GO2-07-079, Response to Generic Letter 2007-01, Inaccessible or Underground Power Cable Failures That Disable Accident Mitigation Systems or Cause Plant Transients.
| ML071300360 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 05/01/2007 |
| From: | Oxenford W Energy Northwest |
| To: | Document Control Desk, NRC/NRR/ADRO |
| References | |
| GL-07-001, GO2-07-079 | |
| Download: ML071300360 (3) | |
Text
ENERGY NORTHWEST People *V~sion -Solutions P.O. Box 968
- Richland, WA
- 99352-0968 May 1, 2007 G02-07-079 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001
Subject:
COLUMBIA GENERATING STATION, DOCKET NO. 50-397 RESPONSE TO GENERIC LETTER 2007-01, "INACCESSIBLE OR UNDERGROUND POWER CABLE FAILURES THAT DISABLE ACCIDENT MITIGATION SYSTEMS OR CAUSE PLANT TRANSIENTS"
Dear Sir or Madam:
On February 7,, 20079 the NRC issued Generic Letter (GL) 2007-01 to request that licensees suibmit informhation related to inaccessible or underground cabling. Provided in the attaChment to this, letter is Enehdrgy Northwest's response.
Energy 'Northwest makes no new commitments by this letter. If you have any questions or require additional information, please contact Mr. GV Cullen at (509) 377-6105.
I declare under penalty of perjury that the foregoing is true and correct. Executed on the date of this letter.
RespectfulIly, Vice Pres dent, Tec 'cal Services Mail Dro PEO
Attachment:
Generic Letter 2007-01 Requested Information cc: BS M6lletft -` NRC RIV':
CF Lyon - NRC NRR NRC Senior Resident Inspector/988C.
,ý-RN Shermi~n`-IBPA/11399'---
WA Horin - Winston& StraWn,"
.... "5'*°'AW
RESPONSE TO GENERIC LETTER 2007-01, "INACCESSIBLE OR UNDERGROUND POWER CABLE FAILURES THAT DISABLE ACCIDENT MITIGATION SYSTEMS OR CAUSE PLANT TRANSIENTS" Attachment Page 1 of 2 Generic Letter 2007-01 Requested Information NRC Request #1 Provide a history of inaccessible or underground power cable failures for all cables that are within the scope of 10 CFR 50.65 (the Maintenance Rule) and for all voltage levels.
Indicate the type, manufacturer, date of failure, type of service, voltage class, years of service, and the root causes for the failure.
Energy Northwest Response The following is a history of inaccessible or underground power cable failures at Columbia Generating Station (CGS) that are scoped within the Maintenance Rule and where voltages are greater than or equal to 480V:
Circulating Water Cooling Circulating Water Cooling Circulating Water Pump 1C Fan 33 Motor Power Cable Fan 32 Motor Power Cable Motor Power Cable*
Type FlamtrolTM insulation over tin- FlamtrolTM insulation over tin- Semi-conR insulation over coated copper stranding, not coated copper stranding, not copper conductors, Shield is shielded shielded tin plated wound copper tape, Jacket material is OkoguardR shielded OkolonR Manufacturer Raychem Raychem Okonite Date of February 20, 2005 February 17, 2005 **Sept-Oct 1986 Failure Type of normally energized normally energized normally energized Service (Cable #AM5M-0050 to (Cable #AM5M-0040 to (Cable #ASM3-0070 to CW-FN-33) CW-FN-32) CW-P-1 C)
Voltage Nominal Service Voltage - Nominal Service Voltage - Nominal Service Voltage -
Class 480 VAC 480 VAC 4160 VAC Cable Rating - 600V Cable Rating - 600V Cable Rating - 5000V Years Serviceof approx 22 years approx 22 years approx 3 years Failure Root In service failure, cause In service failure, cause In service failure, ampacity Cause undetermined - most likely undetermined - most likely overheating effects due to cable damage during due to cable damage during (TER 02-86-0569-0) installation and water intrusion installation and water intrusion (PER 205-0110) (PER 205-0103)
- Review of power cables to Circulating Water pumps 1A and 1B following failure of IC also indicated some overheating so they were changed out at the same time with higher ampacity rated cable.
- The existing records do not provide a date of failure but indicate a general timeframe that the failure occurred.
NRC Request #2 Describe inspection, testing and monitoring programs to detect the degradation of inaccessible or underground power cables that support EDGs, offsite power, ESW, service water, component cooling water and other systems that are within the scope of 10 CFR 50.65 (the Maintenance Rule).
RESPONSE TO GENERIC LETTER 2007-01, "INACCESSIBLE OR UNDERGROUND POWER CABLE FAILURES THAT DISABLE ACCIDENT MITIGATION SYSTEMS OR CAUSE PLANT TRANSIENTS" Attachment Page 2 of 2 Energy Northwest Response There is no formal program at CGS for inspection, testing, or monitoring of inaccessible or underground cabling to detect degradation. Periodic testing may occur to perform meggering of certain components, but it is not part of a formal program.
