ML20129E138

Rev 8 to Sys Procedure Sp 1104.69, Control Room Emergency Sys Ventilation Procedure

ML20129E138
Person / Time
Site:	Davis Besse
Issue date:	04/09/1985
From:	Quennoz S TOLEDO EDISON CO.
To:
References
SP-1104.69, NUDOCS 8507300264
Download: ML20129E138 (8)

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Davis-Besse Nuclear Power Station SP 1104.69 Unit No. 3.

9 System Procedure SP 1104.69 Control Room Emergency Ventilation System

- Procedure E3RSAElR!ED Record of Approval and Changes Prepared by W. Alton 1/1 e / 7A Date Larry C. Stalter 6/18/74 g

Section llend Date 0 2, Recom. ended by v ,1, ru.n . 4 /, a ivr.

SRB Chairnan Date QA Approved flA

• Manager of Quality. Assurance Date Approved by Jack Evans 6/19/74 Station Superintendent Data Revision SRB QA Sta. Supt No. Rec ation Date Approved Date pro- Dat

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1 SP 1104.69.8

, 1. PURPOSE To provide procedures for operating the Control Room Emergency Ventilation System in the following modes:

Mode Section Startup 4 Shutdown 5 Abnormal Operation 6 The Control Room Emergency Ventilation System consists of two recircula-tion centrifugal fans (3300 CFMs), two dual condenser air cooling units (water cooled and af r cooled), two motor operated fresh air intake dampers, two sets of filter banks (prefilter, high efficiency absolute filter, and charcoal adsorber) and the associated dampers and ductwork.

During normal operar. ion, the Control Room Emergency Ventilation System is held on standby. The system is continuously monitored and alarmed for high control room radiation, motor overload and high

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filter-differential pressure. Under normal operating conditions the Control Room will be free of airborne r:dioactivity and high chlorine 1

levels. In the event of high radioactivity after a I,0CA or high chlorine levels after a chlorine leak, the Control Roon Normal

.O Ventilation System is shutdown automatically and the emergency 0 J' ventilation system is initiated manually from the Control Room in a closed complete recirculation mode in which outside air is not introduced by leaving the mini == outside air dampers in the closed position. All Control Roon Normal Ventilation System outside air dampers will automatically close to minimize the dose to operating 8 personnel due to inhalation of fission products or chlorine gas. If the suction air temperature to the CTRM EVS Fans is greater than 75'F, the CTRM EVS condensing units will start.

After the Control Room Emergency Ventilatiou Units have started, the automatic service water valves will open. If flow is received and the service water temperature is between 55 and 85 degrees Fahrenheit, the condensing unit will remain in the water cooled mode; if not, the service water valve will close and the condensing unit will automatically switch to the sir cooled mode.

The Control Room emergency ventilation system filters have a total efficiency not less than 95%, so that the limits of Criterion 19 of 8 10 CFR 50, Appendix A, are met. For habitability considerations (primarily CO2 buildup) after Control Room isolation, fresh air may be introduced into the Control Room by opening the minimum outside air dampers.

2. REFERENCES

'1 2.1 Davis-Besse Unit 1 Updated Safety Analysis Report, Section 9.4.1 l -

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2 SP 1104.69.8 2.2 Service Water System Procedure, SP 1104.11 . .

2.3 Control Room Ventilation System Procedure, SP 1104.14 2.4 Control Room HV and AC Piping and Instrument Diagram No. M-027A 2.5 480 V MCC (Essential) 'One Line Diagram No. E-6, Sheet 1 of 2 2.6 StanMag Order 24 - Ventilation for painting & welding 8l 2.7 AB 1203.14, Toxic Gas and Liquid Release

3. LIMITATIONS AND PRECAUTIONS 3.1 Do not operate the Control Room Emergency Ventilation Fans when the following limits on the filtcr elements are exceeded:

Approximate Control Room EVS Clean D/P Filter 1-1 (1-2 Limit (in H 2O)

Element Local Indicator (in H,0) Not A Limit ,

Prefilter PDI 5295 (PDI 5298) 1.0 ~.15 HEPA Filter PDI 5294 (PDI 5297) 2 ~.5 Charcoal Absorber PDI 5293 (PDI 5296) 1.5 ~.25 3.2 .inenever the Control Room Emergency Cooling System is inop,erable ." l .)

because of failure, repair work progress or routine maintenance on the system, the operator is to turn IL 4809 "CTRM CLNG" on using BS 4709 panel C5717. This light is to remain illuminated as long as the system is inoperaM e.

4. STARTUP 4.1 Prerequisites 4.1.1 The Control Room Emergency Ventilaiton System Air Conditioning Units must be lined up for automatic operation as per Enclosure 1.

4.1.2 The Service Water System must be in operation to supply cooling water to the air condition unit as per the Service Water System Procedure, SP 1104.11.

4.1.3 Power must be available to the following breakers and the breakers closed.

Breaker Panel Equipment i BE1209 MCC E12A CTRM Emer Vent Fan 1-1 BE1216 MCC E12A CTRM Emer A/C Unit 1-1

'BE1232 MCC E12A SW Inlet Valve SW2927 BE1144 MCC E11C Minimum Outside Air Depr HA5261A 1

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, BE1148 MCC EllE CTRM Emer Standby A/C Unit 1-1

. BF1149 MCC Fila CTRM Emer Vent Fan 1-2 BF1131 MCC Fila CTRM Emer A/C Unit 1-2 BF1132 MCC Fila SW Inlet Valve SW2928

-BF11A6 MCC F11B Min. Outside Air Dupe HA5262A BF1229 MCC F12A CTRM Emer Standby A/C Unit 1-2

3 4.1.4 Close HV 5261 and HV 5262 minimum outside air intake dampers from HIS 5261A and HIS 5262A on Control Room Panel C5720.  !

