ISO 9001:2015 Quality management system requirements
When a nonconformity occurs, you need to react:
1.
Take steps to manage and correct what has happened. Deal with the consequenses.
2.
Evaluate the need for action to eliminate the cause of the nonconformity to prevent it from happening again.
3.
Implement necessary steps
4.
Evaluate the effects
5.
Consider to update risk assessments in the organization
6.
If necessary, do adjustments in your routines.
Byggesaksforskriften (SAK10)
According to SAK10 §10-1 d you need to have "routines for identifying, managing and closing nonconformities, including preventing repetitions of nonconformities with regard to requirements".