ML20023A811
| ML20023A811 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 10/12/1982 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Vandewalle D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| Shared Package | |
| ML20023A812 | List: |
| References | |
| CON-NRC-03-79-118, CON-NRC-3-79-118, TASK-09-05, TASK-9-5, TASK-RR LSO5-82-10-030, LSO5-82-10-30, NUDOCS 8210200041 | |
| Download: ML20023A811 (9) | |
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'~~ i October 12, 1982 Docket No. 50-155 LS05-82 030 Nr. David J. VandeWalle Nuclear Licensing Adninistrator Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201
Dear Mr. VandeWalle:
SUBJECT:
SEP TOPIC IX-5, VENTILATION SYSTEMS BIG ROCK POINT Enclosed is a copy of a Safety Evaluation Report of Systenatic Evaluation Progran Topic IX-5, Ventilation Systens. This evaluation is based on our contractor's, The Franklin Research Center, Technical Evaluation Report (TER-C5257-414), and your June 11, 1982 topic assessment.
This evaluation will be a basic input to the Integrated Safety Assessment for your facility. A determination of the need to actually inplement nodifications will be nade during the Integrated Assessment. This topic assessment may be revised in the future if your facility design is changed or if NRC criteria relating to this topic is nodified before the Integrated Assessment is completed.
Sincerely, Dennis'M. Crutchfield, Chief Operating Reactors Branch f5 Division of Licensing 1
Enclosure:
l As stated cc w/ enclosure:
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Mr. David J. VandeWalle CC Hr. Paul A. Perry, Secretary U. S. Environmental Protection Consumers Power Company Agency
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212 West Michigan Avenue Federal Activities Branch Jackson, Michigan 49201 Region V Office ATTH:
Regional Radiation Representative Judd L. Bacon, Esquire 230 South Dearborn Street Consumers Power Company Chicago, Illinois 60604 212 West Michigan Avenue
" Jackson, Michigan 49201 Peter B. Bloch, Chaiman Atomic Safety and Licensing Board Joseph Gallo, Esquire U. S. Nuclear Regulatory Commission Isham, Lincoln & Beale Washington, D. C.
20555 1120 Connecticut Avenue Room 325 Dr. Oscar H. Paris Washington, D. C.
20036 Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Peter W. Steketee, Esquire Washington, D. C.
20555 505 Peoples Building Grand Rapids, Michigan 49503 Mr. Frederick J. Shon Atomic Safety and Licensing Board Alan S. Rosenthal, Esq., Chairman U. S. NQclear Regulatory Commission
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Atomic Safety & Licensing Appeal Board Washington, D. C.
20555 U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Sig Rod Point Nuclear Power P1: ant ATTN: A C. J. Hartman e
Mr. John O'Neill,11 PTant Superintendent Route 2, Box 44 Charlevoix, Michigan 49720 Maple City, Michigan 49664 Christa-Maria
~ Mr.~ Jim E. Mills Route 2, Box 108C Route 2, Box 108C Charlevoix, Michigan 49720 Charlevoix, Michigan 49720 William J. Scanlon, Esquire Chairman 2034 Pauline Boulevard County Board of Supervisors Ann Arbor, Michigan 48103 Charlevoix County Charlevoix, Michigan 49720 Resident Inspector 3
Big Rock Point Plant
~ 'f fice of the Governor (2) c/o U.S. NRC'
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Room 1 - Capitol Building RR #3, Box 600
_ Lansing, Michigan 48913 Charlevoix, Michigan 49720
' Herbert Semmel Hurst & Hanson Counsel for Christa Maria, et al.
311 1/2 E. Mitchell y
Urban Law Institute Petoskey, Michigan 49770 Antioch School of Law 2633 16th Street, NW j
Washing'.on, D. C.
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s Mr. David J. VandeWalle cc Dr. John H. Buck Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Ms. JoAnn Bier 204 Clinton Street Charlevoix, Michigan 49720 Thomas S. Moore Atomic Safety and Licensing Appeal Board
. U. 5. Nuclear Regulatory Commissiun Washington, D. C.
20555 James G. Keppler, Regional Administrator Nuclear Regulatory Commission, Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 e
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TOPIC IX-5 SEP REVIEW VENTILATION SYSTEMS FOR THE BIG ROCK POINT NUCLEAR POWER PLANS t
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I.
