Pickering Nuclear 2017 Impingement Monitoring Report
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Internal Use Only Document Number: Usage Classification: Report P-REP-07263-00011 N/A Sheet Number: Revision Number: Page: N/A R000 1 of 17 Title: PICKERING NUCLEAR 2017 IMPINGEMENT MONITORING REPORT © Ontario Power Generation Inc., 2018. This document has been produced and distributed for Ontario Power Generation Inc. purposes only. No part of this document may be reproduced, published, converted, or stored in any data retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of Ontario Power Generation Inc. Pickering Nuclear 2017 Impingement Monitoring Report P-REP-07263-00011-R000 2018-04-16 Order Number: N/A Other Reference Number: Internal Use Only Prepared By: Jeff Wright Prepared By: Doug Brown Environmental Advisor Environmental Advisor Environment Programs Environment Programs Reviewed By: Concurred By: Vanessa Tang Hon Yue Ali Esmaeily Section Manager Section Manager Environment Ops Support Environment Programs Pickering Approved By: Raphael McCalla Director Environment Ops Support Nuclear N-TMP-10010-R012 (Microsoft® 2007) Internal Use Only Document Number: Usage Classification: Report P-REP-07263-00011 N/A Sheet Number: Revision Number: Page: N/A R000 2 of 17 Title: PICKERING NUCLEAR 2017 IMPINGEMENT MONITORING REPORT Table of Contents Page List of Tables and Figures ............................................................................................................. 3 Revision Summary ........................................................................................................................ 4 Executive Summary ...................................................................................................................... 5 1.0 INTRODUCTION ............................................................................................................ 6 2.0 THE FISH DIVERSION SYSTEM .................................................................................. 6 2.1 FDS Installation and Removal ........................................................................................ 6 2.2 FDS Availability .............................................................................................................. 6 3.0 IMPINGEMENT MONITORING SAMPLING PROGRAM .............................................. 8 4.0 2017 FISH IMPINGEMENT ............................................................................................ 9 4.1 Episodic Fish Impingement Event – November 16, 2017 .............................................. 9 4.2 Northern Pike ............................................................................................................... 13 4.3 Species at Risk............................................................................................................. 14 5.0 IMPINGEMENT AND ENTRAINMENT OFFSET PROJECTS .................................... 14 5.1 Fisheries Act Authorization........................................................................................... 14 5.2 Uncertainty ................................................................................................................... 14 6.0 CONCLUSION ............................................................................................................. 15 7.0 REFERENCES ............................................................................................................. 15 Appendix A: 17 N-TMP-10010-R012 (Microsoft® 2007) Internal Use Only Document Number: Usage Classification: Report P-REP-07263-00011 N/A Sheet Number: Revision Number: Page: N/A R000 3 of 17 Title: PICKERING NUCLEAR 2017 IMPINGEMENT MONITORING REPORT List of Tables and Figures Page Figure 1 Annual Cumulative Biomass (kg) of Fish Impinged in 2010 - 2017 .............................. 10 Table 1 Fraction of Time the Secondary Skirt is at the Surface .................................................... 7 Table 2 Frequency Distribution of Depth Logger Data .................................................................. 8 Table 3 Comparison of Impingement Monitoring Effort ................................................................ 8 Table 4 Biomass of Fish Impinged at Pickering NGS in 2017 .................................................... 11 Table 5 Number of Fish Impinged at Pickering NGS in 2017 ..................................................... 12 Table 6 Flow Adjusted Rate of Biomass Impinged ..................................................................... 13 Table 7 Northern Pike Impingement ........................................................................................... 