identify you personally and the pattern data is fully under our control. These cookies are not used for any purpose other than those described here.

3. How to control cookies

You can control and/or delete cookies as you wish – for details, see aboutcookies.org. You can delete all cookies that are already on your computer and you can set most browsers to prevent them from being placed. If you do this, however, you may have to manually adjust some preferences every time you visit a site and some services and functionalities may not work.

Close