ST-HL-AE-1227, Summarizes 850404 Meeting to Discuss Details Re Alternate & Safe Shutdown Sys for Fire Protection.Meeting Agenda & Viewgraphs Encl

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Summarizes 850404 Meeting to Discuss Details Re Alternate & Safe Shutdown Sys for Fire Protection.Meeting Agenda & Viewgraphs Encl
ML20116D453
Person / Time
Site: South Texas  STP Nuclear Operating Company icon.png
Issue date: 04/24/1985
From: Wisenburg M
HOUSTON LIGHTING & POWER CO.
To: Knighton G
Office of Nuclear Reactor Regulation
References
CON-#285-730 OL, ST-HL-AE-1227, NUDOCS 8504290417
Download: ML20116D453 (50)
v • d • e


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The Light Company n,mi, ugmig u,m m m>x nm n,>, ism,>.rexas mm m3msan April 24, 1985 ST-HL-AE-1227 File No.: G4.2; G9.7 Mr. George W. Knighton, Chief Licensing Branch No. 3 Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. Knighton:

South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Summary of Meeting with the NRC-Safe Shutdown Systems for Fire Protection On April 4, 1985, Houston Lighting & Power Company (HL&P) representatives met with members of the NRC staff to discuss details regarding the South Texas Projects (STP) alternate and safe shutdown capabilities.

A copy of the list of attendees, the meeting agenda and slides used during the presentation are attached (Attachments 1, 2 & 3 respectively).

HL&P presented the unique STP design features which, in the event of a fire (which disables our safe shutdown path), include the capability to safely shutdown the plant with two redundant pathways rather than one.

The unique design of STP consists chiefly of three redundant trains of safe shutdown capability, each of which is separated from the others by complete fire barriers.

HL&P emphasized that STP is requesting that the NRC Auxiliary Systems Branch (ASB) perform a review to verify the adequacy of the STP safe shutdown capabilities and to provide feedback to the Chemical Engineering Branch (CMEB).

HL&P provided a summary of the most significant points of the STP fire protection design, one of which is the fact that a complete Loss of Offsite Power (LOOP) is assumed for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The NRC staff questioned the acceptability of the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and indicated that they normally require 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for a LOOP in conjunction with a fire.

HL&P committed to review the acceptability of the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> time limit.

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o Houston Lighting & Power Company ST-HL-AE-1217 File No.: G4.2; G9.7 Page 2 If you should have any questions concerning this matter, please contact Mr. Michael E. Powell at (713) 993-1328.

Very truly yours, M. R. Wisenburg Manager, Nuclear Licensing MEP:yd Attachments:

(1) Meeting Agenda (2) List of Meeting Attendees (3) Slides Used During the Meeting W2/NRC1/q

r ST-HL-AE-1227 File No: G4.2; G9.7 Houston Lighting & Power Company -

Page 3 cc:

Hugh L. Thompson, Jr., Director J. B. Poston/A. vonRosenberg Division of Licensing City Public Service Board Office of Nuclear Reactor Regulation P.O. Box 1771 U.S. Nuclear Regulatory Commission San Antonio, TX 78296 Washington, DC 20555 Brian E. Berwick, Esquire Robert D. Martin Assistant Attorney General for Regional Administrator, Region IV the State of Texas Nuclear Regulatory Commission P. O. Box 12548, Capitol Station 611 Ryan Plaza Drive, Suite 1000 Austin, TX 78711 Arlington, TX 76011 Lanny A. Sinkin N. Prasad Kadambi, Project Manager 3022 Porter Street, N.W. #304 U.S. Nuclear Regulatory Ccmmission Washington, D. C.

20008 7920 Norfolk Avenue Bethesda, MD 20814 Oreste R. Pirfo, Esquire Hearing Attorney Claude E. Johnson Office of the Executive Legal Director Senior Resident Inspector /STP U.S. Nuclear Regulatory Commission c/o U.S. Nuclear Regulatory Commission Washington, DC 20555 P. O. Box 910 Bay City, TX 77414 Charles Bechhoefer, Esquire Chairman, Atomic Safety & Licensing Board Dan Carpenter _

U.S. Nuclear Regulatory Commission Resident Inspector / South Texas Project Washington, DC 20555 c/o U.S. Nuclear Regulatory Commission P. O. Box 2010 Dr. James C. Lamb, III Bay City, TX 77414 313 Woodhaven Road Chapel Hill, NC 27514 M. D. Schwarz, Jr., Esquire Baker & Botts Judge Ernest E. Hill One Shell Plaza Hill Associates Houston, TX 77002 210 Montego Drive Danville, CA 94526 J. R. Newman, Esquire Newman & Holtzinger, P.C.

