HM Naval Base Devenport Report of Assessment of HAZARD IDENTIFICATION and RISK EVALUATION
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~~_,.~~ -. ROYAL NAVY HM Naval Base Devenport Report of Assessment of HAZARD IDENTIFICATION and RISK EVALUATION AUGUST 2017 Radiation (Emergency Preparedness & Public Information) Regulations Regulation 6 & Schedule 5 Page 1 of 19 OFFICIAL Document Approval Name Date Author Connor Ware Checker I Richard Clark ~1/o-t/rl- App_roved for I Sheila Burrows I Naval Base 1ssue Emergency ~t . ~ .R Plannina A Hd Page 2 of 19 OFFICIAL Contents 1. INTRODUCTION .................................................................................................. 4 2. REPPIR SCHEDULE 5 : PARTICULARS TO BE INCLUDED IN AN ASSESSMENT REPORT ........................................................................................... 4 2.1. CLAUSE (A)- NAME AND ADDRESS ........................................................ .4 2.2. CLAUSE (B) - POSTAL ADDRESS ............................................................. .4 2.3. CLAUSE (C)- COMMENCENT DATE .......................................................... 5 2.4. CLAUSE (D)- GENERAL DESCRIPTION .................................................... 5 2.5. CLAUSE (E)- RADIOACTIVE SUBSTANCES (OPERATOR) ...................... ? 2.6. CLAUSE (F)- RADIOACTIVE SUBSTANCES (CARRIER) .......................... 9 2.7. CLAUSE (G)- PLAN AND SITE ENVIRONS ..................................... ~ .......... 9 2.8. CLAUSE (H)- PLANT DESCRIPTION ......................................................... 9 ·2.9. CLAUSE (I)- MAJOR RELEASE ................................................................ 10 2.1 0. CLAUSE (J)- CONTINUOUS RELEASE ................................................ 11 2.11. CLAUSE (K)- UNINTENDED SELF-SUSTAINING NUCLEAR CHAIN REACTION ............................................................................................................ 11 2.12. CLAUSE (L)- MANAGEMENT SYSTEMS AND STAFFING ................... 12 2.13. CLAUSE (M)- POPULATION .................................................................. 14 2.14. CLAUSE (N) - RADIOACTIVE DISPERSAL. ........................................... 15 2.15. CLAUSE (0)- EXPOSURE ..................................................................... 16 2.16. CLAUSE (P)- REQUIREMENT FOR OPERATOR EMERGENCY PLAN 16 3. SUMMARY ......................................................................................................... 16 4. ANNEX A- HMNB DEVONPORT (NORTH YARD) .......................................... 18 5. ANNEX B- HAMOAZE AND THE SOUND ....................................................... 19 Figure 1 -Schematic of a PWR ................................................................................ 10 Figure 2 - NPW Containment. ................................................................................... 10 Table 1 - HMNB Devenport Berths ............................................................................. 6 Table 2 - Population Data ......................................................................................... 14 Table 3- Sectored Population Data (1 and 2 km) ..................................................... 15 Page 3 of 19 OFFICIAL 1. INTRODUCTION 1.1. Regulation 4 of the Radiation (Emergency Preparedness and Public Information) Regulations 2001 (REPPIR) requires a Hazard Identification and Risk Evaluation (HIRE) to be undertaken for any premises or facilities containing more than the quantity of any radionuclide specified in Schedule 2 or, in the case of fissile material, more than the mass of that material specified in Schedule 3 of Reference 1. 1.2. Regulation 5 requires a review of the HIRE to be performed within 3 years of the date of the last assessment; or when a material change occurs~n the work with ionising radiation to which an assessment made pursuant to regulation 4(1) relates. 1.3. This document is the Report of Assessment (RoA) of the HIRE for HNMB Devon port. 1.4. This RoA, together with supporting documentation, will be presented to the Office for Nuclear Regulation (ONR) to satisfy Regulations 5 and 6 of REPPIR in order to enable ONR to assess the risk to the health or safety of persons who could be affected by the work with ionising radiation undertaken at HMNB Devenport. 