ML091330441

Seabrook - Updated Final Safety Analysis Report, Revision 12, Chapter 12, Radiation Protection

ML091330441
Person / Time
Site:	Seabrook
Issue date:	11/03/2008
From:	Florida Power & Light Energy Seabrook
To:	Office of Nuclear Reactor Regulation
References
SBK-L-08172
Download: ML091330441 (210)

Text

S EABROOK S TATION U PDATED F INAL S AFETY A NALYSIS R EPORT C HAPTER 12 RADIATION PROTECTION

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 1 12.1 ENSURING THAT OCCUPATIO NAL RADIATION EXPOSURES ARE AS LOW AS IS REASONABLY ACHIEVABLE (ALARA) 12.1.1 Policy Considerations It is the policy of FPL Energy Seabrook to ma intain occupational radiation exposure during Seabrook Station operations as low as is reasonably achievable (ALARA). This policy and philosophy of keeping exposure to radiation ALARA is derived from th e fact that ionizing radiation is biologically damaging and that the amount of damage is related to, among other things, the magnitude of the dose received. The ALARA philosophy, as embodied in Regulat ory Guide 8.8, Revision 3 and 8.10, Revision 1, is implemented by employing sound radiation prot ection practices and techniques as delineated in the Radiation Protection Manual and Health Physics procedures. The implementation of the ALARA philosophy includes all phases of station operations from startup to eventual decommissioning. What is "reasonably achievable," for exposure reduction, is a judgment which all Seabrook Station management personnel are required to make. However, it is also the responsibility of station employees to make judgm ents regarding their radiation exposure during the performance of their assigned tasks in a radiologically controlled area. The basis for these judgments should include an assessment of the state of technology and the economics of improvements in relation to all of the benefits from these improvements. 12.1.1.1 Overall ALARA Policy Responsibilities The Station Director has the overall responsibility and authority for implementing the ALARA philosophy. He delegates this responsibility and authority to the Health Physics Department Supervisor. The Health Physics Department Supervisor ensures that the ALARA philosophy

receives proper attention and that adequate resources are made available. He also reviews the progress in the area of exposure reduction, ensu res that corrective actions are taken when necessary, and provides overall direction and coordination of the ALARA policy. This may include the following: a. Participation in design reviews for facilities and equipment that can effect potential radiation exposures b. Identification of situations that have potential for causing significant exposures to radiation c. Implementation of an exposure control program (ascertain which jobs should be closely controlled for exposure purposes)

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 2 d. Development of procedures and methods for keeping radiation exposures of station personnel ALARA e. Review of selected job procedures to maintain exposures ALARA f. Participation in the development and implementation of training programs related to work in radiation areas or involving radioactive materials g. Establishment of a radiation exposure surveillance program to maintain data on exposures of station personnel by job function and/or specific jobs h. Performance of trend analyses of station radiological data such as contamination and radiation levels i. On-the-job inspection of selected tasks in progress to review effectiveness of the ALARA policy j. Documentation of ALARA efforts as determined necessary

k. Supervising, training and qualifying the radiation protection staff of the station

l. Ensuring that adequate radiation prot ection coverage is provided for station personnel during all working hours.

A Health Physics professional assists the Health Physics Department Supervisor in performing and coordinating the above ALARA functions and activities. Additionally, health physics personnel have the responsibility for providing exposure reduction guidance to workers during routine support interfaces. Subsection 12.5.1 provi des a description of the Health Physics Department organization and responsibilities with regard to radiation protection. 12.1.1.2 Direct ALARA Policy Responsibility Direct responsibility for implementation of the ALARA philosophy rests with each member of the Seabrook Station management organization. As managers, they are directly responsible for a defined area of the overall station operation and understand this responsibility includes minimizing radiation exposures for both their ow n personal and other station personnel. In keeping with the overall station goals of providing maximum availability, highest efficiency and the best working environment possible, management will ensure that station personnel perform all radiologically controlled area tasks in accordan ce with general and/or job-specific procedures and the ALARA philosophy.

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 3 This is accomplished through careful consideration of the following general guidelines: a. When required, develop clear, easily understood, job specific procedures b. Ensure that work being performed by procedure is accomplished on an orderly and timely basis c. Plan and schedule work to ensure that it does not interfere with other work in progress in the same area and that individuals not required for the work are not assigned d. Ensure that workers are familiar with the work assignments, requirements, procedures, and locations e. Modify methods, techniques and procedures on a timely basis to account for changes in technology, modified equipment and/or identification of inadequacies f. Provide training to personnel as necessary to improve skills and minimize dependence on certain individuals for performance of specific tasks g. Investigate and specify the use of exposure-reducing techniques wherever practical and reasonable h. Coordinate activities and procedures with the Health Physics Department to insure adequate review. 12.1.1.3 Employee Responsibilities Radiation workers, whether permanent or temporary, are informed of their responsibilities for maintaining ALARA exposure for both themselves and fellow workers. This includes the responsibilities to notify supervisors of procedural changes that should be considered to reduce exposure and to report to radiation protection personnel potential radiological hazards that may result in unnecessary exposure. Employees are expected to actively participate in training programs developed for their specific disciplines and assigned major exposure tasks.

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 4 12.1.1.4 Training To ensure all personnel fully understand the necessity of minimizing their exposure as well as their fellow workers' exposure, a radiation safety training program is provided. The Manager of Nuclear Training is responsible for the conduct of the training program and will coordinate inputs by the Health Physics Department Supervisor and other department supervisors regarding content and concepts. As a minimum, radiation workers are given a basic course in radiation protection, station requirements and federal regulations to understand the requirements for entering a radiologically controlled area.

Additionally, detailed radiation protection instruc tions are provided to those individuals whose duties require working with radioactive materi als, entering radiologically controlled areas (RCA), or directing the activities of personnel who work with radioactive materials or enter radiologically controlled areas. This instruction emphasizes exposure reduction techniques and the ALARA philosophy. The above training programs and other training programs that are conducted at Seabrook Station are outlined in Section 13.2. All instruction, whether the subject matter pertains to radiation safety, plant systems or craft skills, is intended to result in a training program that promotes the ALARA philosophy through improved workmanship and reliability. 12.1.2 Design Considerations This subsection deals with the station layout, equipment location, and equipment maintainability, as applicable to the ALARA concept. The obj ectives of the design considerations, which are consistent with Regulatory Guide 8.8, Section C.3, are to reduce the number of personnel needed to perform work in a radiation area associated with maintenance activities, reduce maintenance time, and minimize radiological conditions. The designers have employed experience from past designs and operating plants to help reduce exposure from components and work on components. Reviews have been conducted by pe rsonnel with experience in radiation protection at operating power plants.

12.1.2.1 Reduction of Work Force Exposure to Radiation There are three basic design considerations which allow a reduction of the work force in a radiation area. The design considerations are:

a. Reliability

b. Location

c. Maintainability.

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 5 Each of the above items can be subdivided many times, but emphasis will be placed on generalized designs and considerations. Emphasis has been given to the reliability of equipment. Increasing the reliability of equipment, by design, decreases the need for inspection, maintenance, and preventive maintenance. When redundancy is used to increase reliability, the maintenance duration and location may not change, but maintenance can usually be performed when radiological conditions are more conducive to ALARA. Equipment location is used where practical to eliminate exposure by placing equipment in nonradiologically controlled areas. When equipm ent is placed in the radiologically controlled area, then, when practical, the equipment is located away or shielded from substantially higher radiation areas. Additional reductions in exposure are made possible by locating equipment so that a minimum number of personnel are necessary to perform maintenance; i.e., adequate working and removal space are provided.

The work force necessary to perform maintenance on equipment is dependent on the ease of repairing the equipment. Selection of some equipment and systems is partially based on the ease of repair. 12.1.2.2 Work Time Reduction in the RCA The time necessary to perform tasks is reduced where practical. The time reduction is accomplished by advanced technology and good general designs, such as equipment location, ventilation, and remote tools. The use of advanced technology allows inspection and repair work to be performed faster. For example, advanced technology is responsible for an increased speed in performing in-service inspection (ISI) of steam generators and steam generator tube plugging. Improved design of valves seals allows less and faster maintenance. There are many exam ples of the use of advanced technology in the Seabrook design helping to reduce the plant man-rem figure. The above two examples were chosen due to the high exposure rate associated with the work.

Good quality general designs have been used to reduce the man-rem expenditure. The reduction in man-rem exposure is due to parts of equipmen t fitting together properly without the need for modifications, along with other components and systems such as the ventilation system described in Subsection 12.3.3. This is extremely effective in reducing exposure due to removal and replacement of insulation for repair and ISI work.

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 6 12.1.2.3 Reduction of Radiological Conditions The facility general design has been reviewed by experienced personnel to ensure that systems, equipment (described in Subsection 12.3.1), ve ntilation (described in Subsection 12.3.3), and shielding design (described in Subsection 12.3.2) provides acceptably low exposures. The following design features have been incorporated in the RCA where reasonably possible: a. Shielding of pipe chases and equipment containing radioactive materials (permanent and provisions for temporary) b. Placement of reach rods for remote control c. Placement of switches for remote control of equipment

d. Use of low nickel and low cobalt alloys to reduce cobalt problems

e. Leak detectors to reduce the amount of leakage and contamination by rapid detection and, therefore, appropriate action f. Remote control panels where appropria te, such as for rad-waste processing and fuel transferring g. Design of pipes for low or no crud trap problems

h. Floor drains for moving radioactive liquids to the Waste Processing System

i. Penetrations are stepped, shielded, or are out of line of site with the source when possible j. Radiation Monitoring System to detect changes in radiation levels (discussed in Subsection 12.3.4) k. Limiting personnel access to areas by barri cading and/or locking, (discussed in Subsection 12.5.3.3) l. Provisions for flushing and purging of contaminated systems.

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 7 There are many methods of reducing the exposure magnitude which do not require permanent station modification. The following is a partial list of methods available to reduce the exposure rate to workers: a. Prevention of contamination b. Decontamination of equipment

c. Removal of components to lower radiation zone for work

d. Before transferring highly contaminated equipment the equipment should be decontaminated, or the contamination should be prevented from spreading by placing the equipment in a container. e. Use of portable shielding

f. Provisions for air and water filtration. 12.1.2.4 ALARA Design Changes Periodic review of plant design and equipment for ALARA considerations has resulted in the following changes: a. Restricted access to the RHR vaults via ladders in the containment building spray heat exchanger room b. Restricted access to the waste gas regenerative compressor room, waste gas dryer columns, and waste gas valve room in the Waste Processing Building c. Rearrangement of the primary sample heat exchanger and sink to reduce shine

d. Rearrangement of the evaporator equipment to reduce exposure levels in adjacent walkways. 12.1.2.5 Management of Radiation Protection Design Review - Construction Phase The Seabrook Station ALARA program for constr uction, design changes, and reviewing field run piping was the joint responsibility of Westinghouse Electric Corporation (Westinghouse), United Engineers and Constructors Inc., (UE&C), Yankee Atomic Electric Company - Nuclear Services Division (YAEC), and New Hampshire Yankee (NHY).

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 8 Westinghouse was responsible for the design, fabrication and delivery of the Nuclear Steam Supply System, related auxiliary systems and th e nuclear fuel. Technical direction for the installation of this equipment and technical assistance throughout the preoperational testing, initial core loading and testing programs were further responsibilities of Westinghouse.

United Engineers and Constructors (UE&C) wa s responsible for the engineering, design and construction management of the station. Included in their scope were the supply and installation of the balance of plant systems, components, and structures so that a complete and integrated facility was assured. The radiation design review performed by UE&C was the responsibility of the Chief Power Engineer. The Chief Power Engineer ensured that an overall design program was implemented to help maintain occupational radiation exposur es As Low As Reasonably Achievable (ALARA) during operation of the facility. He provided appropriate guidance to Chief Discipline Engineers regarding ALARA design implementation and verified implementation.

The chief discipline engineers (electrical, mechanical, instrumentation, etc.) provided for incorporation of ALARA considerations. This was accomplished by providing guidance to engineers responsible for the design of Seabr ook Station. The Chief Engineers or designers reviewed the various systems to ensure provided guidance was used.

The Quality Assurance Manual defined contractor responsibilities as follows:

"Each contractor shall maintain design control measures as required by ANSI N45.2.11. These design measures shall be applied to areas such as the following: ... accessibility for in-service inspection, maintenance and repair..." The YNSD Project Office established appropriate reviewers as determined by the Quality Assurance Manual and Section 17.1 of the Seabr ook Station Updated FSAR. Project policies indicate primary and secondary reviewers of UE&C specifications; Westinghouse specifications; UE&C system descriptions; Westinghouse system descriptions; Updated FSAR chapters, sections, and subsections, engineering changes and general arrangement drawings of the Containment, Fuel Storage and Primary Auxiliary Building. Project policies also indicated the type of documentation required for reviews. The documentation was in the form of Engineering Review Reports, memoranda or other reports.

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 9 a. Design Reviewers YNSD Radiation Protection personnel di d not always possess the necessary expertise to perform complete ALARA re views. The YNSD Radiation Protection Group relied on engineers with the expertise to determine equipment compatibility, accessibility (ladders, platforms, laydown space), operability and maintenance history (low-maintenance). Individuals performing reviews were usually Engineer grade or higher (B.S. degree or equivalent and 3 years professional experience). Individuals within departments who performed the reviews were chosen based on their general knowledge of the system and equipment. The departments within YNSD who performed reviews are listed below with some of their responsibilities: 1. Plant Engineering Department (Instrumentation and Control Group, Electrical Engineering Group, Mech anical Engineering Group and Systems Engineering Group)

- Supported the Project Office in general and detailed technical review and guidance for plant c oncept, design construction and licensing in the field of Fluid Systems, Instrumentation and Control, Electrical Engineering, Mechanical Engineering, Systems Engineering, Materials Engineeri ng and Structural Engineering. - Coordinated electrical and control design between the architect-engineer and nuclear steam system supplier. - Reviewed conceptual design and detailed engineering of all assigned primary and secondary fluid systems, included types of components selected, modes of operation and physical arrangements. - Reviewed all electrical and control equipment specifications, logic and wiring diagrams. These reviews included transformers, motors and switchgear, plant control devices, nuclear instrumentation and reactor control and protection system equipment.

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 10 2. Nuclear Engineering Department (PWR Transient Analysis Group, Reactor Physics Group and LOCA Analysis Group) - Reviewed all reactor physics design work performed by the reactor supplier to assure adherence to the design criteria and the use of adequate methods and assumptions. - Reviewed and/or participated in the design of instrumentation for core monitoring. - Verified that operational requirements were given adequate consideration and were appropriately factored into the design. - Assisted in the development of Technical Specifications and station operating procedures for accident conditions. - Reviewed the various station anticipated transients and accidents to ensure conformance with all applicable criteria. - Reviewed and analyzed data from the station to verify the reactor physics design. 3. Fuel Management Department (Nuclear Materials Group, Economic Analysis Group and Core Components Group) - Reviewed and approved mechanical designs and specifications for nuclear fuel assemblies and components. - Reviewed specifications, procedures, purchase orders and drawings for proper definition of quality assurance requirements for nuclear fuel assemblies. 4. Environmental Engineering Department (Radiological Engineering Group, Radiation Protection Group, Environmental Sciences Group and Environmental Laboratory) - Established functional requirements of engineered safeguard systems and evaluation of their performance. - Participated in the design and re view of solid, liquid and gaseous radioactive waste treatment systems.

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 11 - Participated in the establishment of system design requirements for plant process and area Radiation Monitoring Systems. - Participated in the establishment of Station Radiological Equipment and Facilities. 12.1.2.6 Independent Reviews The ongoing interactions between NHY, YAEC, Westinghouse and UE&C engineers and radiation protection personnel resulted in conti nuous cross-checking or "independent" reviews of each organization's design, construction and operational activities. Proposals to modify or

establish designs received appropriate levels of review by these diverse organizations.

Additionally, these organizations recognized that professional contractor organizations are available for use, as necessary, to provide assist ance in specialized areas of radiation protection.

Contractor organizations have been used to provi de specialized evaluations in such cases as the analysis of the proposed removable shielding for the reactor vessel annulus and the assessment of the radiological impact of the spent resin transfer system design. Such special evaluations significantly contributed to design review effort s directed toward ensuring that occupational exposures are maintained ALARA. 12.1.2.7 Field Reviews The later example, cited in Subsection 12.1.2.6, is an instance of the onsite ALARA reviews conducted during the construction phase under the auspices of the Seabrook Station Health Physics Department. These evaluations were performed on systems, components and areas in accordance with station ALARA policies.

These evaluations were used to identify potential beneficial modifications, as well as to provide background information for use during operations.

Expertise and assistance was obtained, as necessary, from other applicable station departments.

Coordination of major actions and the final d ecisions were the responsibility of appropriate station and corporate manageme nt. YNSD and, when necessary, UE&C were party to these station activities.

Day-to-day aspects of this ALARA effort were conducted by station Health Physics Technicians supervised by Health Physics Working Foremen under the cognizance of health physics supervisors. A Health Physicist - ALARA also participated in the daily efforts as well as coordinating long-term ALARA-related activities. Minimum experience and educational qualifications for Health Physics Department personnel are described in Subsection 12.5.1.

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 12 The onsite ALARA field review program, in concert with ALARA design considerations addressed by Westinghouse, UE&C, YNSD and select ed professional contractors, as discussed in previous sections, is used by Seabrook management to ensure that the construction and operation of Seabrook Station results in occupati onal radiation exposures that are as low as reasonably achievable. 12.1.3 Operational Considerations Operational considerations concern the station personnel efforts of ensuring the application of the ALARA philosophy to both day-to-day routines, and periodic tasks such as special maintenance, in-service inspections and refueling. In all cases, these efforts are consistent with the established radiation protection program. 12.1.3.1 General Operational Concept As described in Subsection 12.1.1, the responsibilities for maintaining exposures ALARA does not rest with just one or several individuals, but rests with all personnel involved with planning, supervising or implementing work in radiological areas. The health physics department is

charged with the overall responsibility and likewise, will be the most influential and informed department for specifying and ensuring the use of exposure-reduction techniques and methods by station personnel wherever and whenever practicable. When a task is scheduled to be performed on any system that contains, collects, stores or transports radioactive liquids, gases and/or solids, the specific current and/or anticipated radiological conditions involved with that task will be determined. Health Physics factors the task complexity, difficulty, actual and/or proj ected radiological conditions, and a knowledge of plant systems into the specification of radiation protection and control requirements for the performance of the job. In addition, health physics provides input into the job planning and preparations so the job can be performed in a radiologically safe manner and with the least practical exposure. Where possible, the total e xposure expenditure for the job (collective dose of all those personnel planned to be involved) is estimated. Such estimates permit manpower planning by management, but more importantly, they aid in the identification of those jobs that would likely result in a substantial total e xposure and accordingly, where a significant dose reduction could be realized. Means to reduce exposure which could then be employed include, among others, the following: a. Preoperational briefing by health physics personnel b. Development of special procedures

c. Specific training on a mock-up of a component, equipment or structure S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 13 d. Development and use of special tools e. Use of localized ventilation

f. Decontamination of equipment/areas

g. Draining, flushing or filling of pipes or components

h. Use of contamination containing devi ces (i.e., liquid collection, drop cloths, containments or tents) i. Removal of equipment to areas of lower dose rates

j. Prefabrication of complicated equipment or structure

k. Radiological surveillance during a job to identify changing conditions

l. Provision for periodic supervision

m. Contracting specialist services. In most instances, the collective exposure from us ing any of the above t echniques or others and from the actual performance of a job must be considered to ensure actions are feasible and will not result in an increase of total exposure (although this may be necessary in special circumstances). Additionally, post-operation debriefings may be used, as appropriate, to identify what problems were encountered and to determine how the job techniques may be modified to reduce exposure in the future. 12.1.3.2 Procedure Development Each department supervisor is responsible for developing department procedures that ensure compliance with applicable regulations. These procedures, developed as discussed in Section 13.5, also provide instructions to personnel for the performance of routine and special tasks that may include work in a radiologically controlled area of the station. These tasks include, among others, refueling operations, radioactive waste handling, in-service inspections, process sampling and surveillance, instrument calibrations and ma intenance. Radiation protection supervisory personnel review procedures involving work with radioactive materials or work to be performed in radiation or high radiation areas, as de fined in the Radiation Protection Manual.

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 14 Jobs with a significant radiological risk (e.g., above a projected dose threshold) undergo a documented planning and review process. This planning includes a review of procedures and techniques, work site provisions, worker preparation and training, and radiological considerations which can minimize the radiological risk to the worker. Personnel with relevant expertise are given prime responsibility for planning such jobs and documenting their preparations, and Health Physics supervis ory personnel oversee and approve the final preparations. 12.1.4 Decommissioning Considerations Seabrook Station relies on preparations in several areas to ensure that occupational radiation exposures are maintained as low as reasonably achievable (ALARA) during plant decommissioning.

As discussed in the following subsection, Seabr ook incorporates design features that offer significant exposure reduction during decommissioning. These design features are merely the basis for the performance of an ALARA-oriented radiation protection program during plant operations, as well as effective ALARA preparations during decommissioning planning.

An important aspect of the decommissioning pro cedure is the use of specific ALARA practices tailored to deal with the particular decommissioning method employed. Delineation of these specific ALARA practices (including engineering design modifications) takes place during decommissioning planning, after information concerning the specific decommissioning method becomes available. Consistent with the gui dance provided by 10 CFR 20 and Regulatory Guide 8.8, Revision 3, the specific practices implemented will be based on "as assessment of the state of technology and economic considerations" prevalent at the time of decommissioning. The state of technology and the economics that w ill prevail 40 years in the future are unknown factors and, therefore, performance of a cost benefit analysis is precluded at this time. The commitment to formulate and implement the ALARA philosophy during decommissioning includes an acknowledgement and understanding that the process of preparing for eventual decommissioning with occupational exposure as low as reasonably achievable is ongoing in nature. 12.1.4.1 Design Features Contributing to ALARA during Decommissioning Many basic ALARA design features incorporat ed into Seabrook Station for operations, maintenance and refueling will enhance exposur e reduction during those phases and also during decommissioning, regardless of the specific decommi ssioning procedure. In effect, this is a generic, ALARA approach to operations and decommissioning.

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 15 Specific design features that will be used to maintain occupational radiation exposures ALARA include: a. A separate building exists for waste processing and disposal that ensures availability of waste processing facilities while other systems and components are being maintained or dismantled. b. The main hoist of the polar crane has been derated to 302 tons. The crane must be refurbished before it is capable of removing the reactor vessel or the steam generators. There is adequate capacity as is to lift the pressurizer. These components can be removed with minimal displacement of permanent concrete shielding to afford its maximum effectiveness. c. Seabrook containments are equipped with 27-foot diameter equipment hatches that facilitate removal of large equipment intact. Generic design features used to maintain occupational radiation exposure ALARA include: a. Location of Equipment As stated in Updated FSAR Subsection 12.1.2.1, paragraph (4), "Equipment location is used, where practical, to eliminate exposure by placing equipment in nonradiation control areas." This philosophy is embodied in the segregation of areas with radioactive systems and components. The design philosophy "to minimize the extent of areas housing radioactive equipment and piping through efficient arrangement of equipment and systems" as stated in Updated FSAR Subsection 12.3.1b. b. Equipment Accessibility and Removability Updated FSAR Subsection 12.1.2.1 indicates that equipment is designed and located to maximize accessibility to facilitate rapid, efficient work. Equipment is

also designed and placed to enhance removal operations and thus, minimize exposure time. c. Plant Layout Updated FSAR Subsection 12.3.1.3a explains that "plant layout includes optimal location of radioactive components."

S EABROOK S TATION UFSAR R ADIATION PROTECTION Ensuring that Occupational Radiation Exposures are as Low as is Reasonably Achievable (ALARA)

Revision 9 Section 12.1 Page 16 d. Flush/Drain Connections The provision of flush and drain connections on many systems and components enables extensive chemical decontamination prior to operating phase maintenance and later, decommissioning. e. Corrosion Control Internal accumulation of radioactive material is limited through effective corrosion-control methods. Careful selection of plant materials and an aggressive chemistry control program greatly reduce source terms that must be dealt with during operating phase maintenance and decommissioning.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 1 12.2 RADIATION SOURCES The primary source of neutron and gamma radiation is the reactor core and Primary Coolant System. The secondary sources are contained in, or emanate from, the auxiliary systems and components not included as part of the Nuclear Steam Supply System. Radioactivity in these systems generally originates from: - Fission products that have escaped into the coolant and are either deposited or carried into other systems, and - Corrosion products activated while passing through the reactor core.

The basis for calculation of radiation source terms for shielding purposes for the various plant systems for normal operation is the concentrations of fission and corrosion products in the reactor coolant during operation at one percent failed fuel. The bases for calculation of radioisotope concentrations in the reactor coolant, including assumed failed fuel percentage and the applicability of ANSI N237 and Regulatory Guide 1.112, are discussed in Subsection 11.1.1. Source terms for accident conditions are addressed in Chapter 15. The radiation sources and associated input parameters, assumptions, and methodology described in Section 12.2 represent those used to establish original shielding design. The radiation sources utilized for the design of the primary shield were developed by the reactor vendor and are based on a standard four loop Pressurized Water Reactor. The radiation sources in the spent fuel and the N-16 source were also developed by the reactor vendor, and are based on a reactor power of 3565 MWt. The radiation sources in the primary coolant system and the auxiliary systems are based on a reactor power of 3654 MW t, a one-year fuel cycle, and 1 percent fuel element defects. The impact on plant shielding requirements was evaluated for an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle. This represents a minor change from the original design basis. The conservative analytical techniques used to establish the original shielding requirements, and the Station Technical Specification which will restrict the reactor coolant activity to levels significantly less than the 1 percent fuel defects, ensure that operation at the licensed core power level will have no significant impact on shielding requirements and safe plant operation.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 2 With the exception of Table 12.2-11, Table 12.2-27 and Table 12.2-29, data contained in Table 12.2-1, Table 12.2-2, Table 12.2-3, Table 12.2-4, Table 12.2-5, Table 12.2-6, Table 12.2-7, Table 12.2-8, Table 12.2-9, Table 12.2-10, Table 12.2-11, Table 12.2-12, Table 12.2-13, Table 12.2-14, Table 12.2-15, Table 12.2-16, Table 12.2-17, Table 12.2-18, Table 12.2-19, Table 12.2-20, Table 12.2-21, Table 12.2-22, Table 12.2-23, Table 12.2-24, Table 12.2-25, Table 12.2-26, Table 12.2-27, Table 12.2-28, Table 12.2-29, Table 12.2-30, Table 12.2-31, Table 12.2-32, Table 12.2-33, Table 12.2-34, Table 12.2-35, Table 12.2-36, and Table 12.2-37 are independent of one or two unit operation. The data contained in Table 12.2-11, Table 12.2-27, and Table 12.2-29 are based on a two-unit operation with the relevant assumptions provided in the appropriate sections. 12.2.1 Contained Sources The sources contained in the equipment of the Primary, Auxiliary and Radioactive Waste Management Systems and all other major sources of radiation during normal operation are described in this chapter. The components of these systems are represented by cylinders approximating their actual geometry in the computer code used to calculate shielding requirements. The location of all equipment containing radioactive sources is shown in Figure 12.3-1, Figure 12.3-2, Figure 12.3-3, Figure 12.3-4, Figure 12.3-5, Figure 12.3-6, Figure 12.3-7, Figure 12.3-8, Figure 12.3-9, Figure 12.3-10, Figure 12.3-11, Figure 12.3-12, Figure 12.3-13, Figure 12.3-14, Figure 12.3-15 and Figure 12.3-16. 12.2.1.1 Source Terms for Reactor Core and Spent Fuel Pool

a. Source Terms for the Reactor Core The major contribution of neutron radiation levels external to the reactor biological shield is due to fast neutron leakage from the reactor cavity during power operation. Reactor shielding design is based on a reactor vendor-supplied source term, the result of a quadrature analysis using the DOT III-W code. The source term consists of fifty-three angular fluxes at 216 mesh intervals for thirteen neutron energy groups at the reactor vessel surface. Neutron and gamma flux spectrums are given in Table 12.2-1 and Table 12.2-2. b. Source Terms for Spent Fuel Pool Shielding Shielding design source terms for the high density spent fuel pool are based on the "worst-case" of a full core of 193 fuel assemblies with 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> decay, and are given in Table 12.2-3.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 3 12.2.1.2 Source Terms for Spent Fuel Transfer Shielding for spent fuel transfer is based on a source term supplied by the re actor vendor, shown in Table 12.2-3. The source strength given represents an average fuel assembly with four days decay after an irradiation time of 3.1 years. The fuel assembly is approximately 152 inches long and 8.5 inches square in cross section. The bounding source term used to evaluate minimum water depth requirements to maintain dose rates below 2.5 mrem during fuel movement in the spent fuel pool is shown in Table 12.2-3. The source strength given represents a peak fuel assembly with 80 hour9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br /> decay after an irradiation time of 69,000 Mwd/Mtu. The fuel is approximate ly 152 inches long and 8.5 inches square in cross section. 12.2.1.3 Sources in the Reactor Coolant System (RCS)

a. Reactor Coolant System Nitrogen-16 The N-16 activity of the coolant is th e controlling radiation source in the design of the RCS secondary shielding, and is given in Table 12.2-4 as a function of transport time in a reactor coolant loop. b. Deposited Corrosion Products The most significant radiation sources encountered during normal maintenance and inspection of most plant equipment (pumps, heat exchangers, tanks, valves, and other out-of-core primary equipment) are deposits from the reactor coolant, such as activat ed corrosion products and some fission products. The activity of the deposits is predominantly due to Co-58 and Co-60. It is estimated that 50 to 90 percent of personnel ra diation exposure can be attributed to Co-58 and Co-60, each of which contributes about equally to the exposure.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 4 Cobalt in the Reactor Coolant System is minimized by limiting the cobalt content of materials in contact with the reactor coolant. Low cobalt materials are specified for the steam generator, pressurizer, reactor coolant pump, reactor coolant loop piping, and reactor core internal structures. In addition, chemical treatment and analysis techniques are used to minimize cobalt buildup. At plant operating conditions, the primary coolant chemistry is designed to inhibit the corrosion of materials in contact with reactor coolant. At refueling sh utdowns, during the cooldown period, hydrogen peroxide (H 2 O 2) can be added to the Reactor Coolant System to oxidize and solubilize Co-58 and Co

-60. The solubilized cobalt is removed, by demineralization, prior to lifting the reactor head. These techniques minimize the concentration of Co-58 and Co-60 in the

refueling water and reduce personnel exposures during the refueling

operation. 12.2.1.4 Sources in the Chemical and Volume Control System (CVCS)

One purpose of the CVCS is to provide continuous purification of the reactor coolant water. Major equipment items include the regenerative and letdown heat exchangers, mixed-bed and cation-bed demineralizers, reactor coolant filter, letdown degasifier, volume control tank, and charging pumps. The boron thermal regeneration (BTR) subsystem contains the three BTR heat exchangers and the BTR demineralizers. The seal water subsystem for the reactor coolant pumps includes the injection and return filters, and the seal water heat exchanger. The most important ion exchangers in the CVCS, from a shielding standpoint, are the mixed-bed and the cation-bed demineralizers. The mixed-bed demineralizers are normally in continuous use. They remove fission products in cation and anion form, and are very effective in removing corrosion products. The cation-bed demineralizer is used intermittently to remove lithium for pH control, and is very effective in removing the monovalent cations cesium and rubidium. Noble gases are removed from the letdown purification flow by the letdown degasifier and are processed by the Radioactive Gas Waste System. During periods when the letdown degasifier is in service with oxygenated letdown, residual fission gases may be discharged to the plant vent via the aerated vent header. The boron thermal regeneration demineralizers are used to regulate the boron concentration in the reactor coolant water during load follow operations to remove boron from the coolant as the nuclear fuel is depleted. These demineralizers collect any remaining radioactive anions, such as iodine and bromine, which may have passed through the mixed bed demineralizer.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 5 The regenerative and excess letdow n heat exchangers are located in the Containment Building. They provide the initial cooling for the reactor coolant letdown. Their radiation sources include Nitrogen-16. The letdown heat exchanger provid es secondary cooling for the reactor coolant letdown flow prior to its entering the demineralizers. The seal water heat exchanger cools water from several sources, including the reactor coolant discharged from the excess letdown reheat heat exchanger. During boron release, the tube side of the letdown reheat heat exchanger heats the letdown water before the water enters the boron thermal regeneration (BTR) demineralizers. The geometry of the various components is described in Table 12.2-6. Locations of the equipment in this system are shown in Figure 12.3-1, Figure 12.3-5, Figure 12.3-6 and Figure 12.3-7. The source term for each component in this system has been developed individually, with regard to its function and relationship to the rest of the system. The bases and assumptions for the calculation of the source terms for the CVCS equipment follow: a. Regenerative Heat Exchanger This component contains reactor coolan t concentrations of fission and corrosion products as well as N-16 activity. The shielding source term is given in Table 12.2-5 and was used for both tube a nd shell sides of th e heat exchanger. b. Excess Letdown Heat Exchanger The source term used for shielding this heat exchanger (tube side) is the same as that used for the regenerative heat exch anger. The shell side contains cooling water. c. Letdown Heat Exchanger The tube side of this heat exchanger contains reactor coolan t concentrations of radioisotopes given in Table 11.1-1. The shell side contains cooling water.

d. Mixed Bed Demineralizers and Cation Bed Demineralizer The source terms for these components, given in Table 12.2-5, are calculated through buildup and decay of fission and corrosion products from the reactor coolant over a one-year period. Anion and cation removal efficiency of 100 percent is assumed.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 6 e. Letdown Degasifier Regenerative Heat Exchanger The source term for the tube side is demineralized reactor coolant, while the shell side is the same less the noble gases.

