ML20210U738

Rev 1 to Control Room Emergency Air Sys for Units 1 & 2

ML20210U738
Person / Time
Site:	Beaver Valley
Issue date:	04/02/1985
From:	Mantine F, Nass S, Pulling W DUQUESNE LIGHT CO.
To:
Shared Package
ML20210U721	List: ML20210U716 ML20210U738 ML20210U758 ML20210U793
References
DCP-611, DCP-611-R01, DCP-611-R1, NUDOCS 8702180574
Download: ML20210U738 (12)

Text

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ATTACHMENT 1

• Design Concept DCP 611 Revision 1 Page 1 of 5 CONTROL ROOM DERGENCY AIR SYSTEN FOR UNITS 1 & 2 1.0 Design Objective The design objective of this design change package is to modify the existing Beaver Valley Power Station (BVPS) Unit 1 Control Room Emergency Bottled Air Pressurization System (CREBAPS) to accommodate the BVPS Unit 2 control room area. This modification will provide automatic emergency pressurization of both control room areas during a Unit 1 or Unit 2 containment isolation Phase B (CIB) or a high chlorine condition.

2.0 Boundaries of Change

1. The north and south coolant recovery tank cubicles.

2. The radwaste solidification and decontamination systems area.

3 The Auxiliary Building, elevation 768 ft. - 7 in., including the following areas / components:

a. The east wall area

b. Compressed air storage tank lines 1" VS-13-1502-Q3 through 1" VS-17-1502-Q3, Category I piping.

c. Emergency air tanks compressor (VS-C-2).

4. Power and control circuitry for the following Unit 1 components: [

a. Solenoid operated valves SOV-VS-101A1, A2, B1, B2, C1, C2, D1, D2, E1, and E2.

b. Outside air intake dampers VS-D-40-1A and 1B.

c. Minimum outside air intake dampers electropneumatic switches EP-1VS-101-14A and 14B.

d. Outside air exhaust dampers VS-D-40-1C and 1D.

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e. Control Roon recirculation dampers electropneumatic switches i EP-1VS-101-1A and 1B.

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f. Emergency supply fans VS-F-1A and 418. )

5. The following electrical power and control equipment / systems:

a. Unit 1 125V dc Category I Distribution System.

b. Unit 1 Category I relay panels PNL-REL-35 (crange) and PNL-REL-36 (purple).

8702180574 870209 PDR ADOCK 05000334 P PDR

.d

. Design Concept DCP 611 Revision.1 Page 2 of 5

c. Unit 1 and Unit 2 Category I isolation panels PNL' REL-280 (orange) and PNL# REL-290 (purple).

d. Unit 1 480V ac Category II Electrical Distribution System.

These items to be furnished / completed by BVPS-2 are included herein only for information.

6. Control circuitry for the following Unit 2 components:

a. Outdoor air intake dampers 2HVC# MOD 201A and 201B.

b. Exhaust air dampers 2HVC* MOD 201C and 201D.~ .

c. Emergency Control Room supply fans 2NVC'FN241A and 241B. .

d. Dampers 2HVC* HOD 202A, 202B, 203A, 203B, 204A, and 204B.

7. The Service Building, Air Conditioning Equipment Room, elevation 713 ft. - 6 in., including the following equipment:

a. Control Room Energency Supply Fans VS-F-41A and 41B.

I

b. Suction and Discharge ducting for C.R. Emergency Supply Fans including dampers and he&ters VS-E-13A and 138.

c. Discharge duct including dampers on outlet at filter VS-FL-1, 2, 3

3 0 Design Inputs i

1. Beaver Valley Power Station Unit- 1 Updated Final Safety Analysis Report, Sections 1.7, and 9.13 t

2. Beaver Valley Power Station Operating Manual Chapter 44A,- Issue 2, -

7 Area Ventilation Systems - Control Area.

3 Beaver Valley Power Station Unit 2, Rev. O, Reg. Guide Position per Aamendment 3 to Reg. Guide 1.78.

4. NRC Regulatory Guide 1.78 and 1.95 4

5 Beaver Valley Power Station Unit 2, Rev. 1, Reg. Guide Position per Ammendment 3 to Reg. Guide 1.95

6. NUREG-0737, Action Item III.D.3 4

7. 10CFR50 Appendix A, General Design Criterion 2, 3, 5, and 19.

8. ANSI B31.1, Power Piping, 1967.

9 ASME Section VIII Division 1, 1983 including Summer 1983 Addendum.

4 .

