Oracle 11g Release 2

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ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD';
CREATE TABLE table_name ( value ) AS
  SELECT TO_CHAR( DATE '2020-03-01', 'WW/YYYY' ) FROM DUAL;
1 rows affected

SELECT TO_DATE( SUBSTR( value, 4 ), 'YYYY' ) + ( SUBSTR( value, 1, 2 ) - 1 ) * 7
         AS first_day_of_week,
       TO_DATE( SUBSTR( value, 4 ), 'YYYY' ) + ( SUBSTR( value, 1, 2 ) ) * 7 - 1
         AS last_day_of_week
FROM   table_name


FIRST_DAY_OF_WEEK
LAST_DAY_OF_WEEK


2020-02-26
2020-03-03