Isotopic source stre ngths are given in Table 12.2-5. f. Letdown Degasifier Preheater The shielding for this component is based on the tube side containing demineralized reactor coolant and the shell side containing cooling water. g. Letdown Degasifier This component is represented by three different source terms: a vapor region, a liquid-vapor region, and a liquid region. The liquid region is demineralized reactor coolant le ss the noble gases. The vapor region is assumed to be o ccupied with noble gases and carried-over iodine. The concentrations are based on an input flow of 120 gpm, a gas removal of 0.25 scfm and partition factors of 1 for noble gases and 0.0075 for iodines. The source term for the liquid-vapor region is assumed to be demineralized reactor coolant including noble gases. h. Letdown Degasifier Re circulation Pump and Letdown Degasifier Trim Cooler The source term for these components is the same as that for the degasifier liquid region. i. Volume Control Tank The source terms for this tank are based on input from the excess letdown stream which is pure reactor coolant isotopic concentrations. The liquid region source term is assumed to be reactor coolant less the noble gases. The equilibrium concentrations for the vapor region are ca lculated using an input flow rate of 120 gpm and a purge rate of 0.7 scfm. The volume control tank stripping efficiency is assumed to be 0.4. j. Charging Pumps The source term for these pumps is the same as that for the liquid region of the volume control tank.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 7 k. Seal Water Heat Exchanger The tube side of this heat exchange r has reactor coolant concentrations of isotopes. The shell side contains cooling water. l. Moderating Heat Exchanger The fluid on the tube side of this component contains demineralized reactor coolant. The shell side has the same fluid except for the iodine concentration. Iodine is assumed to be released by the boron thermal regeneration demineralizers after an accumulation period of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. m. Letdown Chiller Heat Exchanger This component contains demineralized reactor coolant (tube side) and cooling water (shell side). n. Letdown Reheat Heat Exchanger This heat exchanger contains fluid with reactor coolant concentrations on the tube side and demineralized reactor coolant on the shell side. o. Thermal Regeneration Demineralizer The input to these demineralizers is reactor coolant which has been processed by the mixed bed demineralizers. The thermal regeneration demineralizers are anion ion exchangers which accumulate iodines. The buildup of iodine is based on a fl ow rate of 120 gpm of fluid in which 10 percent of the reactor coolant iodines pass through the mixed bed demineralizers. Accumulation time is assumed to be 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. Demineralizer efficiency is taken to be 100 percent. p. System Liquid Filters Shielding for the reactor coolant filter and the demineralizer prefilter is based on a contact dose rate of 500 rem/hr. All other filters in this system are shielded for a contact dose rate of 100 rem/hr.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 8 12.2.1.5 Sources in the Residual Heat Removal System Shielding for the components of the Residual Heat Removal System is based on shutdown source terms shown in Table 12.2-7. These source terms are the reactor coolant isotope concentrations with a four-hour delay during which the Chemical and Volume Control Purification System operates. The components of this system are represented in the computer shielding code as cylinders approximating the actual geometries. The dimensions of these cy linders are given in Table 12.2-8.

The locations of the component s are shown in Figure 12.3-4. 12.2.1.6 Sources in the Steam Generator Blowdown System The input to the Steam Generator Blowdown System consists of steam generator secondary side blowdown at a rate of 75 gpm. Concentrations of isotopes on the secondary side are determined by a primary-to-secondary leak rate of 500 gpd. Isotopic composition of system input fluid is given in Table 12.2-9. Geometry of the equipment in this system is contained in Table 12.2-10. The location of the system components is given in Figure 12.3-7 and Figure 12.3-12.

The basis for the isotopic composition of the in put to the steam generator blowdown evaporator trains is for an anticipated operational occurrence involving a primary-to-s econdary leak rate of 0.5 gpm for a duration of 90 days. The locati on of the evaporator trains is shown in Figure 12.3-12. a. Blowdown Flash Tank The source concentration of the liquid is 10/7 of the system input fluid concentrations. The isotopic concentration in the steam is calculated using a carryover fraction of 0.05 and a specific volume for saturated steam at 60 psia. b. Flash Tank Bottoms Cooler The source strength of this component is the same as the liquid phase for the flash tank. c. Flash Steam Condenser and Cooler The source strength of this component is based on the carryover fraction from the flash tank and is shown in Table 12.2-9.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 9 d. Flash Tank Distillate Pumps The source term for these pumps is the same as that for the condenser/cooler. e. Blowdown Evaporator The inventory of the bottoms fluid is a 90-day accumulation of the fission and activation products from a 0.5 gpm reactor coolant leak. Specific activity is based on 1300 gallons of bottoms. f. Bottoms Pump and Bottoms Cooler Specific source term for these components is the same as the evaporator bottoms. g. Evaporator Distillate C ondenser, Distillate Accumu lator and Distillate Pump The source term for evaporator distillate is calculated using decontamination factors of 10 0 for noble gases, 10 2 for iodine and 10 3 for other fission and activation products. h. Demineralizers The Steam Generator Blowdown System demi neralizers are not utilized when the secondary side of the plant has significant contamination as noted for the conditions above. For incidental levels of contamination on the secondary side, the Blowdown Demineralizer System may be utilized as long as the general area radiation levels adjacent to the demineralizer vessels are maintained within the Zone II radiation limits. 12.2.1.7 Sources in the Boron Recovery System The input to this system has b een processed by the letdown purification system and is, therefore, demineralized and degasified. The isotopic source terms for this fluid are given in Table 12.2-11.

Input flow rate is assumed to be 341 lb/hr per unit during normal operation and 200 gpm for a unit during shutdown. System equipment geometries are descri bed in Table 12.2-12. Location of equipment is shown in Fi gure 12.3-8, Figure 12.3-9, and Figure 12.3-10.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 10 a. Primary Drain Tank Demineralizers Source term for this component buildup considers normal bleed rate (0.68 gpm/unit) for a period of one year (7008 hrs. at 80 percen t capacity factor) followed by a refueling shutdown. The isot opic content is given in Table 12.2-11. Ion removal efficiency is assumed to be zero for iodines and unity for all other isotopes. b. Boron Waste Storage Tanks Maximum anticipated inventory for a bor on waste storage tank occurs with a full tank following a shutdown. The fluid has been processed by the cesium removal ion exchanger for which the following D.F.s were assumed; 10 0 for iodines and 10 1 for all other isotopes. The source strength for this tank is shown in Table 12.2-11. c. Recovery Evaporator Feed Pump Isotopic source strength for these pumps is assumed to be the same as the input to the boron waste storage tank. d. Recovery Evaporator Bottoms concentrations of isotopes are calculated on the basis of processing one full boron waste storage tank at a feed flow rate of 25 gpm. Distillate concentrations are based on assumed D.F.s of 10 3 for iodine and 10 2 for other solids. e. Recovery Evaporator Bottoms Pump, Recovery Evaporator Bottoms Cooler, Recovery Evaporator Reboiler Pump and Recovery Evaporator Reboiler The shielding for these components is based on the source term for the evaporator bottoms concentration. This source term is shown in Table 12.2-11. f. Recovery Evaporator Di stillate Condenser, Recovery Evaporator Distillate Accumulator, Recovery Evaporator Distillate Pump, Recovery Evaporator Distillate Cooler and Recovery Test Tank Pump The shielding for these components is based on the distillate source term described in Table 12.2-11.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 11 g. Recovery Test Tank Source term calculations for this component are based on an input flow rate of 25 gpm of distillate condensate for buildup and decay through a 12-hour filling period. Activities for this component are presented in Table 12.2-11. h. Recovery Demineralizer Source term calculation for this compone nt considers a one-year buildup from recovery test tank input and a 100 percent efficiency of removal for all isotopes. The maximum inventory of activ ity is given in Table 12.2-11. i. Recovery System Filters Shielding for all filters in this system is based on 100 rem/hr. contact dose rate. 12.2.1.8 Sources in the Primary Drain System The input to this subsystem of the Boron Recovery System is the drainage from various primary side equipment. The isotopic composition and strength is assumed to be untreated reactor

coolant including all nobl e gases and iodine. This source term is given in Table 1.1-1. The geometry of each component of the system is described in Table 12.2-14. The location of the equipment in this system is shown in Figure 12.3-8, Figure 12.3-9, and Figure 12.3-10. a. Primary Drain Tank (PDT), Primary Drain Tank Transfer Pump, Primary Drain Regenerative Heat Exchanger and Primary Drain Tank Degasifier Preheater The isotopic concentrations in the source terms for these components are assumed to be the same as the reactor coolant as given in Table 11.1-1. b. Primary Drain Tank Degasifier Shielding for this degasifier is based on two different source terms, one for the intermediate liquid-steam region and th e lower all liquid region and the second term for the upper gas region. The liquid and liquid-steam source term is assumed to be reactor coolant (undemineralized) less th e noble gases. The upper region source term is taken to be noble ga s and iodine. Isotop e concentrations for this component are given in Table 12.2-13. c. PDT Degasifier Recirculation Pump and PDT Degasifier Trim Cooler The source term for these components is the same as the liquid source term for the degasifier.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 12 d. PDT Degasifier Prefilter Shielding for this filter is based on 100 rem/hr contact dose rate. 12.2.1.9 Sources in the Spent Resin Sluicing System The Spent Resin Sluicing System collects the spent resin from all the demineralizers and ion exchangers of the nuclear plant. The geometry of the components of this system is described in Table 12.2-16. The location of this equipmen t is shown in Figure 12.3-8 and Figure 12.3-9. a. Spent Resin Sluice Tank and Spent Resin Transfer Pump The source term for this equipment is based on the accumulation of the fission and activation products from the reactor coolant inventory over a period of one year. Isotopic source st rength is given in Table 12.2-15. Those isotopes with half-life of less than on e day are neglected unless produced from a long-lived isotope. b. Spent Resin Sluice Pump This pump is protected from processing the spent resin by a strainer in the spent resin sluice tank. However, the source term for this pump assumes 100 ppm of spent resin escapes the strainer, giving a source term which is 10

-4 that of the spent resin tank. 12.2.1.10 Sources in the Spent Fuel Pool Cleanup System The design basis source term for the equipment in this system was derived assuming mixing of the water in the spent fuel pool with the water in the containment refueling pool during fuel transfer. Shielding calculations use cylindrical approximations of equipment geometries.

Dimensions for the components in this system are given in Table 12.2-18. The location of the equipment in the Spent Fuel Pool Cl eanup System is shown in Figure 12.3-5. a. Spent Fuel Pool Demineralizer Shielding for this demineralizer is based on the peak activity level calculated for accumulation and decay of isotopes following initiation of the cleanup loop. This

calculation includes a four-day cleanup period of the reactor coolant followed by dilution with refueling water before mixing of reactor cavity and spent fuel pool water. No credit was taken for the diluting effect of the spent fuel pool water.

Spent fuel pool cleanup flow rate is 120 gpm. Demineralizer efficiency is assumed to be 100 percent for all isotopes. The design source term for the spent fuel pool demineralizer is given in Table 12.2-17.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 13 b. Spent Fuel Pool Demineralizer Prefilter and Spent Fuel Pool Demineralizer Post-filter Shielding for these filters is based on 100 rem/hr contact dose at change-out. 12.2.1.11 Sources in the Miscellaneous Chemical Drain System The input to this system is primarily from the drains in the chem istry lab. The shielding source term was developed from expected sample volumes and frequencies. Com position of the input is shown in Table 12.2-19. Geometry of system components is given in Table 12.2-20. Location of equipment in this system is shown in Figure 12.3-8 and Figure 12.3-17. a. Chemical Drain Tank The shielding source term for this tank is based on the system input concentrations at an average input flow rate of 103 gpd. Consideration is given to buildup and decay during the filling of this tank. The design inventory of a full chemical drain tank is given in Table 12.2-19. b. Chemical Drain Transfer Pump This pump is used to transfer the contents of the chemical drai n tank. Shielding is therefore based on the same source term. c. Chemical Drain Treatment Tank The major source of fluid for this tank is the chemical drain tank. The source term is based on buildup and decay during the filling of this tank at a rate of 103 gallons per day. 12.2.1.12 Source Terms for Water Storage Tanks The isotopic inventory of the water storage tanks is given in Table 12.2-21 and Table 12.2-22.

The location of these tanks is shown in Figure 12.3-10. The physical geometry of these components is described in Table 12.2-23. a. Reactor Makeup Water Storage Tank The inventory of this tank is based on 1 percent fuel clad defects and reactor coolant recycled by the Boron Recovery System.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 14 b. Refueling Water Storage Tank The inventory given in Table 12.2-22 is based on the refueling water storage tank refilled with cavity flood water immediately following a refueling. The reactor coolant radionuclide concentra tions prior to the refue ling preparation correspond to 1 percent failed fuel a nd the duration of the cavity flood condition is assumed to be 20 days. No credit for other decay is assumed. 12.2.1.13 Source Terms for Liquid Waste System The source terms used in shielding calculations for the equipment in the Liquid Waste System are shown in Table 12.2-24. Each component is represented by a cylinder approximating its actual geometry. The dimensions of the cylinders are shown in Table 12.2-25. The location of this equipment is shown in Figure 12.3-8, Figure 12.3-9, and Figure 12.3-10. a. Floor Drain Tank The concentrations of radionuclides that form the shielding source term for the floor drain tank are given in Table 12.2-

24. The source term is developed by

buildup and decay calculations using an input activity of 0.075 reactor coolant at a flow rate of 120 gpm. The floor dr ain tank has a capacity of 10,000 gallons. b. Floor Drain Tank Pumps Since the floor drain tank pumps serve to recirculate the water contained in the floor drain tanks, they may, at times, contain some reactor coolant without full dilution. Therefore the shielding is based on an assumed activity of 0.1 reactor

coolant. c. Liquid Waste Evaporator The source term for shielding the liquid waste evaporator bottoms is calculated with consideration of buildup and decay using the following parameters: 1. The input activity is the same as the floor drain tank concentrations. 2. Feed flow rate is 25 gpm. 3. Concentration time is 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br />. The source term for the evaporator distillate is based on a feed flow rate of 25 gpm and decontamination factors of 10 3 for iodine, 10 4 for other fission and activation products and 10 0 for noble gases.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 15 d. Liquid Waste Evaporator Distillate Condenser The liquid waste evaporat or distillate condenser contains both vapor phase distillate and liquid phase condensate. The distillate source term is the same as that for the liquid waste evaporator, while the condensate does not contain the noble gases. e. Liquid Waste Evaporator Distillate Accumulator, Pump and Cooler The source term for these components is th e same as that for the condensate in the liquid waste evaporator distillate condenser. f. Waste Test Tanks The source term for the waste test tanks (WTT) are evalua ted by calculating the buildup and decay of isotopes, given the input activity of evaporator distillate condensate at a rate of 25 gpm. Each WTT has a capacity of 25,000 gallons. g. Waste Test Tank Pumps The WTT pumps are used at times for WTT recirculation. These pumps may then contain liquid with the activity of the WTT feed, which is the same as the liquid

waste evaporator distilla te condenser condensate. h. Waste Demineralizer Calculation of the source term for the waste demineralizer considers buildup and decay of radioisotopes over a one-year service period. The input activity is the same as the WTT concentration at a flow rate of 2,750 gpd. This demineralizer is assumed to have a 100 percent effi ciency for removal of solids. i. Liquid Waste Evaporator Reboiler, Reboiler Pump, Bottoms Pump and Bottoms Cooler The source terms for this equipment are the same as that for the liquid waste evaporator bottoms described in Subsection 12.2.1.13c. j. Liquid Waste System Filters All filter cartridges will be changed when the dose rate reaches 100 rem/hr on contact. This value forms the basis for shielding calculations.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 16 k. Skid-Mounted Waste Liquid Processing System The skid-mounted system is designed a nd changeout criteria will maintain the equipment room area outside the shield wall at a zone III Radiation Area

( 15 mr/hr). 12.2.1.14 Source Terms for Radioactive Gaseous Waste System (RGWS)

There are three major sources of activity which serve as input to the Radioactive Gas Waste System: the letdown degasifier (Units 1 and 2) and the primary drain tank degasifier. Each degasifier produces efflue nt at a rate of 0.25 scfm

therefore the shielding source terms for the system are based on a gas flow rate of 0.75 scfm and are shown in Table 12.2-26 and Table 12.2-27. The RGWS also processes gas from the hydrogenated vent headers; however, this gas would dilute the concentrations of radionuclides and has not been included in the system input. The geometry of RGWS components is described in Table 12.2-28. Equipment locations are shown in Figure 12.3-12 and Figure 12.3-13. a. Waste Gas Chillers The concentrations in the waste gas chillers are the same as the system input. The inventory of isotopes for these components is given in Table 12.2-27. b. Waste Gas Dryers The specific isotopic shielding source term for these components is assumed to be the same as that for the waste gas chillers, i.e., taking no credit for iodine removal by the iodine guard beds. Each dryer contains 29 percent aluminosilicate by volume. The calculated isotopic inve ntory is presented in Table 12.2-27. c. Iodine Guard Beds The equilibrium accumulation of iodines at a gas flow of 0.75 scfm is used for the shielding source term for these components. The is otopic inventory used for shielding calculations is presented in Table 12.2-27. d. Carbon Delay Beds The source term for these components is based on a delay per bed of 12 days for Xenon and 17 hours1.967593e-4 days <br />0.00472 hours <br />2.810847e-5 weeks <br />6.4685e-6 months <br /> for Krypton at a flow rate of 0.75 scfm. The shielding inventory for each of the beds is given in Table 12.2-27.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 17 e. Hydrogen Surge Tank Shielding for this tank is based on the inventory of isotopes given in Table 12.2-27. This source term assumes th at the tank is fille d with gas at the specific activity calculated for the outlet of the fifth carbon delay bed at tank design pressure. f. Regenerative Compressor Shielding for this component is based on the same specific source term as for the waste gas dryers, given in Table 12.2-27. g. HEPA Filter The source term for this filter was calculated on the assumption that one percent of the inventory in the last carbon delay be d is transported with charcoal fines to the filter cartridge. No credit is taken for decay of isotopes after leaving the carbon delay bed. The shielding design inventory is given in Table 12.2-27. 12.2.1.15 Source Terms for Solid Waste Management System The source terms used for shielding calculations for the equipment in the Solid Waste Management System are listed in Table 12.2-29; the shielding geometry and dimensions for this equipment are presented in Table 12.2-30. The locations of this equipment are shown in Figure 12.3-8, Figure 12.3-9, Figure 12.3-10, Figure 12.3-11, and Figure 12.3-12. a. Waste Concentrates Tank, Waste Concentrates Transfer Pump The waste concentrates tank has a worki ng capacity of 6000 gallons, and can hold roughly four batches of evaporator bottoms. The shielding source terms are based upon two batches of bottoms from the boron recovery evaporat or, and one batch each from the liquid waste evaporator and the steam generator blowdown evaporator. No radioactive decay during transit has been considered. b. Waste Feed Tanks and Waste Feed Recirculation Pumps The input stream to these tanks contains about 12 percent solids by weight; after preparation/processing in the tanks, the output stream contains about 10.4 percent solids by weight. The shielding source terms for this equipment are about 0.87 of those for the waste concentrates tank described in a. above.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 18 c. Spent Resin Transfer Pump, Spent Re sin Hopper, Spent Resin Recirculation Pump, and Resin Centrifuge Metering Pump The shielding source terms for this equipment are the same as those for the spent resin sluice tank described in Subsection 12.2.1.9. d. Spent Resin Centrifuge The input resin slurry contains about 15 percent of resin by weight; after the dewatering process, the remaining contents at the discharge from the centrifuge are about 50 percent resin by weight (with no transport water). Therefore, the shielding source terms for the spent resin centrifuge are 3.3 times those for the spent resin hopper described in c. above. e. Waste Crystallizer/Evaporator, Crystallizer Recirculation Pu mp, and Crystallizer Drain Pump The input waste concentrates contains about 10.4 percent solids by weight; after crystallizer/evaporation, the remaini ng slurry is about 35-50 percent total dissolved solids by weight. Therefore, the shielding source terms for this equipment are 2.9 times those for the waste feed tanks described in b. f. Concentrates Bottom Tank, Concentrates Bottom Tank Recirculation Pump, Waste Metering Pump, and Alternate Station Concentrates Feed Pump The shielding source terms for this equipment are the same as those for the waste crystallizer/evaporator described in e. above. g. Entrainment Separator, Crystallizer Conde nser (Shell Side), Cr ystallizer Distillate Tank, Crystallizer Distillate Pumps, and Crystallizer Subcooler (Shell Side)

This equipment is not expected to contai n significant radioactivity; the fluids are expected to contain about 1 ppm of solid s by weight. The shielding source terms for the equipment are about 8.3x10

-6 of that for the waste concentrates tank described in a. h. Spent Resin Dewatering Pump This equipment is not expected to carry significant radioactivity. For conservatism, and consistency with the guidance given by NUREG-0017, the shielding source terms for this equipment are taken to be the same as those for the resin sluice pump descri bed in Subsection 12.2.1.9.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 19 i. Crystallizer Reflux Pot and Crystallizer Reflux Pump This equipment is not expected to cont ain significant radioactivity. The shielding source terms for this equipment is taken to be the same as those for the crystallizer distillate tank described in g.

j. Extruder In the extruder, spent resins or crystallizer bottoms are mi xed with the asphalt binder in a one-to-one ratio by weight. The shielding source terms for this equipment are 0.5 times those for the spent resin centrifuge described in d. 12.2.2 Airborne Radioactive Material Sources The major source of airborne contamination during normal operation is leakage of radioactive fluid from equipment and valves. Other sources from anticipated occurre nces include opening of sealed equipment and evaporati on during fuel handling. Accident sources such as DBA, fuel handling accident, and radwaste system failures are discussed in Chapter 15. 12.2.2.1 Design Basis The ventilation system was designed to maintain the normal airborne radioactivity concentration to levels below the applicable occupational concentration values listed in 10 CFR 20 for air. On May 21, 1991, a complete revision to 10 CFR 20 was issued. Several design bases reference 10 CFR 20 and specific terms or parts of 10 CFR 20. Design bases information provides a historical perspective of the information used to formulate a particular design. References to 10 CFR 20 when used in a historic al or design bases context have not been changed to reflect the revised 10 CFR 20.

Air flow is directed from areas of high occupancy and low airborne radioactive concentrations to areas of increasing contamination and lower occupancy requirements. Design basis maximum leakage rates to various buildings and compartments were chosen in accordance with NUREG-0017, as referenced by Regulatory Guide 1.112. Specific isotopic ac tivity of the fluid leakage is based on 0.25 percent fuel clad defects, as discussed in Subsection 11.1.1.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 20 12.2.2.2 Leakage Sources

a. Containment The design basis maximum daily leakage to the Containment, as recommended in NUREG-0017, is 1 percent of the reacto r coolant noble gas inventory and 0.001 percent of the iodine inventory. Reactor coolant isotopic concentrations for 0.25 percent failed fuel are listed in Table 11.1-1. The containment ventilation purge systems are designed to reduce airborne concentrations to acceptable levels within 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> after shutdown. Specific airborne concentrations in the Containment at shutdown and following purging are presented in Table 12.2-31 and Table 12.2-32. b. Turbine Building Calculating maximum airborne contamination in the Turbine Building assumes the leakage of 1700 pounds per hour of steam with the spec ific activities described in Table 11.1-4. Building volume, ventilation rates for summer and winter, and airborne isotopic concentrations are listed in Table 12.2-33 and Table 12.2-34. c. Auxiliary Buildings Several areas in the Primary Auxiliary Building have a concentration of piping and valves with a potential for significant co ntributions to airborne contamination. None of these areas requires continuous occupancy. The design basis maximum leakage rate to the Primary Auxiliary Building, per NUREG-0017, is 20 gpd. The source for these areas is reactor coolant with 0.25 percent fuel clad defects, as presented in Table 11.1-1. Airborne concentrations are presented in Table 12.2-35 for the average contaminated area. 12.2.2.3 Movement of Spent Fuel The most significant contribution to airborne radioactive contamination during the movement of spent fuel is from tritium released by evaporation from the surface of the spent fuel pool and the refueling canal. The design concentration of tritium in the spent fuel pool a nd the refueling canal is 0.63 microcuries per milliliter. Tritium concentration in the water is controlled by release; in liquid form through the Boron Recovery System and in gaseous form via the ventilation system and the plant vent.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 21 Airborne concentration is contro lled by the ventilation system. Design air flow rates and tritium concentration are presented in Table 12.2-36 and Table 12.2-37.

Evaporation rates of 270 lb/hr for the refueling canal (140°F) and 378 lb/hr for th e spent fuel pool (175°F), which were used in the design calculations, assumed an air temperature of 50°F and a relative humidity of 20 percent. 12.2.2.4 Reactor Vessel Head Removal The potential for release of airborne contamination due to reactor vessel head removal is significantly affected, and to a large degree controlled, by operating procedures and timing following shutdown. First, the reactor coolant is diluted with water from the reactor makeup water storage tank and/or the boric acid tanks via the Chemical and Volume Control System during cooldown. Then, there is a time lag between shutdown and vessel head lift (minimum 4 days) which allows decay. Letdown purification and degasification also continue during this time interval. Finally, the reactor coolant in the vessel is diluted by water from the refueling water storage tank by way of the Residual Heat Removal System. If necessary, portable fans can be used to mix the air in the ve ssel head area with the general cont ainment air circulation to take advantage of the 40,000 cfm refueling purge flow rate.

12.2.2.5 Relief Valve Venting Relief valves with significant potential for contribution to airborne contamination do not vent to building atmosphere. The relief valves on tanks and piping containing nondegasified fluids discharge to the primary drain tank. The primary drain tank, in turn, vents to the hydrogenated vent header for processing through the Radioactive Gas Waste System prior to environmental release. 12.2.2.6 Calculation Models and Parameters Radionuclide input rates to building atmospheres were determined using assumed leakage rates of radioactive fluid to in-plant areas and corresponding specific activities and partition factors.

Calculations of the various airbor ne isotopic concentrations of interest were performed using the UE&C computer code HDOSE. The code determines isotopic concentrations from specific radionuclide input and removal processes, and allows simulation of specified, pre-determined time behavior for such processes. In performing these calculations, credit was taken for the following removal mechanisms: a. Natural radioactive decay

b. Recirculation - air is taken from building atmosphere, filtered, and returned to the building S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Sources Revision 12 Section 12.2 Page 22 c. Purge - outside air is drawn into the building and interior air is expelled to the outside. (Recirculation and purge proceed with a mixing efficiency of 70 percent.) Also taken into account was the formation of airborne radionuclides from: a. The decay of airborne parent species

b. Trapped filterable parent species which decay to unfilterable daughters (e.g., iodine to xenon).

The rate equation used in HDOSE to describe the activity of isotope "j" in a compartment is given by: jc,ejrjkr,kjk,1,2kkc,kjk,1,2k jNLeLNBgjNBR dtjdNc, where:

Nc, j = activity of isotope "j" in the compartment

R j = release rate of isotope "j" into the compartment (Ci/hr) j = radiological decay constant of isotope "j" k = radiological decay constant of isotope "k" Bk,j = branching ratio of decay from isotope "k" to isotope "j" (k=1 indicates parent of "j", k=2 indicates grandparent)

N r,k = accumulation of nuclide "k" on recirculation filter g j = 1 for gaseous isotope "j" 0 for nongaseous isotope "j" e j = recirculation cleanup filter efficiency for isotope "j" L e = compartment leak rate or purge rate L r = filtered recirculation flow rate.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 1 12.3 RADIATION PROTECTION DESIGN FEATURES 12.3.1 Facility Design Features The radiation protection philosophy for the design of Seabrook Station is to restrict radiation exposure to plant personnel and the general public to within the limits of 10 CFR 20 and 10 CFR 50, while ensuring high fl exibility and availability w ithin the power generation and safety objectives of plant operation. This philosophy can be summarized in several basic design goals intended to minimize exposures: a. To minimize, to the extent possible, the production of radioactive isotopes, e.g., the steps taken to reduce crud pr oduction described in Subsection 12.2.1.3. b. To minimize the extent of areas housing radioactive equipment and piping through efficient arrangement of equipment and systems. c. To shield the normally occupied areas from radiation. d. To minimize exposures within high radiation areas by, first, controlling access to those areas, and secondly, through design of systems and equipment for reliability and ease of maintenance. The plant is designed to permit periodic online equipment inspection and maintenance, radioactive material handling, decontamination and cleanup, and access to vital plant areas during normal plant operation, including anticipated operational occurre nces. Postulated accidents are also considered in the determinati on of radiation exposure of Engineered Safety Features and other materials. In addition, these accidents are evaluated for access to, and habitability of, the control room, including ingre ss and egress, for the duration of the accident. Offsite radiation exposures following postulated accidents are discussed in Chapter 15; those from processed radioactive material releases during normal operation are discussed in Chapter 11. The primary objective of plant shielding is to provi de for the protection a nd safety of all plant personnel and the general public under all normal and anticipated abnormal plant operating conditions. Reactor shielding, along with the radiation monitoring system and access control procedures, supplemented by periodic radiation surveys and radiochemical analysis, ensure that radiation exposures of the general public and plant personnel do not exceed the limits set by the federal regulatory agencies. The maximum allo wable design dose rates for all plant areas, in conjunction with anticipated occupancy, limit the integrated whole body dose to less than 5 rem per calendar year. All areas that house radioactive materials are appropriately marked in accordance with Part 20 of T itle 10 of the Code of Fede ral Regulations (10 CFR 20).

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 2 Plant operating personnel and the general public ar e protected by radiation shielding wherever a potential radiation source may exist. The shielding design philosophy embodies the following objectives: a. To restrict the potential radiation dose to operating personnel during normal operation to within the limits of 10 CFR 20. b. To adequately protect the operating personnel in the unlikely event of an accident, in order to allow termination of accident conditions and mitigation of the consequences without undue ri sk to the general public. c. To protect equipment from excessive radiation exposure to prevent malfunctions due to radiation-induced failures. d. To maintain the radiation exposure of the general public from normal operation to within the limits of 10 CFR 20.

The guidance provided by Regulator y Guide 8.8 has been utilized extensively in the plant radiation protection design philosophy, as descri bed in the following pages of this section.