Mr. Ray Goldstein, Esquire 1615 L Street, N.W.

1001 Vaughn Building Washington, DC 20036 807 Brazos Austin, TX 78701 Director, Office of Inspection and Enforcement Citizens for Equitable Utilities, Inc.

U.S. Nuclear Regulatory Commission c/o Ms. Peggy Buchorn Washington, DC 20555 Route 1, Box 1684 Brazoria, TX 77422 E. R. Brooks /R. L. Range Central Power & Light Company Docketing & Service Section P. O. Box 2121 Office of the Secretary Corpus Christi, TX 78403 U.S. Nuclear Regulatory Commission Washington, DC 20555 H. L. Peterson/G. Pokorny City of Austin P. O. Box 1088 Austin, TX 78767 W2/NRC1/q Revised 3/4/85 ST-HL-AE-1227.

i File #:

G4.2/G9.7

' MEETING AGENDA MEETING WITH NRC AUXILIARY SYSTEMS BRANCH (ASB)

-TO DISCUSS STP SAFE-SHUTDOWN SYSTEMS A.

Overall Picture (40 minutes) 1.

3-train System 10 min.

a.

Safe Shutdown Equipment

-b.

Other Safety-related (non-safe shutdown equipment) as SI pumps 2.

Hot Shutdown Systems (Pathways) 10 min.

3.

Cold Shutdown Systems (Pathways) 10 min.

4.

General Physical Arrangement of A,.B, and C trains 10 min.

4 B.

Controls and Instrumentation l

(Control Room / Cable Spreading Room /QDPS) t 1.

Power / Control 15 min.

a.

Control and Transfer Scheme b.

Location of Control Stations l-2.

Instrumentation 15 min.

a.

QDPS Overview b.

Safe S/D Instrumentation & Control Circuits C.

Area by Area Review il (Loss of 1 area -2 remaining pathways) 1.

EAB 30 min.

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MAB 30 min.

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Containment 30 min.

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D.

Overview / Questions 30 min.

W6B/37EA/m

ST-HL-AE-1227

' File No.: G4.2; G9.7 1

. A_ttendees Representing M. E. Powell HL&P E. W. Dotson HL&P C. M. Turner HL&P T. Crawford HL&P R. Sweeney Ebasco J. Braunstein Bechtel R. Gould NRC T. Wambach NRC B. Mann NRC J. Wilson NRC 4

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I Auxiliary Process l

Cabinets Post l

! Class 1E Control Outputs Accident l

Monitoring i

APC i ERF DADS Recorders l

Class 1E A

inputs BurrEnl

. U Protection Cabinets Processing Displays i

Units

~ +

4 A

B Class 1E Control Outputs A

APC i ERF DADS

\\[

Class 1E -

B d _A inputs surreni j,

b Protection Cabinets

\\

\\

Main Control g (\\

Panel

! Class 1E Control Outputs

/

%F i

APC i ERF DADS i

Class 1E C

]

Inputs surreni DPU

+ T I

L Protection Cabinets

\\

i Class 1E Control Outputs

[

l APC S ERF DADS A

Auxiliary

]

Class 1E D

j inputs surreal Shutdown C

Panel L4 Protection Cabinets QDPS 6

i

i l

I l

ODPS SAFE SHUTDOWN DISPLAY j.