4 Design Concept DCP 611 i Revision.1 Page 3 of 5

,c

10. Beaver Valley Power Station Unit 1, Plant Modification Manual.-

s

11. The system sust be capable of:

i i a. Pressurizing the combined BVPS Unit 1 & 2 control room areas to a positive pressure of one eighth (1/8) on an inch of water pressure above the surrounding areas for a period of one hour.

Performing its intended function in conjunction with.a loss of b.

offsite power.

j c. Performing its intended function despite a " single failure".

d. Performing its intended function when either BVPS Unit 1 or 2 is .

i operating regardless of the status of the other unit.

4.0 Design Approach f The CREBAPS is required to maintain a positive pressure in the control-room areas to prevent possible radioactive inleakage to these areas during the ,

period of time that the containment is above atmospheric

• pressure (1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />) following a design basis accident. The system will also prevent inleakage ,

' of chlorine in the event of a high chlorine concentration in the vicinity of the control room area ventilation intake ducts. The Unit 1 areas

. pressurized by the CREBAPS are the main control room, office and computer.

j roca, process instrument room, relay room, and communications room. This ,

1 modification will increase the capacity and supply rate of the existing '

} CREBAPS to include pressurization of the Unit 2 control room, computer room, and equipment room areas. .

{

i The compressed air storage capacity of the existing CREBAPS will be increased by the addition of five new compressed air storage tanks to be located in the south coolant recovery tank cubicle, elevation 735 ft. - 6 in. These new storage tanks will be equivalent in capacity and pressure to existing tanks VS-TK-6A, 6B, 6C, 6D, and 6E (located in the north coolant recovery tank cubicle). The combined capacity of the compressed air storage a tanks will be sufficient to maintain pressurization of the Unit 1 and Unit 2

! control room areas for one hour.

Air lines from the new compressed air storage tanks will be routed from the

- south coolant recovery tank cubicle, through the radwaste solidification and

! decontamination systems area, through the south wall of the north coolant recovery tank cubicle and through the east wall of the north coolant i recovery tank cubicle. The new air lines will be connected to the existing CREBAPS at lines 1" VS-13-1502-Q3 through 1" VS-17-1502-Q3 Larger restricting orifices will -be installed replacing the existing restriction orifices RO-VS-101A, 101B, 101C, 101D, and 101E so that the flow rate i through each orifice will be increased to 200 cra. To increase control valve stability a combination of signal restrictors and volume chambers will be installed at the pressure controllers PIC-VS-101A, 101B, 101C, 101D, and j 101E in the pneumatic signal line to the pressure control valves PCV-VS-

! 101A, 101B, 101C, 101D, and 101E.

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c.

. 4 Design Concept DCP 611 Revision 1 Page 4 of 5 Control circuitry for existing Unit 1 CREBAPS components will be modified to incorporate signals from Unit 2, and Unit 2 components will receive signals from Unit 1. These modifications will enable the CREBAPS to be automatically initiated by a Unit 1 or a Unit 2, Train A or Train B, Containment Isolation Phase B (CIB) signal. The system will also be automatically initiated by a Unit 1 or a Unit 2 chlorine isolation actuation signal. _ Signal isolators will be provided for any signal which crosses from Unit 1 to Unit 2 or vice versa.

In addition to these modifications, there must be a method or procedure which assures that this system is operable whenever either unit (BVPS Unit 1 or 2) is in operation. Therefore, whenever BVPS Unit 1 is in mode 5 or 6, the control room ventilation system will be isolated. This will assure that the outside air intake daspers (VS-D-40-1A & IB) and the outside air exhaust -

daspers (VS-D-40-1C & 1D) are shut and cannot reopen due .to a spurious signal. A similar method of isolating the BVPS Unit 2 control room ventilation system will be used whenever that unit is in mode 5 or 6. BVPS Unit 1 Technical Specifications, section 3/4.7.7 Control acc= E=ergency Habitability System, will be revised to include a statement that operability of the emergency ventilation system and the bottled air pressurization system will be required when BVPS Unit 1 is in mode 5 or 6 and BVPS Unit 2 is in mode 1, 2, 3 or 4.

Also when BVPS Unit 1 is in Mode 5 or 6 and BVPS Unit 2 is in Mode 1, 2, 3 or 4, the power to operate solenoid valves SOV-VS-103A1, A2, B1, B2, C1, C2, D1, D2, E1, and E2 will be supplied from BVPS Unit 2 energency busses.