The radiation sources and associated input parameters, assumptions, and methodology described in Section 12.2 represent those used to establish original shielding design. The radiation sources utilized for the design of the primary shield we re developed by the reactor vendor and are based on a standard four loop Pressurized Water Reactor. The radiation sources in the spent fuel and the N-16 source were also developed by the reactor vendor, and are based on a reactor power of 3565 MWt. The radiation sources in the primary coolant system and the auxiliary systems are based on a reactor power of 3654 MWt, a one-year fuel cycle, and 1 percent fuel element defects. The impact on plant shielding requirements was evaluated for an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle. This represents a minor change from the original design basis. The conservative analytical techniques used to establish the original shielding requirements, and the Station Technical Specification which will restrict the reactor coolant activity to levels significantly less than th e 1 percent fuel defects, ensure that operation at the licensed core power level will have no significant impact on shielding requirements and safe plant operation. 12.3.1.1 Radiation Zones and Access Control The shielding design bases for work areas are a combination of the desi gn radiation level and anticipated occupancy times. The plant is di vided into zones dependent upon the intensity of radiation within the given area. Areas within these zones are posted in accordance with the regulations of 10 CFR 20. Occupied areas within a zone are limited to the same radiation ranges as prescribed for that zone. Zone classifica tions are presented in Ta ble 12.3-1 and Table 12.3-2.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 3 Zone boundaries, decontamination facilities and location of radi ation monitors are shown in Figure 12.3-1, Figure 12.3-2, Figure 12.3-3, Figure 12.3-4, Figure 12.3-5, Figure 12.3-6, Figure 12.3-7, and Figure 12.3-8, Figure 12.3-9, Figure 12.3-10, Figure 12.3-11, Figure 12.3-12, Figure 12.3-13, Figure 12.3-14, Figure 12.3-15, Figure 12.3-16, and Figure 12.3-17. The arrangement of the chemistry lab, health physics facilities and counting room is shown in Figure 12.3-17. Shield wall thicknesses for all major sources of radiation are given in Table 12.3-3, Table 12.3-4, Table 12.3-5, Table 12.3-6, Table 12.3-7, Table 12.3-8, Table 12.3-9, Table 12.3-10, Table 12

.3-11, Table 12.3-12, and Table 12.3-13.

Access control points are also shown in Figure 12.3-1, Figure 12.3-2, Figure 12.3-3, Figure 12.3-4, Figure 12.3-5, Figure 12.3-6, Figure 12.3-7, Figure 12.3-8, Figure 12.3-9, Figure 12.3-10, Figure 12.3-11, Figure 12.3-12, Figure 12.3-13, Figure 12.3-14, Figure 12.3-15, Figure 12.3-16, and Figure 12.3-17, while discussion of access control and its implementation can be found in Section 12.5. The entire Containment Building is a controlled access area. The turbine generator structure areas, administrative offices, turbine plant service areas and the control room are designated Zone I. Areas such as the local control space in the Primary Auxiliary Building, the waste disposal area, and the operating deck of the spent fuel storage area, are generally designated Zone II. Intermittently occupied work areas, such as valve galleries, are designated Zone III. Typical Zone IV areas include steam generator compartment areas (after reactor shutdown) and areas outside of containment pipe penetrations. A typical Zone V is the volume control tank area. Certain areas of the Containment are accessible for a limited time during normal plant operation. The radiation counting room is designated Zone I (less than 0.5 mrem/hr); however, sufficient shielding is provided to assu re that the backgr ound dose rate is low enough (less than 0.1 mrem/hr) to permit accurate operation of counting equipment.

Shielding has been designed by identifying source strengths within an area and then providing sufficient shielding to achieve the specified dose rate in adjacent zones. The source strengths are based on 1 percent failed fuel and maximum expected activation product levels , so that the actual radiation levels experienced within the station are expected to be less than the design values.

Concrete shield thickness was in most cases determined by rounding from the calculated required thickness to the next higher 6-inch increment. In a few cases, where space was limited, the next 3-inch increment was used. 12.3.1.2 Handling of Nuclear Materials Most systems included in the Primary Auxiliary and Waste Processing Buildings are used to process the radioactive byproducts produced in, and which leak from, the Reactor Coolant System during normal power operation. The design of the systems in the letdown purification and general waste processing systems reflects the concept of minimizing the exposure of plant personnel.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 4 New fuel handling is disc ussed in Subsection 9.1.4.

Storage and handling of radioactive s ources is discussed in Subsection 12.5.3.7. 12.3.1.3 Shielding and Layout Features

a. Plant Layout Plant layout includes optimal location of radioactive components. The most radioactive systems are located toward the interior and on the lower plant levels, with less radioactive systems located toward the outside. The plant layout provides for personnel access which maintains occupational doses as low as reasonably achievable (ALARA). Passag e through a higher radiation area to obtain access to a lo wer radiation area is avoided, thus minimizing unnecessary accumulation of occupational exposure. Wherever practical, components are sh ielded individually to keep exposure ALARA during maintenance periods. Shielded pipe chases are utilized extensively to segregate radioactive piping from normal occupied areas. Reach rods are used where required to place the operator in a low radiation area during valve operation. Auxiliary control board s are located with ALARA occupational exposure in mind. When sources of sufficient strength are present, labyrinth entrances are utilized to minimize the contribution in the walkways. One or two scatter labyrinths are

used as required by scattering calculations. Periodic review of plant design and equipment arrangement aimed at maintaining occupational radiation exposures (ORE) ALARA resulted in a number of design changes, as illustrated in the examples below: 1. Access to the stairways in the RHR Vaults may be restricted below elevation 3'-2" due to equipment and pipe shine. 2. Shielding above the demineralizers in the Primary Auxiliary and Waste Processing Buildings was increased. 3. Primary sample heat exchanger and sink room was rear ranged to reduce shine. 4. Evaporator equipment was rearranged to minimize radiation levels in adjacent walkways. 5. Areas of potentially excessive radiat ion levels were id entified and space for possible future shielding was reserved.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 5 b. Equipment Layout The criteria for the arrangement of equipment containing radioactive sources were developed specifically for maintaining occupational doses ALARA and for ease of maintenance. 1. Filters (Liquid)

(a) Each potentially radioactive filte r is located inside an individual shielded compartment. This minimizes the contribution to radiation levels from adjacent filters during maintenance periods.

One exception to this are the vendor supplied waste liquid processing system filters. These filters may be in a common shielded compartment with demineralizer vessels, or outside a shielded area if the expected dose is Zone III or lower. (b) For PAB and WPB filters, where changeouts are required, adequate space is provided for use of the remote filter handling cask in removing the filter (lateral room to swing the vessel head clear, and head room for lifting the cartridge), loading the filter into the cask, and transportation to the solid waste area. Attention is given to ensure that there are no interferences or obstructions in the path. The shield wall for waste liquid processing equipment is vendor supplied for the vendor system. This ensures interferences or obstructions in filter/resin manipulations are accounted for. (c) All valves and instrumentation associated with filters are located outside the compartment. Norma lly, filter process valves are operated by remote manual mechanical linkage which extends to a low radiation zone, to minimize operator exposure during normal operation. Where practical, filters are located near the solid waste area to minimize the chance of spillage in transit. 2. Demineralizers The primary means of processing radioactive water to be discharged is through a vendor-supplied system. This system meets the intent of the design requirements in Regulatory Guide 1.143 and NUREG 0800. (see

Section 1.8)

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 6 Other aspects of radioactivity processing systems are:

(a) Capability is provided to remotely remove all primary- side resins by flushing. All initially installed resin trans port lines are designed to avoid resin traps. Butt welds instead of socket welds and five diameter bends instead of fittings are used in downward-sloping pipe without any sections horizontal or upward-sloping. Procedural controls are in place to prevent normal access during times of elevated dose rates. (b) The resin fill line is shaped to prevent direct radiation streaming. (c) Each potentially radioactive primary-side demineralizer in the Primary Auxiliary Building and Waste Processing Building is located inside shielded compartments or cubicles in order to reduce shielding problems during maintenance periods. (d) All valves and instrumentation associated with these demineralizers are located outside the compartment. All demineralizer process valves, except for the vendor-supplied system, are operated by remote manual mechanical linkage which extends to a low radiation zone to minimize operator exposure during normal operation. The vendor-supplied system is designed

to process water from floor dr ain tanks. The vendor-supplied components which concentrate radionuclides are all shielded to reduce any potentially elevated dose rates. (e) Only the required process lines enter into, or pass through, the demineralizer cubicles, as access to the cubicles during normal operation will be strictly controlled.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 7 (f) The demineralizers associated with the Steam Generator Blowdown System are not located in individual shielded cubicles, and are not provided with the capability for remote sluicing. These units normally treat secondary coolant with only minor or no contamination present. Processing blowdown through these demineralizers is based on maintaining the general area near the

vessels as a radiation Zone II (<2 mr/hr). If significant primary-to-secondary leakage occurs, the primary method to process radioactive secondary liquid from the steam generators is

to direct steam blowdown flash tank bottoms cooler discharge to the floor drain tanks. If no sec ondary pressure is available, the steam blowdown and wet lay-up pumps can be used. From the floor drain tanks, processing through the installed vendor system (WL-SKD-135) to the waste test tanks is the preferred method (reference Subsection 11.2.2.1). In addition blowdown processing may be through the blowdown ev aporators in place of the Blowdown Demineralizer System. 3. Adsorber Beds (a) The first and second waste gas adsorber beds are located in individual shielded compartments. (b) The third-through-fifth beds are located in a common compartment with the most active bed farthest from the entrance. (c) All valves are located outside th e bed cubicles, and can be operated from a low radiation area. 4. Recombiners (a) Post-accident recombiners are located inside the Containment Building, and are designed for operation in the accident environment. (b) Shielding is provided by the 41/2-foot-thick containment walls.

5. Tanks (a) Tank overflow lines are connected to prevent spillage on the floor and to prevent dissolved gases from escaping the tank. In limited cases the overflow lines are di rected toward floor drains. (b) Controlled ventilation is provi ded for tanks containing aerated or hydrogenated fluids.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 8 (c) Tanks located outside of heat ed buildings are protected from freezing by steam heating panels. (d) Manual valves are located in, or have handwheel extensions to, low radiation zones.

6. Evaporators (a) Shielding is provided for individual evaporator units. (b) Instruments, valves in service lines, and evaporator sample points are located in low radiation zones. (c) Connections are provided for flushing and draining of pipe and equipment prior to maintenance. 7. Pumps (a) In order to perform major mainte nance in as low a radiation zone as reasonably achievable, the pump or motor can be decontaminated, if necessary, and moved to a low radiation area. Temporary local shielding may also be used. (b) Pumps are designed with double mechanical seals to give a minimum leakage of radioactive fluid. (c) Remote instrumentation and sw itching is provided, as required. 8. Steam Generators The portions of the steam generators containing reactor coolant are

shielded by the 4-foot-thick secondary shield walls. 9. Sampling Station (a) The sample sink room is separated from the sample heat exchangers by a shield wall. (b) Sample rates are limited to 1.5 gallons per minute by design. (c) The sample hood is ventilated to prevent the accumulation of gases. (d) The sample system is designed for a closed system line purge prior to sampling. (e) Shielding is provided at local sampling points, as required.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 9 10. Penetrations (a) Where possible, penetrations thr ough shield walls are offset from line-of-sight of the source. (b) Where necessary, the annulus between a pipe and its sleeve is packed with lead wool or lead-silicone foam with a nominal density of 150 lb/ft

3. 11. Instrumentation (a) Drains from instrument blowdowns are routed to radioactive drains. (b) Diaphragm seals or clean water seal legs are used, wherever practical, to minimize the volume or radioactive fluids entering low radiation areas via instrument impulse lines. (c) Radioactive gas and liquid samples are returned to process lines wherever practical. (d) Wherever practical, instruments are located in low radiation zones to permit extended access for calibration and testing. 12. Piping and Valves In order to minimize concentrated pockets of crud in permanently installed radioactive systems: (a) Piping 21/2" and larg er is butt-welded.

(b) Spent resin sluicing lines utilize five diameter bends to minimize the number of fittings. (c) Valves are selected to avoid crud pockets.

(d) Piping layout avoids pockets wherever possible.

12.3.2 Shielding The material most commonly employed for shielding is concrete. Where space is limited, steel or lead is substituted for ordinary concrete in equivalent thicknesses. Whenever cast-in-place concrete is replaced by concrete blocks (removable or fixed), the design assures protection on an equivalent shielding basis.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 10 Analytical models were selected according to the source geom etry under consideration. Tanks, vessels, and large pipe-sections containing radioactive materials were shielded by considering uniform cylindrical volumetric sources. Appropriate line source approximations were used for small pipes and tall vessels with small diameters. For a conservative estimate of dose rate, sources of irregular geometry were modeled by a point source of strengt h equivalent to the volumetric source.

The following techniques, codes, models, and assumptions were used: Point kernel integration methods were used. Buildup factors were accounted for inside the integrals.

Self-shielding was taken into consideration.

Concrete density was assumed to be 2.35 gm/cc.

The maximum calculated shield thickness was specified for each component or radiation area. Source term data corresponds to 1 percen t failed fuel with a power level of 3654 MWt. Special protective design features to ensure that occupational radiation exposures will be ALARA are described in Subsection 12.3.1.3. The guidance given in Regulatory Guide 8.8 can be seen in these features. Compliance with Regulatory Guide 1.69 is addressed in Section 1.8. 12.3.2.1 Shield Configurations

a. Reactor Shielding

1. Primary Shield The primary shield is a large mass of reinforced concrete, 71/2 feet thick at core midplane, that surrounds the re actor vessel and extends upward from the containment floor to form the walls of the refueling cavity. The primary shield is designed to: (a) Reduce, in conjunction with th e secondary shiel d, the radiation level from sources within the reactor vessel and Reactor Coolant System, and allow limited access to the Containment during normal operation. (b) Limit the radiation level after shutdown from sources within the vessel, and permit limited access to the areas containing reactor coolant system equipment.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 11 (c) Limit neutron flux activation of component and structural materials over the life of the plant. 2. Secondary Shield The secondary shield is a reinforced-concrete structure that surrounds the reactor coolant equipment, pipes, pumps and steam generators. This shield protects personnel from gamma radiation emanating from reactor coolant activation products and fissi on products that are transported from the core by the reactor coolant. The neutrons emitted by the decay of carried-over N-17 are effectively eliminated by the concrete shielding employed for N-16. The secondary shield also supplements the primary shield function of attenua ting direct core radiation. In addition, it permits limited access to the Containment during normal operation so that inspection of essential equipment ma y be accomplished without requiring plant shutdown. 3. Neutron Shield In order to reduce dose rates and equipment activation on the containment operating floor during power operation, a supplementary shield has been designed to minimize the streaming of neutrons from the reactor cavity. A neutron shield consisting of Reactor Experiments Type 277 borated

concrete, and which is integral to the permanent reac tor cavity seal ring, is installed around the reactor vessel refueling flange. The neutron shield is suspended from the permanent seal ring and fills the annular area between reactor vessel refueling flange and the cavity wall. The neutron shield is approximately fourteen inches thick and supported from the bottom by a

one-inch thick steel plate. Sectional and plan views of the permanent reactor cavity seal ring/neutron sh ield are shown in Figure 6.2-26 and Figure 6.2-28, respectively.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 12 b. Containment Shielding The containment shielding is a steel-lined, reinforced-concrete containment structure that completely surrounds the reactor building equipment. At full power operation, this shield attenuates the radiation level outside the primary-secondary shield complex, including radiation sources which become airborne during normal operation due to primary system leakage, to ensure that radiation levels outside the Containment are less that 0.5 mrem/hr. The containment structure also shields against radiation sources inside the Containment due to fissi on products released following postulated accidents. The integrated direct dose is less than 260 mrem immediately outside the Containment over a period of two hours after the design basis accident (DBA), which will permit access to such vital areas as the control room. The containment wall and dome are 41/2-feet and 31/2-feet thick, respectively. c. Spent Fuel Shielding This shielding provides protection during all phases of spent fuel removal and storage. Operations that require shielding of personnel are spent fuel removal from the reactor, spent fuel transfer through the refueling canal and transfer tube, spent fuel storage, and spent fuel shippi ng cask loading prior to transportation. All spent fuel removal and transfer operations are performed under borated water to provide radiation protection. All accessible areas around the tube and canal are shielded.

All shields were designed for a contact radiation dose rate of less than 100 mr/hr. Four inches of lead plate were added between the liner and concrete at the bottom of the canal.

In the Enclosure Building a shield box was designed around the tube. This box consists of approximately 300 bricks weighing 50 pounds each. These bricks will be explicitly marked with a sign stating that potentially lethal radiation fields are possible if the bricks are removed during fuel transfer. The access point noted in Figure 1.2-3 is an inspection hatch (manway). This hatch is shielded with a three-foot concrete plug. This plug shall also be marked as noted above. Minimum allowable water depth above a fuel assembly during fuel handling is 10 feet in the reactor cavity. This limits the dose at the water surface to less than 10.0 mrem/hr for an assembly in a vertical position. The minimum water depth in the spent fuel pool is 13 feet above the top of the fuel assemblies in the storage racks. For this depth, the dose rate at the water surface is less than 2.5 mrem/hr. Normal water depth above the stored assemblies is about 25 feet.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 13 The 5-foot thick concrete walls of the fuel transfer canal and the 6-foot thick spent fuel pool walls supplement the water shielding, and limit the radi ation dose levels in most working areas to less than 2.5 mrem/hr, and a maximum dose in some areas less than 100 mrem/hr. The refueling water and concrete walls also shield pers onnel from activated control rod clusters and reactor internals that are removed at refueling times.

Dose rates are generally less than 2.5 mrem/hr in wo rking areas. However, certain manipulations of fuel assemblies, control rod clusters, or reactor internals may produce short-term dose rate levels in excess of 2.5 mrem/hr. Radiation levels in the working areas will be closely monitored during refueling operations to ensure that exposures for plant personnel do not exceed the integrated doses specified in 10 CFR 20. d. Control Room Shielding The control room shielding is designed in accordance with applicable regulations, to permit continuous occupancy by control room personnel following a DBA. This enables control room operators to maintain full control and to shut down the plant without personal hazard. The control room shielding is 2-feet thick, based upon an integrated dose during the 30 da ys following the DBA which does not exceed 5 rems whole body, or its equivalent to any part of the body, as required by General Design Criterion 19 of 10 CFR 50, Appendix A. A layout drawing of the control room is shown in Figure 1.2-32. e. Plant Auxiliary Systems Shielding Auxiliary shielding includes all concrete walls, covers and removable blocks that shield the numerous radiation sources in the radioactive waste disposal, makeup and purification, and chemical addition and sampling systems. Typical components that require shielding include the volume control tank, thermal regeneration demineralizers, waste drumming area and reactor coolant system drain tank. Shield wall thicknesses for components in auxiliary systems are given in Table 12.3-3, Table 12.3-4, Table 12.3-5, Table 12.3-6, Table 12.3-7, Table 12.3-8, Table 12.3-9, Table 12.3-10, Table 12.3-11, Table 12.3-12, and Table 12.3-13. f. Turbine Shielding The radioactive material inventory in the Turbine Building is very small since only secondary steam enters the area with small amounts of primary coolant leakage. Shielding is not, therefore, a major concern here, with wall and floor thicknesses determined from structural considerations.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 14 g. General Plant Yard Areas All shielding is designed so that the dose rates in plant yard areas which are frequently occupied by plant personnel remain below 0.5 mr/hr. These areas are surrounded by a security fence, and are closed off from areas accessible to the public for general safety. 12.3.2.2 Plant Shielding to Provide Access to Vital Locations for Post-Accident Operations Following an accident, significant radioactivity may be released from the reactor core, presenting unusual hazards to operating personnel. A review was conducted to assess the projected amount of activity released, systems invol ved in transport of this activi ty, effect of the transported activity on plant dose rates and acceptability of dose rates in locations requiring access for necessary operations (vital locations). This assessment employed core fission product release source terms consistent with NUREG-0737,Section II.B.2 (100% noble gas, 50%

halogen, 1% other fission product). The assessment addressed both pressurized and depressurized accidents, and projected consequences of the release at post-accident times ranging from the onset of cold leg recirculation to 1 year. The assessment was based on an analyzed power level of 3565 MWt and a 1-year fuel cycle length. The systems considered in this assessment included containment spray, chemical and volume control, safety injection, residual heat removal and combustible gas control. Using the source term and system transport information described above, dose rates in various plant areas where projected. These projections c onsidered shine, scatter and radiation streaming, including effectiveness of facility shielding. Levels in areas which must be accessed for operational tasks (vital locations) were tabulated, along with occupancy times, to verify projected exposures are within applicable limits. Such locations included the control room, technical support center, post-accident sample station, chemistry laboratory, switch gear room, radwaste control station, radiation contro lled area tunnels and hydrogen an alyzer area. High dose-rate areas are graphically depicted on area zone maps of the plant. These maps will aid in projecting exposures for potential post-accident operations not explicitly identified in the vital location table. Results of these projections demonstrate projected exposures in vital locations are within the GDC-19 and NUREG-0737 (Item II.B.2) criteria. The assessments described above were incorporat ed into the Post-Accid ent Dose Engineering Manual, which is used in planning for post-accident operations. Rationale for not including several areas noted in NUREG-0737 (Item II-B.2) is delineated in this manual. A copy of the manual was provided to the NRC. The information in this document will be factored into the overall post-accident response actions.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 15 The impact of an analyzed core power level of 3659 MWt and operation with an 18-month fuel cycle was evaluated, and it was determined that the post-accident operator exposure will continue to remain within regulatory limits. The information from the Post-Accident Dose Engineering Manual, modified to reflect the licensed core power level, is factored into the overall post-accident response actions.

12.3.3 Ventilation The station ventilation system has been designed to provide a maximum of safety and convenience for operating personnel, construction wo rkers and site visitors working both within

the station radiologically controlled area and in station buildi ngs outside the radiologically controlled area during normal operating and antici pated operational occurrences. The potential exposure to onsite personnel and to members of the general publ ic resulting from airborne radionuclides from station operation complies with 10 CFR Part 20 and 10 CFR Part 50, respectively. 12.3.3.1 Ventilation Design Bases Descriptions of the ventilation systems for each building which can be expected to contain radioactive materials, in cluding design bases, are contained in Section 9.4. Diagrams associated with the descriptions show equipment, air flow patterns, and expected flow rates for normal and emergency conditions.

A description of the ventilation systems for the control room complex is contained in Subsection 9.4.1, Figure 9.4-1, Figure 9.4-2, and Figure 9.4-3, and shows equipm ent, air flow patterns, and expected flow rates. Section 6.4 discusses the habitability and life support systems of the control room complex with respect to NRC General Design Criterion 19.

In each case, air flow has been directed from areas of low poten tial airborne radioactivity to areas of higher airborne radioactivity by exhausting from the areas of higher radioactivity. The ventilation rate for the areas of higher radioactivity was determined both from the ventilation rate required to remove equipment heat, piping and electrical losses and from the ventilation rate required to control the concentrat ion of airborne radioactivity. The ventilation was designed to meet the exposure limits for airborne concentrations listed in 10 CFR 20. Maintenance of a negative pressure by the exhaust systems in the ar eas of higher radioactivity induces an air flow from corridors and operating areas preventing the exfiltration of airborne radioactivity to clean areas normally occupied by operating or maintenance personnel.

Testing and maintenance will be performed in accordance with the criteria presented in Regulatory Guide 1.52 for the safety-related filter systems. Failure to meet these in-place testing criteria will necessitate the change-out of filters or adsorbers.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 16 12.3.3.2 Provisions for Localized Ventilation Provisions for localized ventilation during maintenance and refue ling operations are provided to the extent practicable to reduce concentrations of airborne radioactivity in areas not normally occupied where maintenance of in-service inspection has to be performed. 12.3.3.3 Exhaust Filtration The exhaust from each area which can be expected to contain significant airborne radioactivity is processed through HEPA or HEPA and carbon air cleaning systems before being discharged to the unit plant vent.

Air cleaning units are provided for the containment enclosure emergency exhaust, the fuel storage building emergency exhaust, the containment purge exhaust, the primary auxiliary building exhaust for areas with a potential for significant airborne radioactivity, and the waste processing building exhaust for areas with a potential for higher ai rborne radioactivity. In addition, recirculation air cleaning units are provided for the main control rooms and the containment structures. Descriptions of the air cleaning systems, including design bases for the containment enclosure emergency exhaust and the fuel storage building emergency systems, including the design bases for the remainder of the buildings, are contained in Section 9.4.

Compliance with Regulatory Guide 1.52, Revision 2, of the containment enclosure emergency air cleaning unit, the fuel storage building air cleaning unit, and the control room emergency filtration subsystem is detailed in Table 6.5-1, Table 6.5-2 and Table 6.5-3 respectively. The containment purge exhaust air cleaning unit, the primary auxiliary building normal exhaust air cleaning unit and the waste processing building air cleaning unit are equipped with quick-release filter clamps to minimize exposure of maintenance personnel when changing prefilters, medium efficiency filters and HEPA filters. The remainder of the air cleaning units employ standard threaded filter clamping devices because they are not expected to be exposed to more than minimal quantities of radioactive particulates. The containment purge exhaust air cleaning unit, the primary auxiliary building normal exhaust air cleaning unit, the fuel storage building emergency exhaust air cleaning units and the containment enclosure emergency exhaust air cleaning unit are provided with bulk fill adsorber beds and guard beds, where applicable. The carbon for the adsorber and guard beds is pneumatically removed and filled, which minimizes exposure of the maintenance personnel to contaminated carbon. The control room emerge ncy recirculation air cleaning unit and the containment recirculation air cleaning unit employ tray-type carbon adsorbers. The waste processing building air cleani ng unit has no adsorber bed.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 17 Access from both sides of the air cleaning units for maintenance and changing of filters is provided for the containment purge exhaust air cleaning unit, the fuel storage building emergency exhaust air cleaning unit and the primary auxiliary building normal exhaust air cleaning unit. Aisle space and clear means of i ngress and egress are provided for the handling of filters and carbon bed carbon removal/fill equipment. A layout of the primary auxiliar y building normal exhaust unit pr ovided in Figure 12.3-18 is an example of the filter bank spacing and access for maintenance.

The radiation control area (RCA) of the Administration and Servic e Building is provided with a once-through ventilation system. The exhaust system maintains a negative pressure on the entire RCA portion of the building, preventing the exfiltration of airborne radioactivity to the clean areas. The exhaust air is processed through 55 percent medium efficiency filters and then through HEPA filters. There is no adsorber bed provided for this system. The air is directed within the RCA from areas of low potential airborne radioactivity to areas of higher potential airborne radioactivity. 12.3.4 Area Radiation and Airborne Radioac tivity Monitoring Instrumentation 12.3.4.1 Area Radiation Monitoring Instrumentation

a. Objectives and Design Basis

1. Detectors are located in areas that may be normally occupied without restricted access and which may have a potential for radi ation fields in excess of the radiation zone s described in Subsection 12.3.1. 2. The detectors provide on-scale readi ngs of dose rate that include the design maximum dose rate of the radiati on zone in which they are located, as well as the maximum dose rate for anticipated operational occurrences. 3. Each monitor has local visual and audible alarms, with variable setpoint. 4. Indication and annunciation are available in the main control room. 5. The design objectives and location criteria are in conformance with 10 CFR Part 20, Part 70 and Part 50, Appendix A, General Design Criteria 63 and 64, and Regulatory Guides 1.21, 8.2 and 8.8. 6. Post-accident monitoring instrument ation is provided as discussed in Section 7.5.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 18 b. System Description The digital computer-based Radiation Data Management System (RDMS) consists of local microprocessors for each channel, interconnected by a redundant communication loop to a redundant host computer system. Either of the two computers can by itself provide the total computing capacity required for satisfactory operation of the RDMS. The host computer system, in turn, is connected to an operator display/control console in the control room, the health physics control point, the RDMS computer room, the Main Plant Computer System (MPCS) computer room and the hot chemistry lab. The area radiation monitoring system instrument engineering diagram, Figure 12.3-19, shows an overview of the system, its components and location. Table 12.3-14 lists the various area radiation monitoring channels provided and their pertinent design information, such as detector t ype, range, background radiation, safety class, alarm setpoints, referenced drawings for location of area radiation detectors, etc. Class 1E area radiation equipment is supplied from Class 1E uninterruptible power supplies (UPS). Except for the post-LOCA containment monitors and other high-range monitors, each channel is equipped with a radioactive check source which can be actuated from the main control room during test. The post-LOCA monitors and other high-range monitors use an electronic signal to test the circuit. A typical channel is shown in Figure 12.3-19. High radiation levels during refueling at the manipulator crane area in the containment structure initiates isolation of the containment purge and vent system. Those detectors which are designated as non-Class 1E, and are located inside the containment structure are not designed to operate following a major LOCA, and are assumed to be not available to monitor post-LOCA conditions inside Containment. Refer to Subsection 11.5.2 for a discussion of the local micropr ocessor provisions and operating details. 1. Area Monitor Detectors The area monitors employ Geiger-Mueller and ion chamber gamma detectors, as indicated on Table 12.3-14.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 19 2. Class 1E Requirements Separate redundant cabinets are provided in the control room for control, recording and remote indication fo r those monitors in Table 12.3-14 designated as Class 1E. These cabinets and Class 1E area monitors are powered from their respective Class 1E inverters. Class 1E monitors supply their data to the RDMS host computer through an IEEE 279 acceptable isolation device. No information or alarm setting is permitted between the RDMS host computer and the Class 1E equipment. All setpoint changes and check-source insertions are performed locally or from hard-wired modules in the control room. 3. In-Containment High Range Monitoring Redundant Class 1E monitors are provided to monitor containment conditions under accident situati ons. The detector range is 10-10 8 R/hr. The electronics cabinet is located outside Containment in the electrical tunnels. Indication is provided on the RDMS vi deo displays and the RDMS racks in the main control room. These monitors will be designed, located, calibrated and qualified in accordance with Table II.F.1-3 of NUREG-0737. The detectors are located on the steam generator biological shield wall (the "A" detector is near steam generator "D" and th e "B" detector is near steam generator "B") at an approximate elevation of +31'. These locations were selected to provide the detectors as large a view of Containment as possible, consistent with affording ease of access for maintenance and

calibration. 4. Area Monitor Channel Description (a) Containment Manipulator Crane Area Monitor-Channels 6535 A and B Redundant Class 1E detectors are located on the manipulator crane. In the event of a fuel handling accident, these monitors in

conjunction with safeguards actuation signals isolate the containment online and offline purge isolation valves, trip containment air pre-entry, refueling supply and containment online purge fans. Indication and alarm are provided locally and in the main control room.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 20 (b) Personnel Hatch (Post-LOCA) - Channels 6536-1,2 This area monitor is located external to the Containment and is aligned with the personnel hatch. This radiation monitor is intended to monitor ambient ra diation conditions following a LOCA. (c) Containment Post-LOCA - Channels 6576A, B These detectors are intended to monitor conditions inside Containment for Post-LOCA and are Class 1E. (d) Volume Control Tank - Channel 6540 The detector is located inside the volume control tank area.

