In context of Pressurized Heavy Water Reactor (PHWR) and Light Water Reactors (LWRs), consider the following statements:
1. Unlike PHWRs, LWRs use natural uranium fuel.
2. Both PHWRs and LWRs use heavy water as their coolant.
3. Both PHWRs and LWRs are primarily used for naval propulsion.

Which of the statement(s) given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1, 2 and 3
(d) None of the above

Question

In context of Pressurized Heavy Water Reactor (PHWR) and Light Water Reactors (LWRs), consider the following statements:
1. Unlike PHWRs, LWRs use natural uranium fuel.
2. Both PHWRs and LWRs use heavy water as their coolant.
3. Both PHWRs and LWRs are primarily used for naval propulsion.

Which of the statement(s) given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1, 2 and 3
(d) None of the above

ONLiNE UPSC · Accepted Answer

Statement 1 is not correct: The Pressurised Heavy Water Reactors (PHWRs) are fuelled by Natural Uranium while Light Water Reactors (LWRs) are fuelled by Low Enriched Uranium.

Statement 2 is not correct: PHWRs use heavy water (D2O) as both coolant and moderator, whereas LWRs use light water (H2O) for both purposes.

Statement 3 is not correct: LWRs are commonly used in naval propulsion (submarines and aircraft carriers). PHWRs are mainly used for civilian power generation, not naval propulsion.
Since PHWRs are not primarily used for naval propulsion, this statement is incorrect.

Nuclear Reactors

Pressurized Heavy Water Reactor (PHWR) and Light Water Reactors (LWRs)

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M Question 1	⏱ 0
In context of Pressurized Heavy Water Reactor (PHWR) and Light Water Reactors (LWRs), consider the following statements: 1. Unlike PHWRs, LWRs use natural uranium fuel. 2. Both PHWRs and LWRs use heavy water as their coolant. 3. Both PHWRs and LWRs are primarily used for naval propulsion. Which of the statement(s) given above is/are correct? (a) 1 only (b) 2 and 3 only (c) 1, 2 and 3 (d) None of the above