Safety-Related Maintenance Requirements

The follow-up subcommittee provides oversight of safety-related maintenance and work order requests. This subcommittee requires special expertise and should consist of maintenance technicians, employees, and a supervisor providing authority to take corrective action. It provides an unbiased review of each safety-related maintenance and work order created, schedules, and completed work within a designated time period or still outstanding. Its objective is to assist the maintenance staff in setting risk-related priorities and ensure that corrective actions are fully implemented. 

Overall operation, maintenance and repair To operate, maintain and repair the E/E/PE safety-related systems in order that the required functional safety is maintained EUC and the EUC control system E/E/PE safety-related systems. Requirement for the modification or retrofit under the procedures for the management of functional safety Continuing achievement of the required functional safety for the SIS Chronological records of operation repair and maintenance... 

Safety Related Maintenance - As a result of reviews in this area, approximately 350 procedures were identified as requiring revision. This work is ongoing. 

The design constraints identified as necessary to control system hazards are passed to the implementers and assurers of the individual system components along with standards and other requirements. Success is determined through feedback provided by test reports, reviews, and various additional hazard analyses. At the end of the development process, the results of the hazard analyses as well as documentation of the safety-related design features and design rationale should be passed on to the maintenance group to be used in the system evolution and sustainment process. 

Maintenance requires ongoing vigilance, just like safety. If these two aspects of plant operation are not conscientiously practiced, they may affect profits and personnel, customer, and community relations. 

All appointed staff are therefore required to have an understanding of the Site Licence. The engineers appointed to Operating and Maintenance positions need to have an in-depth understanding and appreciation of Station Operating Instructions (SOIs), Plant Item Operating Instructions (PIOIs), Plant Maintenance Instructions (PIMIs) and other technical and safety related matters. These are described below. 

General guidance related to the overall design, operation, and maintenance requirements of electrical distribution systems at DOE facilities is provided in Division 16 of DOE 6430.1A. The criteria contained in this section of the Order are based on accepted industry standards for electrical system design and operation, such as NFPA 70, National Electrical Code (NEC) and those promulgated by NRC, IEEE, ANSI, NEMA, and UL. Additionally, all systems should comply with the NEC and ANSI C2, "National Electrical Safety Code."... 

Initial startup testing procedures have been prepared and implemented to demonstrate that structures, systems, and components (SSCs) and processes will perform as intended. Initial testing includes, as appropriate, bench tests and proof tests prior to installation, mockup tests, pre-operational tests, post-maintenance tests, post-modification tests, and operational startup tests. Safety-related items are subject to the quality-assurance requirements of SNL/NM Research Reactor and Experimental Programs (RREP) Quality Assurance Program Plan (SNL 1998a), as implemented by the facility Project/Experiment Quality Plan (PEQP). Testing inciudes those initial tests mandated by applicable Technical Safety Requirement (TSR) surveiilance requirements (see Chapter 5.0, "Derivation of Technical Safety Requirements") and Operational Readiness Review (ORR) requirements (see DOE O 425.1 and DOE-STD-3006-93). 

The HCF maintenance management program is described in the SNL/NM Nuclear Facility Maintenance Implementation Plan (MIP) in (SNL 1997) and the SNL/NM Site Maintenance Plan (SNL 1993). Maintenance activities for the HCF are conducted by the three groups mentioned above that is, HCF personnel, ES H Center personnel, and FOE Center personnel. The scope of SSCs for which maintenance will be performed is established by the latest edition of the HCF Master Equipment List (MEL). This list differentiates between safety-related and nonsafety-related SSCs and specifically identifies those SSCs for which TSR surveillance requirements have been established, it also identifies the organization responsible for performing maintenance on each item. 

The manager of the HCF organization is responsible for obtaining the resources necessary to perform in a timely manner the required preventive and corrective maintenance of those safety-related items for which the organization is responsible. ES H Center personnel are responsible for obtaining the resources necessary to perform in a timely manner the required calibration and preventive and corrective maintenance of the radiation-monitoring equipment. All of these personnel report to senior SNL/NM managers to obtain prompt resolution of any maintenance problems that could affect the safety of the HCF. 