Text
ENERGY NORTHWEST People *V~sion -Solutions P.O. Box 968
- Richland, WA
- 99352-0968 May 1, 2007 G02-07-079 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001
Subject:
COLUMBIA GENERATING STATION, DOCKET NO. 50-397 RESPONSE TO GENERIC LETTER 2007-01, "INACCESSIBLE OR UNDERGROUND POWER CABLE FAILURES THAT DISABLE ACCIDENT MITIGATION SYSTEMS OR CAUSE PLANT TRANSIENTS"
Dear Sir or Madam:
On February 7,, 20079 the NRC issued Generic Letter (GL) 2007-01 to request that licensees suibmit informhation related to inaccessible or underground cabling. Provided in the attaChment to this, letter is Enehdrgy Northwest's response.
Energy 'Northwest makes no new commitments by this letter. If you have any questions or require additional information, please contact Mr. GV Cullen at (509) 377-6105.
I declare under penalty of perjury that the foregoing is true and correct. Executed on the date of this letter.
RespectfulIly, Vice Pres dent, Tec 'cal Services Mail Dro PEO
Attachment:
Generic Letter 2007-01 Requested Information cc: BS M6lletft -` NRC RIV':
CF Lyon - NRC NRR NRC Senior Resident Inspector/988C.
,ý-RN Shermi~n`-IBPA/11399'---
WA Horin - Winston& StraWn,"
.... "5'*°'AW
RESPONSE TO GENERIC LETTER 2007-01, "INACCESSIBLE OR UNDERGROUND POWER CABLE FAILURES THAT DISABLE ACCIDENT MITIGATION SYSTEMS OR CAUSE PLANT TRANSIENTS" Attachment Page 1 of 2 Generic Letter 2007-01 Requested Information NRC Request #1 Provide a history of inaccessible or underground power cable failures for all cables that are within the scope of 10 CFR 50.65 (the Maintenance Rule) and for all voltage levels.
Indicate the type, manufacturer, date of failure, type of service, voltage class, years of service, and the root causes for the failure.
Energy Northwest Response The following is a history of inaccessible or underground power cable failures at Columbia Generating Station (CGS) that are scoped within the Maintenance Rule and where voltages are greater than or equal to 480V:
Circulating Water Cooling Circulating Water Cooling Circulating Water Pump 1C Fan 33 Motor Power Cable Fan 32 Motor Power Cable Motor Power Cable*
Type FlamtrolTM insulation over tin- FlamtrolTM insulation over tin- Semi-conR insulation over coated copper stranding, not coated copper stranding, not copper conductors, Shield is shielded shielded tin plated wound copper tape, Jacket material is OkoguardR shielded OkolonR Manufacturer Raychem Raychem Okonite Date of February 20, 2005 February 17, 2005 **Sept-Oct 1986 Failure Type of normally energized normally energized normally energized Service (Cable #AM5M-0050 to (Cable #AM5M-0040 to (Cable #ASM3-0070 to CW-FN-33) CW-FN-32) CW-P-1 C)
Voltage Nominal Service Voltage - Nominal Service Voltage - Nominal Service Voltage -
Class 480 VAC 480 VAC 4160 VAC Cable Rating - 600V Cable Rating - 600V Cable Rating - 5000V Years Serviceof approx 22 years approx 22 years approx 3 years Failure Root In service failure, cause In service failure, cause In service failure, ampacity Cause undetermined - most likely undetermined - most likely overheating effects due to cable damage during due to cable damage during (TER 02-86-0569-0) installation and water intrusion installation and water intrusion (PER 205-0110) (PER 205-0103)
- Review of power cables to Circulating Water pumps 1A and 1B following failure of IC also indicated some overheating so they were changed out at the same time with higher ampacity rated cable.
- The existing records do not provide a date of failure but indicate a general timeframe that the failure occurred.
NRC Request #2 Describe inspection, testing and monitoring programs to detect the degradation of inaccessible or underground power cables that support EDGs, offsite power, ESW, service water, component cooling water and other systems that are within the scope of 10 CFR 50.65 (the Maintenance Rule).
RESPONSE TO GENERIC LETTER 2007-01, "INACCESSIBLE OR UNDERGROUND POWER CABLE FAILURES THAT DISABLE ACCIDENT MITIGATION SYSTEMS OR CAUSE PLANT TRANSIENTS" Attachment Page 2 of 2 Energy Northwest Response There is no formal program at CGS for inspection, testing, or monitoring of inaccessible or underground cabling to detect degradation. Periodic testing may occur to perform meggering of certain components, but it is not part of a formal program.