INTRODUCTION To assure that the ventilation systems have the capability to provide
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a safe environment for plant personnel and for engineered safety 1
features, it is necessary to review the design and operation of these systems. For example, the function of the spent fuel pool area ventila-tion system is to provide ventilation in the spent fuel pool equipment areas, to permit pesonnel access, and to control airborne radioactivity in the area during normal operation, anticipated operational transients, and following postulated fuel handling accidents. The function of the engineered safety feature ventilation system is to provide a suitable and controlled environment for engineered safety feature components following certain anticipated transients and design basis accidents.
II.
REVIEW CRITERIA The current licensing criteria are identified in Sec^ ion 2 of FRC report TER-C5257-414, " Review of the Design and Operation of Ventila-tion Systems for SEP Plants - Big Rock Point."
III. RELATED SAFETY TOPICS AND INTERFACES The scope of review for this topic was limited to avoid duplication of effort since some aspects of the review were performed under related topics. The related topics and the subject matter are identified in Section 3 of FRC report TER-C5257-414.
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REVIEW GUIDELINES In determining which systems to evaluate under thi's topic, the staff used the definition of " systems important to safety" provided in Regulatory Guide 1.105. The definition states that sy:tems important to safety are those necessary to ensure (1) the integrity of the reactor coolant pressure boundary, (2) the capability to prevent, or mitigate the consequences of accidents that could result in potenial offsite exposures comparable to the guidelines of 10 CFR Part 100,
" Reactor Site Criteria." This definition was used to determine which systems or portions of systems were " essential." Systems or portions of systems which performed functions important to safety were considered
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to be essential.
V.
EVALUATION The systems reviewed under the topic are the control room area ventilation system, spent fuel pool ventilation system, turbine and service building ventilation systems, radwaste area ventilation systems, and engineered safety features ventilation systems.
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Control Room Area Ventilation System The function of the Control Room Area Ventilation System (CRAVS) is to provide a controlled environment for the comfort and safety of control roan personnel and to assure the operability of control room components during normal operating, anticipated operational transient and design basis accident conditions.
As a result of TMI this system is being reviewed generically (TMI Item III.D.3.4, Control Room Habitability) to assure compliance with Criterion 19, " Control Room" of Appendix A, " General Design Criteria for Nuclear Power Plants," to 10 CFR Part 50. Therefore, the CRAVS was not reviewed under this topic.
B.
Spent Fuel Area Ventilation System The spent fuel pool ventilation area system is not essential for safe shutdown and was reviewed here only with respect to personnel safety as reflected in the criterion that air must be directed from areas of lower radioactivity to areas of progressively higher radioactivity.
The ventilation air flow over the spent fuel pool is downward toward the pool water surface, where it. is collected by a series of exhaust ports along the edge of the pool just above the water surface. Thus, the air flows from working areas to the pool water l
surface and into the exhaust ducts. The criteria for this review are satisfied.
C.
Turbine and Service Building Ventilation System The turbine and service building ventilation system is composed of three air supply systems. These include the condensate pump room heating and ventilation system, the shop heating and ventilation system and the equipment room cooling system. A description of each 4
is provided in Section 4.3 of FRC report TER C5257-414.
1.
The condensate pump room ventilation subsystem provides filtered, tempered outside air to the condensate pump room with provisions for recirculation (in cold weather). Based on the results of FRC evaluation, we have determined that this ventilation sub-system non-essential as defined in Section IV.
2.
The shop area ventilation subsystem provides tempered outside and recirculated air to the various shop areas.
It also provides ventilation for the four reactor depressurization system battery
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3-cubicles that have been added to the shop area in recent years.
During normal operation the shop area ventilation vstem provides a means of removing the hydrogen producted by the batteries, because this system is not powered from emergency source, the licensee should provide assurance that adequate ventilation is provided by other means during a 1pss of offsite power event during which thetshop ventilation system will not function.
3.
The electrical equipment room ve'ntilation subsystem services essential equipment which includes the main plant batteries, two motor-generator sets, air compressors for instrument air, 480V switchgear, and cable spreading. The ventilation system is mainly a service-water-cooled, recirculating room cooler which is neither redundant or powered by the energency Jiesel.