A Safety User Manual containing information pertaining to the installation, use and maintenance of the safety-related control system is required. 

OSHA now considers the NEC or NFPA/ANSI 70 as a national consensus standard. Article 517 of NFPA 70 contains special electrical requirements for healthcare facilities. Refer to 29 CFR 1926.401-449 for OSHA construction-related electrical requirements. In addition, state and local regulations may apply. Electricians and maintenance personnel must understand the OSHA electrical safety standards published in 29 CFR 1910.301-399. Electrical installations and utilization... 

Along with components and materials, safety related documentation may also age in the sense that over time it may become out of date or even obsolete. Research reactors are frequently modified to incorporate new experimental facilities and the modifications require updating of documentation. This fact and the fact that testing and repair may also need to be changed with ageing is particularly important for the maintenance programme which is the... 

Subpart K deals with the means of providing electrical power, both permanent and temporary, to a jobsite. Subpart K also states that the electrical standards do not apply to existing permanent installations that were on the site before construction began. There are four major divisions of this subpart including installation safety requirements, safety-related work practices, maintenance and environmental considerations, and requirements for speciai equipment. 

The plant and buildings of the BWR 90 are laid out and designed to satisfy aspects of safety, maintenance and communication in a balanced way. The layout is strongly influenced by safety requirements, in particular the physical separation of safety-related equipment. With respect to building layout and arrangement ABB Atom has traditionally favoured a coordinated and compact building complex the number of doors and transport openings, release points, transport routes etc. can be kept low and supervision becomes easier. 

ADEQUACY OF EXISTING MAINTENANCE REQUIREMENTS FOR SAFETY RELATED SYSTEMS... 

General requirements Development of overall safety requirements concepts, scope definitions (7.1—75) (clause numbers—Typ.) allocation of safety related requirements to E/E/PEs (7.6) specification of safety requirements (7.10) installation commissioning, safety validation, operation and maintenance, modification and retrofit, decommissioning or disposal of E/E/PEs (7.13 and 7.14). Operation, maintenance modification (7.15—7.17) Yes Yes Yes ... 

Requirements for the availability of the electrical power sources should be stated for all operational states. These include off-site sources on-site generators (diesels and gas turbines, including associated fuel reserves) batteries and associated control protective, distribution and switching devices. The operability requirements should be such that sufficient power will be available to supply all safety related equipment necessary for safe shutdown of the plant, and for the mitigation and control of accident conditions. The operabihty requirements should determine the necessary power, redundancy of supply lines, maximum permissible time delays and necessary duration of the emergency power supply. Equivalent requirements should be stated for other power sources (for example, the pneumatic power system). Particular care should be taken to ensure that electrical supplies remain adequate in shutdown operations, when many systems and components will be out of service for maintenance. 

As part of USNRC s ongoing regulatory activities, inspections such as Safety System Functional Inspections include the reliability of SOVs as well as other components required by safety related applications. The NRC also is providing technical advice to the Electric Power Research Institute s Nuclear Maintenance Application Center to assist in preparing an SOV maintenance guide. 

Several actions were taken either by the licensees or the regulatory bodies in Member States. Those actions taken by the licensees include establishment of review programmes, review of RPS and other safety-related components and relative post-maintenance, testing, review of modification, preventive maintenance and surveillance programmes, etc. Actions taken by regulatory bodies include review of licensee s programmes and activities, development and issuance of certain requirements and relative documents, etc. 

The design of an interim spent fuel storage facility shall provide for an appropriate programme of inspection and maintenance of safety related components and systems. The design of a spent fuel storage facility shall provide safe access to all systems, areas and components requiring periodic inspection and/or maintenance. The access provided shall be sufficient for the safe operation of all required tools and equipment and for the installation of spares. 

---