ML20196F305
| ML20196F305 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 02/24/1988 |
| From: | HOUSTON LIGHTING & POWER CO. |
| To: | |
| Shared Package | |
| ML20196F301 | List: |
| References | |
| NUDOCS 8803020226 | |
| Download: ML20196F305 (6) | |
Text
{{#Wiki_filter:. l ATTACHMENT 5 . ST.HL AE M33 STP FSAR PAGE1 0F (0 recirculation air, throu5h the cleanup filters. For a complete description of the Control Room Envelope KVAC System and its operation, refer to Section 9.4.1. Section 6.4 provides an analysis of control room envelope habita-bility. Section 11.5 providas a description of the radiation monitors. 7.3.2.1.1 System Description-1. Actuating Circuits 1 The gaseous radioactivity level of the control room /EAB makeup air is monitored by two independent and separate radiation moni. tors. Each monitor transmits a signal to the ESFAS if acceptable radioactivity levels are exceeded. The sensitivity and response times of these -[ ' monitors are listed in_ Table 7.3 16.[ Monitor failure is also sensed and transmitted to the ESFAS, resulting in HVAC system operation as if radia-tion levels were high. The Vestinghouse ESFAS transmits signals to this ESFAS when an SI signal is generated 3 The ESFAS may also be initiated manually. 2. Logic The Control Room Envelope HVAC ESFAS logic is shown on Figure 7.3-24 As can be seen on this figure, the two redundant radiation monitors each have three separate t.nd redundant outputs, one gtoch_ of the ESFAS trains. In this way, detection of high radiation Lor monitor failure) in either monitor actuates all three trains of HVAC equipment. For a safety injection signal generated by the Vestinghouse ESFAS, the signal is sent to the ESF load sequencers and then to the HVAC ESFAS. In this way, all of the control room envelope HVAC components are actuated to the emergency mode at the same time. (Safety injection corresponds to ESF load sequencer mode I. Refer to Section 8.3.) Manual initiation capability is provided by actuate switches, one for each actuation train. Reset capability is also provided on a per train basis. The actuation signal is transmitted to each actuated device, causing each device to assume its safe state for these emergency conditions. 3. Bypass There is no bypass. Manual reset of the actuation signal may be performed, thus allowing the operator to assume manual control of the Control Room Envelope HVAC System. This would be desirable for example for manual shutdown of one train following actuation of all three trains of HVAC. It is noted that reset of the actuation signal does not reverse the actuation of ESF equipment. The equipment remains in its emergency Q032. mode until the operator takes manual action on a component by component 43 basis. 7.3 21 Amendment 53 8803020226 880224 PDR ADOCK 05000498 P DCD m
ATTACHMENT 3 ST HL AE GSM STP FSAR PAGE a>0Fb l t 7.3.3 Fuel Handling Building HVAC ESFAS The ESFAS for the Fuel Handling Building HVAC System uses the spent fuel pool ventilation radiation monitors to se.ise whether predetermined setpoints have been exceeded. If they are, or if ths Westinghouse ESFAS has generated a safety injection signal, the ESFAS sents actuation signals to the appropriate FHB HVAC components. The ESFAS meets the requirements of CDC 13, 20, 21 and 22. 7.3.3.1 Description. The ESFAS for the FHB HVAC System receives high radiation signals from the redundant spent fuel pool ventilation radiation monitors and the safety injection signal from the NSSS ESFAS. Upon receipt of any of these signals, the building exhaust air is diverted through filters and the supply system is tripped. For a complete description of the Fuel Handling Building HVAC System and its operation, refer to Section 9.4.2. Section 11.5 provides a description of the radiation monitors. 7.3.3.1.1 System
Description:
