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NUCLEAR BIOLOGICAL AND CHEMICAL PROTECTION

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RULES FOR CLASSIFICATION OF HIGH SPEED, LIGHT CRAFT AND NAVAL SURFACE CRAFT SPECIAL EQUIPMENT AND SYSTEMS ADDITIONAL CLASS PART 6 CHAPTER 10 NUCLEAR BIOLOGICAL AND CHEMICAL PROTECTION JANUARY 2011 CONTENTS
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RULES FOR CLASSIFICATION OF HIGH SPEED, LIGHT CRAFT AND NAVAL SURFACE CRAFT SPECIAL EQUIPMENT AND SYSTEMS ADDITIONAL CLASS PART 6 CHAPTER 10 NUCLEAR BIOLOGICAL AND CHEMICAL PROTECTION JANUARY 2011 CONTENTS PAGE Sec. 1 General Requirements... 4 Sec. 2 Arrangement... 7 Sec. 3 NBC Shelter and Citadel Requirements... 8 Sec. 4 Testing Veritasveien 1, NO-1322 Høvik, Norway Tel.: Fax: CHANGES IN THE RULES General As of October 2010 all DNV service documents are primarily published electronically. In order to ensure a practical transition from the print scheme to the electronic scheme, all rule chapters having incorporated amendments and corrections more recent than the date of the latest printed issue, have been given the date January An overview of DNV service documents, their update status and historical amendments and corrections may be found through Main changes Since the previous edition (July 2000), this chapter has been amended, most recently in January All changes previously found in Pt.0 Ch.1 Sec.3 have been incorporated and a new date (January 2011) has been given as explained under General. In addition, the layout has been changed to one column in order to improve electronic readability. The electronic pdf version of this document found through is the officially binding version Det Norske Veritas Any comments may be sent by to For subscription orders or information about subscription terms, please use Computer Typesetting (Adobe Frame Maker) by Det Norske Veritas If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall pay compensation to such person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question, provided that the maximum compensation shall never exceed USD 2 million. In this provision Det Norske Veritas shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalf of Det Norske Veritas. Pt.6 Ch.10 Contents Page 3 CONTENTS Sec. 1 General Requirements... 4 A. The Rules... 4 A 100 Rule application... 4 A 200 Assumptions... 4 B. Definitions... 4 B 100 Terms... 4 C. Levels of NBC protection... 5 C 100 NBC levels... 5 D. Classification... 5 D 100 Assignment of class... 5 D 200 Items covered by classification... 5 E. Documentation... 5 E 100 Submission of plans and information... 5 F. Survey... 6 F 100 Site survey... 6 Sec. 2 Arrangement... 7 A. General... 7 A 100 Zoning... 7 A 200 Pre-wetting and wash-down requirements... 7 A 300 NBC marking... 7 Sec. 3 NBC Shelter and Citadel Requirements... 8 A. NBC Shelter and Citadel Requirements... 8 A 100 General requirements... 8 A 200 Ventilation... 8 A 300 Filtering for NBC A 400 Power supply... 9 A 500 Detection system A 600 Main propulsion and auxiliary systems A 700 For engine rooms intended as a sub-citadel with reduced pressure A 800 For engine rooms with limited protection A 900 Engine room arranged as a NBC shelter A 1000 Cleansing station B. Other B 100 General Sec. 4 Testing A. Testing A 100 General A 200 NBC shelter or citadel A 300 Pre-wetting and wash-down system A 400 Detection systems... 14 Pt.6 Ch.10 Sec.1 Page 4 SECTION 1 GENERAL REQUIREMENTS A. The Rules A 100 Rule application 101 The rules in this chapter apply to naval surface craft that are to be equipped for protection against NBC threats. A 200 Assumptions 201 The rules are based on the assumption that the NBC facilities, equipment and systems are properly maintained and functionally tested at regular intervals. B. Definitions B 100 Terms 101 ACU. Air Conditioning Unit. 102 Airlock. A small airtight compartment, with an inner and an outer door operated independently. It serves as an access transition point from the pressurised envelope to atmospheric pressure under NBC threats, and access between NBC zones, between citadel and sub-citadel, and between citadel or sub-citadel and unprotected spaces of the craft. Air locks are provided with air sweep fittings to allow use of filtered, pressurised air to purge the air lock of contaminants. 103 NBC. Nuclear, biological, chemical. 104 Citadel. A series of adjoining compartments, which are protected from NBC contamination. Fresh air is supplied to the citadel through NBC filters. The pressure in the citadel is or can be maintained in excess of the outside pressure. 105 NBC zone. A sub-division of the citadel, which can be operated independently of the adjacent areas. The boundaries of a zone will as far as possible coincide with the damage control areas (containment of flooding, fire and smoke). 