(e) Cavity Beneath Reactor Vessel - Channel 6529 This radiation monitor is located in the cavity beneath the reactor vessel. The associated components for this monitor are located behind the shield walls which provide protection from the very high ambient radiation in this cavity during reactor operation. (f) High Range Area Monitors - Channels 6508-1,2, 6563-1,2, 6517-1,2 and 6518. There are seven high range ion chamber detectors. In compliance with Regulatory Guide 1.97, these de tectors have an upper range of 10 4 R/hr. These monitors are located in areas which may require entry after an accident or which contain recirculating post-accident fluids. These monitors are: 1) PAB - High Range Area M onitor - Channels 6508-1,2 and 6563-1,2 2) RHR - High Range Area Monitor - Channel 6517-1,2 3) FSB - High Range Area Monitor - Channel 6518 (g) Other Area Radiation Mon itors - Channels 6534, 6537, 6538, 6539, 6541, 6543, 6544, 6545, 6546, 6547, 6549, 6550, 6551, 6552, 6553, 6554, 6555, 6556, 6557, 6558, 6559, 6570, and 6571 These channels use Geiger-Mueller detectors and monitor the ambient radiation at various points throughout the facility as listed

in Table 12.3-14.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 21 5. Calibration and Maintenance Refer to Subsection 11.5.2.6 for calibration and maintenance details. 12.3.4.2 Airborne Radioactivity Mo nitoring Instrumentation

a. Objectives and Design Basis The ventilation airborne Radioactivity Monitoring System provides radiation measurements, indications, records, alarms and controls at selected locations to detect and control radiation levels within Containment, Service Building, Radwaste Building and the plant vent, and to verify compliance with applicable limits of 10 CFR 20 and 10 CFR 50, Ge neral Design Criteria 19, 63 and 64. On May 21, 1991, a complete revision to 10 CFR 20 was issued. Several design bases reference 10 CFR 20 and specific terms or parts of 10 CFR 20. Design bases information provides a historical perspective of the information used to formulate a particular design. References to 10 CFR 20 when used in a historical or design bases context have not been changed to reflect the revised 10 CFR 20. Monitored points within the station ventilation system are in areas where potential personnel exposure to radiation is most lik ely and in several ventilation exhaust ducts. A tabulation of the airborne Ra diation Monitoring System is found in Table 12.3-15, Table 12.3-16 and Figure 12.3-20. Those monitors which are Class 1E are listed in the above tables and further discussed in Subsection 12.3.4.1b.2. The sensitivity of the airborne radioactivity monitors is such that they should be capable of detecting ten MPC-hours of pa rticulate and gaseous radioactivity in those plant areas that have contained sour ces of airborne radioactivity and which may be occupied by personnel. Typical ai rborne concentrations for various plant areas are given in Table 12.2-31, Ta ble 12.2-32, Table 12.2-33, Table 12.2-34, Table 12.2-35, Table 12.2-36, and Table 12.2-37. As discussed in Subsection 12.5.3.1, the Health Physics Program includes requirements to perform sampling and analysis for airborne radioactivity, routinely and during specific evolutions such as opening of the primary system. Sampling equipment includes portable continuous air monitors and portable samplers. The monitoring and sampling capabilities, when combined, provide sufficient information to permit adequate protection of personnel from exposure to airborne radioactivity.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 22 b. System Description Subsection 12.3.4.1b describes the digital computer based RDMS. Subsection 11.5.2 describes the local microprocessor prov isions. The airborne Radioactivity Monitoring System consists of two basic types of monitoring systems: Particulate and gaseous monitors (with iodine sampling) which are skid-mounted and utilize pumping systems. Gross activity monitors which consist of detectors mounted directly in duct air stream. A typical channel is shown in Figure 12.3-20. 1. Particulate and Gaseous Monitors Each airborne particulate and gaseous monitor has common equipment as follows: (a) Isokinetic Sampler Sampler and lines adhere to requirements of ANSI N13.1. Sample line sizes are one-half inch with flow rate designed for 2-3 scfm. All sample lines slope from high point (isokinetic sampler) to the low point (sample pump). (b) Pumping System (1) The flow control assembly includes a pump unit and selector valves that provide a representative sample (or a "fresh" sample) to the detector. (2) The pump unit consists of: a A pump to obtain the air sample b A flowmeter to indicate the flow rate c A flow control valve to provide flow adjustment d A flow alarm assembly to provide low and high flow alarm signals. (3) Selector valves are used to direct the desired sample to the detector for monitoring and to block flow when the channel is in the maintenance or "purging" condition. (4) Purging is accomplished with a valve control arrangement whereby the normal sample flow is blocked and the detector purged with a "fresh" sample.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 23 (5) A sample flow rate indicator is calibrated linearly from 0 to 4 scfm. (6) Indicator lights are actuated by the following: a Flow alarm assembly (low or high flow), b The filter paper sensor (paper drive malfunction), or c The pump power control switch (pump motor on). (c) Detectors The particulate channel air sample is drawn in a closed system monitored by a scintillation counter-filter paper detector assembly. The filter paper collects 99 percent of all particulate matter greater than 0.3 micron in size on its continuously moving surface, and is viewed by a photomultiplier-scintillation crystal combination. The air sample is returned after it passes through the series-connected iodine filter and gas monitors. The detector is a hermetically sealed scintillator crystal combination. The pulse signal is transmitted to the radiation monitoring system local cabinet. Lead shielding reduces the bac kground radiation level to prevent interference with the sensitivity of the detector. The filter paper mechanism, and electro-mechanical assembly which controls the filter paper movement, is provided as an integral part of the

detector unit. The unit contains an approximate 25-day filter paper supply at normal speed. The particulate filter is follo wed by a cartridge-type charcoal iodine filter. The iodine filter is a charcoal filter which will meet certain specifications for iodine removal. The particulate and iodine filters are suitable for laboratory analysis. The removal of all particles greater than 0.3 microns eliminates the need for maintaining isokinetic conditions downstream of the particulate and iodine filters. The iodine filter is not monitored continuously. The iodine filter is periodically removed and analyzed as appropriate.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 24 Next, the gaseous channel views the air sample. The sample is constantly mixed in the fixed, shielded volume, where it is viewed by a beta scintillator. The sample is then returned to its environment. The detector assembly is in a completely enclosed housing containing a beta scintillator mounted in a constant gas volume container. Lead shielding reduces the background radiation level to prevent interference with the detector's sensitivity. 2. Particulate and Gaseous Monitor Channel Descriptions (a) Containment Monitor - Channel 6526 and 6548 Monitor 6526 draws a containment air sample through redundant pumps from the containment atmosphere. The sample is then returned to the containment atmosphere. Monitor 6548 is located inside Containment at zero foot elevation and acts as a backup to monito r 6526. Monitor 6548 draws air sample from the Containment via the sample pump and then discharges back to the Containment. These monitors are classified seismic Category I. Indication and alarm is available locally and in the main control room. See Subsections 5.2.5.3b.2, 5.2.5.5b and 5.2.5.5c for a further discussion of monitoring requirements. (b) Waste Process Building Monitor - Channel 6531 The major potential release of airborne radioactivity in the Waste Processing Building is that associated with the Gaseous Waste Processing System. The gas drye rs, carbon delay beds and the two gas compressors are situated in their individual compartments, and these compartments are ventilated in such a way that they are at a negative pressure with respect to surrounding areas. The ducted ventilation exhaust is continuously sampled and monitored. The sample is returned to the ducted ventilation exhaust line which is directed to the plant vent. Both the sampling point and the return are downstream of the f ilters in the ventilation exhaust line outside the building. Information from this channel is displayed and alarmed on the radiation monitoring system panel in the main control room and locally.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 25 (c) Primary Auxiliary Building Monitor - Channel 6532 Three minimum ventilation areas have been defined for the Primary Auxiliary Building:

(1) Heat exchanger, thermal regeneration demineralizer, and mixed bed demineralizer area (2) Volume control tank area (3) Charging pump area. These areas, which are potential sources of airborne activity, are maintained at a negative pressure with respect to surrounding areas. The PAB ventilation system collects potentially contaminated air through a duct system and discharges it to the plant vent via filter train F-16. The sample withdrawal point for this monitor (RM-6532) is downstream of filter train F-16. The location of this sample withdrawal point provides an early warning to the operating personnel in the event that radioactive material becomes airborne in the PAB. Indication and alarm is available locally and in the main control room. An alarm indication on these monitors would trigger a radiological evaluation within the areas served by these monitored ventilation lines. The evaluation would be performed by station HP personnel using portable survey and/or air sampling equipment, as necessary, to locate the source of the elevated

ventilation line indication. (d) Administration and Servi ce Building Monitor-Channel 6522 The Service Building, which houses the RCA shop, counting room, hot chemistry lab, decontamination facility, RCA showers and health physics control point, is a potential minor source of airborne contamination. This building has its own ventilation system which exhausts to the atmosphere through a single run of ventilation ducting. A continuous air sample is removed from the ducting downstream of the filters and monitored for particulate and

gaseous activity. The sample is re turned to the ventilation exhaust lines, again, downstream of the filters. The channel is displayed on the radiation monitoring system panel in the main control room.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 26 (e) Plant Vent Monitors - Ch annels 6528-1, 6528-2, 6528-3, and 6495 These detectors monitor the air exhausted by the Primary Auxiliary Building, Waste Process Buildi ng, Fuel Storage Building, containment structure and containment enclosure via the plant vent. An isokinetic probe, supplem ented with an integral pumping system is used to withdraw an air sample from the plant vent. The

air quantities exhausted via th e plant vent are indicated on Figure 9.4-5, Figure 9.4-6, Figure 9.4-7, Figure 9.4-8, Figure 9.4-9, and Figure 9.4-10. Multisensor flow transmitters and microprocessor provide a signal to the radiation monitor (RM-6528) to permit this monitor to calculate the microcuries per cubic centimeter flowing in the duct, microcuries per second and the integrated microcuries released through the plant vent. The air collected by the isokinetic probe passes through the wide-range gas monitor, WRGM, (RE-6528-1, RE-6528-2, and RE-6528-3). Sampling provisions are located downstream of the isokinetic nozzle. The air flow enters the sample conditioning skid of monitor RM-6528 at a flow rate of 0.06 cfm during postulated accident conditions. This skid is intended to provide representative particulate and radioiodine sample s for laboratory analysis (for normal operation as well as accid ent conditions) and to prevent contamination of the gas monitors. A multiple filter arrangement is provided to allow sampling capabilities for the duration of the measurement period. Each fi lter is equipped with a 4 solid lead shielding and quick disconnect fittings to minimize personnel exposures. In addition, all functional control is performed remotely. The wide-range gas monitor has the capability of detecting a wide range of radiogas concentrations over 12 decades. The monitor meets the requirements of NUREG-0737, item II.F.1 by providing an upper range of 10 5 Ci/cc for noble gases and the capability to collect post-accident plant vent grab samples. A seven-day composite grab sampling system for normal operation is also

provided for particulates and iodine determination. Indication and alarm from the WRGM are available locally and in the main control room.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 27 A portable pump with detector (RE-6495) provides backup to the WRGM mid and high range.

Indication and recording are provided in the Technica l Support Center (TSC). 3. Gross Activity Monitors These units do not utilize a pumping system. The detectors are located directly in the duct air stream. These monitors employ Geiger-Mueller type detectors. The local microproc essor cabinet provisions are described in Subsection 12.3.4.1b. 4. Gross Activity Monitor Channel Descriptions (a) Administration and Service Building Fume Hoods Monitor -Channels 6523, 6524 and 6525 These detectors are Geiger-Muell er counters and are located in each of the chemistry fume hoods. They measure the gross activity of air exhausted from the shop fume hoods to atmosphere. Local alarm and indication are available near the fume hoods. No control function is provided. These monitors provide data to the RDMS host computer for alarm, display and documentation. Remote indication and alarm are available in the main control room. (b) Fuel Storage Building Exhaust Monitor - Channel 6562 This detector is a Geiger-Mueller counter and is located in the fuel storage building ventilation exhaust duct downstream of the fans. This detector measures the gross activity vented from the Fuel

Storage Building to the plant vent. Indication and alarm is available locally in the Fuel Storage Building near the spent fuel storage pool, and remotely in the main control room. (c) Containment Enclosure Emergency Exhaust Monitor -

Channel 6566 This detector is a Geiger-M ueller counter and is located downstream of the containment enclosure emergency exhaust filter

fans and measures the gross activity exhausted to the plant vent stacks. Indication and alarm are available locally near the filter fans and remotely in the main control room.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 28 (d) Primary Auxiliary Building, Miscellaneous Ventilation Exhaust -

Channel 6567 This detector is a Geiger-Mueller counter and is located at the inlet to the primary auxiliary building cleanup filter. The following areas are monitored by this detector: valve aisle, volume control tank area, sample heat exchanger room, sample room fume hood, degasifier area, PAB lower level elevation (-)6', and PAB filter and heat exchanger area. Indication and alarm are available locally near the cleanup filter, and remotely in the main control room. (e) Containment Enclosure Monitor - Channel 6568 This detector is a Geiger-Mueller counter and is located in the exhaust duct from the containment enclosure at the inlet to the cleanup filter. The detector monitors the gross activity exhausted from the containment enclosure. Indication and alarm are

available locally near the cleanup filter, and remotely in the control room. (f) Control Room Air Intake Monitors - Channels 6506A and B, 6507A and B Four detectors are located in th e east air intake piping and four detectors are located in the west ai r intake piping. These detectors are located in the Control a nd Diesel Building. These GM detectors, which are Class 1E, monitor the control room air intake and automatically shut down, on a high radiation signal, the control room ventilation fans and isolation dampers. Each monitor utilizes a two-out-of-two detector logic such that two detectors must be in alarm before the monitor initiate s an isolation signal. These detectors are directly mounted in the air intake stream and do not require shielding. Indication and alarm are provided locally. Indication, recording and alarm are provided in the main control room. (g) Containment Online Purge Monitor - Channels 6527A, 6527B For a description of this monitor see Subsection 11.5.2.1.

S EABROOK STATION UFSAR R ADIATION PROTECTION Radiation Protection Design Features Revision 10 Section 12.3 Page 29 5. Portable Continuous Air Monitors (CAM)

Four portable continuous air monitors are available. The CAMs are equipped to monitor particulate and noble gas. The normal locations for the CAMs are as follows: Waste Process Building Primary Auxiliary Building Fuel Storage Building Containment (on the operating floor during refueling outages) Control Building (during normal operations) CAMs may be moved to other station locations as radiological conditions dictate. 6. Calibration and Maintenance Refer to Subsection 11.5.2.6 for calibration and maintenance details. 12.3.4.3 Post-Accident In-Plant Iodine Assessment The capability exists for the determination of airborne radioi odine levels in-plant under accident conditions. This capability includes the use of air samplers with radioiodine-specific sample cartridges and the use of gamma spectroscopy instrumentation for sample analysis. Information on portable air sampling and counting room equipment is discussed in Subsection 12.5.2. This sampling and analysis is described in station procedures in which station personnel are trained. Training includes the proper handling and preparation of high-level radioactive samples and the operation and calibration of gamma ray spectroscopy equipment for post-accident sampling in addition to normal sampling techniques.

SEABROOK STATION UFSAR R ADIATION PROTECTION Dose Assessment Revision 10 Section 12.4 Page 1 12.4 DOSE ASSESSMENT 12.4.1 Criteria and Objectives Seabrook Station and its operationa l procedures are designed to en sure that radiation exposures to the station's operating and maintenance personnel during normal opera tions and anticipated operational occurrences are within the limits speci fied in 10 CFR 20 and as low as reasonably achievable (ALARA). Regulatory Guide 8.19 was not available until after th e plant was already past the early stages of construction; however, in all pha ses of the design and construction of the plant, careful consideration has been given to eliminating unnecessary exposures and, wherever practical, minimizing the exposures of station personnel.

The radiation exposures to st ation personnel presented in Subsection 12.4.2 are pre-operation estimates based on PWR operating experience in the 1970s and Seabrook Station's design features. The occupational radiation exposures in Light Water Reactors have since been reduced significantly. The estimated man-rems presen ted in Tables 12.4-1 through 12.4-7 are largely independent of the fine variati on of the reactor power. For an operating nuclear power station, the actual occupational exposures are carefully recorded and reported. Following operation at the licensed core power level, th e occupational exposures are expected to increase approximately in proportion to th e reactor power. The estimated annual direct and scattered doses at the Site Boundary presented in Subsection 12.4.3 were calculated conservatively and remain valid following operation at the licensed core power level. 12.4.2 Occupational Radiation Exposures In general, several factors have been found which effect personnel exposures. These factors are: a. The number of years a plant has oper ated. PWR exposures tend to show large increases during the first few years of opera tion, but tend to level out after several years b. Plant design and equipment layout

c. The extent that maintenance is required in a specific year d. The amount of corrosion products, fission products and activation material deposited on or circulating through various parts of the plant systems e. Training and experience of workers

f. The extent of direct supervisi on inside the radiation control area

g. The extent that a utility uses unfamiliar or contractor personnel h. Extended operation with failed fuel SEABROOK STATION UFSAR R ADIATION PROTECTION Dose Assessment Revision 10 Section 12.4 Page 2 i. The integrity of the primary fluid systems. Radiation exposures in the station are primarily due to direct and s cattered radiation from components and equipment containing radioactive fluids. In some plant radiation areas, personnel can also be exposed to airborne radionuclides. Figure 12.3-1, Figure 12.3-2, Figure 12.3-3, Figure 12.3-4, Figure 12.3-5, Figure 12.3-6, Figure 12.3-7, Figure 12.3-8, Figure 12.3-9, Figure 12.3-10, Figure 12.3-11, Figure 12.3-12, Figure 12.3-13, Figure 12.3-14, Figure 12.3-15, Figure 12.3-16 and Figure 12.3-17 identify the locations of the major sources of radioactivity and the classifications of the various radiation zones in the plant. In Zone I areas, such as offices and control rooms, the maximum dose rate does not exceed 0.5 mrem/hour. Occupancy in Zones II through V is limited by administrative controls to ensure that personnel do not receive doses in excess of the 10 CFR 20 limits. (See Table 12.3-1 for estimated occupancies of radiation zones by work function.) 12.4.2.1 Operating PWR Data Reports summarizing the occupational radiation e xposures at operating nuc lear power stations (References 1-5) have provided im portant input data for the design of Seabrook Station. To cite specific examples, the operational exposure data indicate that steam generator maintenance and in-service inspection are key high exposure activities (Reference 1).

An average of 27 percent of the total annual exposures at PW Rs can be attributed to steam generator work. In-service inspection is the next most signi ficant activity, causing an aver age of 5.6 percent of the total annual exposures.

Operating data given in the above references has helped to identify the most significant dose-causing activities, and to establish the priorities for ALARA-rela ted design reviews and improvements. 12.4.2.2 Direct Radiation Dose Estimates Average annual doses within Seabrook Unit 1 were estimated by comparing the plant's design features with the appropriate historical exposure data from operat ing plants. Expected radiation fields and exposure times were projected for all ma jor activities within the plant. The estimated dose rates and exposure times for each task were multiplied to obtain an estimate of the occupational radiation exposure for each task or activity, and summed to obtain the expected annual dose for the unit. The estimated annual occupational radiation exposure is expected to be approximately 372 man-rem. Table 12.4-1 summarizes the exposures by major task; Table 12.4-2, Table 12.4-3, Table 12.4-4, Table 12.4-5, Table 12.4-6 and Table 12.4-7 provide the detailed dose and exposure time estimates by major task.

SEABROOK STATION UFSAR R ADIATION PROTECTION Dose Assessment Revision 10 Section 12.4 Page 3 12.4.2.3 Inhalation Exposure The annual man-rem dose from airborne activity in the Seabrook plant will be very small compared with the annual man-rem doses due to direct and scatte red radiation. Potential sources of airborne radioactivity (Subsection 12.2.2) have been analyzed and reduced to levels that are considered as low as reasonably achieva ble for both occupati onal and nonoccupational exposures. As a result of operational occurrences and maintenance activities, personnel are required to enter areas where airborne radioactivity exists, or is expected. In such cases, the airborne concentrations are monitored by health physics personnel. The necessary protective devices (respiratory protective devices, protective clothing, etc.) and, if appropriate, control devices (portable ventilation, containment, etc.) are specified according to the concentration(s) and radionuclide(s) present. The re spiratory protective devices ar e used in conjunction with administrative controls (Section 12.5) to limit occupancy times for personnel working in a contaminated atmosphere. Records of the inha lation exposures accrued by plant personnel are maintained. In summary, inhalation doses to personnel are limited by: a. Maintaining positive control to ventilation air in contaminated work areas b. Health physics survey of work areas to identify the radionuclide concentrations present in personnel work areas. c. Controlling the occupancy time in areas with airborne contamination, and, when necessary, requiring personnel to use respir atory protective devi ces and protective clothing d. Actions taken in response to posi tive whole body or bioassay results. The measures described above minimize exposures to airborne radioactivity and ensure that the doses to individual employees from airborne radioactivity are small fract ions of the 10 CFR 20 limits for occupational workers, and that annual man-rem doses comply with the ALARA criteria. Periodic whole body c ounts and special bioassays, as described in Subsection 12.5.3.5, are conducted to monitor personnel internal exposure and to eval uate the effectiveness of the program. 12.4.2.4 Exposure Reduction Methodology Plant design features which ar e applicable to the Occupati onal Radiation Exposure (ORE) - ALARA program are enumerated in Subsection 12.3.1.

The plant layout is designed so that passage through a high radiation area to obtain access to a lower radiation area is avoided.

SEABROOK STATION UFSAR R ADIATION PROTECTION Dose Assessment Revision 10 Section 12.4 Page 4 Wherever practicable, component s are shielded individually to keep exposures ALARA during maintenance and inspection activities. The reactor cavity is specially shielded to reduce neutron dose rates at the operating floor. Auxiliary control boards are located with ALARA concepts in mind, and shielded pipe chases are used extensively in order to segregate radioactive piping from normally occupied areas. The plant's ventilation system (Section 9.4) is designed to maintain the concentration of airborne radioactivity in occupied areas well below the occupational concentration values specified in 10 CFR 20, Appendix B, Table 1, Column 3.

The airborne radioactivity monitoring instrumentation (Subsection 12.3.4) provides radiation measurements, alarms, and controls at selected locations in areas where the potential exposures are most likely.

To further reduce exposures, Seabrook Station uses redesigned steam ge nerators that need considerably less maintenance. Improvements in secondary system water chemistry and tube support plates have reduced the likelihood of the need to plug tubes. Also, the volatile chemical treatment employed for the secondary system alleviates the need for sludge lancing of the secondary side.

Steam generator cladding and tube inspections will be performed wherever possible with remotely operated equipment, and the mechanical tube plugging technique will be used when feasible. This process has proved successful in reducing the doses from this task by more than a factor of two compared to the manual welding method. Seabrook Station has incorporated a simplified reactor vessel head assembly (SHA) into the plant design to reduce personnel exposure and outage time related to reactor vessel head removal and reinstallation.

The SHA is a modification to the reactor vessel head assembly which replaces the existing missile shield, eliminates the CRDM ductwork simplifies the control rod drive mechanism and control rod drive rod position indi cation cable configurations, and allows the reactor vessel head lift rig to remain permanently m ounted on the reactor vessel head. Installation of the SHA is estimated to save 3 person-rem each refueling outage by eliminating missile shield/ventilation duct removal and installation. Th ese changes are reflected in the updated dose estimate shown in Table 12.4-4. Table 12.4-4 also has been updated to eliminate disconnecting/reconnecting reactor head instrument port thermocouples. Reactor head instrument port thermocouples are not employed in the Seabrook design.

This results in an additional reduction of 4 person-rem from the refueling operations dose estimate shown in Table 12.4-4.

The summary in Table 12.4-1 has also been updated to reflect these changes.

SEABROOK STATION UFSAR R ADIATION PROTECTION Dose Assessment Revision 10 Section 12.4 Page 5 12.4.3 Estimated Annual Dose at the Site Boundary and to the Populationat Large 12.4.3.1 Direct And Scattered Radiation Dose Estimate For normal plant operations, the maximum direct and scattered dose rate external to the reactor, the Primary Auxiliary Building, and the Waste Processing Building is less than 0.5 mrem/hour by design. The shielding design is based on a conservative assump tion of a 1 percent failed fuel fission product source term. Actual levels are expected to be significantly less than the 0.5 mrem/hour design value. A level of 0.5 mrem/hour at the outside surface of the Primary Auxiliary Building would result in a dose rate of less than 0.05 mrem/year at the exclusion area

boundary.

The principal sources of radioactivity not stored in plant structures are the radioactive liquids stored in the reactor makeup water storage tanks and the refueling water storage tanks that are located in the Tank Farm. The location of the Tank Farm is shown on Figure 1.2-1. The maximum expected radionuclide inventories in each of these tanks is provided in Table 12.2-21 and Table 12.2-22. The total direct radiation dose rate at the exclusion area boundary from all four of these tanks with the maximum radionuclide inventories is calculated to be less than 5 mrem/year. 12.4.3.2 Doses Due to Liquid And Gaseous Releases Estimates of the doses at the site boundary and beyond from stat ion liquid and gaseous releases are provided in Subsecti ons 11.2.3 and 11.3.3, respectively.

12.4.4 References

1. "Compilation and Analysis of Data On Occupational Radiation Exposure Experienced at Operating Nuclear Power Plants," Atomic Industrial Forum, Inc., National Environmen tal Studies Project, September 1974. 2. "Occupational Radiation Exposure at Light Water Cooled Power Reactors 1969-1974," NUREG-75/032, June 1975. 3. "Occupational Radiation Exposures at Light Water Cooled Power Reactors 1976," NUREG-0323, March 1978. 4. "Occupational Radiation Exposure, Tenth Annual Report, 1977," NUREG-0463, October 1978. 5. "Occupational Radiation Exposure at Commercial Nuclear Power Reactors 1978," NUREG-0594, November 1979. 6. "Technology Planning Study of Occupa tional Radiation Exposure in LWR Nuclear Power Plants," Electric Power Research Institute, January 22, 1980.

SEABROOK STATION UFSAR R ADIATION PROTECTION Dose Assessment Revision 10 Section 12.4 Page 6 7. "Radiation Exposure Management - The Westinghouse ALARA Program," J. D. Cohen and J. R. Ma gaw, presented at the International Radiation Protection Conference, Paris, December 1979. 8. "Study of the Effects of Reduced Occupational Radiation Exposure Limits on the Commercial Nuclear Power Indus try," (to be published) prepared for Atomic ndustrial Forum, Inc. by Catalytic, Inc., (1979-1980).

S EABROOK STATION UFSAR R ADIATION PROTECTION Health Physics Program Revision 12 Section 12.5 Page 1 12.5 HEALTH PHYSICS PROGRAM The health physics functions are organized and equipped to protect plant employees from unnecessary exposure to radiation and radioactive materials. 12.5.1 Organization The Seabrook Station staff and the orga nization are discusse d in Section 13.1.

The health physics organization is responsible for the overall implementation of the operational health physics program. The health physics orga nization has the responsibility and authority to report to the Station Director on any aspect of the radiation protection program, or its implementation, as deemed necessary. The health physics organization is responsible for ensuring station compliance with the applicable fe deral and state radiatio n protection regulations. The health physics department manager and personnel selected for temporary replacement of the health physics department manager shall meet ANSI/ANS 3.1-1981, or equivalent.

The health physics support staff may include supe rvisory personnel, health physicists and other personnel to assist with implementing the radiation protection program. The supervisors are responsible for directing the activities of the h ealth physics technicians.

Personnel assigned as health physics supervisors will meet the minimum qualification requirements specified in ANSI 3.1-1978, Paragraph 4.3.2.

The health physicists provide administrative and technical assistance to the health physics supervisors. Their principal responsibilities include providing program level guidance in such technical areas as internal/external dosimetry, radiation detection/measurement and dose reduction (i.e., ALARA). Minimum qualifications are as specified in ANSI 3.1-1978.

Health physics technicians are responsible for performing the routine and daily operations of the department. Technicians will meet at least the minimum qualifications applicable to their work, as specified in ANSI 3.1-1978, Paragraph 4.5.2, in order to fulfill the operating shift crew function in Subsection 13.1.2.3, and any other qualifications set by management to ensure that the technicians are capable of performing assigned work duties. These duties include performing various surveys, collecting air samples, maintaining department equipment and instrumentation and providing radiation protection/control coverage, as necessary, during station operations and maintenance activities.

Assistant health physics technicians may be employed to assist in department activities. These assistant health physics technicians would have as a minimum a high school degree. Their duties may include assisting the technicians in the performance of surveys, sampling, radiation protection, dosimetry, whole body counting, and maintaining department equipment. The assistant technicians participate in the health physics technician qualification program, and when an individual has three years experience, or otherwise meets the te chnician qualification requirements, he is eligible for the technician position.

S EABROOK STATION UFSAR R ADIATION PROTECTION Health Physics Program Revision 12 Section 12.5 Page 2 Section 13.2 contains information on training that will be given to the Health Physics department. In addition to the formal training provided by the training department, the health physics staff will provide additional specialized instruction to their department technicians. 12.5.2 Equipment, Instrumentation and Facilities The selection criteria for equipment and instrumentation presented can be met by several manufacturers. Equipment is purchased from manufacturers that can supply suitable equipment and instrumentation, provide repair services when required, and provide replacement parts without undue delay. Facility design and equipment are selected to facilita te dose reduction.

The facilities are designed with adequate working spaces and for ease of access from working locations. Decontamination facilities are located at the Fuel Storage Building, Waste Processing Building, and in the Administration and Services Building. 12.5.2.1 Counting Room Equipment The instrumentation in the counting rooms is used for determining airborne radionuclide concentrations, removable contamination, and ra dionuclide concentrations in liquid samples. Two counting rooms house laboratory radiation detection equipment, one for health physics support and the other for chemistry support. The health physics count room is equipped with alpha, beta and gamma detection equipment to analyze routine air samples and contamination survey smears. The health physics counting equipment is supplemented by the chemistry counting room when additional analytical capabi lities in a low background area are required. The gamma detection equipment includes germanium detectors coupled to gamma spectroscopy equipment. This gamma detection capability is available in both the chemistry and health physics counting rooms. This equipment will be capable of detecting, as a minimum, alpha, beta and gamma activity (as specified above). This counting room equipment is used primarily for quantitative and qualitative analysis of liquid, smear, and air samples.

Criteria for equipment selection are numerous and include accuracy, stability under various atmospheric conditions, sensitivity, and compatibility with many types of peripherals.

Calibration and operational equipment checks are performed and documented on a routine basis.

Radiation background and detec tion performance factors are normally checked prior to equipment use each day. Calibr ation of equipment is performed by the appropriate department technicians periodically and will include an efficiency check, operational checks, and (when applicable) a plateau check. All equipment is recalibrated upon completion of major maintenance.

S EABROOK STATION UFSAR R ADIATION PROTECTION Health Physics Program Revision 12 Section 12.5 Page 3 12.5.2.2 Portable Instruments for Measuring Radiation The portable instrumentation consists of low- and high- range ion chamber dose rate meters, Geiger-Mueller count rate meters, scintillation or proportional alpha c ounters, neutron rate meters, and air samplers. The selection of instrumentation has been partially based on equipment suitability for use during emergencies, because emergency conditions require a wide range of equipment capable of withstanding extreme usage conditions.

Criteria considered for equipm ent selection include linearit y of response at different temperatures and humidities, reliability of response, accuracy, geometric and energy dependence, stability, and dependability. Other desirable criteria include vers atility, ease of obtaining spare parts on a timely basis, sturdiness, compactness, weight, and ease of operation. Sufficient quantities of each type of instrument are available to permit calibration, preventative and corrective maintenance, and handling of peak work loads without diminishing the radiation protection program. The types, quantities, and other information about instrumentation are presented in Table 12.5-1.

Most instruments are normally stored at the main health physics control station where they are easily accessible. Extra equipmen t not intended for daily use is stored in other health physics storage areas. Instruments may also be stored at temporary control points to make them more accessible from some work areas.

Calibration of portable survey instrumentation in use will be conducted on a semiannual basis or as necessary due to maintenance, questionable accuracy, or possible damage. Prior to use, an operational check will be performed which will include a battery check and a source check. Calibration techniques of air samplers will vary according to type. The air samplers will be calibrated semi-annually, after maintenance that may affect operation, and when accuracy is questionable. The calibration procedure for the low volume, high volume, and personnel air samplers consists of determining the actual flow rate. Continuous air monitor (C.A.M.)

calibration procedures are dependent upon type c hosen, but generally consist of flow rate adjustments, source checking of detectors, and checking filter paper speed and adjustment, if necessary. 12.5.2.3 Personnel Monitoring Instruments The instruments used for detecting personnel contamination and exposure, listed in Table 12.5-2, are state-of-the-art when practicable. The official and permanent records of accumulated external and internal radiation exposure will be generated from data acquired by this instrumentation.

S EABROOK STATION UFSAR R ADIATION PROTECTION Health Physics Program Revision 12 Section 12.5 Page 4 Two types of friskers (personnel external contamination m onitors) are used throughout the station. The first type of frisker is a portal monitor or similar large area detection device and the second type is of the portable hand held probe design. These friskers are designed for routine use by all personnel that exit the station or Radi ologically Controlled Area (RCA). Criteria for frisker selection include ease of use, sensitivity to small amounts of radioactive materials, and the ability to locate contamination on the body.

Frisker locations throughout the pl ant are dependent upon projected and actual personnel traffic. At least one portal monitor and one hand-held probe-type frisker are located at the facility access building during normal conditions. The number of friskers and por tal monitors at the facility access point may be increased during peak personnel traffic. Personnel external contamination devices are located at the RCA entrance-exit and other locations as necessary to control contamination. Other locations may include, but are not limited to: Waste Processing Building Spent Fuel Storage Building Primary Auxiliary Building RCA machine shop Radio-chemistry laboratory Containment personnel hatch Calibration of hand-held probe-type friskers is performed at semiannual intervals, when damage may have occurred, accuracy or reliability is questionable, and when maintenance is performed that could affect operation. Ca libration procedures in clude source response checks, sensitivity correction, and alarm operability. Instrumentation for determining individual exposure from external sources, such as self-reading pocket dosimeters (SRPDs) or electronic dosimeters are available on site and controlled by the health physics department. Electronic Dosimeters (EDs) are the primary means of monitoring incremental exposures to individuals. SRPDs will be used as a backup. The SRPDs are of various ranges: predominately 0 to 200 mR for general use, with 0 to 1000 mR and 0 to 5000 mR for use during specific high-exposure tasks or emergency conditions.