13 N-TMP-10010-R012 (Microsoft® 2007) Internal Use Only Document Number: Usage Classification: Report P-REP-07263-00011 N/A Sheet Number: Revision Number: Page: N/A R000 4 of 17 Title: PICKERING NUCLEAR 2017 IMPINGEMENT MONITORING REPORT Revision Summary Revision Number Date Comments R000 2018-04-16 Initial issue. N-TMP-10010-R012 (Microsoft® 2007) Internal Use Only Document Number: Usage Classification: Report P-REP-07263-00011 N/A Sheet Number: Revision Number: Page: N/A R000 5 of 17 Title: PICKERING NUCLEAR 2017 IMPINGEMENT MONITORING REPORT Executive Summary The Canadian Nuclear Safety Commission (CNSC) has accepted the Fish Diversion System (FDS) at the Pickering Nuclear Generating Station (PNGS) as the permanent solution to reduce fish impingement during operations. In order to provide assurance that the FDS maintains the expected level of performance, the CNSC requires OPG to monitor and report annually on the biomass of fish impinged. This document is the report for 2017. The total biomass of all species and ages impinged in 2017 was 25,217 kg, which is equivalent to a rate of 4.99 kg/million m3 of station flow. The impingement reduction performance target was not met in 2017. The results in 2017 were heavily influenced by a single event starting on November 16 and lasting several days, which was reported to CNSC and DFO. During the event, a preliminary estimate of 24,000 kg of Alewife were impinged. In the absence of this event, impingement was 1,217 kg, the second lowest on record since assessment commenced in 2010. In addition, to offset residual impingement impacts, the CNSC requested OPG implement a wetland improvement project of 3 hectares. To achieve this, OPG retained the Toronto and Region Conservation Authority (TRCA) to plan and upgrade a portion of the Duffins Creek wetland. The restoration project design phase was initiated in 2015 and was deemed to require an Authorization under Section 35(2)(b) of the Fisheries Act. OPG received this Authorization from Fisheries and Oceans Canada on January 17, 2018. N-TMP-10010-R012 (Microsoft® 2007) Internal Use Only Document Number: Usage Classification: Report P-REP-07263-00011 N/A Sheet Number: Revision Number: Page: N/A R000 6 of 17 Title: PICKERING NUCLEAR 2017 IMPINGEMENT MONITORING REPORT 1.0 INTRODUCTION In 2008, the Canadian Nuclear Safety Commission (CNSC) issued a directive to the Pickering Nuclear Generating Station (PNGS) to reduce fish impingement by 80% and entrainment by 60%. A fish diversion system (FDS) consisting of a barrier net was installed in front of the PNGS intake in 2009 and was studied in 2010 to 2011 to determine it’s capability to reduce impingement (Poulton, 2011, 2012a). Study results indicated that the FDS exceeded the 80% impingement reduction target in each year. As a result, in 2012, the CNSC accepted the FDS as the permanent solution to reduce fish impingement for all species during PNGS operations (CNSC 2012a), with the exception of Northern Pike, since this species in impinged in winter months when the FDS can not be deployed. In order to provide assurance that the FDS maintained this level of performance, the CNSC required OPG to monitor and report annually on the biomass of fish impinged. This report documents observed impingement for 2017. 2.0 THE FISH DIVERSION SYSTEM A complete description of the FDS system can be found in Kinectrics (2009) and Poulton (2011). A secondary skirt was added in 2011 to further reduce fish impingement in the event the main net and primary skirt became submerged (Poulton, 2012a). PNGS replaced the net in 2017, as the former net had reached its operational lifespan. 2.1 FDS Installation and Removal In 2017, the FDS main net and the primary skirt installation were completed on May 11. Subsequent removal of the FDS was completed on November 13. No issues were reported during installation or removal of the FDS in 2017. 2.2 FDS Availability Twenty four depth loggers, recording instantaneous depth at 15 minute intervals, were installed on the FDS in 2017 to monitor retention of the float lines at surface, and by extension FDS availability. All loggers were retrieved but the reading on three were irrational (South Main Net, East Main Net and West Second Skirt North). FDS performance is deemed acceptable when the loggers on the secondary skirt are submerged at depths ranging from 10 - 30 cm. Table 1 provides a weekly summary of the availability of each FDS aspect in 2017 and indicate the secondary skirt was at the surface for the majority of time the net was deployed. As in previous years, daily visual observations of the secondary skirt by OPG security were conducted. The visual observations document if the float lines become submerged, and inform maintenance staff of net deficiencies requiring immediate corrective actions. Results of the visual observation show there were no periods