106 NBC Sub-citadel. A sub-division of a citadel, autonomous with respect to supply of fresh air through NBC filters and gastight integrity and having all features of a citadel, including airlocks for egress. Access is via the craft's cleansing stations. A sub-citadel will normally include airlocks for egress. Access to the craft's citadel is via cleansing stations and also to the sub-citadels when required by the customer. 107 Sub-citadel with reduced pressure. Part of a NBC zone with lower pressure (e.g. machinery spaces, hangar, bridge, etc.) 108 Limited protection area. A part of the craft supplied with fresh air, which is filtered through HEPA filters to prevent ingress of airborne NBC agents in solid or liquid forms. 109 NBC shelter. A compartment or a series of adjoining compartments, gas-tight isolated from the outside environment providing protection against ingress of NBC agents, without provision of fresh air filtered through a NBC filter. Since provision of fresh air has been stopped in a NBC situation, the air within the NBC shelter will normally have to be re-circulated via coolers or cooled by other means, in order to avoid excessive temperatures inside the NBC shelter. A NBC shelter provides protection of short duration due to increasing concentration of CO 2 in the NBC shelter. 110 N shelter stations. A compartment or compartments in the craft located to give as far as possible maximum protection against gamma radiation. 111 Ct factor. Residual concentration of a given chemical dose in mg/ltr times the disinfectant's contact time in minutes. Pt.6 Ch.10 Sec.1 Page IPE. Individual protective equipment such as: a) NBC protective suit. b) Gloves, protective, NBC (inner and outer). c) Over-boots, NBC, (worn over seagoing working boots). d) NBC respirator with carrier. for use outside the citadel or inside the citadel in case of citadel breach. 113 Cleansing station. An arrangement of gas-tight compartments, providing access from unprotected spaces into the citadel and having facilities for the decontamination of personnel and equipment and containment of contaminated equipment. The doors connecting the compartments within the cleansing stations are to be independently operated. The arrangement of compartments is to be such that the flow of air through the cleansing station is always from the citadel to the unprotected spaces having access to the cleansing station. 114 HEPA filter. High Efficiency Particulate filter. 115 HAT. Harbour Acceptance Trial. 116 SAT. Sea Acceptance Trial. C. Levels of NBC protection C 100 NBC levels 101 The protection from a possible NBC attack is divided into 2 classes, depending on the protection level selected as given in Table C1. Table C1 Levels of NBC protection Class 1 A non-citadel craft without NBC filter. A NBC shelter providing a degree of protection against ingress of NBC agents can be established by isolating a part of the craft from the outside environment and adjoining unprotected compartments. Class 2 A citadel can be established or is permanently installed by providing fresh air through NBC filters, facilitating operations of long duration in a NBC contaminated area with a pressurised citadel. D. Classification D 100 Assignment of class 101 Upon request, craft equipped according to the rules in this chapter will be assigned the additional class notation NBC. The class notation NBC will be complemented with the numbers 1 or 2, according to the protection level aimed for. One of the following class notations will be applicable: NBC 1 NBC 2. D 200 Items covered by classification 201 Installations equipped for NBC protection comprises the following areas, and systems, which are subject to approval: pre-wetting and wash-down requirements zoning structural requirements for citadel ventilation and filtering power supply detection systems means of closing of citadel openings cleansing stations main propulsion and auxiliary systems. E. Documentation E 100 Submission of plans and information 101 Plans showing the following arrangements are to be submitted for information: Pt.6 Ch.10 Sec.1 Page 6 citadel layout and sectioning information of protection, escape routes, doors, air locks, hatches and openings. 102 Plans for the NBC installation covering system safety philosophy and functional design are to be submitted for approval. 103 Plans for the NBC installation covering instrumentation, control and safety systems giving particulars are to be submitted for approval. 104 Plans for testing procedures of the NBC installation are to be submitted for information. F. Survey F 100 Site survey 101 The Society will control for compliance with the rules and approved plans: arrangements and structural integrity ventilation and fresh air filtering system air locks instrumentation test procedures. 