-SIGNAL PROCESSING AND DISPLAY OF SAFE SHUTDOWN PARAMETERSIN REDUNDANT FIRE PROTECTED AREAS

-DISPLAYS AVAILABLE AT j

AUXILIARY SHUTDOWN PANEL MAIN CONTROL ROOM l

l CONTROL

!l

-SIGNAL PROCESSING AND MODULATING CONTROL OF SAFE SHUTDOWN EQUIPMENT IN REDUNDANT FIRE PROTECTED AREAS

\\

- CONTROL SELECTED VIA TRANSFER SWITCH BETWEEN AUXILIARY SHUTDOWN PANEL MAIN CONTROL ROOM I

)

i

i i

Data Link to l

m Emergency Response I

g

- Facilities Data Acquisition l

l and Display System l

~

U l

Analog QDPS QDPS Displays l

Q Signal Auxiliary Database i

PT Processing

-+

Process Processing j

V Cabinet Cabinet Unit Main D/L Control

' Existing Panel l

Field Sensor 1 of 4 1 of 4 1 of 2 l

{gg l

Protection Protection Monitoring l

Channels Channels Channels

_f#

Displays l

Auxiliary Data Shutdown O.

Link Panel

' P i

PT Demultiplex to Recorders New (category 1)

Field Sensor (1E)

POST ACCIDENT MONITORING l

l 1

1

PT I

-+

QDPS Analog QDPS

[

Displays m

Field Sensor Auxiliary Signal Database L

(1E)

Process Processing Processing Cabinet Cabinet Unit Main Control Panel 1 of 4 1 of 4 1 of 2

' Protection Protection Monitoring Channels Channels Channels (Physically (Physically Displays Separated)

Separated)

R Auxiliary Shutdown Data Link Panel SHUTDOWN INSTRUMENTATION YlA QDPS

=

I e

1

..i Auxiliary Process i

Cabinets Post l

! Class 1E Control Outputs Accident g

_ Monitoring i

APC i ERF DADS j

Class 1E A

- Recorders l

Inputs surreni g

. l-+ Protection Cabinets Proces;!ng Displays i

Units

' Class 1E Control Outputs

\\

~

Class 1E i \\, M A

inputs surrEnl j g L+ protection Cabinets

\\

Main Control

/

g(

l Pane!

I i Class 1E Control Outputs /

\\

/

j k%F APC

! ERF DADS l

Class 1E C

/

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DU j

j inputs surrent k Protection Cabinets t

l

\\4

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i M

_l

\\

! Class 1E Control Outputs

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APC S ERF DADS A

Auxiliary Class 1E D

~

inputs surFEnl Shutdown C

Panel L-+ Protection Cabineis

~~

QDPS t

~

QDPS i

QUALIFIED CONTROL STEAM GENERATOR' POWER OPERATED RELIEF VALVES l

l

  • REACTOR VESSEL HEAD VENT VALVES i

I e AUXILIARY FEEDWATER FLOW CONTROL LIMITS i

j i

ESSENTIAL COOLING WATER FLOW CONTROL TO SAFETY-RELATED HVAC CHILLERS (TO BE ADDED) i e

V

~

/ConD l

f Trans.

i SW

[

Transfer h

PT Panel Z1 Main l

ODPS J_

) Control Auxiliary

/

Panel Process m

l Cabinet

\\

Protection Channels aMi t

ZT t

k T

v mM Auxiliary l

Shutdown Panel l

SHUTDOWN CONTROL VIA QDPS

1 l

1 l

l l

Cable Chase Cable Chase Cable Chase I

C B

A 1

i l

ODPS OOPS Auxiliary C

A SMhwn PM (DPU)

(DPU) i l

r l

l ODPS i ODPSi ODPS i C

5 l

A l

(APC) 'I (APC)I (APC)I l

l ODPS 1

D (APC) a ll ll ll AUXILIARY SHUTDOWN AREA LAYOUT i

t f

l s

1

l l

l Auxiliary Process Cabinets Post i Class 1E Control Outputs Accident t

- Monitoring i

APC i ERF DADS l

Recorders Class 1E A

. surreal pg, inputs

. L+ protection Cabinets Processing Dispiays Units 4A l

4

.i S Class 1E Control Outputs A

APC S ERF DADS

\\

Class 1E B

4-

M A

inputs BUFFEiij J g L+ protection Cabinets

\\

j

\\

Control g (\\

l Panel

! Class 1E Control Outputs APC i ERF DADS j./

%F Class 1E C

DPU

+T Inputs

.aurrsal b Protection Cabinets

.~

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S Class 1E Control Outputs APC S ERF DADS

/

,,1 A

Auxiliary Class 1E D

~'