SRPD selection is based primarily upon results of drift test, accuracy test, drop test, and usable lifetime as determined by those in use at other facilities. Dosimeters ar e issued by health physics personnel and stored near the Radiologically Controlled Area control point. Calibration of SRPDs is performed every six months or prior to putting the dosimeters into use. The calibration procedure provides criteria for acceptance of both the source and drift tests which are performed as calibration checks. Calibration of SRPDS will be performed prior to placing them in service.

S EABROOK STATION UFSAR R ADIATION PROTECTION Health Physics Program Revision 12 Section 12.5 Page 5 The official and permanent record of accumulated external radiation exposure received by individuals is obtained principally from the reading of thermo-luminescence dosimeters (TLD).

These dosimetry devices are capable of measuring beta, gamma, and neutron radiations in mixed radiation fields in accordance with industry standards. Dosimetry devices are issued to radiation workers after completion of check-in requiremen ts at the station. Criteria for issuance are outlined by procedures developed by the Health Physics Department. TLD badges and

processing services are provided by a Nationa l Voluntary Laboratory Accreditation Program (NVLAP) accredited laboratory. The TLDs are processed at a frequency not exceeding the period for which dose limits are listed in 10 CFR 20 for occupational exposure. Any offici al dosimetry device us ed at Seabrook Station requiring processing is supplied and evaluated by a laboratory accredited through the National Voluntary Laboratory Accreditation Program.

Selection criteria for the whole body counter consist of quantitative accuracy, qualitative accuracy, and the ability to determine low body or organ burdens of common PWR gamma emitting radionuclides.

The whole body counter is located onsite in a low background area. Calibration of the whole body counter will be performed or verified annually, when major maintenance is performed, and when results appear to be incorrect in accordance with health physics procedures. Operational checks are performed prior to daily use and include a background count, quality control sample measurement and software verification. An in-vitro bioassay program has been establishe

d. A vendor laboratory having the capability of analyzing urine and fecal samples for body burdens of common PWR ra dionuclides, including tritium is used. The health physics organization verifies that the vendor's quality assurance program assures accurate analysis. The program is used for accidents, incidents, and suspected uptakes of radionuclides not detectable by whole body counting equipment. 12.5.2.4 Personnel Protective Clothing Protective clothing is provided fo r employees required to work in areas where this clothing is necessary. The protective clothi ng is kept at the RCA change area and, when required, at the location of work. The quantity of protective clothing that is maintained for use is calculated considering normal usage, quantity in the laundry process, and anticipated work. Examples of the types of protective clothing that may be available are as follows: Coveralls Lab coats Plastic suits Surgeon caps or similar head covers Cloth hoods S EABROOK STATION UFSAR R ADIATION PROTECTION Health Physics Program Revision 12 Section 12.5 Page 6 Plastic shoe covers, low and high Rubber boots Rubber shoe covers Cotton gloves Rubber gloves Goggles Face shields Welding shields 12.5.2.5 Respiratory Protection Equipment A respiratory protection program has been esta blished and procedures written to reasonably ensure that personnel exposure to radionuclide concentrations do not exceed the exposure limits for internal dose as specified in 10 CFR 20.

The protection factors assigned to respiratory equipment are those specified in Appendix A of 10 CFR 20. The equipment consists of facepiece-fitting instrumentation, full-face respirators, self-contained breathing apparatus (SCBA), airfed hoods, airlines, filter canisters and cartridges, communication devices, eyeglass adapters, welding equipment plus maintenance and repair supplies.

New respirators are checked prior to initial use by a visual inspection. Used respirators are cleaned, disinfected, checked for contamination and mechanically inspected prior to reissue. Emergency respirator equipment is checked each month and an inspection log is maintained.

Respirators and associated accessories are maintained and controlled by health physics. A health physics-controlled storage area is used to store new or infrequently used respiratory equipment. The RCA access area contains the equipment that may be used on a daily basis. Each respirator not equipped with its own storage case is placed in a bag to maintain cleanliness and stored to protect it from damage. Emergency respirator s are located throughout th e facility for rapid accessibility. 12.5.2.6 Health Physics Support Facilities An instrument calibration facility has been established for the calibra tion of portable health physics instruments. The facility is equipped with the items necessary for instrument calibration and repair. Personnel decontamination equipment and show ers are located near the Radiologically Controlled Area Control Point. Soap, chemicals, brushes, and other materials necessary for personnel decontamination are available at this location. Instrumentation capable of detecting external contamination is also available near the RCA shower area.

S EABROOK STATION UFSAR R ADIATION PROTECTION Health Physics Program Revision 12 Section 12.5 Page 7 A facility for the decontamination and cleaning of monitoring instruments and small tools is provided. The decontamination facility contains the necessary chemicals, cleaning agents, and utensils to meet the majority of small tool and instrument decontamination needs. A respiratory equipment cleaning, sanitizing and re pair facility is provided. Located at the facility are equipment and chemicals needed to check, clean, sanitize and repair all reusable respirators and respiratory equipment. Two separate clothing change facilities (men and women) are available for preparing for use of anti-contamination clothing and are located near the health physics control point.

The health physics control point is used for instrumentation storage, as the primary access point, radiological data information center, and health physics operations. Figures showing the location of the health physics control point and other areas discussed in this subsection are included as part of Section 1.2.

In order to support increased Radiologically Controlled Area access/egress requirements, such as those normally experienced during maintenance and refueling outages, alternate facilities may be established by health physics personnel. The facilities will be provided with the necessary equipment and capabilities to ensu re equivalent control of radioactive materials and personnel, as that provided by the primary RCA Control Point.

12.5.3 Procedures 12.5.3.1 Radiation Surveys Radiological surveys are performed to determine the concentration of radio-act ivity in air, direct radiation from plant components and loose or fixed contamination on surfaces. Written procedures are available which provide the method and frequency of surveys. Surveys are performed on a routine and nonroutine basis. Some factors that determine the frequency and scope of any survey are the locati on of the subject area or equipment, expected occupancy of any area, type of work to be performed, handling of radioactive materials, movement of station personnel and plant operations. The frequency of routine surveys varies from once per shift to annually. Nonroutine surveys are performed as necessary to monitor dismantled equipment contamination, to establis h radiological controls for and during work activities, to determine operational requirements such as the need to change process system filters, and to follow projected changes of radiation fields due to station operations. Instrumentation of the type listed in Table 12.

5-1, Portable Health Physics Instrumentation, is used to determine radiation levels. Routine surveys to determine direct radiation from sources consist of measurements taken at fixed and/or nonfixed locations. The radiation survey data enables health physics personnel to determine trends and locations within an area that may require action to prevent unnecessary exposure accumulation.

S EABROOK STATION UFSAR R ADIATION PROTECTION Health Physics Program Revision 12 Section 12.5 Page 8 Routine surveys to determine area contamination levels may be performed simultaneously with the direct radiation surv eys. This type of survey enables personnel to determine contamination trends and also provides data used to determine if contaminati on control procedures such as those for step-off-pad usage and anti-contaminati on clothing usage are adequate and effective. Surveys to determine airborne radionuclide concentrations are performed routinely and nonroutinely. Areas such as the Spent Fuel Building, sections of the Primary Auxiliary Building, and Waste Processing Buildings are routinely surv eyed for airborne radioactivity. Nonroutine air surveys are provided for initial opening of the primary system and, when necessary, to ensure worker health protection. The surveys mentioned above are in addition to the fixed monitoring instrumentation which has been placed throughout the facili ty and is described in Subs ection 12.3.4, Area Radiation and Airborne Radioactivity Monitoring Instrumentation. 12.5.3.2 Procedures to Maintain Exposures as Low as Reasonably Achievable (ALARA) The general operational concept of ALARA evalua tion, analysis and review is presented in Subsection 12.1.3.1. Specific ALARA review levels and guide-lines are contained in health physics procedures as discussed in Subsection 12.1.3.2. Elements of Regulatory Guide 8.8, Revision 3 are exercised through the use of pre-emptive analysis and planning, ongoing observations and audits and historical analysis and review. Examples of these include daily individual dose-tracking through the use of self-reading pocket dosimeters (SRPDs) or electronic dosimeters and dose-tracking with respect to specific jobs, work groups and components through correlation of data obtained from the radiation work permit system and exposure records.

Dose-tracking in these areas is applied as time, personnel and radiological conditions warrant or health physics supervision deems necessary.

Additionally, general performance guidelines have been iden tified for certain evolutions and operational tasks, such as those discussed below, to further promote personnel radiation exposure reduction.

Refueling procedures state the monitoring requirements, minimum fuel-to-water surface distance, and degassification of the Reactor Coolant System prior to removing the reactor vessel head for refueling operations. During refueling, the reactor coolant is filter ed and cooled to help reduce airborne contamination caused by coolant evaporation.

Prior to initial handling of spent fuel, the equipment used is checked for possible damage and proper operation. During fuel movement the minimu m top of fuel-to-water surface distance is maintained above a level as stated in procedures, and airborne activity will be monitored.

During the initial use of the fuel transfer canal and tube, appropriate areas are barricaded, locked to access, and detailed radiation area surveys are conducted. Thereafter, radiation protection controls are used as necessary.

S EABROOK STATION UFSAR R ADIATION PROTECTION Health Physics Program Revision 12 Section 12.5 Page 9 When shipping spent fuel, an approved cask is used. Fuel is loaded into the cask underwater, then the cask is capped or sealed, raised, surveyed, decontaminate d, if necessary, and resurveyed as necessary for compliance with appropriate federal regulations prior to release. When spent fuel is to be transported to the dry fuel storage site, a licensed cask and transport system is used. Fuel is loaded into the cask underwater, then the cask is capped and sealed, raised, surveyed, decontaminated and resurveyed if necessary for compliance with appropriate federal regulations prior to movement to the dry fuel storage facility. Prior to performing in-service inspection (ISI), the personnel review pr ior inspections, verify proper equipment operation, and revi ew general area radiation levels and hot spot locations in the vicinity of their work. Where practicable, remote ISI techniques are used.

Procedures for radwaste handling reflect th e ALARA philosophy. Radw aste operators are usually stationed at a remote control console from which remote operations can be performed. Remote operations include moving, filling, and sealing containers. Prior to container usage, when possible, shielding and labeling operations are performed. Vehicles used for shipping radwaste are surveyed in accordance with Department of Transportation regulations and Seabrook Station procedures. A ventilation system with exhaust thro ugh a High Efficiency Particulate Air (HEPA) Filter System will be used at the dry waste compaction station. During normal operation plant personnel will receive job-rela ted training. A direct benefit of the training should be a reduction of exposure, which can be attributed to improved efficiency.

Design features of the facility such as reach rods, remote activation controls, and control panels make it possible for most operations to be performed from a low radiation area. Routine maintenance consists of activities such as scheduled and preventive maintenance.

Maintenance procedures are reviewed to ensure completeness. Work on the RCA side of the plant requires a Radiation Work Permit (RWP) with its associated radiological information and requirements. Normally, when work is to be performed involving radiation and/or radioactive materials, the responsible group re quests health physics to determine if a job specific RWP is required. Health physics personnel make the determination in accordance with procedures and, if necessary, investigate the act ual and/or anticipated radiologi cal conditions. If an RWP is necessary, Health Physics spec ifies radiological protection requirements and authorizes, by signature, the issuance of an RW P. Each individual working under the RWP shall initial it or sign an associated form signifying he/she has read and understands the conditions of work. (The control room is aware of work being performed in the Station through the work control procedures. Health Physics notifies the control room if signifi cant changes in the physical or radiological status of the unit occur.) Sample collection by chemistry of the reactor coolant system gas or water is normally obtained at one of the sample stations. The sample st ations are, when require d, equipped with a hood, ventilation system and HEPA filter. Shielded containers and long tongs are available for handling samples when this is necessary. A shielded area has been provided in the radio-chemistry laboratory for the storage of radioactive samples.

S EABROOK STATION UFSAR R ADIATION PROTECTION Health Physics Program Revision 12 Section 12.5 Page 10 Some instrumentation requires in-place exposure to a radioactive source during calibration. The storage and handling of sources is described in Subsection 12.5.3.7. Transfer of the sources to and from the place of calibration is usually done by using a shielded container. During calibration, when possible personnel will use shielding, time, and distance to reduce their exposure. 12.5.3.3 Physical and Administrative Measures for Controlling Access Access to the RCA is limited to those persons whose entry is requested by station supervisors and authorized by health physics personnel. Ev ery area inside the RCA in which radioactive materials and radiation are pr esent shall be surveyed and conspicuously posted with the appropriate radiati on caution sign(s).

Access to high radiation areas is controlled through procedures developed by health physics in accordance with Techni cal Specification 6.11. 12.5.3.4 Contamination Control The limits for surface contamination in the RCA are specified in procedures. When the contamination level limits are exceeded the area will be posted as a "Contaminated Area."

Additionally, all personnel are required to wear protective clothing for entry to "Contaminated Areas." The contaminated area will, when possible, be decontaminated to minimize the spread of contamination. Material and equipment will be given an unconditional release by Health Physics if they meet the criteria as specified by stati on procedures. Authorization for use or movement of radioactive material outside the RCA is obtained from health physics. Cont rol over the packaging, labeling and movement of this material is provided by health physics personnel. The limits for personnel contamination are specified in procedures. When the contamination levels are exceeded, decontamination is performed to reduce the contamination levels to an acceptable value. 12.5.3.5 Personnel Monitoring Dosimetry is issued to visitors and station pe rsonnel in accordance with 10 CFR 20 and health physics procedures.

Surveillance for internal deposition of radionuclides is performed using both in-vivo and in-vitro analysis methods. Health physics procedures delineate analysis frequencies, sensitivities and exposure records dispositions for all analysis performed. 12.5.3.6 Respiratory Protection Program Respiratory protective devices are usually required in situations arising from station operations in which airborne radioactivity areas exist or are expected. In such cases, the airborne concentrations are monitored by health physics personnel and the necessary protective devices are specified according to the concentration and type of airborne contaminants present.

S EABROOK STATION UFSAR R ADIATION PROTECTION Health Physics Program Revision 12 Section 12.5 Page 11 The respiratory protection training program contains information on wearing respirators, a description of how they functi on, why they are used, precautions , how they are cared for, and how they are worn. A second phase of the traini ng consists of a test, put ting on a respirator, and checking for proper fit. Respiratory protection informati on concerning types, uses, clea ning, and storage is given in Subsection 12.5.2.5, Respiratory Protection Equipment. 12.5.3.7 Storage and Handling of Radioactive Sources Radioactive nonexempt sources, not part of an instrument, are controlled by health physics. The controls include source receipt, documentation, leak te sting when required by Technical Specification 3/4.7.8 and assisting with the shipping process.

12.5.3.8 Updating and Auditing of the Health Physics Program In order to keep the health physics program up-t o-date and effective, procedures are reviewed periodically, rewritten as necessary, and audits are performed periodically.

Health physics procedures are re viewed periodically by health physics supervisory personnel. This review will be conducted to determine if existing procedures meet the needs of the department and, if not, to determine what modifications are necessary.

Also, when regulatory requirements change, the procedures that may need to incorporate those requirements are reviewed and, when necessary, changed.

Assessments of the health physics program effectiveness are performed regularly in accordance with 10 CFR 20 requirements. 12.5.3.9 Radiation Protection Training Program The training given plant employees and contractors on radiation protection topics is discussed in Chapter 13.

S EABROOK S TATION U PDATED F INAL S AFETY A NALYSIS R EPORT C HAPTER 12 RADIATION PROTECTION T ABLES S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-1 Revision:

Sheet: 10 1 of 1 TABLE 12.2-1 NEUTRON FLUX SPECTRUM AT REACTOR VESSEL SURFACE

[HISTORICAL]

Energy Flux (n/cm 2-sec) E > 1 MeV 7.3+8* 5.53 keV E <

1 MeV 1.2+10 0.625 eV <

E < 5.53 keV 6.8+9 E < 0.625 eV 1.7+9

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

• 7.3+8 = 7.3x10 8

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-2 Revision:

Sheet: 10 1 of 1 TABLE 12.2-2 GAMMA FLUX SPECTRUM AT REACTOR VESSEL SURFACE

[HISTORICAL]

Energ y MeV Flux (/cm 2-sec) 7.5 3.5+9* 4.0 3.2+9 2.5 1.6+9

0.8 9.6+8

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

• 3.5+9 = 3.5x10 9

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-3 Revision:

Sheet: 10 1 of 2 TABLE 12.2-3 SPENT FUEL SOURCE TERM [HISTORICAL]

(4 DAYS AFTER SHUTDOWN)(1) Energy (MeV)

MeV/cc-sec 0.4 1.16x10 11 0.8 4.90x10 11 1.3 1.80x10 11 1.7 2.50x10 11 2.2 9.68x10 9 2.5 2.68x10 10 3.5 9.80x10 8 (100 HOURS AFTER SHUTDOWN)(2) Energy (MeV)

MeV/cc-sec 0.2-0.4 5.9x10 10 0.4-0.9 4.6x10 11 0.9-1.35 4.9x10 10 1.35-1.8 1.8x10 11 1.8-2.2 1.2x10 10 2.2-2.6 1.1x10 10 2.6-3.0 1.8x10 8 3.0-4.0 7.1x10 7 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

(1) Based on S.L. Anderson, L. Clemons, J.S. Moser, J. Sejvar, "Radiation Analysis Design Manual," WCAP-7664, Rev. 1. (2) Based on "Radiation Analysis Manual Seabrook Units 1 and 2," NAH/3-1, Rev. 3, 11/78.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-3 Revision:

Sheet: 10 2 of 2 TABLE 12.2-3 SPENT FUEL SOURCE TERM (PEAK ASSEMBLY SOURCE TERM 80 HOURS AFTER SHUTDOWN)(3) Energy (MeV)

MeV/cc-sec 0.01 1.592x10 10 0.025 4.804x10 9 0.0375 1.242x10 10 0.0575 7.864x10 9 0.085 3.611x10 10 0.125 1.396x10 11 0.225 1.648x10 11 0.375 1.040x10 11 0.575 4.759x10 11 0.85 7.895x10 11 1.25 1.046x10 11 1.75 4.682x10 11 2.25 2.789x10 10 2.75 2.747x10 10 3.50 2.939x10 8 5.0 8.157x10 2 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

(3) Based on SBC-833, Revison 1, "Minimum Water Depth Shielding Requirements for Peak Power Fuel Assembly with Extended Burnup."

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-4 Revision:

Sheet: 10 1 of 1 TABLE 12.2-4 REACTOR COOLANT N-16 ACTIVITY

• [HISTORICAL]

Position in Loop Loop Transit Time (sec)

N-16 Activity Ci/gram Leaving core 0 189 Leaving reactor vessel 1.1 170 Entering steam generator 1.4 164 Leaving steam generator 5.4 112

Entering reactor coolant pump 6.0 106 Entering reactor vessel 6.8 98 Entering core 9.0 86 Leaving core 9.7 189

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a mi nor change in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

• S.L. Anderson, L. Clemons, J.S. Moser, J. Sejvar, "Radiation Analysis Design Manual," WCAP-7664, Rev. 3.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-5 Revision:

Sheet: 12 1 of 5 TABLE 12.2-5 SOURCE TERMS FOR THE CH EMICAL AND VOLUME CONTROL SYSTEM [HISTORICAL] 1. Regenerative Heat Exchanger And Excess Letdown Heat Exchanger Gamma Energy (Mev/gamma)

Specific Source Strength (MeV/gm-sec) 0.4 4.5(+5) 0.8 2.7(+5) 1.3 1.7(+5) 1.7 1.2(+5) 2.2 1.4(+5) 2.5 1.6(+5) 3.5 1.9(+4) 6.1 2.2(+6) 7.1 1.8(+5) 2. Letdown Hbdt Exchanger See Table 11.1-1 3. Mixed Bed Demineralizers and Cation Bed Demineralizer Isotope (Curies) Mixed Bed (Curies) Cation Bed Isotope (Curies) Mixed Bed (Curies) Cation Bed I-131 1.2(+4) - Cs-134 4.0(+3) 4.0(+3)

I-132 7.3(+2) - Cs-136 3.8(+1) 3.8(+1) I-133 2.9(+3) - Cs-137 2.7(+4) 2.7(+4) I-134 1.4(+2) - Te-132 5.3(+2) 5.3(+2) I-135 8.6(+2) - Ba-140 3.1(+1) 3.1(+1) La-140 3.2(+1) 3.2(+1) Sr-89 9.1(+1) 9.1(+1) Ce-144 3.6(+1) 3.6(+1) Sr-90 2.1(+1) 2.1(+1) Sr-91 9.0(-1) 9.0(-1) Mn-54 6.8(+1) 6.8(+1) Mn-56 1.9(+0) 1.9(+0)

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-5 Revision:

Sheet: 12 2 of 5 Y-90 2.0(+1) 2.0(+1) Y-91 2.1(+1) 2.1(+1) Co-58 1.0(+3) 1.0(+3) Y-92 5.4(-2) 5.4(-2) Co-60 8.6(+1) 8.6(+1) Zr-95 2.4(+1) 2.4(+1) Fe-59 2.9(+1) 2.9(+1) Nb-95 1.4(+1) 1.4(+1) Cr-51 1.5(+1) 1.5(+1) Mo-99 1.3(+3) 1.3(+3)

4. Letdown Degasifier Regenerative Heat Exchanger, Tube Side Letdown Degasifier Preheater Letdown Degasifier, Liquid-Vapor Region Moderating Heat Exchanger, Tube Side Letdown Chiller Heat Exchanger, Tube Side and Letdown Reheat Heat Exchanger, Shell Side Isotope Ci/gm Isotope Ci/gm I-131 2.5(-1) Mn-54 7.9(-5)

I-132 9.1(-2) Mn-56 3.0(-3)

I-133 4.0(-2) Co-58 2.6(-3) I-134 5.8(-2) Co-60 7.7(-5) I-135 2.2(-1) Fe-59 1.1(-4) Cr-51 9.5(-5) Sr-89 4.1(-4)

Sr-90 1.8(-5) Kr-83m 4.3(-1)

Sr-91 3.1(-3) Kr-55m 1.7(+0) Y-90 2.2(-5) Kr-85 1.3(-1)

Y-91 5.8(-4) Kr-87 1.3(+0) Y-92 1.0(-4) Kr-88 3.4(+0) Zr-95 6.7(-5) Nb-95 6.8(-5) Xe-131m 6.7(-2) Mo-99 3.3(-1) Xe-133m 5.7(-1) Cs-134 2.2(-1) Xe-133 2.5(+1) Cs-136 1.1(-1) Xe-135m 8.2(-1) Cs-137 1.1(+0) Xe-135 3.1(+0) Te-132 2.6(-2) Xe-137 1.7(-1)

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-5 Revision:

Sheet: 12 3 of 5 Ba-140 4.5(-4) Xe-138 7.1(-1) La-140 1.4(-4) Ce-144 4.4(-5)

5. Letdown Degasifier Regenerative Heat Exchanger, Shell Side Letdown Degasifier, Liquid Region Letdown Degasifier Recirculation Pump and Letdown Degasifier Trim Cooler Isotope Ci/gm Isotope Ci/gm I-131 2.5(-1) Mo-99 3.3(-1)

I-132 9.1(-2) Cs-134 2.2(-1) I-133 4.0(-2) Cs-136 1.1(-1) I-134 5.8(-2) Cs-137 1.1(+0)

I-135 2.2(-1) Te-132 2.6(-2) Ba-140 4.5(-4) Sr-89 4.1(-4) La-140 1.4(-4)

Sr-90 1.8(-5) Ce-144 4.4(-5) Sr-91 3.1(-3) Y-90 2.2(-5) Mn-54 7.9(-5) Y-91 5.8(-4) Mn-56 3.0(-3) Y-92 1.0(-4) Co-58 2.6(-3) Zr-95 6.7(-5) Co-60 7.7(-5) Nb-95 6.8(-5) Fe-59 1.1(-4) Cr-51 9.5(-5)

6. Letdown Degasifier, Vapor Region Isotope Ci/cc I-131 1.2(-1) I-132 3.8(-2)

I-133 1.9(-1) I-134 2.0(-2) I-135 1.0(-1)

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-5 Revision:

Sheet: 12 4 of 5 Kr-83m 2.4(+1) Kr-85m 1.0(+2) Kr-85 8.4(+0) Kr-87 6.6(+1) Kr-88 2.0(+2) Xe-131m 4.3(+0)

Xe-133m 3.6(+1) Xe-133 1.6(+3) Xe-135m 2.4(+1) Xe-135 1.9(+2) Xe-137 1.8(+0)

Xe-138 1.9(+1)

7. Volume Control Tank, Liquid and Charging Pumps Same as reactor coolant, less noble gases. 8. Volume Control Tank, Vapor Isotope Ci/cc Isotope Ci/cc I-131 9.8(-1) Kr-87 5.1(+0)

I-132 4.6(-2) Kr-88 2.7(+1) I-133 9.4(-1)

I-134 1.2(-2) Xe-131m 3.7(+0) I-135 2.6(-1) Xe-133m 2.5(+1) Xe-133 1.3(+3) Kr-83m 2.4(+0) Xe-135m 1.1(+1) Kr-85m 2.0(+1) Xe-135 8.5(+1) Kr-85 7.4(+0) Xe-137 3.6(-2) Xe-138 5.5(-1)

9. Seal Water Heat Exchanger See Table 11.1-1

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-5 Revision:

Sheet: 12 5 of 5 10. Moderating Heat Exchanger, Shell Side Isotope Ci/gm Isotope Ci/gm Isotope Ci/gm Cr-51 9.5-5 Mo-99 3.3-1 Kr-83m 4.3-1 Mn-54 7.9-5 Te-132 2.6-2 Kr-85m 1.7+0 Mn-56 3.0-3 Cs-134 2.2-1 Kr-85 1.3-1 Fe-59 1.1-4 Cs-136 1.1-1 Kr-87 1.3+0 Co-58 2.6-3 Cs-137 1.1+0 Kr-88 3.4+0 Co-60 7.7-5 Ba-140 4.5-4 Xe-131m 6.7-2 La-140 1.4-4 Xe-133m 5.7-1 Sr-89 4.1-4 Ce-144 4.4-5 Xe-133 2.5+1 Sr-90 1.8-5 I-131 3.4+2 Xe-135m 8.2-1 Sr-91 3.1-3 I-132 3.4+1 Xe-135 3.1+0 Y-90 2.2-5 I-133 4.6+2 Xe-137 1.7-1 Y-91 5.8-4 I-134 8.4+0 Xe-138 7.1-1 Y-92 1.0-4 I-135 1.8+2 Zr-95 6.7-5 Nb-95 6.8-5 11. Letdown Reheat Heat Exchanger, Tube Side Same as reactor coolant, see Table 11.1-1

12. Thermal Regeneration Demineralizer Iodine Curies Ci/cc I-131 8.0(+1) 1.7(+2)

I-132 8.0(+0) 1.7(+1)

I-133 1.1(+2) 2.3(+2) I-134 2.0(+0) 4.2(+0) I-135 4.1(+1) 8.8(+1)

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology descri bed in Section 12.2 used for the original shieldi ng design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-6 Revision:

Sheet: 8 1 of 3 TABLE 12.2-6 GEOMETRY OF EQUIPMENT IN THE CHEMICAL AND VOLUME CONTROL SYSTEM Regenerative Heat Exchanger

- Horizontal Sections (2)

Diameter 6 in. Length 15 ft - Vertical Section (1)

Diameter 10 in. Length 3 ft 7 in.

Excess Letdown Heat Exchanger Diameter 8 in. Length 13 ft 3 Volume of source fluid 1.15 ft Letdown Heat Exchanger Diameter 22 in. Length 15 ft Volume of source fluid 75 gal. Mixed Bed Demineralizer Diameter 32 in. Height of resin 65 in. Cation Bed Demineralizer Diameter 32 in. Height of resin 65 in. Letdown Degasifier Regen. Heat Exchanger Diameter 11 in. Length 15 ft 4 in.

Degasifier Preheater Diameter 8 in. Length 15 ft 4 in. Volume source fluid 21 ft 3 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-6 Revision:

Sheet: 8 2 of 3 Letdown Degasifier Upper Part: Diameter 24 in. Length 12 ft 4 in. Lower Part: Diameter 36 in. Length 6 ft 11 in. Letdown Degasifier Recirculation Pump Diameter 8 in. Length 2 in. Letdown Degasifier Trim Cooler Diameter 11 in. Length 15 ft 4 in. Volume source fluid 3.6 ft 3 Volume Control Tank Diameter 108 in. Height 144 in. Vapor Volume 420 ft 3 Charging Pumps

- Centrifugal Diameter 14 in. Length 48 in. - Reciprocal Diameter 4 in. Length 43 in. Seal Water Heat Exchanger Diameter 14 in. Length 13 ft 9 in. Volume of source fluid 14.7 ft 3 Moderating Heat Exchanger Diameter 18 in. Length 18 ft 2 in. Shell Side Volume 17.2 ft 3 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-6 Revision:

Sheet: 8 3 of 3 Letdown Chiller Heat Exchanger Diameter 20 in. Length 205 in. Volume source fluid 9.5 ft 3 Letdown Reheat Heat Exchanger Diameter 8 5/8 in. Length 87 in. Thermal Regeneration Demineralizers Diameter 48 in. Height of resin 72 in. Filters Diameter 7 in. Length 28 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-7 Revision:

Sheet: 10 1 of 1 TABLE 12.2-7 SOURCE TERMS FOR RESIDUAL HEAT REMOVAL SYSTEM

[HISTORICAL]

Isotope Ci/gm Isotope Ci/gm I-131 2.3+0Z r-95 6.4-4 I-132 4.3-1 Nb-95 6.5-4 I-133 3.3+0 Mo-99 3.0+0 I-134 2.3-2 Cs-134 3.5-1 I-135 1.4+0Cs-136 1.7-1 Cs-137 1.7+0 K r-83 m 9.8-5 Te-132 2.4-1 K r-85 m 9.0-1 Ba-140 4.3-3 K r-85 1.3-1 La-140 1.5-3 K r-87 1.5-1 Ce-144 4.2-4 K r-88 1.3+0 Mn-54 7.5-4 Xe-131 m 6.6-2 Mn-56 9.6-3 Xe-133 m 5.5-1 Co-58 2.5-2 Xe-133 2.5+1Co-60 7.3-4 Xe-135 m 4.5-1 Fe-59 1.0-3 Xe-135 2.8+0 C r-51 9.0-4 Xe-137 Xe-138 5.8-6 S r-89 3.9-3 S r-90 1.7-4 S r-91 2.2-2 Y-90 2.1-4 Y-91 5.6-3 Y-92 4.4-4 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-8 Revision:

Sheet: 8 1 of 1 TABLE 12.2-8 GEOMETRY OF EQUIPMENT IN RHR SYSTEM RHR Heat Exchanger:

Mass of source fluid 5400 lbs.

