ML20024G781
| ML20024G781 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 04/24/1991 |
| From: | PORTLAND GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20024G780 | List: |
| References | |
| NUDOCS 9104300295 | |
| Download: ML20024G781 (3) | |
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Trojan _ Nuclear Plant Document Control-Desk Docket 50 344-April 24 1991 License NPF 1-Attachment-Page 2 of 2 fjfNT SYSTEMS
-BASES 3/4J7.6 CONTROL ROOM VENTILATION SYSTEM The OPERABILITY of the_ control room ventilation system ensures that 1) the ambien _t air temperature does not exceed the. allowable temperature for continuous duty rating for.the-equipment and instrumentation cooled by this system-and 2)
' the ^ control ' room will remain habitable for operations personnel during and
- following all credible accident conditions. The OPERABILITY of this system in conjunction - with - control room design provisions --is based on limitin5 - the
- radiation exposure to personnel occupying the control room to 5 rem or less whole body, or its equivalent. This limitation is consistent with the requirements of
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General Design Criteria 19 of. Appendix "A",
System operability can-be affected by ECCS recirculation leakage 'and-Containment leakage should-the conditions assumed in FSAR Section 15.6.5.6 be exceeded, pyThuTTdsalihg3fshEti1W6fMhsiC6htW61TR66isl?EasYgsh6fWihtiilitfiUCS sVsar"c^ shibs pdifdihied 4yt the% CBi1Naubsysitiemialonhidh CB;16 ddos sinb rluse7the3 Se rvi c ei Wasei
. pyst4MfdSco$lihgNAsialsEnsEq'uenceijtihSilossifiSnviss$Watent@jp15$
CBV1fddesinot k*ssl$$1djthyMNOPERABj.(IgjsMheIcoh$rkl,jR6pm1Nrg$cy;yffhl The OPERABILITY of. this' system in conjunction with control room design
_ provisions is also based on limiting the toxic gas -exposure to control. room personnel consistent with the FSAR. design basis and Regulatory Guide.1.95, 1The recirculation mode'ofIoperation is: defined as stopping the control room
-normal ventilation system and maintaining the emergency control room ventilation system in ailine'up capable of responding to a ' safety _ injection signal f(jhji@lj QODEMiMWytyllnjj##6n7l@@ylrjQ. This does not preclude operating the-CB-1 fans with the outside ' air makeup dampers closed and/or performing the other required' actions in the event of. an actual chlorine release. 'In the event of.a radiation _' release while~ operating the system - in' the' recirculation mode of operation,1 the _ system is operated in '_the_ pressurization modo of operation by opening the outside air dampers.- Operation of the system in this manner meets-the intent J of this specification and satisfies.. the FSAR desi n basis and 6
l-Jrequirements CDC-19.
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-9104300295 910424 l
PDR ADOCK 05000344 p.
I PLANT SYSTEMS BASES 3/4.7.6 CONTROL ROOM VENTILATION SYSTEM The OPERABILITY of the control room ventilation system ensures that
- 1) the ambient air temperature does not exceed the allowable temperature for continuous duty rating for the equipment and instrumentation cooled by this system and 2) the control room will remain habitable for operations personnel during and following all credible accident conditions. The OPERABILITY of this system in conjunction with control room design pro-visions is based on limiting the radiation exposure to personnel occupying the control room to 5 rem or less whole body, or its equivalent.
This limitation is consistent with the requirements of General Design Criteria 19 of Appendix ' A",10 CFR 50. System operability can be affected by ECCS recirculation leakage and Containment leakage should the conditions assumed in FSAR Section 15.6.5.6 be exceeded.
The cooling function of the control room emergency ventilation system can be performed by the CB-16 subsystem alone.
CB-16 does not use the service water system for cooling. As a consequence, the loss of service water to CB-1 does not result in the inoperability of the control room emergency ventilation system.
The OPERABILITY of this system in conjunction with control room design provisions is also based on limiting the toxic gas exposure to control room personnel consistent with the FSAR design basis and Regulatory Guide 1.95.
The recirculation mode of operation is defined as stopping the control room normal ventilation system and maintaining the emergency control room ventilation system in a lineup capable of responding to a safety injection signal (when in a MODE where safety injection is required).
This does not preclude operating the CB-1 f ans with the outside air makeup dampers closed and/or performing the other required actions in the event of an actual chlorine release.
In the event of a radiation release while operating the system in the recirculation mode of operation, the system is operated in the pressurization mode of operation by opening the outside air dampers.
Operation of the system in this manner meets the intent of this specification and satisfies the FSAR design basis and requirements GDC 19, 3/4.7.7 SEALED SOURCE CONTAMINATION The limitations on sealed source removable contamination ensure that the total body or individual organ irradiation does not exceed allowable limits in the event of ingestion or inhalation of the source material.
The limitations on removable contamination for sources requiring leak testing, including alpha emitters, is based on 10 CFR 70.39(c) limits for TROJAN-UNIT 1 B 3/4 7-5 Amendment No. 78, 25, 152 May 15, 1989 NSRD Revised April 1, 1991
I PLANT SYSTEMS BASES (Continued) plutonium.
Leakage of sources excluded f rom the requirements of this specification represent less than one maximum permissible body burden for total body irradiation if the source material is inhaled or ingested.
3/4.7,8 FIRE SUPPRESSION SYSTEMS The OPERABILITY of the fire suppression systems ensures that adequate fire suppression capability is available to confine and extinguish fires occurring in any portion of the facility where safety related equipment is located.
The fire suppression system consists of the water system, sprinklers and fire hose stations. The collective capability of the fire suppression systems is adequate to minimize potential damage to safety related equipment and is a major element in the facility fire protection program.
In the event that portions of the fire suppression systems are inoperable, alternate backup fire fighting equipment is required to be made available in the affected areas until the inoperable equipment is restored tc service.
TROJAN-UNIT 1 0 3/4 7-5a Amendment No. 78, 25, 152 NSRO Revised April 1,1991
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