ML18153D141
| ML18153D141 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 09/30/1992 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 92-583, IEB-92-001, IEB-92-1, NUDOCS 9210080258 | |
| Download: ML18153D141 (9) | |
Text
- e e
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 September 30, 1992 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS 1 AND 2 SURRY POWER STATION UNITS 1 AND 2 Serial No.
NL&P/CGL Docket Nos.
License Nos.
RESPONSE TO NRC BULLETIN 92-01, SUPPLEMENT 1 FAILURE OF THERMO-LAG 330 FIRE BARRIER SYSTEM TO PERFORM ITS SPECIFIED FIRE ENDURANCE FUNCTION 92-583 R2 50-338 50-339 50-280 50-281 NPF-4 NPF-7 DPR-32 DPR-37 On August 28, 1992, the NRC issued Bulletin 92-01, Supplement 1, entitled "Failure of Thermo-Lag 330 Fire Barrier System to Perform Its Specified Fire Endurance Function." The supplement requests actions essentially the same as those identified in Bulletin 92-01, but expands the scope to include all sizes of conduits and trays and to include walls, ceilings, and equipment enclosures.
The response to NRC Bulletin 92-01, Supplement 1 for North Anna and Surry Power Stations is provided in Attachment 1. The locations and descriptions of Thermo-Lag 330 applications at North Anna and Surry are provided in Attachments 2 and 3, respectively.
/-
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PDR, ADOCK 05000280 I!
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The actions being taken by Virginia Electric and Power Company to ensure or restore fire barrier operability have previously been described in Item 3 of Attachment 1 to our response to Bulletin 92-01 (Serial No.92-436), dated July 29, 1992.
If you have questions or require additional information, please contact us.
Very truly yours,
~ l (~U--
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W. L. Stewart Senior Vice President - Nuclear Attachments:
- 1.
Response to NRC Bulletin 92-01, Supplement 1
- 2.
Thermo-Lag 330 Fire Barrier Material - North Anna Power Station
- 3.
Thermo-Lag 330 Fire Barrier Material - Surry Power Station cc:
U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N. W.
Suite 2900 Atlanta, Georgia 30323 Mr. M. S. Lesser NRC Senior Resident Inspector North Anna Power Station Mr. M. W. Branch NRC Senior Resident Inspector Surry Power Station Mr. R. E. Bradley Nuclear Management and Resources Council Suite 300 1776 Eye Street NW Washington, DC 20006
e COMMONWEAL TH OF VIRGINIA )
)
COUNTY OF HENRICO
)
The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by W. L. Stewart who is Senior Vice President -
Nuclear, of Virginia Electric and Power Company. He is duly authorized to execute and file the foregoing document in behalf of that Company, and the statements in the document are true to the best of his knowledge and belief.
Acknowledged before me this 3o1JI day of ~,
19!i..Z_.
My Commission Expires: LA1.a.~. 31
, 19_9!i._.
/{;; ~. !:luoo Notary ublic (SEAL)
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ATTACHMENT 1 RESPONSE TO NRC BULLETIN 92-01, SUPPLEMENT 1 FAILURE OF THERMO-LAG 330 FIRE BARRIER SYSTEM TO PERFORM ITS SPECIFIED FIRE ENDURANCE FUNCTION The requested actions in Bulletin 92-01, Supplement 1 and the responses for North Anna and Surry Power Stations are as follows:
1. For those plants that use either 1-or 3-hour pre-formed Thermo-Lag 330 panels and conduit shapes, identify the areas of the plant which have Thermo-Lag 330 fire barrier material installed and determine the plant areas which use this material for the protection and separation of the safe shutdown capability.
Response
The locations and descriptions of Thermo-Lag 330 applications at North Anna and Surry are provided in Attachments 2 and 3, respectively. Attachment 2, Items 1 through 4, and Attachment 3, Items 1 through 5, identify those areas in which North Anna and Surry use panels and conduit shapes for 1-and 3-hour fire barriers.
Attachments 2 and 3 also identify whether the specific application is addressed by NRC Bulletin 92-01, Supplement 1.
- 2. In those plant areas in which Thermo-Lag fire barriers are used in raceways, walls, ceilings, equipment enclosures, or other areas to protect cable trays, conduits, or separate redundant safe shutdown functions, the licensee should implement, in accordance with plant procedures, the appropriate compensatory measures, such as fire watches, consistent with those that would be implemented by either the plant technical specifications or the operating license for an inoperable fire barrier.