Because.of the importance of the equipment located in this room, the licensee should either demonstrate that ventilation of this equipment is not required or provide procedures to ventilate (e.g., open doors).
'D.
Radwaste Area Ventilation System The radwaste area ventilation system is vented from the condensate pump room ventilation system which is part of the turbine and service building ventilation system. Based on the results of Franklin Research Center evaluation, we have determined that the above mentioned radwaste area ventilation subsystems are non-es'sential as defined in Section IV.
E.
Engineered Safety Features Ventilation Systems This section reviews the ventilation of safety-related systems and components necessary for safe shutdown and post-accident operation that were not reviewed above under the topics of major building ventilation systems. A description of these systems is provided in Section 4.5 of FRC report TER C5257-414.
1.
Screenhouse Ventilation The diesel and electric fire pumps, which are located in the screenhouse, are major elements of both the post-incident cooling and fire protection water system. This ventilatlun system consists of ventilation louvers on the outside walls with circulation fans inside the screenhouse.. These fans are not powered by emergency sources, therefore, their operation is not assured following an event. However, based on the building volume to heat lead ratio and the non-leak tight nature of this building, the staff has determined that an active ventilation system is not required.
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Core Spray System Ventilations The core spray pump room houses the core spray pump and a heat exchanger which supplies emergency cooling water to the reactor vessel and the containment building. This area is not ventilated.
The heat rise in the core spray pump room area following an accident due to recirculation of the containment sump water is not expected to raise the room temper,ature greater than 152*F,(reference)
CPCo submittals to NRC dated 10/31/80 and 1/30/81). This heat load l
is not detrimental to the operation 'of the core spray pump.
3.
Reactor Protection System Instrumentation for the reactor depressurization system was observed during a plant visit to be located in the computer room.
Cooling for the room is provided by service-water-cooled air conditioning equipment in an alcove opening off the room. Power to the air conditioning equipment is not supplied by diesel generator essential buses, and the equipment will not function upon a loss of offsite power. Recognizi,ng that this reactor protec-tion instrumentation will not be needed.over a long term and that any temperature increase in the room would take place over a longer.
period of time, the acceptance criteria for this review are satisfied.
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Emergency Power System The main emergency diesel generator room, located adjacent to the screenhouse, has a passive ventilation system. The passive ventilation system consists of ventilation louvers which allow outside air to enter the energency diesel generator room. Exhaust from the diesel engine is throuch the roof of the building.
While the diesel engine is cooled by service water, the radiant heat from the engine will produce a temperature rise in the diesel generator room. The licensee should either demonstrate that ventilation of the electrical equipment panel in ti.e room is not required or provide procedures to ventilate (e.g., open doors),
the engine for periods of sustained (as compared to periodic test) operation.
A backup diesel generator is mounted in a trailer van located at the site of domestic water well No. 1.
When needed, this backup diesei is connected manually to the emergency electrical power bus. Ventilation of the diesel is provided by opening large doors to expose the diesel engine and generator to the atmosphere on two sides and rear end of the trailer. This means of ventila-tion for the backup diesel satisfies all acceptance criteria for this technical review.
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CONCLUSION The ventilation systems for the Big Rock Point Plant were found to be in conformance with current criteria *for this topic except fdr the following:
1.
Following a los: of off-tite power event, the shop area ventilation system, which ventilates reacur depressurization system batteries, will be inoperative. During that inoperative period hydrogen is generated due to continued batterv charging. The licensee should define the maximum period the sy:' u could be inoperative, and demonstrate that the amount cf h o' ogen generated during that period will not exceed the minimum erna ? ?. ion limits.
2.
The electrical equipment room ventilation system is subject to disabling single failures. The licensee should evaluate the consequences of losing this system.
3.
The emi:rgency diesel generator room has a passive ventilation system; the effects of a non-active ventilation system on vapor dispersion and service conditions for the electrical panel for sustained opera-tions in this area should be evaluated.
VII. REFERENCES 1.
Letter, Robert Vincent to Dennis Crutcl-field, Licensees Topic IX-5 Safety Assessment, dated June 11, 1980.
2.
Franklin Research Center Technical Evaluation Report C5257-414, Review of the Design and Operation of Ventilation Systems for SEP Plants - Big Rock Point, dateo August 13, 1982.
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