2. REPPIR SCHEDULE 5: PARTICULARS TO BE INCLUDED IN AN ASSESSMENT REPORT 2.1. CLAUSE (A)- NAME AND ADDRESS · The name and address of the operator or carrier; 2.1.1. Name of Operator: Naval Base Commander Devenport (NBC(D)) 2.1.2. Address of Operator: Her Majesty's Naval Base Devenport, Plymouth, Devon, PL2 2BG. 2.2. CLAUSE (B) - POSTAL ADDRESS The postal address of the premises where the radioactive substance will be processed, manufactured, used or stored, or where the facilities for processing, manufacture, use or storage exist or, in the case of transport the postal address of the transport undertaking; 2.2.1. Postal Address: Her Majesty's Naval Base Devenport, Plymouth, Devon, PL2 2BG. · Page 4 of 19 OFFICIAL 2.3. CLAUSE (C)- COMMENCENT DATE The date on which it is anticipated that the work with ionising radiation will commence or, if it has already commenced, a statement to that effect; 2.3.1. HMNB Devenport has worked with ionising radiation to provide technical, logistical and administrative support to Nuclear Powered Warships (NPW) (Nuclear Submarines) since the Early 1970s. The Naval Base provides and operates a range of the required nuclear engineering and associated nuclear support facilities for NPWs. 2.4. CLAUSE (D)- GENERAL DESCRIPTION A general description of the premises or place including the geographical location, meteorological, geological, hydrographic conditions and, where material, the history of the premises, except that in the case of transport a general description shall be given of either - (i) The starting and end points of the journeys and transhipment points, or (ii) The criteria to be used for route selection; Site purpose and Activities 2.4.1. The Devenport site which comprises the Dockyard site plus the Naval Base site, provides support and maintenance capabilities for surface ships and submarines as well as accommodation facilities for service personnel. 2.4.2. HMNB Devenport carries out the following operations in respect to the support of the NPWs and associated systems: a. Operation of the Nuclear Steam Raising Plant (NSRP). b. Movement and berthing of the vessels. c. Testing, maintenance and repair of the NSRP and associated systems. d. Lay up of Decommissioned submarines. Geographical Location 2.4.3. HM Naval Base Devenport is part of the Naval Base site. It is located within the city of Plymouth, near the border of Devon and Cornwall. The Naval Base estate encompasses approximately 740 acres, with 3.5 miles of water frontage. HM Naval Base Devenport is situated on the Hamoaze, a reach of water stretching from Saltash to the Narrows, on the East bank of the river Tamar. The River Tamar is used extensively by a range of military, commercial and leisure craft. HM Naval Base Devenport is the operating and maintenance centre for the Submarine Flotilla South (SUBFLOT (S)). This work, and hence work with ionising radiation , is concentrated in the Page 5 of 19 OFFICIAL North Yard area of the Naval Base. The adjacent dockyard carries out major refitting and refuelling of Nuclear Powered submarines. 2.4.4. Within the dockyard Port of Plymouth the MOD controls activities at the HMNB Devonport Berths and anchorages. At an 'X' Berth the activities allowed are maintenance, repair and ammunitioning. At a 'Z' Berth no nuclear related work is permftted without prior justification and Regulatory approval. Details of the HMNB Devonport berths and anchorages are provided in Table 1 below. Table- 1 HMNB Devenport Berths Berth Type Purpose 9 Wharf X (Tidal) Double Berth-Alongside. Maintenance. Ammunitioning position Lat: soc 23' 26.021 "N Long: 04c 11' 33.0S1"W 8 Wharf North X (Tidal) Double Berth-Alongside. Maintenance. Ammunitioning position Lat: soc 23' 23.1 07"N Long: 04c 11' 33.201"W , 8 Wharf X (Tidal) Double Berth-Alongside. South Maintenance. Ammunitioning position ' Lat: soc 23' 20.934"N Long: 04c 11' 29.0SS"W 7 Wharf X (Tidal) . · Double Berth-Alongside. Maintenance. Ammunitioning position Lat: soc 23' 14.892"N Long: 04 c 11' 24.368"W 'Delta' Buoy z Z Berth Anchorage Lat: soc 20' 1S.434"N Long: 04c 08' 29.21"W 'Echo' Buoy z Z Berth Anchorage Lat: soc 20' 34.318"N Long: 04 c 08' 38.31S"W Anchorage z Z Berth Anchorage 22* Lat: soc 19.22'N Long: 04c 09.29'W Anchorage z Z Berth Anchorage 23* Lat: soc 18.92'N Long: 04c L__ 09.29'W * These anchorages have never been used to berth NPWs and would require a specific safety justification in order for the anchorages to be used for this purpose · Meteorological Conditions Page 6 of 19 OFFICIAL 2.4.5. The climate of the Plymouth area is temperate maritime, with the most active weather usually occurring as depressions approach the area from the South West, bringing strong winds and heavy rain. Snow fall in the Plymouth area occurs on average 10 to 15 days per year but is only deep enough for its depth to be measured on 2 or 3 days a year. Air frosts (air temp less than 0°C) are likely to be recorded on around 20 nights between October and May. Thunder occurs approximately around 10 days per year, with a slightly higher incidence recorded betw,een May and August than for the rest of the year. Geological Conditions 2.4.6. The Devenport Site is underlain by alluvium (associated with the River Tamar) above Upper Devonian Slates. The geology indicates that the slates have a cleavage dip mainly to the south in the vicinity of the site. 2.4.7.