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4.2 . Procedure The Control Room Emergency Ventilation System will be started manually using this procedure whenever the Control Roon Normal Ventilation System is shutdown by one of the following signals:

i 1. SFAS Incident Level 1 8l 1

(TS 3.3.3.7) 2. Chlorine Gas Detection (Setpoint <5 ppe by volume)

3. High Airborne Radiation (Setpoint as per the Radiation Monitoring setpoint book in the Control Room).

l 4.2.1 Turn the Control Room Emergency Ventilation Unit

! 3 , 1-1 and Unit 1-2 switches on Panel C5720 to START.

(",. Ensure the OFF-MANUAL-AUTO switch on RE5327 and RE5328 are in AUTO and that the radiation monitor for the i respective C.R. EVS inn started with the fan starting.

4.2.2 Check proper operation of the filters by observing that the differential pressure is within the indicated values. (Step 6.3) Listed under Limitations and Precautions, Section 3.1.

8l 4.2.3 If the temperature of Control Roon return air is l greater than 75'F, verify that the Control Room Emergency Air Conditioning Units 1-1 and 1-2 start.

. 8 The unit will start in the water cooled mode. If the service water temperature is between 55 and 85'F the

< condensing unit will remain in the water cooled mode; if not, the service water valve will close and the condensing unit will automatically switch to the air cooled mode. (The water cooled mode is noted by the Service Water Valves SW2927 - Unit 1-1 and SW2928

- Unit 1-2 opening and remaining in the open position.)

l 8' 4.2.4 open the minimum outside air intake when control' Room atmosphere needs replenishment (it is espected that con level will approach its limit within d days of

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4 SP 1104.69.8 s

8l isolation). This is accomplished by opening dampers 1 NA 526IA and NA 5262A using the Emergency Ventilation - j Fan 1 and 2 inlet valve switches on Panel C 5720 in l 8 the Control Room. The outside air dampers should be opened periodically for about an hour to change out the air voltane of the Control Room and then close until required again.

I S. SHUTDOWN 1 This procedure will be followed any time the system is to be shutdown. l

_5.1 Shutdown the Control Room Emergency Ventilation System by turning the switches HIS5261 and HISS 262 on Panel C5720 to Stop.

NOTE: With the fans stopped, the air conditioning unit will automatically stop.

5.2 Close the minimum outside air dampers (if open) using the Emergency Ventilation Fan 1-1 and 1-2 Inlet Valve switches "

HIS5261A and HIS5262A on Panel C5720.

5.3 Stop the Radiation Monitor RE 5327 (RE 4323) for Control Room EVS Fan 1-1 (1-2) by turning off the pump at the control monitor.

Ensure the Off-Manual-Auto switch is still in the Auto position. ,,

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6. ABNORMAI OPERATION _?

The following abnormal operations will be discussed.

Section Radiation Alarm 6.1 Motor Overload 6.2 High Filter Differential Pressure 6.3 6.1 Radiation Alarm i

When a high radiation alarm is sensed in the discharge from one of the Control Room Emergency Ventilation Fans, you will receive l an alarm on Computer Point R346 or R347 for Fan 1 or Fan 2 respectively. If the alarm is received on both fans, shutdown the fan with the highest radiation as read on RI5327A, B, and C (Fan 1), and RI5328A, B, and C (Fan 2).

6.2 Motor Overload I

When an overload condition occurs, you will receive a white  ;

light on the indicator switch for the fan with the. overload

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5 SP 1104.69.6 condition. If an overload condition occurs, these fans will not trip; therefore, it is up to the operator to determine whether the fan can be tripped or must remain operating in an emergency situation. These fans can either be tripped from Panel C 5720 or locally.

6.3 High Filter Differential Pressure If the differential pressure across any filter exceeds the limit listed in the Limits and Precautions, Section 3.1, shutdown the respective Control Room Emergency Ventilation Tan (1-1 or 1-2) as per Section 5 of this procedure.

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6 SP 1104.69.8 Pre-Startup Signoff Sheet /

CONDENSER UNIT 1-1 PANEL C6708

(_'uipment No. Switch Position Verified Hot Gas Solenoid Valve SV4823 HIS4823 Auto Hot Gas Bypass Solenoid Valve SV4823A HIS4823A Auto Liquid Solenoid Valve SV4324 HIS4824 Auto Air Cooled Condenser Selector S61-1 N/A Auto Switch Air Cooled Condenser Fan S61-1 NS0611 Auto PANEL C6706 8l Water Cooled Condenser Local S33-1 NS0331 ON ,

Switch CONSENSER UNIT 1-2 PANEL C6709 Equipment No. Switch Position Verified ,

Hot Gas Solenoid Valve SV4827 HIS4827 Auto Hot Gas Bypass Solenoid Valve SV4827A HIS4827A Auto Liquid Solenoid Valve SV4828 HIS4828 Auto Air Cooled Condenser Selector S61-1 N/A Auto Switch Air Cooled Condenser Fan S61-1 NS0612 Auto PANEL C6707 Water Cooled Condenser Local S33-2 N30332 ON Switch Enclosure 1 Page 1 of 1 i

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COMMITMEh"rS STEP NO. COMMENTS REFERENCE 4.2.4 USAR Step 9.4.1 Details of required assumptions used in safety analyses.

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