64. The actuarial value of a pension which becomes payable to the spouse following the death of a person who is a member of the plan, established in accordance with the actuarial assumptions and methods determined by regulation, must not be less than the total of the contributions with accrued interest up to the date of death. If the actuarial value is less, the spouse’s pension shall be adjusted so that it is equal in value to the total of the contributions and interest.
The second paragraph of section 68 applies for the purpose of determining the total of such contributions.