Length 285 inches Diameter 44 inches RHR Pump Volume of source fluid 3.2 ft 3 Length 19 inches Diameter 9.5 inches S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-9 Revision:

Sheet: 10 1 of 6 TABLE 12.2-9 STEAM GENERATOR BLOWDOWN SYSTEM SOURCE TERMS

[HISTORICAL] System Input Isotope Ci/gm Isotope Ci/gm I-131 1.2-2 Mo-99 1.5-2 I-132 4.2-3 Cs-134 2.0-3 I-133 1.9-2 Cs-136 1.0-3 I-134 2.7-3 Cs-137 1.0-2 I-135 1.0-2 Te-132 1.2-3 Ba-140 2.1-5 Sr-89 1.9-5 La-140 6.5-6 Sr-90 8.3-7 Ce-144 2.0-6 Sr-91 1.4-4 Y-90 1.0-6 Mn-54 3.7-6 Y-91 2.7-5 Mn-56 1.4-4 Y-92 4.6-6 Co-58 1.2-4 Zr-95 3.1-6 Mn-60 3.6-6 Nb-95 3.1-6 Fe-59 5.1-6 Cr-51 4.4-6 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-9 Revision:

Sheet: 10 2 of 6 1. Flash Tank Isotope Water (Ci/gm) Steam (Ci/cc) Isotope Water (Ci/gm) Steam (Ci/cc) I-131 1.7-2 1.9-6 Mo-99 2.1-2 2.4-6 I-132 6.0-3 6.7-7 Cs-134 2.9-3 3.2-7 I-133 2.7-2 3.0-6 Cs-136 1.4-3 1.6-7 I-134 3.9-3 4.3-7 Cs-137 1.4-2 1.6-6 I-135 1.4-2 1.6-6 Te-132 1.7-3 1.9-7 Ba-140 3.0-5 3.3-9 La-140 9.3-6 1.0-9 Sr-89 2.7-5 3.0-9 Ce-144 2.9-6 3.2-10 Sr-90 1.2-6 1.3-10 Sr-91 2.0-4 2.2-8 Mn-54 5.3-6 5.9-10 Y-90 1.4-6 1.6-10 Mn-56 2.0-4 2.2-8 Y-91 3.9-5 4.3-9 Co-58 1.7-4 1.9-8 Y-92 6.6-6 7.3-10 Co-60 5.1-6 5.7-10 Zr-95 4.4-6 4.9-10 Fe-59 7.3-6 8.1-10 Nb-95 4.4-6 4.9-10 Cr-51 6.3-6 7.0-10 2. Blowdown Heat Exchangers See water above Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-9 Revision:

Sheet: 10 3 of 6 3. Flash Steam Condenser/Cooler Flash Tank and Distillate Pumps Isotope Ci/gm Isotope Ci/gm I-131 8.6(-4) Mo-99 1.1(-3) I-132 3.0(-4) Cs-134 1.4(-4)

I-133 1.4(-3) Cs-136 7.1(-5)

I-134 1.9(-4) Cs-137 7.1(-4)

I-135 7.1(-4) Te-132 8.6(-5) Ba-140 1.5(-6) Sr-89 1.4(-6) La-140 4.6(-7)

Sr-90 5.9(-8) Ce-144 1.4(-7)

Sr-91 1.0(-5) Y-90 7.1(-8) Mn-54 2.6(-7)

Y-91 1.9(-6) Mn-56 1.0(-5)

Y-92 3.3(-7) Co-58 8.6(-6) Zr-95 2.2(-7) Co-60 2.6(-7) Nb-95 2.2(-7) Fe-59 3.6(-7) Cr-51 3.1(-7)

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-9 Revision:

Sheet: 10 4 of 6 4. Evaporator Bottoms Isotope Ci Ci/gm Isotope Ci Ci/gm Cr-51 6.3(-2) 1.3(-2) Mo-99 2.5(+1) 5.0(+0) Mn-54 1.2(-1) 2.4(-2) I-131 5.4(+1) 1.1(+1) Mn-56 8.6(-3) 1.8(-3) Te-132 2.3(+0) 4.6(-1) Co-58 2.9(+0) 5.9(-1) I-132 2.5(+0) 5.1(-1) Fe-59 1.0(-1) 2.0(-2) I-133 9.3(+0) 1.9(+0) Co-60 1.3(-1) 2.6(-2) I-134 5.7(-2) 1.1(-2) Sr-89 4.0(-1) 8.0(-2) Cs-134 7.1(+1) 1.4(+1)

Sr-90 3.0(-2) 6.1(-3) I-135 1.7(+0) 3.4(-1) Y-90 3.0(-2) 6.2(-3) Cs-136 7.6(+0) 1.5(+0) SR-91 3.4(-2) 6.8(-3) Cs-137 3.7(+2) 7.5(+1) Y-91 6.1(-1) 1.2(-1) Ba-140 1.5(-1) 3.1(-2)

Y-92 4.0(-4) 8.0(-5) La-140 1.6(-1) 3.2(-2) Zr-95 7.2(-2) 1.5(-2) Ce-144 6.6(-2) 1.3(-2) Nb-95 9.6(-2) 2.0(-2) Total 5.5(+2) 1.1(+2)

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-9 Revision:

Sheet: 10 5 of 6 5. Evaporator Distillate Isotope Ci/cc Isotope Ci/cc Cr-51 1.1(-9) I-131 2.9(-5) Mn-54 9.2(-10) Te-132 3.0(-7) Mn-56 3.4(-8) I-132 1.0(-5) Co-58 3.0(-8) I-133 4.6(-5) Fe-59 1.3(-9) I-134 6.3(-6) Co-60 8.9(-10) Cs-134 5.1(-7) I-135 2.5(-5) Sr-89 4.7(-9) Cs-136 2.5(-7)

Sr-90 2.1(-10) Cs-137 2.5(-6) Y-90 2.5(-10) Ba-140 5.2(-9) Sr-91 3.6(-8) La-140 1.6(-9) Y-91 6.7(-9) Ce-144 5.1(-10)

Y-92 1.1(-9) Zr-95 7.8(-10) Xe-131m 3.6(-9) Nb-95 7.9(-10) Xe-133m 1.2(-7) Mo-99 3.8(-6) Xe-133 2.1(-6) Xe-135m 1.4(-4) Xe-135 1.2(-5) Total 2.8(-4)

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-9 Revision:

Sheet: 10 6 of 6 6. Evaporator Distillate Condensate Isotope Ci/gm Isotope Ci/gm Cr-51 9.4(-7) Mo-99 3.3(-3) Mn-54 7.9(-7) I-131 2.5(-2)

Mn-56 2.9(-5) Te-132 2.6(-4)

Co-58 2.6(-5) I-132 8.6(-3)

Fe-59 1.1(-6) I-133 4.0(-2)

Co-60 7.6(-7) I-134 5.4(-3)

Sr-89 4.0(-6) Cs-134 4.4(-4)

Sr-90 1.8(-7) I-135 2.2(-2)

Y-90 2.1(-7) Cs-136 2.2(-4)

Sr-91 3.1(-5) Cs-137 2.2(-3)

Y-91 5.8(-6) Ba-140 4.5(-6)

Y-92 9.4(-7) La-140 1.4(-6)

Zr-95 6.7(-7) Ce-144 4.4(-7)

Nb-95 6.8(-7)

Total 1.1(-1)

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-10 Revision:

Sheet: 8 1 of 2 TABLE 12.2-10 GEOMETRY OF EQUIPMENT IN STEAM GENERATOR BLOWDOWN SYSTEM Flash Tank Height (water/vapor) 45/104 inches Diameter 36 inches Steam/Water Mass Ratio 3/7 Flash Tank Bottoms Cooler Volume Source Fluid 25 gallons Length 124 inches Diameter 16 inches Flash Steam Condenser/Cooler Volume Source Fluid 55 gallons Length 136 inches Diameter 24 inches Flash Tank Distillate Pumps Diameter 8 inches Length 2 inches Blowdown Evaporator Volume of Source Liquid 174.8 ft 3 Diameter 78 inches Height 112 inches S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-10 Revision:

Sheet: 8 2 of 2 Bottoms Pump Diameter 8 inches Length 2 inches Bottoms Cooler

12 straight sections 11 curved sections Straight section:

Volume Source Liquid 150 in.3 Diameter 1.5 in. Length 10 ft Curved Section:

Diameter 1.25 in. Radius of curve 4.5 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-11 Revision:

Sheet: 10 1 of 5 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations. TABLE 12.2-11 SOURCE TERMS FOR BORON RECOVERY SYSTEM

[HISTORICAL] System Input Isotope Ci/gm Isotope Ci/gm Cr-51 9.5(-5) I-131 2.5(-1) Mn-54 7.9(-5) Te-132 2.6(-2) Mn-56 3.0(-3) I-132 9.1(-2) Co-58 2.6(-3) I-133 4.0(-1) Fe-59 1.1(-4) I-134 5.8(-2) Co-60 7.7(-5) Cs-134 2.2(-1) I-135 2.2(-1) Sr-89 4.1(-4) Cs-136 1.1(-1)

Sr-90 1.8(-5) Cs-137 1.1(+0) Y-90 2.2(-5) Ba-140 4.5(-4) Sr-91 3.1(-3) La-140 1.4(-4) Y-91 5.8(-4) Ce-144 4.4(-5)

Y-92 1.0(-4) Zr-95 6.7(-5) Nb-95 6.8(-5) Mo-99 3.3(-1)

S EABROOK S TATION UFSAR R ADIATION PROTECTION SECTION 12-2-11 T ABLE Revision:

Sheet: 10 2 of 5 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumption s and methodology described in Section 12.2 used for the original sh ielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-m onth fuel cycle represents a minor change in the original design basis and will have no significant impact on shielding requirements and safe plant operations. Isotope CRIE (Ci) BWST (Ci) Pump (Ci/gm) EvaporatorBottom (Ci) Bottom Pump & Cooler (Ci/gm) Distillate Conc. (Ci/gm) Distillate Condensate (Ci/gm) Recovery Test Tk.(Ci) Recovery Test Tk. Pump (Ci/gm) Demin.(Ci) Cr-51 5.0(-2) 4.6(-3) 9.5(-6) 4.3(-3) 7.5(-4) 6.3(-12) 5.4(-9) 3.7(-7) 2.8(-6) Mn-54 1.4(-1) 6.3(-3) 7.9(-6) 6.3(-3) 1.1(-3) 8.6(-12) 7.4(-9) 5.0(-7) 1.3(-5) Mn-56 3.8(-1) 3.8(-2) 3.0(-4) 9.3(-4) 1.6(-4) 5.1(-11) 4.4(-8) 8.9(-7) 2.7(-7) Co-58 2.5(+0) 1.7(-1) 2.6(-4) 1.7(-1) 2.9(-2) 2.3(-10) 2.0(-7) 1.4(-5) 1.9(-4) Fe-59 7.8(-2) 6.4(-3) 1.1(-5) 6.1(-3) 1.1(-3) 8.7(-12) 7.5(-9) 5.1(-7) Same as Evaporator Distillate Condensate Concentration 5.2(-6) Co-60 1.8(-1) 6.5(-3) 7.7(-6) 6.5(-3) 1.1(-3) 8.9(-12) 7.6(-9) 5.2(-7) 1.7(-5) Sr-89 3.1(-1) 2.5(-2) 4.1(-5) 2.4(-2) 4.2(-3) 3.4(-11) 2.9(-8) 2.0(-6) 2.2(-5) Sr-90 4.3(-2) 1.5(-3) 1.8(-6) 1.5(-3) 2.7(-4) 2.1(-12) 1.8(-9) 1.2(-7) 4.3(-6) Y-90 4.4(-2) 1.6(-3) 2.2(-6) 1.6(-3) 2.8(-4) 2.2(-12) 1.9(-9) 1.3(-7) 4.3(-6) Sr-91 6.1(-1) 6.1(-2) 3.1(-4) 5.6(-3) 9.9(-4) 8.3(-11) 7.1(-8) 3.3(-6) 3.6(-6) Y-91 4.9(-1) 3.7(-2) 5.8(-5) 3.6(-2) 6.3(-3) 5.0(-11) 4.3(-8) 2.9(-6) 3.6(-5)

Y-92 1.5(-1) 1.5(-3) 1.0(-5) 4.9(-5) 8.7(-6) 2.0(-12) 1.7(-9) 4.5(-8) 1.9(-8) Zr-95 6.0(-2) 4.3(-3) 6.7(-6) 4.1(-3) 7.3(-4) 5.8(-12) 5.0(-9) 3.4(-7) 4.5(-6) Nb-95 8.4(-2) 5.2(-3) 6.8(-6) 5.1(-3) 9.1(-4) 7.1(-12) 6.1(-9) 4.2(-7) 6.9(-6) Mo-99 8.3(+1) 8.3(+0) 3.3(-2) 4.2(+0) 7.4(-1) 1.1(-8) 9.7(-6) 6.2(-4) 1.9(-3) I-131 0 7.8(+1) 2.5(-1) 6.1(+1) 1.1(+1) 1.1(-6) 9.2(-4) 6.1(-2) 2.6(-1) Te-132 6.7(+0) 6.7(-1) 2.6(-3) 3.7(-1) 6.6(-2) 9.2(-10) 7.9(-7) 5.1(-5) 1.6(-4) I-132 6.7(+0) 1.1(+1) 9.1(-2) 6.1(-1) 1.1(-1) 1.5(-7) 1.3(-4) 2.4(-3) 8.1(-4)

S EABROOK S TATION UFSAR R ADIATION PROTECTION SECTION 12-2-11 T ABLE Revision:

Sheet: 10 3 of 5 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumption s and methodology described in Section 12.2 used for the original sh ielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-m onth fuel cycle represents a minor change in the original design basis and will have no significant impact on shielding requirements and safe plant operations. Isotope CRIE (Ci) BWST (Ci) Pump (Ci/gm) EvaporatorBottom (Ci) Bottom Pump & Cooler (Ci/gm) Distillate Conc. (Ci/gm) Distillate Condensate (Ci/gm) Recovery Test Tk.(Ci) Recovery Test Tk. Pump (Ci/gm) Demin.(Ci) I-133 0 8.8(+1) 4.0(-1) 1.7(+1) 3.0(+0) 1.2(-6) 1.0(-3) 5.6(-2) 1.1(-1) I-134 0 3.3(+0) 5.8(-2) 2.7(-2) 4.8(-3) 4.4(-8) 3.8(-5) 2.7(-4) 2.9(-5) Cs-134 4.7(+2) 1.8(+1) 2.2(-2) 1.8(+1) 3.1(+0) 2.4(-8) 2.1(-5) 1.4(-3) 4.5(-2) I-135 0 4.0(+1) 2.2(-1) 2.6(+0) 4.5(-1) 5.5(-7) 4.7(-4) 1.8(-2) 1.5(-2) Cs-136 4.0(+1) 4.0(+0) 1.1(-2) 3.4(+0) 6.0(-1) 5.5(-9) 4.7(-6) 3.2(-4) 1.6(-3)

Cs-137 2.6(+3) 9.4(+1) 1.1(-1) 9.4(+1) 1.7(+1) 1.3(-7) 1.1(-4) 7.5(-3) 2.6(-1) Ba-140 1.6(-1) 1.6(-2) 4.5(-5) 1.4(-2) 2.4(-3) 2.2(-11) 1.9(-8) 1.3(-6) 6.6(-6) La-140 9.9(-2) 9.8(-3) 1.4(-5) 1.3(-2) 2.3(-3) 1.4(-11) 1.2(-8) 8.6(-7) 6.0(-6) Ce-144 7.8(-2) 3.5(-3) 4.4(-6) 3.5(-3) 6.1(-4) 4.8(-12) 4.1(-9) 2.8(-7) 7.3(-6) Xe-131m 1.3(-1) 1.9(-12)

Xe-133m 1.5(-1) 4.5(-11) Xe-133 4.9(+0) 7.8(-10) Xe-135m 1.2(+1) 5.4(-0) Xe-135 7.5(+0) 3.6(-9) Total 3.2(+3) 3.7(+2) 1.1(+0) 2.0(+2) 3.6(+1) 3.2(-6) 2.7(-3) 1.6(-1) 6.9(-1)

S EABROOK S TATION UFSAR R ADIATION PROTECTION SECTION 12.2-11 T ABLE Revision:

Sheet: 10 4 of 5 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

Recovery Evaporator Feed Concentrations Isotope Ci/gm Isotope Ci/gm Cr-51 5.4(-6) Mo-99 9.7(-3) Mn-54 7.4(-6) I-131 9.2(-2)

Mn-56 4.4(-5) Te-132 7.9(-4)

Co-58 2.0(-4) I-132 1.3(-2)

Fe-59 7.5(-6) I-133 1.0(-l)

Co-60 7.6(-6) I-134 3.3(-3)

Cs-134 2.1(-2)

Sr-89 2.9(-5) I-135 4.7(-2)

Sr-90 1.8(-6) Cs-136 4.7(-3)

Y-90 1.9(-6) Cs-137 1.1(-1)

Sr-91 7.1(-5) Ba-140 1.9(-5)

Y-91 4.3(-5) La-140 1.2(-5)

Y-92 1.5(-6) Ce-144 4.1(-6)

Zr-95 5.0(-6)

Nb-95 6.1(-6)

S EABROOK S TATION UFSAR R ADIATION PROTECTION SECTION 12.2-11 T ABLE Revision:

Sheet: 10 5 of 5 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

Recovery Test Tank Concentrations Isotope Ci/gm Isotope Ci/gm Cr-51 5.4(-9) Mo-99 9.1(-6) Mn-54 7.4(-9) I-131 9.0(-4)

Mn-56 1.3(-8) Te-132 7.5(-7)

Co-58 2.0(-7) I-132 3.5(-5)

Fe-59 7.5(-9) I-133 8.2(-4)

Co-60 7.6(-9) I-134 9.0(-6)

Sr-89 2.9(-8) Cs-134 2.1(-5)

Sr-90 1.8(-9) I-135 2.7(-4)

Y-90 1.9(-9) Cs-136 4.6(-6)

Sr-91 4.8(-8) Cs-137 1.1(-4)

Y-91 4.3(-8) Ba-140 1.9(-8)

Y-92 6.3(-10) La-140 1.3(-8)

Zr-95 5.1(-9) Ce-144 4.1(-9)

Nb-95 6.1(-9)

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-12 Revision:

Sheet: 8 1 of 3 TABLE 12.2-12 GEOMETRY OF EQUIPMEN T IN BORON RECOVERY SYSTEM Cesium Removal Ion Exchanger Diameter 48 in. Height 7 ft 3 Volume of Resin 75 ft Boron Waste Storage Tank Diameter 32 ft Height 38 ft 5 in. Volume 225,000 Gal. Recovery Evaporator Feed Pump Diameter 6 in. Length 2 in. Recovery Evaporator Lower Part Upper Part Vapor Space Diameter 2 ft 6 in.

5 ft 6 in.

5 ft 6 in.

Height 13 ft 6 in.

3 ft 3 in.

8 ft 9 in. Recovery Evaporator Bottoms Pump Diameter 6 in. Length 2 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-12 Revision:

Sheet: 8 2 of 3 Recovery Evaporator Bottoms Cooler Straight Section (Qty 12) Length 10 ft Diameter 1.5 in. Volume Source 150 in.3 Curved Section (Qty 11) Diameter 1.25 in. Radius of Curve 4.5 in. Recovery Evaporator Reboiler Pump Volume 20 ft 3 Diameter 24 in. Recovery Evaporator Reboile r Diameter 36 in. Height 14 ft Volume Source Fluid 31 ft 3 Recovery Evaporator Distillate Condenser Diameter 26 in. Length 72 in. Volume Source 16 ft 3 Recovery Evaporator Distillate Accumulator Diameter 26 in. Length 11 ft S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-12 Revision:

Sheet: 8 3 of 3 Recovery Evaporator Distillate Pump Diameter 6 in. Length 2 in. Recovery Evaporator Distillate Cooler Length 11 ft 9 in. Diameter 21 in. Volume Source Liquid 8.7 ft 3 Recovery Test Tank Pump Diameter 6 in. Length 2 in. Recovery Test Tank Diameter 15 ft Height 16 ft 6 in. Volume 18,000 gallons Recovery Demineralizer Diameter 48 in. Height 7 ft 8 in. Volume of Resin 75 ft 3 Recovery System Filters Diameter 7 in. Height 28 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-13 Revision:

Sheet: 10 1 of 1 TABLE 12.2-13 SOURCE TERMS FOR THE PRIMARY DRAIN SYSTEM

[HISTORICAL] System Input Same as reactor coolant concentrations (see Table 11.1-1). 1. Primary Drain Tank Primary Drain Tank Transfer Pump Primary Drain Tank Regenerative Heat Exchanger Primary Drain and Tank Degasifier Preheater Same as reactor coolant concentrations (see Table 11.1-1).

2. Primary Drain Tank Degasifier Liquid and liquid-steam region: Same as reactor coolant concentrations less noble gases. Gas Region: Isotope Ci/cc I-131 1.2(+0) I-132 3.8(-1) I-133 1.9(+0) I-134 2.0(-1) I-135 1.0(+0) Kr-83m 2.4(+1) Kr-85m 1.0(+2) Kr-85 8.4(+0) Kr-87 6.6(+1) Kr-88 2.0(+2) Xe-131m 4.3(+0) Xe-133m 3.6(+1) Xe-133 1.6(+3) Xe-135m 2.4(+1) Xe-135 1.9(+2) Xe-137 1.8(+0) Xe-138 1.9(+1) Total 2.3(+3) Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-14 Revision:

Sheet: 8 1 of 2 TABLE 12.2-14 GEOMETRY OF EQUIPMENT IN PRIMARY DRAIN SYSTEM Primary Drain Tank (PDT)

Diameter 11 ft Height 147 in. PDT Transfer Pump Diameter 6 in. Length 2 in. PDT Regenerative Heat Exchanger Diameter 11 in. Length 15 ft 4 in.

PDT Degasifier Preheater Diameter 8 in. Length 15 ft 4 in. Volume Source Fluid 2.1 ft 3 PDT Degasifier Gas Region:

Diameter 24 in.3 Volume 7 ft Liquid-Steam Region:

Diameter 24 in. Height 12 ft 4 in.

Liquid Region:

Diameter 36 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-14 Revision:

Sheet: 8 2 of 2 Height 6 ft 11 in. PDT Degasifier Recirculation Pump Diameter 8 in. Length 2 in. PDT Degasifier Trim Cooler Diameter 11 in. Length 15 ft 4 in. Volume Source Fluid 3.6 ft 3 PDT Degasifier Prefilter Diameter 7 in. Length 28 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-15 Revision:

Sheet: 10 1 of 2 TABLE 12.2-15 SOURCE TERMS FOR SPENT RESIN SLUICE SYSTEM

[HISTORICAL] 1. Spent Resin Sluice Tank and Spent Resin Transfer Pump Isotope Total (Ci) Conc. (Ci/gm) Cr-51 1.5(+1) 8.1(-1) Mn-54 6.6(+1) 3.6(+0) Mn -

Co-58 9.9(+2) 5.4(+1) Fe-59 2.8(+1) 1.5(+0) Co-60 8.4(+1) 4.6(+0) Sr-89 9.1(+1) 4.9(+0) Sr-90 2.0(+1) 1.1(+0) Y-90 2.0(+1) 1.1(+0) Sr -

Y-91 2.0(+1) 1.1(+0) Y -

Zr-95 2.4(+1) 1.3(+0) Nb-95 1.3(+1) 7.1(-1) Mo-99 1.3(+3) 7.1(+1) I-131 1.2(+4) 6.5(+2) Te-132 5.3(+2) 2.9(+1) I-132 5.3(+2) 2.9(+1) I-133 - -

I-134 - -

Cs-134 4.7(+3) 2.6(+2) I-135 - -

Cs-136 1.7(+2) 9.2(+0) Cs-137 2.7(+4) 1.5(+3)

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-15 Revision:

Sheet: 10 2 of 2 Ba-140 3.1(+1) 1.7(+0) La-140 3.1(+1) 1.7(+0) Ce-144 3.6(+1) 2.0(+0) Total 4.8(+4) 2.6(+3) 2. Spent Resin Sluice Pump Concentrations are 10

-4 that of the sluice tank

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-16 Revision:

Sheet: 8 1 of 1 TABLE 12.2-16 GEOMETRY OF EQUIPMENT IN SPENT RESIN SLUICE SYSTEM Spent Resin Sluice Tank Diameter 11 ft Height 16 ft Volume of Resin 650 ft 3 Spent Resin Transfer Pump Diameter 6 in. Length 72 in. Volume 0.6 ft 3 Spent Resin Sluice Pump Diameter 8 in. Length 2 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-17 Revision:

Sheet: 10 1 of 1 TABLE 12.2-17 SOURCE TERM FOR SPENT FUEL POOL CLEANUP SYSTEM

[HISTORICAL] Spent Fuel Pool Demineralizer Isotope Ci/cc Isotope Ci/cc Cr-51 4.62-4 Mo-99 8.65-2 Mn-54 5.16-4 Te-132 1.09-2 Mn Cs-134 4.01+0 Fe-59 6.06-4 Cs-136 1.02+0 Co-58 1.54-2 Cs-137 2.03+1 Co-60 5.16-4 Ba-140 1.50-3 La-140 1.71-3 Sr-89 2.31-3 Ce-144 2.87-4 Sr-90 1.21-4 I-131 5.51-1 Sr I-132 1.12-2 Y-90 1.22-4 I-133 8.28-5 Y-91 3.47-3 I-134 -

Y I-135 -

Zr-95 3.93-4 Nb-95m 3.76-4

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes. Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-18 Revision:

Sheet: 8 1 of 1 TABLE 12.2-18 GEOMETRY OF EQUIPMENT IN SPENT FUEL POOL CLEANUP SYSTEM Spent Fuel Pool Demineralizer Diameter 48.0 in. Height 72.0 in. Volume 75.0 ft 3 Spent Fuel Pool Demineralizer Prefilter And Spent Fuel Pool Demineralizer Postfilter Diameter 7 in. Height 28 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-19 Revision:

Sheet: 10 1 of 2 TABLE 12.2-19 SOURCE TERMS FOR MISCELLANEOUS CHEMICAL DRAIN SYSTEM [HISTORICAL] System Input:

Isotope Ci/gm Isotope Ci/gm I-131 1.1(-l) Cr-51 4.2(-5) Mo-99 1.5(-l) Mn-54 3.5(-5) Te-132 1.1(-2) Co-58 1.1(-3) I-132 4.0(-2) Fe-59 4.8(-5) Cs-134 1.9(-2) Co-60 3.4(-5) Cs-136 9.7(-3) Cs-137 9.7(-2) Sr-89 1.8(-4) Ba-140 2.0(-4) Sr-90 7.9(-6) La-140 6.2(-5) Y-90 9.7(-6) Ce-144 1.9(-5)

Y-91 2.6(-4) Zr-95 2.9(-5) Nb-95 3.0(-5) Note: Short-lived Isotopes (T1/2 <l day) are neglected unless they are the daughter of a long-lived isotope. 1. Chemical Drain Tank Isotope Ci Ci/gm Isotope Ci Ci/gm Cr-51 1.4(-4) 3.7(-5) Mo-99 2.1(-l) 5.6(-2) Mn-54 1.3(-4) 3.5(-5) I-131 2.8E(-l) 7.5(-2) Co-58 4.0(-3) 1.0(-3) Te-132 1.8(-2) 4.6(-3) Fe-59 1.7(-4) 4.4(-5) I-132 2.0(-2) 5.2(-3) Co-60 1.3(-4) 3.4(-5) Cs-134 7.1(-2) 1.9(-2) Cs-136 2.9(-2) 7.6(-3) Sr-89 6.4(-4) 1.7(-4) Cs-137 3.7(-l) 9.7(-2)

Sr-90 3.0(-5) 7.9(-6) Ba-140 5.9(-4) 1.6(-4) Y-90 3.2(-5) 8.5(-6) La-140 5.2(-4) 1.4(-4)

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-19 Revision:

Sheet: 10 2 of 2 Y-91 9.3(-4) 2.4(-4) Ce-144 7.1(-5) 1.9(-5) Zr-95 1.0(-4) 2.7(-5) Nb-95 1.1(-4) 3.0(-5) Total 1.0(+0) 2.6(-l)

2. Chemical Drain Transfer Pump See specific source term for Chemical Drain

Tank 3. Chemical Drain Treatment Tank and Chemical Drain Treatment Pump Isotope Ci Ci/gm Isotope Ci Ci/gm Cr-51 3.5(-4) 2.4(-5) Mo-99 8.7(-2) 5.9(-3) Mn-54 4.9(-4) 3.3(-5) I-131 3.3(-1) 2.2(-2) Co-58 1.2(-2) 8.3(-4) Te-132 8.4(-3) 5.7(-4) Fe-59 4.9(-4) 3.3(-5) I-132 8.7(-3) 5.9(-4) Co-60 5.0(-4) 3.4(-5) Cs-134 2.8(-l) 1.9(-2) Cs-136 4.8(-2) 3.3(-3) Sr-89 2.0(-3) 1.3(-4) Cs-137 1.4(+0) 9.7(-2) Sr-90 1.2(-4) 7.9(-6) Ba-140 1.0(-3) 6.8(-5) Y-90 1.2(-4) 7.9(-6) La-140 1.1(-3) 7.5(-5)

Y-91 2.9(-3) 1.9(-4) Ce-144 2.7(-4) 1.8(-5) Zr-95 3.3(-4) 2.2(-5) Nb-95 4.1(-4) 2.8(-5) Total 2.2(+0) 1.5(-l) Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-20 Revision:

Sheet: 8 1 of 1 TABLE 12.2-20 EQUIPMENT GEOMETRY FOR THE MISCELLANEOUS CHEMICAL DRAIN SYSTEM Chemical Drain Tank Diameter 5 ft Height 8 ft 8 in. Chemical Drain Transfer Pump Diameter 8 in. Length 2 in. Chemical Drain Treatment Tank Diameter 8 ft Height 10 ft 9 in. Chemical Drain Treatment Pump Diameter 6 in. Length 2 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-21 Revision:

Sheet: 10 1 of 1 TABLE 12.2-21 MAXIMUM EXPECTED RADIONUCLIDE CONTENT OF A REACTOR MAKEUP WATER STORAGE TANK [HISTORICAL]

Radionuclide Tank Inventory (Curies) Radionuclide Tank Inventory (Curies) I-131 1.1-1 Mo-99 2.2+0 1-132 3.8-2 Cs-134 1.1-1 I-133 1.7-1 Cs-136 5.9-2 I-134 2.3-2 Cs-137 5.5-1 I-135 9.3-2 Te-132 1.1-2 Ba-140 5.9-3 Sr-89 1.6-3 La-140 1.4-5 Sr-90 5.5-5 Ce-144 1.4-5 Sr-91 8.1-4 Y-90 6.4-5 Mn-54 3.3-5 Y-91 2.5-3 Mn-56 1.2-3 Y-92 3.1-4 Co-58 1.1-3 Zr-95 3.0-5 Co-60 3.1-5 Nb-95 2.9-5 Fe-59 4.2-5 Cr-51 3.9-5 TOTAL = 3.4 Curies

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-22 Revision:

Sheet: 10 1 of 1 TABLE 12.2-22 MAXIMUM EXPECTED RADIONUCLIDE CONTENT OF A REFUELING WATER STORAG E TANK [HISTORICAL]

Radionuclide Tank Inventory (Curies) Radionuclide Tank Inventory (Curies) I-131 7.7+1 Mo-99 6.0+0 I-132 <1.0-7 Cs-134 4.2+1 I-133 7.4-5 Cs-136 8.0+0 I-134 <1.0-7 Cs-137 2.2+2 I-135 1.0-7 Te-132 6.3-1 Ba-140 7.8-2 Sr-89 4.8-1 La-140 1.4-5 Sr-90 2.2-2 Ce-144 5.2-2 Sr-91 <1.0-7 Y-90 1.4-4 Mn-54 1.2-1 Y-91 7.8-1 Mn-56 <1.0-7 Y-92 <1.0-7 Co-58 3.4+0 Zr-95 9.5-2 Co-60 1.2-1 Nb-95 7.7-2 Fe-59 1.2-1 Cr-51 9.3-2 TOTAL = 359 Curies

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-23 Revision:

Sheet: 8 1 of 1 TABLE 12.2-23 GEOMETRY OF WATER STORAGE TANKS Reactor Makeup Water Storage Tank Diameter 26 ft Height 29 ft 3 in. Refueling Water Storage Tank Diameter 44 ft Height 43 ft S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-24 Revision:

Sheet: 10 1 of 3 TABLE 12.2-24 LIQUID WASTE SYSTEM SOURCE TERMS [HISTORICAL]

Isotope Feed (Ci/gm) Floor Drain Tank (Ci) Floor Drain Tank Pump (Ci/gm) Waste Evap Bottom (Ci) Waste Evap Distillate (Ci/cc) Distillate Condensa te (Ci/gm) Waste Test Tank (Ci) Waste Test Tank Concentrati on (Ci/gm) Waste Demin. (Ci) Evap. Bottom Pump (Ci/gm) Cr-51 7.1(-5) 2.7(-3) 9.5(-5) 3.8(-2) 8.3(-12) 7.1(-9) 6.7(-7) 7.1(-9) 3.0(-6) 6.7(-3) Mn-54 5.9(-5) 2.2(-3) 7.9(-5) 3.3(-2) 6.8(-12) 5.8(-9) 5.5(-7) 5.8(-9) 1.3(-5) 5.8(-3)

Mn-56 (1) Co-58 2.0(-3) 7.6(-2) 2.6(-3) 1.1(+0) 2.3(-10) 2.0(-7) 1.9(-5) 2.0(-7) 2.0(-4) 1.9(-1) Fe-59 8.3(-5) 3.1(-3) 1.1(-4) 4.5(-2) 9.6(-12) 8.2(-9) 7.7(-7) 8.1(-9) 5.5(-6) 7.9(-3) Co-60 5.8(-5) 2.2(-3) 7.7(-5) 3.3(-2) 6.8(-12) 5.8(-9) 5.5(-7) 5.8(-9) 1.7(-5) 5.8(-3) Sr-89 3.1(-4) 1.2(-2) 4.1(-4) 1.8(-1) 3.7(-11) 3.2(-8) 3.0(-6) 3.2(-8) 2.4(-5) 3.2(-2) Sr-90 1.4(-5) 5.3(-4) 1.8(-5) 8.0(-3) 1.6(-12) 1.4(-9) 1.3(-7) 1.4(-9) 4.2(-6) 1.4(-3) Y-90 1.7(-5) 5.3(-4) 1.8(-5) 8.0(-3) 1.6(-12) 1.7(-9) 1.3(-7) 1.4(-9) 4.2(-6) 1.6(-3)

