ML18153B419
| ML18153B419 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 12/23/1993 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML18153B420 | List: |
| References | |
| 92-834A, GL-92-08, GL-92-8, IEB-92-001, IEB-92-1, NUDOCS 9401030360 | |
| Download: ML18153B419 (7) | |
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VIRGINIA. ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 December 23~ 1993 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 STATUS OF ACTIVITIES ASSOCIATED WITH THERMO-LAG FIRE BARRIERS Serial No.
NL&P/CGL Docket Nos.
License Nos.
92-834A R1" 50-338 50-339 50-280 50-281 NPF-4 NPF-7 DPR-32 DPR-37 In an April 12, 1993 letter (Serial No.92-834), Virginia Electric and Power Company advised the NRC that the following actions associated with Thermo-lag fire barriers were being taken:
- 1.
Implementation of compensatory measures, as required.
- 2.
Evaluation of the Thermo-Lag fire barrier systems credited as either a one or three hour fire rated barrier system at North Anna and Surry to determine the basis and need for the barrier system.
- 3.
Development of engineering evaluations for those one and three hour fire rated barrier systems not requiring replacement to verify compliance with NRC regulatory requirements.
Such engineering evaluations demonstrate the adequacy of these particular applications.
- 4.
Replacement of one and three hour fire rated barrier systems evaluated as not meeting NRC regulatory requirements. Any new fire barrier systems installed will satisfy NRC regulatory requirements for one and three hour fire rated assemblies, as applicable.
- 5.
Maintenance of compensatory measures documented in our September 30, 1992 response to Bulletin 92-01, Supplement 1 (Serial No.92-583) until the Thermo-lag material is replaced or until an engineering evaluation has been developed to verify compliance with NRC regulatory requirements.
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The purpose of this letter is to provide a status of these activities at North Anna and Surry Power Stations. The attachments list the Thermo-lag applications at both stations and include comments indicating the current status.
To summarize the North Anna information provided in the attachments, Thermo-lag was replaced with 3M lnteram wrap on power cables and gypsum board was added over Thermo-lag in another application. For the remaining Thermo-lag applications at North Anna, engineering evaluations and an addendum to an existing exemption request have been completed. Related to the exemption request addendum, the compensatory measure will be maintained until the NRC approves the addendum.
To summarize the Surry information provided in the attachments, replacement of Thermo-lag with Pyrocrete 241 has been completed for one application. With one exception, engineering evaluations have also been completed for the remaining Thermo-lag applications at Surry. For the one exception, the compensatory measure will be maintained until subsequent plant modifications obviate the need for the affected conduits.
If you have questions regarding this information or require additional information, please contact us.
Very truly yours, R~/J~ Jcr-
- w. L. Stewart Senior Vice President - Nuclear Attachments:
- 1.
Status of Thermo-lag Fire Barrier Material at North Anna Power Station
- 2.
Status of Thermo-lag Fire Barrier Material at Surry Power Station
Enclosures:
- 1.
North Anna Engineering Evaluation 24, entitled "Evaluation of Radiant Energy Shields - North Anna Power Station"
- 2.
North Anna Engineering Evaluation 25, entitled "Evaluation of Existing Fire Enclosure Around Ventilation Duct - North Anna Power Station"
- 3.
Surry Engineering Evaluation 16, entitled "Evaluation of Radiant Energy Shields -
Surry Power Station"
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cc:
U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N. W.
Suite 2900 Atlanta, Georgia 30323 Mr. R. D. Mcwhorter 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 1776 Eye Street, NW Suite 300 Washington, DC 20006
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I ATTACHMENT 1 STATUS OF THERMO-LAG FIRE BARRIER MATERIAL AT NORTH ANNA POWER STATION LOCATION Auxiliary building, power feed (2.77" armored cable) for component cooling water pump 2-CC-P-IA, elev. 244'-6".
Auxiliary building, power feed (2.77" armored cable) for charging pump 1-CH-P-IC, elev. 259'-6".
Containment Units 1 and 2, RHR pump motors 1-RH-P-IA & 18 and 2-RH-P-IA & 18, elev. 231 '-6".
Containment Units 1 and 2, 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", column 9.
Containment Unit 2, transmitters LT-RC-2000 & LT-2461, elev. 262'-1 O", column 6.
Containment Unit 1, conduit ICX933NB (1.5") from PT-RC-1000
& LT-RC-1000 to penetration in forth item above.
Containment Unit 2, conduit 2CX906NV (1.5") from LT-RC-2000 for 20' to column 5 and from column 17 to penetration in forth item above.
Containment Unit 1, conduit (4")
(wide and source range neutron flux indication), elev. 241'-6" between columns 4 & 6.
DESCRIPTION COMMENT Fire retardant coating, 1/2" thick 1
preformed sections attached to armored cable.
Fire retardant coating, 1/2" thick 1
preformed sections attached to armored cable.
Radiant energy shield, 1/2" thick 2
panels mounted to steel frame to form shield between pump motors.
Radiant energy shield, 1/2" thick 2
panels mounted to a steel frame to form a 4 sided box around penetration.
Radiant energy shield, 1 /2" thick 2
panels mounted to a steel frame to form box around transmitters.
Radiant energy shield, 1/2" thick 2
panels mounted to a steel frame to form box around transmitters.
Radiant energy shield, 1 /2" thick 2
preformed sections attached to conduit.