1. Actuating Circuits The gaseous radioactivity level of the spent fuel pool exhaust air is monitored by two independent and separate radiation monitors. Each 43 monitor transmits a signal to the ESFAS if acceptable radioactivity monitors are listed in Table 7.3-16. Di~ohitor TailWis aTsrieniH_a,n$r; levels are exceeded. The sensitivity and response times of these d i 53 ransmitted to the ESEAS, resulting in HVAC operation as if radiation ~-j levels were high. _ ~ ~ -- The Westinghouse ESFAS transmits signals to this ESFAS when an SI signal is generated. The ESFAS may also be initiated manually. 2. Logic i l The Fuel Handling Building HVAC ESFAS logic is shown on Figure 7.3 27. As can be seen in this figure, the two redundant radiation monitors each have three separate and redundant outputs, one to h of the ESTAS _ o_ trains. In this way, detection of high radiation ormonitorfailure)] actuates all three trains of HVAC equipment. A safety injection signal, one from each of the Westinghouse ESFAS actuation trains, is also sent to each ESFAS train, l i Manual actuation capability is provided by actuate switches, one for each i actuation train. Reset capability is also provided on a per train basis. The actuation signal is transmitted to each actuated device, causing each device to assume its safe state for these emergency conditions. 7.3 26 Amendment 53 l
STP FSAR ATTACHMENT 3 . ST HL AE M33 _ PAGE ~3 OF (o offluents for iodines and particulates and for noble gas effluents from the plant vent. 11.5.2.3.4 Control Room Electrical Auxiliary Building (CR/EAB) Ventilation Monitors: The CR/EAB ventilation monitors are Class 1E monitors which continuously assess the intake air to the CR for indication of abnormal cirborne radioactivity concentration. Each monitor assembly is powe ed from a ' taparate electrical power source. In the event of high radiation Cor monitor y O P-{failur g CR emerg cy ntigtionopgrationisinitiated(seeSection7.3.2). y y p ;/r e. la e con m. are Each monitor assembly is comprised of a recirculation pump, beta sensitive scintillation detector, four pi lead shielding, check source, stainless steel sample gas receiving chamber, and associated electronics. 11.5.2.3.5 Condenser Vacuum Pump Monitor: Caseous samples are drawn through an off line system by a pump from the discharge of the vacuom pump cxhaust header of the condenser. This channel monitors the gaseous sample for radioactivity which would be indicative of a SG tube leak, allowing reactor coolant to enter the secondary side fluid; this monitor complements the SGBD monitors in indication of a SC tube leak. The gaseous radioactivity levels cre monitored by three detectors, in a manner similar to the unit vent wide range gas monitor. This monitor also satisfies the requirements of NUREG-0737, Item II.F.1 for provisions for sampling plant effluents for iodines and particulates and for noble gas effluents from the condenser. g 11.5.2.3.6 Spent Fuel Pool Exhaust (SFPE) Monitors: The SFPE monitors cre Class 1E monitors and are identical to the CR/EAB ventilation monitors described in Section 11.5.2.3.4 excp tithat they sample tb exhaust from the FHB. In the event of high radiation (or monitor failure) the monitors initiate caergency operation of the FHB heating ventilating and air conditioning (HVAC), causit thp'exhaustairjobegilteregpyiortorelease(seeSection Us" t l' Sm 7. 3. 3 ). M&e t- - cem e m. 11.5.2.3.7 RCB Purge Isolation Monitors: The RCB/ purge isolation moni-tors are Class 1E monitors that sample the Containment Normal Purge System or 61 the Supplementary Purge System and are identical to the CR/EAB ventilation ronitors described in Section 11.5.2.3.4. In the event of high radiation or, - 9 monitor failure) the monitors send signals to the Solid State Protection ' ' C
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11.5.2.4 Liquid Monitors. Fixed, off line monitors are provided for continuous detection and measurement of radioactivity for liquid process streams. The design parameters for these monitors are summarized in Table 11.5-1. Each monitor is provided with domineralized water for flushing. 11.5.2.4.1 Sarepling Devices: For each monitor, a sample is drawn from the process line, passed through a shielded sample chamber, through the sample pump and then returned to the system. Each sample pump is capable of drawing et least one gal / min of liquid through the monitor. The sample flow rate is controlled by means of a manual valve. Each monitor has a low sample flow alarm. 11.5 12 Amendment 61
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