Sr-91(1) Y-91 4.4(-4) 1.7(-2) 5.8(-4) 2.5(-1) 5.3(-11) 4.5(-8) 4.3(-6) 4.5(-8) 3.9(-5) 4.4(-2)

Y-92(1) Zr-95 5.0(-5) 1.9(-3) 6.7(-5) 2.8(-2) 5.8(-12) 5.0(-9) 4.7(-7) 5.0(-9) 4.7(-6) 4.9(-3)

(1) Those isotopes with half-life less than one day are negl ected unless they are decay products of long-lived isotopes (2) For the above decay product, parent activities are used for source term assuming secular equilibrium is achieved.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-24 Revision:

Sheet: 10 2 of 3 Isotope Feed (Ci/gm) Floor Drain Tank (Ci) Floor Drain Tank Pump (Ci/gm) Waste Evap Bottom (Ci) Waste Evap Distillate (Ci/cc) Distillate Condensa te (Ci/gm) Waste Test Tank (Ci) Waste Test Tank Concentrati on (Ci/gm) Waste Demin. (Ci) Evap. Bottom Pump (Ci/gm) Nb-95 5.1(-5) 1.9(-3) 6.8(-5) 2.8(-2) 5.8(-12) 5.0(-9) 4.7(-7) 5.0(-9) 7.1(-6) 4.9(-3) Mo-99 2.5(-1) 9.4(+0) 3.3(-1) 8.8(+1) 2.9(-8) 2.5(-5) 2.2(-3) 2.3(-5) 9.6(-4) 1.5(+1) I-131 1.9(-1) 7.2(+0) 2.5(-1) 9.1(+1) 2.2(-7) 1.9(-4) 1.7(-2) 1.8(-4) 2.2(-2) 1.6(+1) Te-132 2.0(-2) 7.5(-1) 2.6(-2) 7.5(+0) 2.3(-9) 2.0(-6) 1.8(-4) 1.9(-6) 9.3(-5) 1.3(+0) I-132 6.8(-2) 7.5(-1) 2.6(-2) 7.5(+0) 6.8(-8) 5.8(-5) 1.8(-4) 1.9(-6) 9.3(-5) 1.5(+1)

I-133(1)

I-134(1) Cs-134 3.3(-2) 1.3(+0) 4.4(-2) 1.9(+1) 4.0(-9) 3.4(-6) 3.2(-4) 3.4(-6) 9.1(-3) 3.3(+0)

I-135(1) Cs-136 1.7(-2) 6.4(-1) 2.2(-2) 8.7(+0) 2.0(-9) 1.7(-6) 1.6(-4) 1.7(-6) 3.3(-4) 1.5(+0) Cs-137 1.7(-1) 6.5(+0) 2.2(-1) 9.7(+1) 2.0(-8) 1.7(-5) 1.6(-3) 1.7(-5) 5.1(-2) 1.7(+1) Ba-140 3.4(-4) 1.3(-2) 4.5(-4) 1.7(-1) 4.0(-11) 3.4(-8) 3.2(-6) 3.4(-8) 6.5(-6) 3.0(-2) La-140 1.7(-4) 4.3(-3) 1.4(-4) 1.2(-1) 1.3(-11) 1.1(-8) 1.3(-6) 1.4(-8) 6.9(-6) 2.1(-2) Ce-144 3.3(-5) 1.3(-3) 4.4(-5) 1.9(-2) 4.0(-12) 3.4(-9) 3.2(-7) 3.4(-9) 7.4(-6) 3.3(-3) Xe-131m 4.0(-12)

Xe-133m 1.3(-10)

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-24 Revision:

Sheet: 10 3 of 3 Isotope Feed (Ci/gm) Floor Drain Tank (Ci) Floor Drain Tank Pump (Ci/gm) Waste Evap Bottom (Ci) Waste Evap Distillate (Ci/cc) Distillate Condensa te (Ci/gm) Waste Test Tank (Ci) Waste Test Tank Concentrati on (Ci/gm) Waste Demin. (Ci) Evap. Bottom Pump (Ci/gm) Xe-133 2.3(-9) Xe-135m 1.8(-7) Xe-135 1.2(-8) TOTAL 2.7(+1) 9.2(-1) 3.2(+2) 5.4(-7) 3.0(-4) 2.2(-2) 2.3(-4) 8.4(-2) 6.9(+1)

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumption s and methodology described in Section 12.2 used for the original shieldi ng design and is retained here for historical purposes. Upd ating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor change in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-25 Revision:

Sheet: 8 1 of 3 TABLE 12.2-25 GEOMETRY OF EQUIPMENT IN THE LIQUID WASTE SYSTEM Floor Drain Tank Diameter 11 ft Height 15 ft 1 in.

Floor Drain Tank Pumps Diameter 2 in. Height 13 in. Waste Evaporator Lower Part Upper Part Vapor Space Diameter 2 ft 6 in.

5 ft 6 in.

5 ft 6 in.

Height 13 ft 6 in.

3 ft 3 in.

8 ft 9 in. Waste Evaporator Distillate Condenser Diameter 2 ft 2 in.

Height 6 ft Waste Evaporator Distillate Accumulator Diameter 2 ft 2 in.

Height 11 ft Waste Evaporator Distillate Pump Diameter 2 in. Height 13 in. Waste Evaporator Distillate Cooler Diameter 1 ft 9 in.

Height 10 ft S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-25 Revision:

Sheet: 8 2 of 3 Waste Test Tank (WTT)

Diameter 11 ft Height 35 ft WTT Pumps Diameter 2 in. Height 13 in. Waste Demineralizer Diameter 4 ft Height 6 ft Waste Evaporator Reboiler Diameter 36 in. Height 14 ft Volume Source Fluid 31 ft 3 Waste Evaporator Reboiler Pump Volume 20 ft 3 Diameter 24 in. Waste Evaporator Bottoms Pump Diameter 2 in. Height 13 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-25 Revision:

Sheet: 8 3 of 3 Waste Evaporator Bottoms Cooler Straight Section (Qty-12)

Length 10 ft Diameter 1 in. Volume of Source Fluid 150 in. Curved Section (Qty-11) Diameter 1 in. Radius of Curve 4 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-26 Revision:

Sheet: 10 1 of 1 TABLE 12.2-26 RADIONUCLIDE CONCENTRATIONS IN WASTE GAS STREAMS

[HISTORICAL]

Concentration (Ci/cc) ISOTOPE LTDN DEGASIFIER PDT DEGASIFIER RGWS INPUT Kr-83m 2.4+1*

• 2.4+1* 2.4+1* Kr-85m 1.0+2 1.0+2 1.0+2 Kr-85 8.4+0 8.4+0 8.4+0 Kr-87 6.6+1 6.6+1 6.6+1 Kr-88 2.0+2 1.0+2 1.0+2 Xe-131m 4.3+0 4.3+0 4.3+0 Xe-133m 3.6+1 3.6+1 3.6+1 Xe-133 1.6+3 1.6+3 1.6+3 Xe-135m 2.4+1 2.4+1 2.4+1 Xe-135 1.9+2 1.9+2 1.9+2 Xe-137 1.8+0 1.8+0 1.8+0 Xe-138 1.9+1 1.9+1 1.9+1 I-131 1.2-1 1.2+0 4.8-1 I-132 3.8-2 3.8-1 1.5-1 I-133 1.9-1 1.9+0 7.6-1 I-134 2.0-2 2.0-1 8.0-2 I-135 1.0-1 1.0+0 4.0-1 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

• 2.4+1 = 2.4x10 1

SEABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-27 Revision:

Sheet: 10 1 of 2 TABLE 12.2-27 RADIOACTIVE SOURCE TERMS FOR GAS WASTE SYSTEM

[HISTORICAL]

Radionuclide Inventory

• (Ci) Isotope Filter I-Guard Bed Chiller Dryer H 2 Surge Tank Hepa Kr-83m 6.0-3 5.5-2 5.0 - Kr-85m 2.5-2 2.3-1 2.1+0 - - Kr-85 2.1-3 1.9-2 1.7-1 1.4+2 2.3+0 Kr-87 1.7-2 1.5-1 1.4+0 - - Kr-88 4.5-2 4.4-1 4.0+0 - - Xe-131m 1.1-3 9.9-3 9.0-2 2.2+0 7.9-1 Xe-133m 9.0-3 8.2-2 7.5 - Xe-133 4.0-1 3.8+0 3.4+1 1.1+1 5.8+0 Xe-135m 6.0-3 5.5-2 5.0 - Xe-135 4.8-2 4.4-1 4.0+0 - - Xe-137 4.5-4 4.1-3 3.7 - Xe-138 4.8-3 4.4-2 4.0 - I-131 4.5+1 2.7-4 2.5 -

I-132 1.7-1 8.5-5 7.8 -

I-133 7.8+0 4.4-4 4.0 -

I-134 3.3-2 4.4-5 4.0 -

I-135 1.3+0 2.3-4 2.1 - Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

• Source Terms apply to a single component.

SEABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-27 Revision:

Sheet: 10 2 of 2 Radionuclide Inventory (Ci)

Isotope 1st Bed 2nd Bed 3rd Bed 4th Bed 5th Bed Kr-83m 8.2+1 1.5-1 -- -- -- Kr-85m 7.5+2 5.2+1 3.5+0 2.4-1 1.7-2 Kr-85 1.8+2 1.8+2 1.8+2 1.8+2 1.8+2 Kr-87 1.5+2 1.4-2 <1.0-2 -- --

Kr-88 1.0+3 1.5+1 2.2-1 <1.0-2 -- Xe-131m 1.1+3 5.7+2 2.8+2 1.4+2 7.0+1 Xe-133m 3.5+3 8.8+1 2.2+0 5.6-2 <1.0-2 Xe-133 3.0+5 6.1+4 1.3+4 2.6+3 5.4+2 Xe-135m 1.2+1 -- -- -- --

Xe-135 3.2+3 -- -- -- --

Xe-137 2.1-1 -- -- -- --

Xe-138 8.3+0 -- -- -- -- I-131 1.6+2 1.0+1 6.4-1 4.0-2 <1.0-2 I-132 5.9-1 3.7-2 <1.0-2 -- --

I-133 2.7+1 1.7+0 1.1-1 <1.0-2 --

I-134 1.2-1 <1.0-2 -- -- --

I-135 4.6+0 2.9-1 1.8-2 <1.0-2 --

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-28 Revision:

Sheet: 8 1 of 1 TABLE 12.2-28 GEOMETRY OF EQUIPMENT IN RADIOACTIVE WASTE GAS SYSTEM Waste Gas Chiller Diameter 3 in. Length 34 in. Waste Gas Dryer Diameter 6 in. Height 53 in. Iodine Guard Bed Diameter 2 3/4 in. Height 13 in. Carbon Delay Bed Diameter 36 in. Height 72 in. Hydrogen Surge Tank Diameter 36 in. Height 72 in. Regenerative Compressor Diameter 24 in. Height 6 in. Gas Volume 85 in.3 HEPA Filter Diameter 2 3/4 in. Height 111/2 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-29 Revision:

Sheet: 10 1 of 2 TABLE 12.2-29 SHIELDING SOURCE TERMS FOR EQUIPMENT IN SOLID WASTE MANAGEMENT SYSTEM [HISTORICAL]

Nuclide Shielding Source Terms (Ci/gm) (a) (b)(c)(d) (e)I -131 1.2+01

• 1.0+016.5+022.2+03 3.5+01I -132 4.7-01 4.1-012.9+019.7+01 1.4+00 S r -89 3.0-02 2.6-034.9+001.6+01 8.8-02 S r -90 2.0-03 1.7-031.1+003.7+00 5.8-03Y -90 2.1-03 1.8-031.1+003.7+00 6.1-03Y -91 4.4-02 3.8-021.1+003.7+00 1.3-01 Z r -95 5.3-03 4.6-031.3+004.3+00 1.5-02Nb -95 6.7-03 5.8-037.1-012.4+00 2.0-02Mo -99 5.4+00 4.7+007.1+012.4+02 1.6+01Cs -134 5.9+00 5.1+002.6+028.7+02 1.7+01 Cs -136 1.1+00 9.5-019.2+003.1+01 3.2+00 Cs -137 3.2+00 2.8+001.5+025.0+02 9.3+00 Te -132 4.7-01 4.1-012.9+019.7+01 1.4+00Ba -140 1.6-02 1.4-021.7+005.7+00 4.7-02La -140 1.4-02 1.2-021.7+005.7+00 4.1-02Ce -144 4.4-03 3.8-032.0+006.7+00 1.3-02Mn -54 8.0-03 6.9-033.6+001.2+01 2.3-02Co -58 2.1-01 1.8-015.4+011.8+02 6.1-01 Co -60 8.5-03 7.4-034.6+001.5+01 2.5-02Fe -59 7.5-03 6.5-031.5+005.0+00 2.2-02

C r -51 5.3-03 4.6-038.1-012.7+00 1.5-02

(a) Waste Concentrates Tank and Waste Conc. Transfer Pump (b) Waste Feed Tanks and Waste Feed Recir. Pump (c) Spent Resin Transfer Pump, Spent Resin Hopper, Spent Resin Recir. Pump, and Resin Centrifuge Metering Pump (d) Spent Resin Centrifuge (e) Waste Crystallizer/Evaporator, Crystallizer Recir. Pump, and Crystallizer Drain Pump

• 1.2+01 = 1.2x10 1

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-29 Revision:

Sheet: 10 2 of 2 Nuclide Shielding Source Terms (Ci/gm) (f) (g)(h)(i) (j)I -131 3.5+01 1.0-041.6-011.0-04 1.1+03I -132 1.4+00 3.9-067.3-033.9-06 4.9+01 S r -89 8.8-02 2.5-071.3-032.5-07 8.0+00 S r -90 5.8-03 1.7-082.7-041.7-08 1.9+00Y -90 6.1-03 1.8-082.7-041.8-08 1.9+00Y -91 1.3-01 3.7-072.7-043.7-07 1.9+00 Z r -95 1.5-02 4.4-083.3-044.4-08 2.2+00Nb -95 2.0-02 5.6-081.8-045.6-08 1.2+00Mo -99 1.6+01 4.5-051.8-024.5-05 1.2+02Cs -134 1.7+01 4.9-056.5-024.9-05 4.4+02Cs -136 3.2+00 9.2-062.4-039.2-06 1.6+01Cs -137 9.3+00 2.7-053.7-022.7-05 2.5+02Te -132 1.4+00 3.9-067.3-033.9-06 4.9+01Ba -140 4.7-02 1.3-074.3-041.3-07 2.9+00La -140 4.1-02 1.2-074.3-041.2-07 2.9+00Ce -144 1.3-02 3.7-085.0-043.7-08 3.4+00Mn -54 2.3-02 6.7-089.0-046.7-08 6.0+00Co -58 6.1-01 1.8-061.4-021.8-06 9.0+01Co -60 2.5-02 7.1-081.2-037.1-08 7.5+00Fe -59 2.2-02 6.3-083.8-046.3-08 2.5+00 C r -51 1.5-02 4.4-082.1-044.4-08 1.4+00 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

(f) Conc. Bottom Tank, Conc. Bottom Tank Recir. Pump, Waste Metering Pump, and Alternate Station Conc. Feed Pump (g) Entrainment Separator, Crystallizer Condenser (Shell Side), Crystallizer Dist. Tank, Crystallizer Dist. Pump, and Crystallizer Subcooler (Shell Side) (h) Spent Resin Dewatering Pump (i) Crystallizer Reflux Pot and Crystallizer Reflux Pump (j) Extruder S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-30 Revision:

Sheet: 8 1 of 4 TABLE 12.2-30 GEOMETRY OF EQUIPMEN T IN SOLID WASTE MANAGEMENT SYSTEM Waste Concentrates Tank Diameter 10 ft Height 11 ft 9 in. Waste Concentrates Transfer Pump Diameter (internal) 4 in. Length 17 in. Waste Feed Tank(s)

Diameter 5 ft Height (including heads) 9 ft 10 in. Waste Feed Recirculation Pump(s)

Diameter (internal) 2 in. Length 1 ft 6 in. Spent Resin Transfer Pump Diameter (internal) 2 in. Length 6 ft Spent Resin Hopper Diameter 5 ft Height (cylinder) 6 ft Height (cone) 3 ft S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-30 Revision:

Sheet: 8 2 of 4 Spent Resin Recirculation Pump Diameter 3 in. Length 3 ft 9 in. Resin Centrifuge Metering Pump Diameter (internal) 2 in. Length 1 ft 9 in.

Spent Resin Centrifuge Diameter of bowl 1 ft Depth of bowl 1 ft 3 in.

Evaporator/Crystallizer Vapor Body Diameter 3 ft Height (cylinder) 9 ft 6 in.

Height (cone) 2 ft 9 in. Crystallizer Recirculation Pump Diameter (internal) 10 in. Length 6 ft Crystallizer Drain Pump Diameter (internal) 10 in. Length 3 ft Concentrates Bottom Tank Diameter 5 ft Height 8 ft 6 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-30 Revision:

Sheet: 8 3 of 4 Concentrates Bottom Tank Recirculation Pump Diameter (internal) 10 in. Length 3 ft 6 in. Waste Metering Pump Diameter (internal) 3/4 in. Length 1 ft 6 in. Alternate Station Concentrates Feed Pump Diameter (internal) 20 in. Length 4 ft 6 in. Entrainment Separator Diameter 2 ft Height (including heads) 12 ft 6 in.

Crystallizer Condenser Diameter 13 in. Height 11 ft 6 in.

Crystallizer Subcooler Diameter 6 in. Height 11 ft 6 in. Spent Resin Dewatering Pump Diameter (internal) 1 in. Length 1 ft 3 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-30 Revision:

Sheet: 8 4 of 4 Crystallizer Reflux Pot Diameter 1 ft 6 in.

Height (head to head) 29 in. Crystallizer Reflux Pump Diameter (internal) 1 in. Length 1 ft Evaporator/Extruder Diameter (internal) 2 in. Length 15 ft 9 in.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-31 Revision:

Sheet: 10 1 of 1 TABLE 12.2-31 CONTAINMENT AIRBORNE ISOTOPIC CONCENTRATIONS AT SHUTDOWN [HISTORICAL] Volume = 2.70x10 6 ft 3 Ventilation Rate = 1000 cfm, continuous prior to shutdown Isotope Specific Activity (Ci/cc) MPC Fraction H -3 4.02-04

• 8.03+01 Kr -85m 3.09-06 5.15-01 Kr -85 2.65-06 2.65-01 Kr -87 7.30-07 7.30-01 Kr -88 4.01-06 4.01+00 Xe -131m 9.22-06 6.08-02 Xe -133m 6.19-06 6.19-01 Xe -133 3.76-04 3.76+01 Xe -135m 1.82-06 1.82+00 Xe -135 1.55-05 3.88+00 Xe -138 7.63-08 7.62-02 I -131 4.11-08 4.57+00 I -132 8.98-10 4.49-03 I -133 2.55-09 8.51-02 I -134 2.30-10 4.61-04 I -135 5.77-09 5.76-02 TOTAL 8.13-04 1.35+02 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

• 4.02-04 = 4.02x10

-4 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-32 Revision:

Sheet: 10 1 of 1 TABLE 12.2-32 CONTAINMENT AIRBORNE ISOTOPIC CONCENTRATIONS 20 HOURS AFTER SHUTDOWN [HISTORICAL] Volume = 2.70x10 6 ft 3 Ventilation Rate = 1000 cfm, continuous prior to shutdown Ventilation Rate = 11,000 cfm, for 17 hours1.967593e-4 days <br />0.00472 hours <br />2.810847e-5 weeks <br />6.4685e-6 months <br /> following shutdown, then 40,000 cfm, after 17 hours1.967593e-4 days <br />0.00472 hours <br />2.810847e-5 weeks <br />6.4685e-6 months <br /> following shutdown Recirculation Rate = 4000 cfm, for 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />, with 90% removal of iodine species Isotope Specific Activity (Ci/cc) MPC Fraction H -3 3.41-06*6.81-01 K r -85 m 1.12-09 1.87-04 K r -85 2.25-08 2.25-03 K r -87 1.09-13 1.09-07 K r -88 2.36-10 2.36-04 Xe -131 m 1.02-08 2.53-05 Xe -133 m 4.10-10 4.10-03 Xe -133 2.87-06 2.87-01 Xe -135 m 4.48-08 4.48-02 Xe -135 6.75-08 1.69-02 Xe -138 0.

0. I -131 1.33-10 1.47-02 I -132 7.19-15 3.60-08 I -133 4.54-12 1.52-04 I -134 0.

0. I -135 2.53-12 2.53-05 TOTAL 6.43-06 1.05+00 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

• 3.41-06 = 3.41x10

-6 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-33 Revision:

Sheet: 10 1 of 1 TABLE 12.2-33 TURBINE BUILDING AIRBORNE ISOTOPIC CONCENTRATIONS -

SUMMER [HISTORICAL] Volume = 7.72x10 6 ft 3 Ventilation Rate = 1.00x10 6 cfm Isotope Specific Activity (Ci/cc)MPC Fraction Kr -85m 1.26-13* 2.11-08 Kr -85 9.74-15 9.73-10 Kr -87 8.91-14 8.90-08 Kr -88 2.43-13 2.43-07 Xe -131m 5.07-15 2.53-10 Xe -133m 4.15-14 4.15-09 Xe -133 1.88-12 1.88-07 Xe -135m 7.78-14 7.79-08 Xe -135 2.35-13 5.87-08 Xe -138 3.59-14 3.59-08 I -131 1.04-12 1.15-04 I -132 6.79-14 3.39-07 I -133 1.16-12 3.87-05 I -134 1.67-14 3.31-08 I -135 3.70-13 3.70-06 TOTAL 5.41-12 1.59-04 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

• 1.26-13 = 1.26x10-13 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-34 Revision:

Sheet: 10 1 of 1 TABLE 12.2-34 TURBINE BUILDING AIRBORNE ISOTOPIC CONCENTRATIONS -

WINTER [HISTORICAL] Volume = 7.18x10 6 ft 3 Ventilation Rate = 0 cfm Isotope Specific Activity (Ci/cc) MPC Fraction Kr -85m 4.82-12* 8.03-07 Kr -85 1.72-10 1.72-05 Kr -87 1.04-12 1.04-06 Kr -88 5.95-12 5.96-06 Xe -131m 2.24-11 1.12-06 Xe -133m 2.40-11 2.39-06 Xe -133 2.24-09 2.24-04 Xe -135m 6.55-12 6.54-06 Xe -135 3.96-11 9.89-06 Xe -138 1.03-13 1.08-07 I -131 1.70-09 1.89-01 I -132 1.38-12 6.88-06 I -133 2.05-13 6.84-03 I -134 1.38-13 2.77-07 I -135 2.13-11 2.13-04 TOTAL 4.44-09 1.96-01 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

• 4.82-12 = 4.82x10-12 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-35 Revision:

Sheet: 10 1 of 1 TABLE 12.2-35 PRIMARY AUXILIARY BUILDING AIRBORNE ISOTOPIC CONCENTRATIONS [HISTORICAL] Volume = 1.45x10 5 ft 3 Ventilation Rate = 41,500 cfm Isotope Specific Activity (Ci/cc) MPC Fraction Kr -85m 2.61-08

• 4.35-03 Kr -85 2.03-09 2.03-04 Kr -87 1.92-08 1.92-02 Kr -88 5.12-08 5.12-02 Xe -131m 1.04-09 5.22-05 Xe -133m 8.60-09 8.59-04 Xe -133 3.87-07 3.87-02 Xe -135m 1.24-08 1.24-02 Xe -135 4.80-08 1.20-02 Xe -138 8.89-09 8.89-03 I -131 2.90-10 3.23-02 I -132 1.03-10 5.17-04 I -133 4.60-11 1.53-03 I -134 6.48-11 1.30-04 I -135 2.51-10 2.51-03 TOTAL 5.65-07 1.85-01 Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

• 2.61-08 = 2.61x10

-8 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-36 Revision:

Sheet: 10 1 of 1 TABLE 12.2-36 REFUELING AIRBORNE TRITIUM CONCENTRATION CONTAINMENT REFUELING POOL [HISTORICAL] Volume = 2.70x10 6 ft 3 Ventilation Rate = 40,000 cfm Isotope Specific Activity (Ci/cc) MPC Fraction H -3 1.62-06 3.25-01

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.2-37 Revision:

Sheet: 10 1 of 1 TABLE 12.2-37 REFUELING AIRBORNE TRITIUM CONCENTRATION SPENT FUEL POOL [HISTORICAL] Volume = 263,000 ft 3 Ventilation Rate = 34,000 cfm Isotope Specific Activity (Ci/cc) MPC Fraction H -3 2.67-06 5.35-01

Note: The information presented in the above Table represents the radiation sources and associated input parameters, assumptions and methodology described in Section 12.2 used for the original shielding design and is retained here for historical purposes.

Updating this analysis using an analyzed reactor power of 3659 MWt and operation with an 18-month fuel cycle represents a minor ch ange in the original design basis and will have no significant impact on shielding requirements and safe plant operations.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-1 Revision:

Sheet: 8 1 of 1 TABLE 12.3-1 RADIATION ZONI NG AND ACCESS CONTROL Zone Dose Rate Mrem/Hour Allowed Occupancy I Less than 0.5 No Restriction on Access II 0.5 - 2.5 Occupational Access III 2.5 - 15 Periodic Access IV 15 - 100 Limited Access V Greater than 100 Restricted Access

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-2 Revision:

Sheet: 8 1 of 1 TABLE 12.3-2 RADIATION ZONE AREAS Location Maximum Dose Rate (mrem/hr) Normal Operation Site Boundary 0.0005 Reactor Building Interior During Operation (Below Elev. 25'-0") (Above Elev. 25'-0")

15 150 Certain Equipment Areas in Auxiliary Building 15 Fuel Handling Areas 15 Auxiliary Building Corridors, Cable Room, Local Control Panels, Equipment Room, Containment Operating Floor

During Shutdown

2.5 Control

Room

0.5 Turbine

Building

0.5 Administration

Building

0.5 Radiation

Counting Room

0.5 Accident

Condition Inside Control Room following DBA 5 rem integrated whole body dose over duration of accident

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-3 Revision:

Sheet: 8 1 of 1 TABLE 12.3-3 COMPONENT SHIELDING THICKNESS Reference Figure: 12.3-1 Bldg: Containment Elevation: (-) 26'-0" CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT

NORTH EAST SOUTH WEST CEILING FLOOR Reactor Coolant Drain Tank Excess Letdown Heat Exchanger Regenerative Heat Exchanger Reactor Coolant Drain Tank Heat Exch.

18 48 36 12 36 42 36 12 24 30 36 12 48 32 36 36 24 24 24* 24 - - - -

• Plus 4 inches of lead plate S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-4 Revision:

Sheet: 8 1 of 1 TABLE 12.3-4 COMPONENT SHIELDING THICKNESS Reference Figure: 12.3-4 Bldg: Vaults Elevation: (-) 61'-0" & above CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT NORTH EAST SOUTH WEST CEILING FLOOR RHR Heat Exch. - A RHR Pump - A

RHR Heat Exch. - B RHR Pump - B 48 48 30 30 30 30 30 30 30 30 36 48 30 30 30 30 30 24 30 30 48 30 48 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-5 Revision:

Sheet: 8 1 of 1 TABLE 12.3-5 COMPONENT SHIELDING THICKNESS Reference Figure: 12.3-5 Bldg: PAB Elevation: 2'-0" CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT NORTH EAST SOUTH WEST CEILING FLOOR BTR Demin - A BTR Demin - B, C BTR Demin - D, E Cation Demin Mixed Bed Demins Spent Fuel Pool Demin

Letdown Heat Exch.

Letdown Reheat Hx

Letdown Chiller Hx

Moderating Heat Exch Seal Water Hx Seal Water Return Fltr

Seal Injection Filter

Reactor Coolant Fltr Demin Pre-Filter

Fuel Pool Post-Filter

Fuel Pool Pre-Filter 36 24 24 24 36 36 30 24 24 24 24 24 24 24 24 24 24 36 36 30 42 42 30 24 24 24 24 24 24 24 24 24 24 24 24 24 24 36 36 30 24 24 24 24 24 24 24 24 24 24 24 24 24 24 30 36 24 30 30 36 36 24 24 24 36 36 24 24 48 48 48 48 48 48 36 36 36 36 36 36 36 36 36 36 36 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-6 Revision:

Sheet: 8 1 of 1 TABLE 12.3-6 COMPONENT SHIELDING THICKNESS Reference Figure: 12.3-5 Bldg: PAB Elevation: 7'-0" CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT NORTH EAST SOUTH WEST CEILING FLOOR Cent. Charging Pump

- A Cent. Charging Pump

- B Recip. Charging Pump

Letdown Degasifier (Liquid) Letdown Degasifier Pumps 33 24 24 30 30 24 24 24 30 24 24 24 30 30 30 0 (15)* 0 (15) 0 (15) 24 30 36 36 36 -- 24 36 36 36 48 48

• (n) - Denotes "n" feet of air available for additional shielding.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-7 Revision:

Sheet: 8 1 of 1 TABLE 12.3-7 COMPONENT SHIELDING THICKNESS Reference Figure: 12.3-6 Bldg: PAB Elevation: 25'-0" CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT NORTH EAST SOUTH WEST CEILING FLOOR Letdown Degasifier (Vapor) Sample Heat Exch's 42 36 48 24 42 24 42 24 30 48 -- 24 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-8 Revision:

Sheet: 8 1 of 1 TABLE 12.3-8 COMPONENT SHIELDING THICKNESS Reference Figure: 12.3-7 Bldg: PAB Elevation: 53'-0" CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT

NORTH EAST SOUTH WEST CEILING FLOOR Volume Control Tank 48 48 48 48 48 48 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-9 Revision:

Sheet: 8 1 of 1 TABLE 12.3-9 COMPONENT SHIELDING THICKNESS Reference Figure: 12.3-8 Bldg: WPB Elevation: (-)31'-0" COMPONENT

CONCRETE SHIELD THICKNESS (IN)

WALLS CEILING FLOOR NORTH EAST SOUTH WEST Resin Sluice Tanks Resin Transfer Pump

Floor Drain Tanks

Floor Drain Tank Pumps Waste Concentrates Tank Waste Concentrates Transfer Pump Chemical Drain Treatment Transfer Pump Chemical Drain Treatment Tanks 36 30 36 36 30 24 24 24 36 24 24 12 30 30 30 30 30 36 30 30 24 24 24 24 42 42 42 24 30 24 0 (10)* 30 30 24 24 21 24 24 30 24 48 48 48 48 48 48 48 48

• (n) - Denotes "n" feet of air available for additional shielding S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-10 Revision:

Sheet: 8 1 of 2 TABLE 12.3-10 COMPONENT SHIELDING THICKNESS Reference Figure: 12.3-9 Bldg: WPB Elevation: (-)3'-0" CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT NORTH EAST SOUTH WEST CEILING FLOOR Cesium Removal Ion Exchanger - A 36 30 24 36 30 30 Cesium Removal Ion

Exchanger - B 24 30 24 36 30 30 Recovery Demineralizers 24 30 24 30 30 30 Waste Demineralizer 24 30 24 30 30 30 Recovery Filter - A 36 30 24 24 30 30 Recovery Filter - B 24 30 24 24 30 30 Recovery Evaporator

Filter - A 24 30 24 24 30 30 Recovery Evaporator

Filter - B 24 30 66 24 30 30 Recovery Demineralizer

Filter - A 66 30 24 24 30 30 Recovery Demineralizer

Filter - B 24 30 24 24 30 30 Floor Drain Filter - A 24 30 24 24 30 30 Floor Drain Filter - B 24 30 66 24 30 30 Waste Demineralizer

Filter 66 30 24 24 30 30 Primary Drain Tank Degasifier Filter 24 30 48 24 30 30 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-10 Revision:

Sheet: 8 2 of 2 CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT NORTH EAST SOUTH WEST CEILING FLOOR Resin Sluice Filter 30 24 12 36 24 24 Primary Drain Tanks 36 24 30 36 30 30 Primary Drain Tank Transfer Pumps 36 18 30 24 21 21 Primary Drain Tank

Degasifier Recirc Pumps 24 24 0(7)* 48 24 24 Waste Evaporator

Reboiler 12 24 24 24 24 24 Waste Evaporator Bottoms Package 24 24 12 24 24 24 Boron Waste Storage

Tank - A 30 24 24 30 24 24 Boron Waste Storage

Tank - B 30 30 24 24 24 24 Recovery Evaporator Feed Pumps 24 24 24 24 24 24 Recovery Evaporator

Reboilers 12 24 24 24 24 24 Recovery Evaporator Bottoms Packages 24 24 12 24 24 24

• (n) - Denotes "n" feet of air available for additional shielding S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-11 Revision:

Sheet: 8 1 of 1 TABLE 12.3-11 COMPONENT SHIELDING THICKNESS Reference Figure: 12.3-10 Bldg: WPB Elevation: 25'-0" CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT NORTH EAST SOUTH WEST CEILING FLOOR Primary Drain Tank

Degasifier (Lower

Half) Primary Drain Tank Degasifier (Upper

Half) Refueling Water Storage Tank 24 24 24 24 24 24 34 36 24 42 42 24 --

36 -- 24

-- --

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-12 Revision:

Sheet: 8 1 of 1 TABLE 12.3-12 COMPONENT SHIELDING THICKNESS Reference Figure: 12.3-11 Bldg: WPB Elevation: 42'-5" CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT NORTH EAST SOUTH WEST CEILING FLOOR Crystallizer Recirc. Pump Crystallizer Drain Pump Crystallizer Reflux Pump Evaporator/Extruder 18 18 18

• 12 12 12 30 30 30 30 18 30 30 30 18 24 24 24 24 24 24 24 18/24

• 2" lead brick (as needed)

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-13 Revision:

Sheet: 8 1 of 2 TABLE 12.3-13 COMPONENT SHIELDING THICKNESS Reference Figure: 12.3-12, 12.3-13 Bldg: WPB Elevation: 53'-0" CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT NORTH EAST SOUTH WEST CEILING FLOOR Waste Hopper 36 36 36 30 30 30 Waste Gas Chiller-Dryer 24 36 24 24 24* 24 Carbon Delay Bed - A 48 36 36 36 36 36 Carbon Delay Bed - B 48 48 48 36 36 36 Carbon Delay Beds -

C,D,E 42 30 30 30 30 24 Hydrogen Surge Tank 42 30 30 30 30 24 Iodine Guard Beds 24 36 36 36 30 24 Waste Feed Tanks 30 30 30 36 12 24 Waste Feed Recirc.