102 During installation and construction the Society will control: that the work is carried out to the satisfaction of the surveyor, and in compliance with approved drawings, the rules and with normal good practice that satisfactory tests are carried out to the extent and in the prescribed manner in the rules. Pt.6 Ch.10 Sec.2 Page 7 SECTION 2 ARRANGEMENT A. General A 100 Zoning 101 The craft s citadel may be divided into a number of NBC zones. Boundaries of NBC zones shall normally coincide with the boundaries of damage control and fire zones. For a craft of frigate concept, the recommended minimum number of damage control and fire zones is 4. A 100% overlap between damage control and fire zone is often not possible, for instance the helicopter hangar will be included in the damage control and fire zone, but normally be outside the corresponding NBC zone. 102 A NBC zone is autonomous with respect to: ventilation system with NBC filter gas-tight integrity. A 200 Pre-wetting and wash-down requirements 201 The pre-wet and wash-down system shall give continuous and complete coverage by creating a moving film of water on weather decks and superstructure surfaces. Selected spray nozzles shall cover equipment mounted on weather decks, superstructure surfaces and masts, radomes, etc. If the system also provides fire fighting water e.g. on helicopter decks, system performance requirements for the most demanding system must be met. 202 The overall quantity of water to be delivered by the pre-wetting and wash-down system are to be estimated to ensure that all surfaces, vertical and horizontal, are covered. 3 litres/minute/m 2 is normally required for weather deck plan area. 203 The pre-wet and wash-down systems are to be sectioned so that each damage control and fire zone can be operated independently of the other zones. 204 A craft protected against ingress of NBC agents in accordance with NBC 1 or NBC 2, shall be provided with a wash-down system. A 300 NBC marking 301 The citadels are to be marked for NBC purposes according to the owner s standard for such marking. Pt.6 Ch.10 Sec.3 Page 8 SECTION 3 NBC SHELTER AND CITADEL REQUIREMENTS A. NBC Shelter and Citadel Requirements A 100 General requirements 101 The outer boundary of the NBC shelter or citadel is to be gas tight. 102 All ventilation inlets, outlets, and other openings must be able to be closed and gas tight. 103 Doors, air locks and hatches leading into the NBC shelter or citadel are to be of a construction ensuring gas-tight integrity of the NBC shelter or citadel. 104 Air locks in general are to comply with the following requirements: a) Air locks are to be enclosed by gas-tight bulkheads with gas-tight doors spaced at least 1.0 m apart. b) Air locks are to have a simple geometric form. They are to provide free and easy one way passage, and are to have a deck area not less than 1.0 m 2. Air locks are not to be used for other purposes, for instance as store rooms. c) Facilities need to be provided to prevent simultaneous opening of doors while the citadel is in use. d) The air lock space is to be mechanically ventilated with air purging from the better to the less protected or unprotected space. e) Air locks between NBC zones shall be arranged for purging in both directions. f) For pressurised air locks, means shall be provided for releasing the pressure in the air lock before opening the outer door during peace time when the airlock is being used as entry point into the citadel. The ventilation capacity is to be at least 30 air changes per hour. When the airlock has been used for transit from the citadel to the weather in an identified NBC state, the air lock is in general to be capable to be purged with an increased air flow immediately after the outer door has been closed. At least 5 air changes are required to remove all contaminated air. Means should be provided to switch off the increased purging. 105 For airlocks between sub-citadels the airlocks are to be capable of being purged in both directions. Only one door is to open into the airlock. 106 Means are to be provided to allow for remote closing of fresh air ventilation inlet and outlet openings. Manual closing of the fresh air ventilation inlets from within the protected part of the craft may be accepted. 107 The citadel shall generally employ the principle of stepped pressure differential. The following overpressure compared to atmospheric pressure should generally be achieved: - citadel kpa - NBC zone kpa - sub citadel kpa - sub citadel with reduced pressure kpa. For a two stage cleansing station: - final airlock into citadel kpa - central airlock kpa - second stage kpa - first stage kpa. A 200 Ventilation 201 For NBC-1, the NBC shelter is to be equipped with normal ventilation without NBC filter. The NBC shelter shall be equipped with internal cooling facilities. The NBC shelter ventilation shall be so arranged that it can be switched from supply and extraction of ambient air to re-circulation of air within the NBC shelter via cooling facilities when the NBC shelter is in use. Pt.6 Ch.10 Sec.3 Page For NBC-2, the citadel is to be equipped with: a) A ventilation system that can be converted to provide a pressurised citadel, protected from ingress of NBC agents by switching from ordinary fresh air intake to intake through NBC filter(s). Or b) A ventilation system continuously pressurised to protect the citadel from ingress of NBC agents by providing fresh air through filters. Filter capacity and other facilities for climate control (odour filters and ACU s) are to be dimensioned in accordance with the owner's requirements for operational performance. 