These compensatory measures should remain in place until the licensee can declare the fire barriers operable on the basis of applicable tests which demonstrate successful 1-or 3-hour barrier performance.
Response
In response to Information Notice (IN) 92-55, entitled "Current Fire Endurance Test Results for Thermo-Lag Fire Barrier Material" and dated July 27, 1992, North Anna and Surry implemented compensatory measures (fire watches) for areas in which Thermo-Lag panels are used for 1-or 3-hour fire barriers. For North Anna, these areas were included in the existing hourly fire watch provided for the Thermo-Lag installed on the charging and component cooling pumps. As indicated in our July 29, 1992 response to Bulletin 92-01 (Serial No.92-436), the frequency (i.e., hourly versus continuous) of this fire watch at North Anna is based on the availability of the unaffected charging pumps and component cooling pumps. Based on an
ATTACHMENT 1 (continued)
Engineering Evaluation, Surry implemented a new hourly fire watch for Thermo-Lag on the HVAC ducts in the turbine building. The existing continuous fire watch in the Unit 1 emergency switchgear room and cable vault was expanded to include the Thermo-Lag installed in the mechanical equipment room #3.
No additional compensatory measures were required to be implemented as a result of the issuance of Bulletin 92-01, Supplement 1. Based on Bulletin 92-01 and IN 92-55, both stations had already implemented compensatory measures for 1-and 3-hour Thermo-Lag 330 panels and conduit shapes.
I L e ATTACHMENT 2 e THERMO-LAG 330 FIRE BARRIER MATERIAL NORTH ANNA POWER STATION Thermo-Lag installations addressed by NRC Bulletin 92-01 and Supplement 1 to Bulletin 92-01
- 1.
- 2.
- 3.
- 4.
LOCATION Auxiliary
- Building, Power feed (2. 77 11 armored cable) for component cooling water pump 2-CC-P-lA, el. 244 1-6 11
- Auxiliary
- Building, Power feed (2. 77 11 armored cable) for charging pump 1-CH-P-lC, el. 259 1 -6 11
- Auxiliary Building, Appendix R flexible ventilation duct, elev. 259 1 -6 11
- Auxiliary Building, Piping penetrations Charging Pump Cubicles, elev. 244'-6".
DESCRIPTION Fire retardant coating, 1/2 11 thick preformed sections attached to armored cable.
Fire retardant coating, 1/2 11 thick preformed sections attached to armored cable.
Fire retardant coating, 1/2 11 thick Panels forming fire enclosure around locker containing duct.
Fire barrier (note 2), 1 11 thick panels attached to steel plate.
Thermo-Lag installations not addressed by Bulletin 92-01 or Supplement 1
- 5.
- 6.
- 7.
- 8.
Containment Units 1 and 2, RHR pump motors 1-RH-P-lA &
lB and 2-RH-P-lA & lB, elev.
231 1-6 11
- Containment Uni ts 1 and 2,
the cable penetration to the Fuel Building, elev. 291 '-
0", column 5 (Unit 1) and column 13 (Unit 2).
Containment Unit 1,
transmitters PT-RC-1000 LT-RC-1000, elev. 262 '-10 11,
column 9.
Containment Unit 2,
transmitters LT-RC-2000 LT-2461, elev.
262 '-10 11,
column 6.
Radiant energy
- shield, 1/2 11 thick panels mounted to steel frame to form shield between pump motors.
Radiant energy 1/2" thick panels to a steel frame a
4 sided box penetration.
- shield, mounted to form around Radiant energy
- shield, 1/2" thick panels mounted to a steel frame to form box around transmitters.
Radiant energy
- shield, 1/2 11 thick panels mounted to a steel frame to form box around transmitters.
L
- 9.
- 10.
- 11.
LOCATION Containment Unit 1, conduit 1CX933NB (1. 5 11 )
from PT-RC-1000 LT-RC-1000 to penetration in item 6 above.
Containment Unit 2, conduit 2CX906NV (1.5 11 )
from LT-RC-2000 for 20 1 to column 5 and from column 17 to penetration in item 6 above.
Containment Unit 1, conduit
( 4 11 )
(wide and source range neutron flux indication) elev.