This modification requires technical specification 3.7.7.1 to be revised to include the additional air storage bottles. Prior to the common wall

• between BV-1 and BV-2 being removed, this technical specification change must be approved by the NRC. ~

Manual initiation capability (Train A or Train B pushbutton) will be available from both control rooms. The signal isolator cabinets will define the boundary for the control interface between Unit I and Unit 2, and the boundary for this design change package.

A larger air compressor will be installed in place of VS-C-2 to increase the 1 charging capability of the existing system. This modification will be Q.A.

Category I, with the exception of the new air compressor, which will be Q.A.

Category III. All Category I equipment will be seismically installed. This ,

modification will affect changes to the Updated FSAR and Technical Specifications.

The Control Room Emergency Supply Fans VS-F-41A and 41B will be replaced with larger fans capable of supplying the increased flow rate (800 -

1000 scfs) required by the combined Unit 1 and Unit 2 Control Room areas. In addition to increasing the fan size, the supply and discharge ' ducting for j the fans and filter (VS-FL-1, 2, 3) will be increased in size, larger duct heaters (VS-E-13A and 13B) and daspers will be installed. -To- obviate the possibility of too much positive pressure in the Control Rooms, p redesigned control scheme will be installed which will start up only one fan (including

Design Concept DCP 611 Revision 1 Page 5 of 5 its dampers) at a time; should the first ran fall to start, the second fan l (including its dampers) would then be started.

5.0 Design Outputs

1. Flow Diagrams

2. Logic Diagrams 3 Elementary Diagrams

4. Arrangement Drawings 5 Wiring Diagram

6. Conduit Drawings

7. Isometric Drawings

8. Calculations

9. Design Verification Report

10. Cable and Raceway Input Sheets

11. Cable Tags

12. Bill of Material 13 Construction and Installation Specifications

14. Procurement Specifications

15. Test Specifications

16. Systen Sn==ary

17. Support Drawings

18. Bills of Material 19 Fire Hazard Analysis

20. UFSAR and Tech. Spec. Changes

21. Update Master Equipment List I

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ENGINEERING 10CFR50.59 SAFETY EVALUATI G 1 STATI W: Beaver Valley Unit No.1

- SYS11M: M.iln Control Area Ventilation EQUIPBENT: Emergency Air Pressure ' Vessels, Air Conpressor, & Eunu.yncy Supply Fans MARK NG.: VS-TK-7A, B, C, D, E, VFrC-2, VS-F-41A and 41B DESIGN CWCEPT. NO. 611, Dated 2/22/85, Revision l_:

DESCRIPTIG & PURPGE &-REVISIG Revision 1 of this design concept includes replacing the Cbnwl Room Emergency Supply Fans VS-F-41A and 41B with larger fans capable of supplying the increased flow rate required by the combined Unit 1 and Unit 2 control room areas. In additton larger ductwork,- heaters, and danpers will be installed as required. The objecti.ve and design requirerrents of the original design concept have not been revised.

SAFETY EVALUATI W Including the replacement of the energency supply fans in this design concept does not change the conclusions or bases of the original safety evaluation. This rrodification will not increase the Erobability of an occurrence or the consequences of an accident or nalfunction of equipsent inportant to safety as previously evaluated, nor create a new type of accident not '

previously evaluated in the UFSAR. This modification will not adversely affect the trargin of safety as defined in the basis for any technical specification and an unreviewed safety question is not raised.

During a design basis accident, activity ae5== from the containment '

only during the first hour until the ESF systems return the containment pressure to subatnospheric. The GEBAPS will pressurize both Unit 1 and Unit 2 control room areas during this time to prevent inleakage of activity into the control rooms.

The errergency supply fans come cm after the activity release from containment has been taminated.

The energency supply fans VS-F-41A & B are GA Category I.

m,___. _- . _ . . . _ , . - - _~ ~ - , _ _ . . . . . _ . _ _ . . _ _ . _ -

REFERENCES

1. 10CFR50; Appendix A, Criterion 19

2. Updated FSAR; Sections 1.7, 9.13.4, 11.3.5, 14., Figures 1.2-B, 9.13-3

3. Technical Specifications; Section 3.7.7.1

4. Source Docurnent; Design Concept for DCP 611 Rev.1.

Prepared by 3/I/g[

S. A. Nahs mte Qiecked by ,

F. JY Mantine "

, h/'

d

' Date APproved by A *A e ' )~h Date D

w. T. eu:.ruxyg-Review by CSC at Meeting No. 89-05 C - /f -W Date V /f')-

CSC Action: [ Accept Reject Returned with coments CSC ChauTnan 'W Date Yb!W l

1 1

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