203 For NBC-2, when the citadel is in use, the CO 2 levels shall not exceed the following levels, assuming spaces within the citadel are occupied in accordance with operational requirements: a) For permanently occupied spaces, where the workload of occupants is high, the CO 2 levels shall not exceed 0.15%. b) For permanently occupied spaces, where the workload of occupants is low, the CO 2 levels shall not exceed 0.25%. c) For spaces, which are not permanently occupied, the CO 2 levels shall not exceed 0.5% Permanently occupied spaces, where the workload of occupants is high, include control stations like Combat information centre, Machinery control room and hospital facilities. Permanently occupied spaces, where the workload of occupants is low, include accommodation areas, offices and N shelter stations. Allocation of manning of spaces and associated workloads are owner specified. A 300 Filtering for NBC The citadel is to be equipped with a filter station (HEPA filters and gas filter), which provide a minimum protection factor of The ct value shall generally not fall below for any threat agent over a continuous running period of at least one year. 302 The filter station is to be protected by an air-blast protective device, which will withstand an overpressure of 0.3 bar. Disposal of contaminated particular filters and charcoal shall be in accordance with the owner's procedures. 303 For operation in arctic environment means are to be provided to avoid formation of ice at the fresh air intake. 304 The NBC filter station shall comprise the following components which are to be approved by the Society: Pre-filter (Roughing filters) A filter providing a collection efficiency of 85% of particulate matters of 10 microns or greater. Particulate filter The High Efficiency Particulate Filter (HEPA) is required to provide a collection efficiency of % for particulate matters of 0.3 microns or greater. Gas filter Activated carbon filter with impregnated carbon to absorb chemical agents and other gases. A filter complying with STANAG 4447 is acceptable to the Society. 305 The filter station must be designed to allow change of filters without breaching the citadel. A 400 Power supply 401 Power requirements for NBC related equipment in the NBC shelter or citadel may be taken from the standard craft supply system. 402 NBC related systems in the NBC shelter or citadel are to have an arrangement for redundant power supply. 403 The power supplies to the NBC ventilation system are not to be interrupted at any time. Automated load shedding shall not interrupt the power supply to systems required to maintain the citadel pressure. Pt.6 Ch.10 Sec.3 Page 10 A 500 Detection system 501 A radiac system is to be fitted for measuring the intensity of radioactive fallout and measure accumulated dose. One detectors will normally be fitted outside the citadel to detect radiation in the atmosphere, one to detect radiation in the water. Inside the craft detectors will normally be installed in order to monitor total radiation dose and dose rates. Typical locations are: - the bridge - Ship Control Centre (SCC) - operations room - seawater suction pipe in one machinery room. The information from the detectors will normally be displayed in the SCC. Acoustic and visual alarm will normally be located in the SCC, the bridge and in the operations room. The craft is normally to be equipped with acoustic NBC alarm for announcing purposes. 502 A chemical detection system is to be installed to detect and identify chemical agents, and indicate the level of concentration. The system for detecting chemical warfare agents is to be agreed upon with the Society. Two detecting and identifying units are normally to be installed, one on port and one on starboard side in order to continuously monitor the atmosphere outside the citadel. One detecting and identifying unit is normally to be fitted in each NBC zone in order to monitor the atmosphere within the citadel. The information from the detectors is normally to be displayed in the SCC. Acoustic and visual alarm is normally be located in the SCC, the bridge and in the operations room. The craft is normally to be equipped with acoustic NBC alarm for announcing purposes. Detection unit immediately downstream of the NBC filter station may be desirable in order to detect filter breach in an early stage. 503 A biological agents detection system is to be installed to detect and identify biological agents, and indicate the level of concentration. The system for detecting biological agents is to be agreed upon with the Society. The biological agent to be detected and their alarm level should generally fulfil the owner s requirements. 504 The systems are to be installed, tested and maintained in acc
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