Radiant energy shield, 1 /2" thick ***
2 preformed sections attached to conduit.
Radiant energy shield, 1/2" thick preformed sections attached to conduit.
1 - 1 2
Auxiliary building, Appendix R flexible ventilation duct, elev. 259'-6".
Auxiliary building, charging pump cubicles piping penetrations to radioactive pipe chase, elev. 244'-6".
Comments:
Fire retardant coating, 1" thick 3
panels forming fire enclosure around locker containing duct.
Fire barrier, 1" thick panels attached 4 to steel plate.
- 1. Thermo-lag wrap has been replaced with 3M lnteram wrap.
- 2. Radiant energy shields are credited as having 1/2 hour fire rating. Engineering evaluation 24, which addresses these applications, is enclosed for your information.
- 3. Engineering evaluation 25, which addresses this application, is enclosed for your information.
- 4. Gypsum board was added over the Thermo-lag in the vertical pipe chase. The addendum to Exemption Request 1, transmitted by letter Serial No. 92-6938 (December 11, 1992), addresses the Thermo-lag over steel plates in the remaining piping penetrations. The compensatory measure (fire watch) associated with the exemption request addendum remains in place until the NRC approves the addendum.
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ATTACHMENT 2 STATUS OF THERMO-LAG FIRE BARRIER MATERIAL AT SURRY POWER STATION LOCATION Unit 1 cable vault, communication system conduit 1 M912 (1 ") &
1 COM3 (3/4") from elev. 27'-6" of auxiliary building to Unit 1 emergency switchgear room.
Unit 1 emergency switchgear room, communication system conduits 1SVB151, 1SVB151 A, & 1 M912 (all 1"); 1COM12 & 1COM3 (both 3/4");
1 COM11 (2").
Turbine building basement Units 1
& 2, HVAC duct between fire dampers 9 & 1 O 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.
Unit 1 emergency switchgear room, HVAC duct between fire dampers 1
& 11 and battery room 1 A, dampers 2 & 12 and battery room 1 B.
Unit 2 emergency switchgear room, HVAC duct between fire dampers 3
& 13 and battery room 2A.
Containment Units 1 & 2, RHR pump motors 1-RH-P-1A & 1 Band 2-RH-P-1A & 1 B, elev. (-)13'-0".
DESCRIPTION COMMENT Fire barrier, 1" thick preformed 1
sections attached to conduits for entire routing through cable vault.
Fire barrier, 1" thick preformed 2
sections attached to conduits.
Fire barrier, 1" thick panels 3
attached to 4 sides of the ducts.
Fire barrier, 1" thick panels 3
attached to 4 sides of the ducts.
Fire barrier, 1" thick panel sections 4
protecting fiberglass piping that enters MER 3 and runs to the CPSW pump room.
Fire barrier, 1" thick panels attached to 4 sides of the ducts.
Fire barrier, 1" thick panels attached to 4 sides of the ducts.
Radiant energy shield, 1/2" thick panels mounted to steel frame to form shield between pump motors.
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Containment Unit 1, transmitters Radiant energy shield, 1 /2" thick 5
LT-1459A & LT-1461, elev. 18'-4",
panels mounted to steel frame to column 10.
form shield between transmitters.
Containment Unit 1, transmitter Radiant energy shield, 1 /2" thick 5
PT-1449, elev. (-)3'-6", column 9.
panels mounted to steel frame to form enclosure around transmitter.
Containment Unit 2, transmitter Radiant energy shield, 1 /2" thick 5
L T-2459A, elev. 18'-4", column 5.
panels mounted to steel frame to form enclosure around transmitter.
Containment Unit 2, transmitter Radiant energy shield, 1 /2" thick 5
L T-2487A, elev. (-)22'-6", column 9.
panels mounted to steel frame to form enclosure around transmitter.
Containment Units 1 & 2, Appendix R Radiant energy shield, 1 /2" thick 5
cable penetration to Cable Vault.
panels mounted to steel frame to form 4 sided box around penetration.
Containment Unit 1, conduit (3/4")
Radiant energy shield, 1 /2" thick 5
from transmitters LT-1459A &
preformed sections attached to PT-1449.
conduit.
Containment Unit 2, conduit (3/4")
Radiant energy shield, 1 /2" thick 5
from transmitters LT-2459A &
preformed sections attached to LT-2487A.
conduit.
Cable vault Units 1 & 2, Appendix R Radiant energy shield, 1" thick 5
communication cable containment panels mounted to steel frame to penetrations 4C & 30.
form 4 sided box around penetration.
Comments:
- 1. Engineering evaluation 23, transmitted by letter Serial No.92-834 (April 12, 1993),
addressed this wrap.
This wrap and conduit will be abandoned in place or removed when the new communication system becomes operational in 1994.
- 2. This wrap and conduit will be abandoned in place or removed when the new communication system becomes operational in 1994. The compensatory measure (fire watch) remains in place until that time.
- 3. Engineering evaluation 22, transmitted by letter Serial No.92-834 (April 12, 1993),
addresses this wrap.
- 4. Pyrocrete 241 has been installed over the Thermo-lag to meet the 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rating.
Therefore, no credit will be taken for the Thermo-lag.
- 5. Radiant energy shields are credited as having 1/2 hour fire rating. Engineering evaluation 16, which addresses these applications, is enclosed for your information.
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