Creamy But Lean Chicken And Leeks

• 4 leeks
• 4 celery stalks (chopped)
• 2 chicken breasts (whole skinless boneless)
• 1 lemon juice of salt
• 1,400 ml chicken broth
• 40 gr long rice (grain)
• 14 gr butter
• 9 gr parsley (minced fresh)
• 1 gr thyme (dried)
• 1 gr bay leaf