Shutdown inputs surreal L+ Protection Cabinets 1

Panel 1

l QDPS i

j ee

9 t

l CONTROL ROOM FVACUATION PHILOSOPHY i

  • MAINTAIN AN OPERATOR IN THE CONTROL ROOM AS LONG AS POSSIBLE -

MANUALLY TRIP REACTOR

  • ALTERNATIVE SHUTDOWN CONTROL LOCATIONS OUTSIDE CR (ASP,SWGR RM, LOCAL CONTROL, ETC) PROVIDE SAFE SHUTDOWN CAPABILITY
  • CONTROL EQUIPMENT (SWGR RMS, QDPS RMS, ETC) FOR REDUNDANT TRAINS OF EQUIPMENT IS PHYSICALLY SEPARATED e REDUNDANTTRAINS OF ESSENTIAL SAFE SHUTDOWN MONITORING INSTRU-l MENTATION ARE PROVIDED ON THE ASP (VIA GDPS) AND ARE ELECTRICALLY j

ISOLATED FROM INSTRUMENTATION IN THE CR r

j i

l 4

f.

CONTHOL TRANSFER PHILOSOPHY

  • CONTROL TRANSFER CAPABillTY IS PROVIDED FOR ALL THREETRAINS OF SAFE SHUTDOWN EQUIPMENT
  • ALTERNATE CONTROLS ARE LOCATED ON THE ASP FOR EQUIPMENT NEEDED i

TO MAINTAIN HOT SHUTDOWN AND WHICH REQUIRES FREQUENT OPERATOR ATTENTION DURING HOTSTANDBY AND DURING THETRANSITIONTO COLD SHUTDOWN

  • ALTERNATE CONTROLS ARE LOCATED IN THE SWGR R.MS FOR EQUIPMENT REQUIRING INFREQUENT OPERATOR ATTENTION
  • LOCAL, MANUAL ACTION MAY BE UTILIZED TO REPOSITION VALVES OR.

VERIFY TANK LEVELS WHEN TIME IS NOT A CRITICAL FACTOR l

g CONTROL TRANSFER SCHEME u

CASP Control?

J V

CONTROL R00H (m) 3 j

CON M NS 110 TOR CONTROL SWITCH l

gg FIELD PREL

(

)

DEVICE CR.

SWITCFEEAR l

HS I

AUXILIARY SIUTDOWN PNEL (ASP)

CONTROL STP FD-J 032

2 1

CONTROL TRANSFER SCHEME (Local ControID L

TRANSFER i

NOTOR CONTROL SWITm j

NTER FIELD m

PREL (NCC)

DEVICE m

7 k

CONTRG. ROOM SWITCHGEAR LOCit. 4 WTROL l

CONTROL 1

'l I

l l

STP FD-2 032 i

l

]

i i

CONTROL LOCAT10NS

/

FOR l

CONTROL ROOM EVACUATION i

PANEL LOCATION j

TRANSFER SWITCH PANELS /

SWITCHGEAR ROOM FOR EACH TRAIN l

AUXILIARY RELAY PANELS /SWGR OIESEL GENERATOR PANELS DIESEL GENERATOR ROOM FOR EACH TRAIN ESSENTIAL CHILLER PANELS ESSENTIAL CHILLER ROOM FOR EACH TRAIN j

i AUXILIARY SHUT 00WN PANEL AUXILIARY SHUT 00WN ROOM (ONE) l '

LOCAL VALVE HAN0 WHEELS MECHANICAL AUXILIARY BUILDING i

1 1

i l

l

.i I

TRANSFER SWITCH PANEL CONTROL

  • ESF BUS BREAKERS
  • CCW HXTEMP CONTROL VLVS l
  • ECW PUMPS
  • 11CFC SUPPLY FANS l
  • HVAC:

l

- RCB CNTMT CUBICLE EXHAUST FANS

- EAB ELEC PENET SPACE EMER AHU's I

- AFW PUMP ROOMS VENT FANS

- EAB BATTERY ROOM EXHAUST FANS

- CHG PUMP AREA C00LER FANS.

