Radiochemistry and Nuclear Chemistry self-test # 20

Comprises Chapter 20

This is a self grading test of your knowledge. It consists of 20 randomly chosen questions with single or multiple answers. The questions with single answers have round buttons and the questions with perhaps more than one correct answer have square buttons. Answer the questions by clicking on the corresponding button in the list of alternative answers. On questions with a single answer (round buttons to click on), it is only possible to mark one of the alternative answers as correct.
Grading of the completed test is automatic when you click on the button marked "GRADE MY ANSWERS" at the end of the test.
Correct answers can be read by clicking on the button having the same number as the question. You find these buttons at the end of the test. You can also refresh your memory first by jumping directly to the answer buttons and click on them to get answers and read relevant parts of the book before doing this test.
On the questions with one or more possible answers (squares to click on) only the first click on each button is recorded as an answer. Hence you must click on the reset button below the question before you can change the original answer(s). Failure to do this will probably make the answers on this question regarded as wrong in the grading process.
Please observe that your teacher may require a deeper understanding of the treated subject than reflected by this test. In case you have any valuable comments or questions regarding this self-test, explain them in an e-mail to: jol@nc.chalmers.se 

Question # 1 (One or more answers) Which of the following can be classified as pressurized water reactors?

    A) AGR
    B) BWR
    C) CANDU
    D) RBMK
    E) VVER

In case of an error in the answers above, please click on this button before making any corrections 

Question # 2 (One answer) Most PWRs have

    A) PS containment
    B) large dry containments
    C) ice condensers
    D) blow-down tubes
    E) upper dry wells

Question # 3 (One answer) PS containments all have

    A) a constant void
    B) ice condensers
    C) filtered emergency venting
    D) a very large expansion volume
    E) a wet well

Question # 4 (Answers in Tabular form) The Figure below shows a BWR offgas system. Mark corresponding letters and names in the Table below.







Charcoal absorbers
Decay volume
First decay vessel
Offgas filter
Second decay vessel


Question # 5 (One or more answers) A breeder reactor consists of some of the following parts

    A) Core
    B) Converter
    C) Kisser
    D) Blanket
    E) Hot spring

In case of an error in the answers above, please click on this button before making any corrections 

Question # 6 (One answer) In a LWR, radioactive material normally deposit on all surfaces in contact with the water in the primary system. Such deposits are normally called

    A) attachments
    B) brunch
    C) crud
    D) rust
    E) tramps

Question # 7 (One answer) Some amount of fission products is always present in the water in the primary system of a LWR, even when the fuel is intact. The source of these FP:s is

    A) asymmetric fission
    B) brown crud
    C) thorium in the water
    D) tramp uranium
    E) the water clean-up system

Question # 8 (One answer) The pH of the primary system water in LWR:s can be increased to a desirable level by adding small amounts of

    A) argon
    B) barium hydroxide
    C) helium
    D) nitrogen
    E) sodium hydroxide

Question # 9 (One or more answers) The possible fertile elements that can be used in breeding of new fuel are

    A) deuterium
    B) osmium
    C) thorium
    D) tungsten
    E) uranium

In case of an error in the answers above, please click on this button before making any corrections 

Question # 10 (One answer) Which of the following reactor concepts have the shortest "doubling time" for new fissile material?

    A) The fast breeder reactor
    B) The Th-fuelled subcritical reactor
    C) The thermal breeder reactor
    D) The "plutonium burner" reactor
    E) The converter reactor

Question # 11 (One answer) The reactor causing the Chernobyl disaster was of the

    A) AGR type
    B) BWR type
    C) FBR type
    D) PWR type
    E) RBMK type

Question # 12 (One answer) The reactors powering many western naval vessels, like nuclear submarines, are

    A) AGR:s
    B) BWR:s
    C) HPWR:s
    D) PWR:s
    E) QSAR:s

Question # 13 (One answer) The replacement of current thermal reactors by FBR:s all over the world would increase the total amount of energy available from fission of known uranium resources by a factor of at least

    A) 2
    B) 10
    C) 20
    D) 100
    E) 200

Question # 14 (One answer) Even when the fertile thorium is mixed with depleted uranium as breeding material in a thermal reactor it is always in principle possible to produce isotopically pure 233U by chemical separation methods. This is done by

    A) using a recoil separation method
    B) absorption of 233Pa on a MnO2 column
    C) milking of the 232U growing in from 232Pa
    D) isotope-selective solvent extraction
    E) precipitation of thorium fluoride

Question # 15 (One or more answers) Water in the primary system of LWR:s is radioactive because it normally contains

    A) activated corrosion products
    B) induced activity from n-irradiation of water
    C) FP:s and An:s which leak from damaged fuel pins
    D) radiolysis products from water
    E) FP:s from fission of tramp uranium

In case of an error in the answers above, please click on this button before making any corrections 

Question # 16 (One answer) The primary cooling water in a PWR is normally cleaned by withdrawing a small flow from the

    A) cooling water tower
    B) return line from the steam generator
    C) high pressure injection system
    D) turbine condenser
    E) cooling water pump seal gland

Question # 17 (One answer) Aqueous waste streams leaving a nuclear power plant are normally going into the

    A) communal waste water system
    B) cooling water outlet channel
    C) cooling tower return line
    D) nearest sewer
    E) feed water inlet line

Question # 18 (One answer) The probabilistic safety analysis of a nuclear power plant is based on a series of

    A) assumptions
    B) common mode failures
    C) event trees
    D) Monte-Carlo calculations
    E) simulations

Question # 19 (One or more answers) The solid radioactive waste from reactor operations (except fuel) is normally encapsulated in a matrix of one or more of the following materials before disposal. Which ones?

    A) Bitumen
    B) Granite
    C) Limestone
    D) Oat meal
    E) Portland cement

In case of an error in the answers above, please click on this button before making any corrections 

Question # 20 (One answer) Decontamination of the primary system of a LWR is often made by using

    A) acetic acid
    B) hydrochloric acid
    C) oxalic acid
    D) sodium hydroxide
    E) sulfuric acid

Correct answers to each question can be obtained by clicking on the corresponding button below

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(Updated 2001-08-29)