241' -6 11 between columns 4 & 6.
DESCRIPTION Radiant energy
- shield, 1/2 11 thick preformed sections attached to conduit.
Radiant energy
- shield, 1/2 11 thick preformed sections attached to conduit.*
Radiant energy
- shield, 1/2 11 thick preformed sections attached to conduit.
Notes:
- 1.
Radiant energy shields are credited as having 1/2-hour fire rating.
- 2.
- 3.
Fire barriers are credited as having 3-hour fire rating.
Fire retardant coatings are credited as having 1-hour fire rating.
' L ATTACHMENT 3 THERMO-LAG 330 FIRE BARRIER MATERIAL SURRY POWER STATION Thermo-Lag installations addressed by NRC Bulletin 92-01 and Supplement 1 to Bulletin 92-01
- 1.
- 2.
- 3.
- 4.
- 5.
LOCATION Unit 1
Cable
- Vault, communication system conduit 1M912 (1")
1COM3 (3/4")
from elev.
27 '-6" of Auxiliary Building to Unit 1 Emergency switchgear Room.
Unit 1 Emergency Switchgear
- Room, communication system conduits 1SVB151, 1SVB151A,
& 1M912 all (1"); 1COM12 1COM3 both (3/4");
lCOMll (2").
Turbine Building Basement Uni ts 1
2,
HVAC duct between fire dampers 9 & 10 and the Emergency switchgear Room.
Turbine Building Mezzanine Units 1
2, HVAC duct between fire dampers 19 & 20 and the Control Room.
Mechanical Equipment Room
- 3, Charging Pump Service Water Pump supply piping.
DESCRIPTION Fire barrier, 1 11 thick preformed sections attached to conduits for
.entire routing through Cable Vault.
Fire barrier, 1 11 thick preformed sections attached to conduits.
Fire barrier, 1 11 thick panels attached to 4
sides of the ducts.
Fire barrier, 1 11 thick panels attached to 4
sides of the ducts.
Fire barrier, 1 11 thick panel sections protecting piping that enters MER 3 and runs to the CPSW pump room.
Thermo-lag installations not addressed by Bulletin 92-01 or Supplement 1
- 6.
- 7.
Containment Units 1 & 2, RHR pump motors 1-RH-P-lA & lB AND 2-RH-P-lA & lB, elev.
(-)13 1 -0 11
- Containment Unit 1,
transmitters LT-1459A & LT-1461, elev. 18 '-4", column
- 10.
Radiant energy
- shield, 1/2" thick panels mounted to steel frame to form shield between pump motors.
Radiant energy
- shield, 1/2" thick panels mounted to steel frame to form shield between transmitters.
- 8.
- 9.
- 10.
- 11.
- 12.
- 13.
- 14.
Notes:
e ATTACHMENT 3 (continued)
LOCATION Containment Unit 1,
transmitter PT-1449, elev.
(-)3 1 -6 11, column 9.
Containment Unit 2,
transmitter LT-2459A, elev.
18 1-4 11, column 5.
Containment Unit 2,
transmitter LT-2487A, elev.
(-)22 1-6", column 9.
Containments Unit 1
2, Appendix R cable penetration to Cable Vault.
Containment Unit 1, conduit (3/4") from transmitters LT-1459A & PT-1449.
Containment Unit 2, conduit (3/4") from transmitters LT-2459A & LT-2487A.
Cable Vault Uni ts 1
& 2, Appendix R
communication cable containment penetration 4C & 3D.
DESCRIPTION Radiant energy
- shield, 1/2" thick panels mounted to steel frame to form enclosure transmitter.
around Radiant energy
- shield, 1/2" thick panels mounted to steel frame to form enclosure transmitter.
around Radiant energy
- shield, 1/2" thick panels mounted to steel frame to form enclosure transmitter.
around Radiant energy
- shield, 1/2 11 thick panels mounted to steel frame to form 4 sided box around penetration.
Radiant energy
- shield, 1/2" thick preformed sections attached to conduit.
Radiant energy
- shield, 1/2" thick preformed sections attached to conduit.
Radiant energy shield, 1 11 thick panels mounted to steel frame to form 4
sided box around penetration.
- 1.
Radiant Energy Shields are credited as having 1/2-hour fire rating.
- 2.
Fire Barriers are credited as having 3-hour fire rating.