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2.1.3 Hazard Mitigation Analysis Findings <br />The following table provides a summary of findings from the HMA performed in fulfillment <br />of NFPA 855 section 4.2.1 and IFC section 1207.1.4.1 and California Fire Code.Detailed <br />descriptions of fault conditions specified per NFPA 855,IFC and California Fire Code are <br />provided in subsequent sections. <br />Table 2 –Summary of Hazard Mitigation Analysis Findings <br />Requirement Comment <br />A thermal runaway failure condition in a <br />Battery 6618 battery module of the <br />Enclosure B160 <br />Both passive and active measures are <br />implemented to reduce the potential of a <br />thermal runaway event from occurring <br />including quality control procedures <br />during cell manufacture,use of UL 1973 <br />listed batteries and use of a BMS to <br />maintain cells in defined operating <br />ranges.Cascading thermal runaway <br />beyond the initiating module was not <br />observed in UL 9540A testing. <br />Failure of the Battery 6618 battery <br />management system (BMS) <br />A failure of the Battery 6618 BMS will <br />result in disconnection of the batteries <br />from the rectifier charging system and the <br />load equipment,effectively isolating the <br />battery cells according to fault failures in <br />UL1973 testing. <br />In the event of a failure of BMS,the <br />Controller 6610 communication module <br />will transmit alarms to a 24/7 staffed <br />Network Operations Center (NOC).The <br />NOC has the capability to alert the <br />system owner and service personnel to <br />abnormal conditions. <br />Passive and active electrical fault <br />protections are provided at multiple <br />levels,as described in respective sections <br />of this report. <br />Confidentiality Class External Confidentiality Label Document Type Page <br />Ericsson Internal Analysis 11 (27) <br />Prepared By (Subject Responsible)Approved By (Document Responsible)Checked <br />ERATLEN Thomas Lennholm <br />Document Number Revision Date Reference <br />1785-BFM 107 220/1 Uen PA2 2025-06-03