Most of the information must be submitted before the NOPIC is issued - before or with your NOPIC Request Form.
The actual net weight(s) for each shipment and ending inventory must be submitted near the expiry date of your NOPIC, while the NOPIC is still valid (no later than 1 week prior to expiry date). PACS will update the system with actual net weights before the NOPIC expires.
NOP will be reconciling the information it receives from US Customs. Net weight reporting (to PACS) will be the responsibility of the export-operator.
Production volume must also justify export volumes. So, operators must ensure that they have control systems in place for recording and reporting to PACS.
Frequency of reporting to PACS will depend on various factors, not limited to the frequency of your shipments, the quality of information provided, and compliance history. For higher risk operations (with poor compliance or record-keeping history) reporting will be required more frequently and NOPICs will be issued for shorter periods of time.