- EAE SUPPLY FANS i

l

- BAT PUMP AREA COOLER FANS

- EAB RETURN FANS l

- CCW PUMP AREA COOLER FAN

- DG EMERG VENT FANS

- CVCS VLV CUBICLE ROOM A!!U COOLERS

- ESSEN CHILLED WTR PUMP FANS i.

j-

- ESSENTIAL CHILLER AHU COOLERS l

l l

l

~

i I

i l

1 DIESEL GENERATOR PANEL CONTROL DG STOP/ START DG EMERG. TRIP 1

DG GOVERNOR i

DG VOLTAGE REGULATOR DG OUTPUT BREAKER i

4.16 KV ESF BUS SUPPLY BREAKER

I AUXILIARY SHUTDOWN PANEL CONTROL i

  • AFW PUMPS (MOTOR DRIVEN) j
  • AFW PUMP ISOL VLVS
  • AFW FLOW CONTROL VLVS i

)

  • CHARGING PUMPS
  • LETDOWN STOP & ISOL VLVS j
  • RHR PUMPINLET ISOL VLVS i
  • REACTOR HEAD VENT ISOL & THROTTLE VLVS
  • PRZR BACK-UP HTRS
  • Sl ACCUM DISCH ISOL VLVS

W SIMPLIFIED ELEC AUXILIARY BUILDING l

l G

N 7

N gN w

l PENETRATION AREA

,4 YRAM C t

S d

a PENETRAT10N AREA TRAMB

[

b 7

N d

s PENETRATION AREA q,

TRAIN A t

p-- -,-7.-

0 1

2 P

0 0

0 W M 6

6 6

U 2

2 Z

C P

3 4

5 E

5 5

5 G

N 4

3 I P 2

P 2

1 GM 1

RU Z

D Z

5

?p 6

AP 2

2 2

HC 8

0 9

P 2

4 3

WM 1

1 1

C Z

Z Z

U C

2 9

7 P

0 2

2 R

1 2

3 0

P 0

0 0

0 XT M 4

4 4

4 UW Z

Z Z

2 U

0 9

8 1

AD P F

5 4

4 5

N R

O O

LT 2

1 0

I EA 0

0 0

5 5

5 S R Z

Z Z

T E

E 8

7 6

IDN 3

3 3

A E

G R

R A

A 4

2 2

E M

0 4

5 P

G O 0

O O

HC O Z

Z Z

E 2

3 4

T R 0

0 0

I S

W S

E Y

4 3

3 1

RM 8

4 5

0 R

E O 0

O 0

0 T O Z

Z Z

Z I

T 2

3 4

2 A R 0

0 0

0 F

B N

L O

AI 6

1 6

CT A O

3 4

I A

E O

0 O

RT R R Z

Z Z

2 3

4 C T A 0

0 0

E E LN EE P

G N

6 7

7 EI M 2

4 5

LD O

O 0

O BA AE O Z

Z Z

4 1

5 R

6 3

8 CRPS N

IA A

B C

p R

T I

1 iJ

STP FHAR TABLE'2-1 LOSS OF PO3T-FIRE REDUNDANT SAFE SHUTDOWN CAPABILITY FIRE DESCRIPTION (I)

W SS'OF REDUNDANT CAPABILITY (2)

AREA 2

Train A Switchgear Pressurizer PORV and Power Vault Neutron Flux Indication 3

Train 5 Switchgear Pressurizer PORV 33 Train B Electrical Pressurizer PORV Arsa 37 Diesel Generator B Pressurizer PORY 38 Diesel Generatcr A Pressurizer PORV Neutron Flux Indication 40 DG Storage Tar.k B Pressurizer PORV 41 DC storage Tank A Pressurizar PORV Neutron Flux Indication 46 DG-B HVAC Pressurizer PORV 47 DG-A HVAC Pressurizer PORV Neutron Flux Indication 63, Zone 202 Containment Elev. 68'-0" Cubicle Exhaust Fans 63, Zone 204 Containment Elev. 52'-0" Pressurizer Backup Heaters 63, Zones 216 & 217 Containment Elev. 12'-0" Residual Heat Removal Horth 66 Train A Electrical Area Pressurizer PORV Neutron Flux Indication 68 Train B Electrical Chase Pressutizer PORV 72 Train B Electrical Chase Pressurizer PORV l

I (1) Refer to Chapter 3 for a complete description of the fire areas.

(2) The listing of an item in this column indicates the loss of redundant fire Protected safe shutdown capability. However, minimum safe shutdcan capability,

is still available, i

l l

2-10 o

/

c

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