Pumps 30 30 12 36 12 24 Spent Resin Recirc.

Pump 36 30 30 36 12 24 Resin Centrifuge Metering Pump 24 36 18 12 12 24 Spent Resin Centrifuge 12 12 12 24 12 24 Evaporator/Crystallizer Vapor Body 12 30 30 24 15 24 Concentrates Bottom Tank 30 30 30 36 12 24 Concentrates Bottom Tank Recirc. Pump 30 30 12 36 12 24

• Plus 1" Steel Plate S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-13 Revision:

Sheet: 8 2 of 2 CONCRETE SHIELD THICKNESS (IN) WALLS COMPONENT NORTH EAST SOUTH WEST CEILING FLOOR Waste Metering Pump 24 36 18 12 12 24 Alternate Station Concentrates Feed Pump 30 30 12 36 12 24 Entrainment Separator 12 30 30 24 15 24 Crystallizer Condenser 30 30 12 36 12 24 Crystallizer Subcooler 30 30 12 36 12 24 Spent Resin Dewatering Pump 36 30 30 36 12 24 Crystallizer Reflux Pot 12 30 30 24 15 24 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-14 Revision:

Sheet: 8 1 of 3 TABLE 12.3-14 AREA RADIATION MONITORS INSTRUMENT TAG NO. RE- DESCRIPTION DETECTORTYPE DETECTOR BACK- GRD. mr/hr RANGE LOW-HIGH mr/hr (Note 5)ALARM SET POINT mr/hr DETECTOR QTY. IEEE CLASS UPDATED FSAR FIGURE REFERENCE Containment Structure 6534 In-Core Instrument Seal Table GM (Note 4) 15 10-1-10 4 1 Non 1E 12.3-2 6535A, B (Note 1) Manipulator Crane GM (Note 4) 15 10-1-10 4 2 1E 12.3-3 6536-1, 2 Personnel Hatch (Post-LOCA)

Ion Chamber 2.5 10+1-10 9 2 Non 1E 12.3-3 6529 Cavity Beneath Reactor Vessel Ion Chamber 3x10 6 (Note 3) 10+1-10 7 1 Non 1E 12.3-1 6576A, B Containment (Post-LOCA) Ion Chamber 25 10 0-10 8 r/hr 2 1E 12.3-3 Primary Auxiliary Building 6537 Sampling Room GM 2.5 10-1-10 4 1 Non 1E 12.3-6 6538, 6539 RHR Pump Area GM >100 10-1-10 4 2 Non 1E 12.3-4 6540 Volume Control Tank Area Ion Chamber 8x10 4 10 1-10 7 1 Non 1E 12.3-7 6541 Lower Level GM 2.5 10-1-10 4 1 Non 1E 12.3-5 6543 Entrance GM >100 10-1-10 4 1 Non 1E 12.3-5 6544 Entrance GM 2.5 10-1-10 4 1 Non 1E 12.3-6 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-14 Revision:

Sheet: 8 2 of 3 INSTRUMENT TAG NO. RE- DESCRIPTION DETECTORTYPE DETECTOR BACK- GRD. mr/hr RANGE LOW-HIGH mr/hr (Note 5)ALARM SET POINT mr/hr DETECTOR QTY. IEEE CLASS UPDATED FSAR FIGURE REFERENCE 6545, 6546 6547 Charging Pump Room GM 110 10-1-10 4 3 Non 1E 12.3-5 6508-1,2 PAB-HRAM Ion Chamber

>100 10-2-10 4 r/hr 2 Non 1E 12.3-5 6563-1,2 PAB-HRAM Ion Chamber

>100 10-2-10 4 r/hr 2 Non 1E 12.3-5 6517-1,2 RHR - Pump Vault HRAM Ion Chamber

>100 10-2-10 4 r/hr 2 Non 1E Fuel Storage Building 6549 Spent Fuel Pool Area GM 2.5 10-1-10 4 1 Non 1E 12.3-15 6518 Spent Fuel - HRAM Ion Chamber 2.5 10-2-10 4 r/hr 1 Non 1E 12.3-15 Control Room 6550 Main Control Board Area GM 0.5 10-1-10 4 1 Non 1E 1.2-32 Waste Processing Building 6551 Waste Gas Processing Area GM 2.5 10-1-10 4 1 Non 1E 12.3-11 6552 Truck Loading Area GM 1.5 10-1-10 4 1 Non 1E 12.3-10 6553 Radwaste Control Room GM 0.5 10-1-10 4 1 Non 1E 12.3-10 6554 Waste Management Control GM 5 10-1-10 4 1 Non 1E 12.3-10 Panel Area S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-14 Revision:

Sheet: 8 3 of 3 INSTRUMENT TAG NO. RE- DESCRIPTION DETECTORTYPE DETECTOR BACK- GRD. mr/hr RANGE LOW-HIGH mr/hr (Note 5)ALARM SET POINT mr/hr DETECTOR QTY. IEEE CLASS UPDATED FSAR FIGURE REFERENCE GM (Note 6) 1 1E 12.3-10 Mnifold Area 1 1E 6570 Extruder/Evaporator 10 0-10 5 Non a 6571 Compacted Rad Waste Storage Area GM 2.5 10-1-10 4 Non 12.3-10 Administration & Service Building 1 1E Room GM 0.5 1 1E 1 1E 1 1E 1 1E 6555 Hot Chemistry Laboratory GM 0.5 10-1-10 4 Non 12.3-16 6556 Decontamination 10-1-10 4 Non 12.3-16 6557 RCA Shop (Note 2)

GM 0.5 10-1-10 4 Non 12.3-16 6558 RCA Personnel Decontamination Area GM 0.5 10-1-10 4 Non 12.3-16 6559 RCA Women's Locker Room GM 0.5 10-1-10 4 Non 12.3-16 (Note 1) 6535-A and 6535-B will automatically terminate containment purge in the event of high radiation dur ing fuel handling operations. (Note 2) RCA - Radiologically Controlled Area. (Note 3) Background 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> after shutdown 200 mr/hr.

(Note 4) GM - Geiger-Mueller.

(Note 5) Radiation monitoring setpoints are varied during operation to follow station conditions. Setpoints are maintained within the bounds established in the Technical Specifications. The methodology for establishing the setpoints is found in the station operating procedures. (Note 6) >100 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-15 Revision:

Sheet: 12 1 of 2 TABLE 12.3-15 AIRBORNE RADIATION MO NITORS (SKID MOUNTED DETECTORS) INSTRUMENT TAG NO. RE- DESCRIPTION DETECTOR TYPE REFERENCE ISOTOPE DETECTORBACK- GRD. mr/hr RANGE LOW-HIGHCi/cc (Note 5) ALARM SET POINT Ci/cc DETECTORQTY. IEEE CLASS ENERGY LEVEL LOOP DIAG. 1-NHY P&ID 1-NHY 6526-1 Containment Air Particulate (Note 4) Beta I 131 , Cs 137 2.5 10-10-10-6 1 Non 1E Note 3 506135 20504 6526-2 Containment Radiogas Beta Xe 133 2.5 10-6-10-2 1 Non 1E Note 1 506135 20504 6528-1 Plant Vent - WRGM (Low Range) Beta Xe 133, Kr 85 2.5 10-7-10-1 1 Non 1E Note 1 506607 20494 6528-2 Plant Vent - WRGM (Mid Range) Beta Xe 133, Kr 85 2.5 10-3-10 3 1 Non 1E Note 1 506607 20494 6528-3 Plant Vent - WRGM (Hi Range) Beta Xe 133, Kr 85 2.5 10-1-10 5 1 Non 1E Note 1 506607 20494 6495 WRGM Backup Ion Chamber Xe 133, Kr 85 2.5 10-1-107 mr/hr 1 Non 1E Note 1 506607 RM-20509 6531-1 WPB Air Particulate Beta I 131 , Cs 137 2.5 10-11-10-7 1 Non 1E Note 3 506885 20498 6531-2 WPB Radiogas Beta Xe 133 2.5 10-7-10-3 1 Non 1E Note 1 506885 20498 6532-1 PAB Air Particulate Beta I 131 , Cs 137 2.5 10-11-10-7 1 Non 1E Note 2 506598 20510 6532-2 PAB Radiogas Beta Xe 133 2.5 10-7-10-3 1 Non 1E Note 1 506598 20510 6548 Containment Beta Xe 133 2.5 10-6-10-2 1 Non 1E Note 1 506136 RM20510 Radiogas Backup Administration

& Service Building 6522-1 Air Particulate Beta I 131 , Cs 137 0.5 10-12-10-8 1 Non 1E Note 2 506669 20509 6522-2 Radiogas Beta Xe 133 0.5 10-7-10-3 1 Non 1E Note 1 506669 20509

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-15 Revision:

Sheet: 12 2 of 2 NOTES Note Isotopes Max. Beta Energy (Mev)

Predominant Gamma Energy (Mev)

Xe 133 0.346 0.081 Xe 135 0.92 0.249 Kr 85 0.67 0.514 1 Kr85m 0.82 0.150 I 131 0.606 0.364 I 133 1.27 0.53 Cs134 0.662 0.604 Cs137 0.514 0.662 Co 58 0.474 0.81 2 Co 60 0.314 1.17, 1.33 3 Same as Note 2, plus:

Rb 88 5.3 1.863 4 Containment air particulate monitor functions as a leakage detector and must survive the SSE (reference Regulatory Guide 1.45 and Standard Review Plan 5.2.5).

5 Radiation monitoring setpoints are varied during operation to follow station operating conditions. Setpoints are maintained within the bounds established in the Technical Specifications. The methodology for establishing the setpoints is found in the station operating procedures.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.3-16 Revision:

Sheet: 8 1 of 1 TABLE 12.3-16 AIRBORNE RADIATION MONITO RS (DETECTORS MOUNTED IN DUCT)

INSTRUMENT TAG NO. RE- DESCRIPTION DETECTORTYPE BACK-GRD. mr/hr RANGE LOW-HIGH CPM (Note 1) ALARMSET POINT CPM DETECTOR QTY. IEEE CLASS LOOP DIAG.

P&ID LOCATION 9763-F- 6506A1, A2, B1, B2 (1 RM)

CTL Rm East Air Intake GM 0.5 10 1-10 6 1E 506151 NHY-CBA- 20303 500210 6507A1, A2, B1, B2, (1 RM)

CTL Rm West Air Intake GM 0.5 10 1-10 6 8 1E 506152 NHY-CBA- 20303 500210 Administration Building 6523 Fume Hood Exh FN-115 GM 0.5 10 1-10 6 1 Non 1E 506668 NHY-AAH-20004 615002 & 11 6524 Fume Hood Exh FN-116 GM 0.5 10 1-10 6 1 Non 1E 506668 NHY-AAH-20004 615002 & 11 6525 Fume Hood Exh FN-117 GM 0.5 10 1-10 6 1 Non 1E 506668 NHY-AAH-20004 615002 & 11 Fuel Storage Building 6562 FAH-Fuel Stor Bldg Exh GM 0.5 10 1-10 6 1 Non 1E 506452 NHY-MAH-20497 500178 500332 Containment Enclosure 6566 EAH-Contn Encl Emerg Exh GM 0.5 10 1-10 6 1 Non 1E 506602 NHY-MAH-20495 500179 Primary Auxiliary Building 6567 PAB-Misc Ventilation GM 2.5 10 1-10 6 1 Non 1E 506603 NHY-MAH-20494 500175 & 8 6568 PAB-Contn Enclosure GM 2.5 10 1-10 6 1 Non 1E 506596 NHY-MAH-20494 500175 & 8

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.4-1 Revision:

Sheet: 8 1 of 1 TABLE 12.4-1 ESTIMATED AVERAGE ANNUAL DOSE OF SEABROOK PERSONNEL Activity Total Dose (Man-Rem) Percent of Total Dose Reactor Operations and Surveillance 35.0 9 Routine Maintenance 63.0 17 In-Service Inspection 42.0 11 Special Maintenance 164.0 44 Waste Processing 28.0 8 Refueling 39.84 11 _____ _________

371.84 100 percent S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.4-2 Revision:

Sheet: 8 1 of 1 TABLE 12.4-2 OCCUPATIONAL DOSE ESTIMATES DURING ROUTINE OPERATIONS AND SURVEILLANCE Activity Radiation Field (R/Hr) Exposure Time (Hrs/Year)

(6) Total Dose (Manrems/Year)

Walking In Radiation Zones 0.0005 (1) 10,000 5.0 Control Room 0.0001 (2) 25,000 2.5 Routine Surveillance Inside Containment 0.05 (3) 100 5.0 Health Physics Surveys 0.0025 (4) 3,600 9.0 Collection of Radioactive & Water Chemistry Samples 0.0025 (4) 1,460 3.65 Radiochemistry Analysis 0.0012 (5) 2,500 3.00 Routine Surveillance Primary Auxiliary Building 0.001 (2) 3,000 3.00 Routine Surveillance Fuel Storage Building 0.005 (2) 750 3.75 Miscellaneous 0.00 34.9 Information Sources

(1) The estimated occupancies of the different radiation zones provided in Table 12.3-1 indicate that approximately 75 percent of the total manhours of o ccupancy will be in Radiation Zone I areas. The average field was taken to be equal to the design maximum for Zone I areas. Since the average field in the Zone I areas is expected to be 20 percent or less of the design value, this conservatism takes into account the 25 percent of total time personnel spend in the radiation zones with more intense fields (II, III, and IV). (2) Average fields assumed to be 20 percent of the maximum design fields for these areas. Radiation zones and justification for this assumption provided in Section 12.3. (3) Estimated field consistent with other FSARs and the projected design range of exposures for these areas at Seabrook Station. (4) Estimated occupancies of radiation zones by work function in Table 12.3-1 indicate that the majority of time spent in radiation zones by chemistry and health physics personnel is in Zone II areas. Therefore, the average exposure is conservatively assumed equal to the design maximum for Zone II. (5) Information in appendix of "Technology Planning Study of Occupational Radiation Exposure in LWR Nuclear Power Plants," Electric Power Research Institute, January 33, 1980 (Reference 6) indicates that exposure for this activity is approximately half that generally encountered in the health physics surveys. (6) Exposure time estimates based on engineering judgment.

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.4-3 Revision:

Sheet: 8 1 of 2 TABLE 12.4-3 OCCUPATIONAL DOSE ESTIMATES DURING ROUTINE MAINTENANCE Activity Radiation (1) Field (R/Hr) Exposure (2) Time (Hours/Year)

Total Dose (3) (Man-Rems/Year)

Polar Crane Maintenance 0.005 160 0.8 Check & Repair Snubbers 0.015 200 3.0 Reactor Coolant Pump Motor Work 0.100 60 6.0 Pressurizer Work 0.005 60 0.3 Containment Pressure Test & Valve Repair Containment Instrument Calibration 0.050 50 2.5 Repair Containment Sump Pumps & Level Indicators 0.050 50 2.5 Replace Excore Detectors 0.050 90 4.5 Repair Dampers & Ducts 0.005 120 0.6 Primary Aux, Bldg.

Valve Repair 0.010 200 2.0 Instrument Work &

Calibration 0.005 800 4.0 Gen. Maintenance 0.005 1000 5.0 Filter, Ion Exchanger

& Demineralizer Repair 0.150 40 6.0 Radwaste Evaporator Repair 0.150 40 6.0 General Decon. & Revamping 0.015 750 11.0 Remove/Replace Filters For Containment Cleanup 0.100 12 1.2 Radwaste Bldg. General Maintenance 0.100 40 4.0 Boron Recovery Evaporator Repair 0.100 40 4.0 Miscellaneous 0.00 _____ 63.4 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.4-3 Revision:

Sheet: 8 2 of 2 Information Sources

(1) Exposure rates for these activities assumed to be comparable to exposure rates for similar types of activities reported in "Radiation Exposure Management - The Westinghouse ALARA Program," J. D. Cohen and J. R. Magaw (Reference 7); and "Study of the Effects of Reduced Occupational Radiation Exposure Limits on the Commercial Nuclear Power Industry," Atomic Industrial Forum, Inc.

Abstracts of both papers appear in the preliminary draft of "Technology Planning Study of Occupational Radiation Exposure in LWR Nuclear Power Plants," Electric Power Research Institute, January 22, 1980 (Reference 6). (2) Estimate of total exposure time based on engineering judgment. (3) Total annual exposures consistent with historical data for similar activities reported in "Compilation and Analysis of Data on Occupational Radiation Exposure Experienced at Operating Nuclear Power Plants" (Reference 1).

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.4-4 Revision:

Sheet: 8 1 of 2 TABLE 12.4-4 OCCUPATIONAL DOSE ESTI MATE - REFUELING OPERATIONS Activity Radiation Field (Rem/Hr) Exposure Time (Man-Hrs) Total Dose (Man-Rem) Move, Setup, Check Fuel Transfer Equip.

0.1-0.005 32 0.62 Remove Seismic Supports 0.025 8 0.20 Disconnect CRDM & DRPI Cables 0.025 28 0.70 Remove RV Head Insulation 0.1 20 2.00 Remove Transfer Tube Quick Closure Hatch 0.1 See Miscellaneous Retract In-Core Thimbles 0.005 20 0.10 Connect RV Head Eductor 0.1 2 0.20 Lower Stud Tensioners Racks to Cavity 0.005-0.025 12 0.15 Relax RV Studs 0.05 30 1.50 Remove RV Studs 0.05 21 1.05 Install Stud Hole Plugs 0.05 9 0.45 Install RV Guide Studs 0.05 12 0.60 Install Permanent Cavity Seal Ring Hatches 0.05 2 0.1 Install Head Lift Rig Load Cell 0.1 6 0.60 Remove RV Head 0.005-1 8 0.21 Disconnect Control Rod Drive Shafts 0.1 9 0.90 Remove Upper Internals 0.005-0.1 16 0.27 Index Refueling Crane 0.005 4 0.02 Shuffle Fuel 0.005 960 4.80 Map Fuel Core Locations 0.005 15 0.07 Clean, Inspect UT Studs, Nuts &

Tensioners 0.005 60 0.30 Install New RV Head O Rings 0.5 4 2.00 Install Upper Internals 0.005-0.1 12 0.25 S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.4-4 Revision:

Sheet: 8 2 of 2 Activity Radiation Field (Rem/Hr) Exposure Time (Man-Hrs) Total Dose (Man-Rem)

Latch Control Rod Drive Shafts 0.1 9 0.90 Drain Cavity

-- 3 -- Clean Vessel Flange Surface 0.5 10 5.00 Install In-Core Thimbles 0.005 20 0.10 Install RV Head Lifting Rig 0.005-0.5 14 0.80 Cavity Decontamination 0.025 96 2.40 Remove Stud Hole Plugs 0.05 16 0.80 Clean Stud Holes 0.05 16 0.80 Install RV Head Studs 0.05 54 2.70 Tension RV Head Studs 0.05 105 5.25 Install Transfer Quick Closure Hatch 0.1 See miscellaneous Flood Cavity

-- 3 -- Connect CRDM & DPRI Cables 0.025 28 0.70 Remove Permanent Cavity Seal Ring Hatches 0.05 2 0.1 Install RV Head Insulation 0.1 20 2.00 Install Seismic Supports 0.025 8 0.20 Miscellaneous

• 1.00 _____ TOTAL 39.84

• Includes the removal and installation of the transfer tube quick closure hatchInformation Source:"Radiation Exposure Management - The Westinghouse ALARA Program," J. D. Cohen and J. R. Magaw of Westinghouse Nuclear Energy Systems (Reference 7); paper presented at the International Radiation Protection Conference, Paris, December 1979. The abstract of this paper appeared in the preliminary draft of "Technology Planning Study of Occupational Radiation Exposure in LWR Nuclear Power Plants," which was prepared for the Electric Power Research Institute by Stone & Webster Engin eering Corporation, January 22, 1980 (Reference 6).

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.4-5 Revision:

Sheet: 8 1 of 1 TABLE 12.4-5 OCCUPATIONAL DOSE ESTIMATES DURING WASTE PROCESSING Activity Average Dose Rate (Mrem/Hr) Exposure(3) Time Per Event (Man Hours)

Frequency Dose (Man-Rem/Year) Control Room Panel 0.5(1) 8 3/day 4.37 Sampling & Filter Changing 15.0(2) 16 1/week 12.48(4) Panel Operation, Inspection & Testing 0.5(1) 2 1/day 0.37 Operation of Waste

Processing and Packaging Equipment 5.0(2) 40 1/week 10.4(4) Miscellaneous 0.00 ______ Total 27.60

(1) Average dose rate assumed to be 20 percent of the maximum design dose rate for the radiation zone in which the equipment is located. Radiation zones and justification for this assumption provided in Table 12.3-1. (2) Average dose rate for these activities assumed to be equal to the maximum design dose rate for the radiation zone in which the equipment is located. (3) Exposure time estimates based on engineering judgment. (4) Total annual exposure for the activity consistent with historical data reported in "Compilation and Analysis of Data on Occupational Radiation Exposure," (Reference 1).

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.4-6 Revision:

Sheet: 8 1 of 1 TABLE 12.4-6 OCCUPATIONAL DOSE ESTIMATES DURING IN-SERVICE INSPECTION Activity Radiation (1) Field (R/Hr) Exposure (2) Time (Hrs/Year)

Total Dose (3) (Man-Rem/Year)

Erect/Remove Scaffolding 0.02 50 1.0 Remove/Replace Insulation 0.05 100 5.0 Remove/Replace Primary Manway Covers 0.02 125 2.5 Remove/Replace Secondary Manway Covers 0.005 80 0.4 Complete Steam Generator Tube

Inspection 0.12 125 15.0 Steam Generator Secondary Side 0.01 50 0.5 Reactor Coolant Pumps 0.01 50 0.5 Reactor Vessel 0.01 80 0.8 Makeup Pumps 0.005 80 0.4 Pressurizer 0.005 40 0.2 Containment Piping 0.15 60 9.0 Reactor Vessel Internals 0.05 140 7.0 ______ Total 42.3 Information Sources

(1) Exposure rates for these activities assumed to be comparable to exposure rates for similar types of activities reported in "Radiation Exposure Management - The Westinghouse ALARA Program," J. D. Cohen and J. R. Magaw, and "Study of the Effects of Reduced Occupational Radiation Exposure Limits on the Commercial Nuclear Power Industry," Atomic Industrial Forum, Inc. Abstracts of both papers appear in the preliminary draft of "Technology Planning Study of Occupational Radiation Exposure in LWR Nuclear Power Plants," Electric Power Research Institute, January 22, 1980. (2) Estimate of total exposure time based on engineering judgment. (3) Total annual exposures consistent with historical data for similar activities reported in "Compilation and Analysis of Data on Occ upational Radiation Exposure Experienced at Operating Nuclear Power Plants" (Reference 1).

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.4-7 Revision:

Sheet: 8 1 of 1 TABLE 12.4-7 OCCUPATIONAL DOSE ESTIMATES DURING SPECIAL MAINTENANCE Activity Radiation Field (Rem/Hr) Exposure Time (Man-Hrs) Total Dose (Man-Rem) Residual Heat Removal Pump Maintenance 0.200 (1) 60 12.00 Reactor Coolant Pump Maintenance 0.100 (1) 150 15.00 Steam Generator Maintenance and

Tube Plugging 0.150 (1) 360 54.00 Steam Generator - Eddy Current

Testing 0.125 (1) 240 30.00 Block Valve Maintenance 0.250 (1) 72 18.00 Water Lancing 0.125 (2) 120 15.00 Misc Pipe Repair 0.100 (2) 50 5.00 Replace Upper Guide Structure on

Control Rods 0.125 (2) 120 15.00 Miscellaneous 0.00 Total 164.00 Information Sources:

(1) "Study of the Effects of Reduced Occupational Radiation Exposure Limits on the Commercial Nuclear Power Industry," (to be published) prepared for Atomic Industrial Forum, Inc., by Catalytic, Inc., (1979-1980) (Reference 8). The abstract of this paper appeared in the preliminary draft of "Technology Planning Study of Occupational Radiation Exposure in LWR Nuclear Power Plants" which was prepared for the Electric Power Research Institute by Stone & Webster, Engineering Corporation, January 22, 1980. (Reference 6). (2) Exposure rates for these activities assumed to be the same as for similar types of activities reported in Reference 1. (3) Average total annual exposures for these activities obtained from "Compilation and Analysis of Data on Occupational Radi ation Exposure Experienced at Operating Nuclear Power Plants," Atomic Industrial Forum, Inc., September 1974 (Reference 1); and material appended to the preliminary draft of "Technology Planning Study of Occupational Radiation Exposure in LWR Nuclear Power Plants," Electric Power Research Institute, January 22, 1980 (Reference 6).

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.5-1 Revision:

Sheet: 8 1 of 1 TABLE 12.5-1 PORTABLE HEALTH PHYSICS INSTRUMENTATION Quantity Calibration Type of Instrument Minimum Sensitivity Range Method Frequency Ion Chamber (Low Range) 16 Beta, Gamma 0 to 1 R/hr.

Source Semiannual Ion Chamber (Mid Range) 8 Gamma 0 to 50 R/hr.

Source Semiannual Ion Chamber (High Range) 4 Gamma Up to 10,000 R/hr. As recommended by manufacturer Geiger Mueller Detector 6 Beta, Gamma 0 to 50,000 cpm Source and Pulse Generator Semiannual 10 Beta, Gamma 0 to 200 mR/hr Source Alpha Scintillation or Proportional Detector 4 Alpha 0 to 500,000 cpm Source Semiannual Telescoping Survey 4 Gamma 0 to 1,000 R/hr.

Source Semiannual Instrument Neutron Dose Rate Detector 3 Neutron 0.001 to 5 rem/hr As recommended by manufacturer Air Sampler (Low Volume) 10 Particulate and Iodine -- Flow Rate Semiannual Air Sampler (High Volume) 6 Particulate and Iodine -- Flow Rate Semiannual Air Sampler (Personnel) 10 Particulate -- Flow Rate Semiannual Continuous Air Monitor 4 Particulate and Noble Gas Monitor and Iodine Sampler -- Flow Rate and Response Semiannual

S EABROOK S TATION UFSAR R ADIATION PROTECTION TABLE 12.5-2 Revision:

Sheet: 10 1 of 1 TABLE 12.5-2 PERSONNEL MONITORING INSTRUMENTS Type of Detector Minimum Quantity Sensitivity Range Hand held frisker 24 Beta, Gamma 0 to 5x10 4 cpm 2 Beta or Gamma Portal Monitor or large area detection device Variable Alarm

Setpoint Self-reading dosimeter

Note 1 No Min. Required Gamma Multiple ranges available TLD 750 Station Use Beta, Gamma, Neutron Meets industry

Standards 250 Emergency Beta, Gamma Whole body counter 1 Gamma Meets industry Standards Electronic Dosimeters 300 Gamma Meets industry Standards Note 1: The Station has transitioned to use of electronics dosimeters. SRPDs are available for use; however, they are not maintained calibrated. Calibration would be performed prior to use.

S EABROOK S TATION U PDATED F INAL S AFETY A NALYSIS R EPORT C HAPTER 12 RADIATION PROTECTION F IGURES Radiation Zone Map - Containment Structure - Plan at Elevation (-) 26'-

0" S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-1 See 805184

Radiation Zone Map - Containment Structure - Plan at Elevation 0'-0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-2 See 1-NHY-805185

Radiation Zone Map - Containment Structure - Plan at Elevation 25'-0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-3 See 805186

Radiation Zone Map - RHR, Containment Spray, SI Equipment Vault Plans S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-4 See 805187

Radiation Zone Map - Primary Auxiliary Building - Plans at Elevation 7'-0 and Below S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-5 See 805188

Radiation Zone Map - Primary Auxiliary Building - Plans at Elevation 25'-0" S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-6 See 805189

Radiation Zone Map - Primary Auxiliary Building - Plans at Elevation 53'-0 And 81 '-0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-7 See 805190

Radiation Zone Map - Waste Processing Building - Plans at Elevations (-) 31'-0, (-) 18'-3 and 13'-0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-8 See 805896

Radiation Zone Map - Waste Processing Building - Plan at Elevation (-) 3-0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-9 See 805891

Radiation Zone Map - Waste Processing Building - Plan at Elevation 25'-

0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-10 See 1-NHY-805892

Radiation Zone Map - Waste Processing Building - Plans at Elevations 42'-5 And 65 '-0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-11 See 1-NHY-805897

Radiation Zone Map - Waste Processing Building - Plan at Elevation 53'-

0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-12 See 1-NHY-805893

Radiation Zone Map - Waste Processing Building - Partial Plans at Elevation 53'-0 And 9 '-0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-13 See 1-NHY-805894

Radiation Zone Map - Waste Processing Building - Plan at Elevation 86'-0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-14 See 805895

Radiation Zone Map - Fuel Storage Building - Plan at Elevations 21'-6 And 25 '-0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-15 See 805181

Radiation Zone Map - Fuel Storage Building - Plan at Elevations 7'-0 And 10 '-0 S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-16 See 805182

RCA Boundary - Administration and Service Building - First Floor Plan at Elevation 21' S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-17 See 1-NHY-805183

Normal Exhaust Unit - Primary Auxiliary Building S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12-3-18

Area Radiation Monitors System - Instrumentation Engineering Diagram S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-19 Sh. 1 of 2 See 1-NHY-500017 Sh. 1 Area Radiation Monitors System - Instrumentation Engineering Diagram S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-19 Sh. 2 of 2 See 1-NHY-500017 Sh. 2

Airborne Radiation Monitoring System - Instrumentation Engineering Diagram S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-20 Sh. 1 of 2 See 1-NHY-500016 Sh. 1 Airborne Radiation Monitoring System - Instrumentation Engineering Diagram S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.3-20 Sh. 2 of 2 See 1-NHY-500016 Sh. 2

Deleted S EABROOK S TATION UPDATED F INAL SAFETY ANALYSIS R EPORT Figure 12.5-1 Figure 12.5-1 Deleted