ML20210B164
| ML20210B164 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 02/03/1987 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | Youngblood B NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8702090089 | |
| Download: ML20210B164 (9) | |
Text
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W TENNESSEE VALLEY AUTHORITY CHATTANOOGA TENNESSEE 374o1 SN 157B Lookout Place Fell 031987 U.S. Nuclear Regulatory Commission Attn:
Document Control Desk Office of Nuclear Reactor Regulation Washington, D.C.
20555 Attention:
Mr. B. J. Youngblood In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT - CORRECTIONS TO PREVIOUS SUBMITTALS
References:
1.
Letter from R. Gridley to B. J. Youngblood dated December 23, 1986, " Additional Information on Sequoyah's Equipment Qualification Under Superheat Conditions" 2.
Letter from R. Cridley to B. J. Youngblood dated December 29, 1986, " Electrical Calculations - Final Status Report" 3.
Letter from R. Gridley to B. J. Youngblood dated January 20, 1987, " Division of Nuclear Engineering Design Calculations Efforts" Several recent letters contained errors of omission. contains a copy of Table 2, page 15 and figure 7, which were inadvertently omitted from reference 1. contains a copy of sheet 1/7 from enclosure 2 of reference 2.
This sheet was inadvertently omitted. contains the correct copy of enclosure 2 of reference 3.
An incorrect version was inadvertently transmitted to NRC.
Please note that commitment 2 has been revised.
I apologize for any inconvenience these errors may have caused.
I assure you l
that I have taken measures to prevent a recurrence of these types of problems. All future letters to NRC will receive an independent check for page integrity before submittal.
Very truly yours, TENNESSEE VALLEY AUTHORITY f
. i?.
)R.Gridley, Director Nuclear Safety and Licensing Enclosures cc: See page 2 2090gCK05hh 0 00 g9 g7 AD P
0 27 I I An Equal Opportunity Employer
l 1 U.S. Nuclear Regulatory Comission cc (Enclosures):
U.S. Nuclear Regulatory Comission Region II Attn:
Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. J. J. Holonich Sequoyah Project Manager U.S. Nuclear Regulatory Comission 7020 Norfolk Avenue Bethesda, Maryland 20814 Mr. G. G. Zech, Director TVA Projects U.S. Nuclear Regulatory Comission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Sequoyah Resident Inspector Sequoyah Nuclear Plant P.O. Box 2000 Soddy Daisy, Tennessee 37319 l
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ENCLOSURE 1 34 s
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, Tchlg 2, 15 i' gg 1pment Identification Critical Discussion Number Component
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g" J:nction Boxes 1-JBOX-991-1987-B None 1-JBOX-991-1988-A f
2-JBOX-991-1998-A
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1-JBOX-991-1985-A 1-JBOX-991-3067-8 f*
1-JBOX-991-3114-A f.
1-JBOX-991-3116-B 2-JB0X-991-1986-A 2-JBOX-991-3070-B 2-JBOX-991-3115-A 2-JB0X-991-3117-B 1-JBOX-991-2041-B None 1-JBOX-991-2042-A 1-JBOX-991-2857-B 1-JBOX-991-2858-A 2-JBOX-991-2890-B 2-JBOX-991-2891-A f
2-JBOX-991-2892-B 2-JB0X-991-2893-A 1-JBOX-991-3041-A i
1-JBOX-991-3042-A
}
1-JBOX-991-3061-A L
1-JBOX-991-3065-B b
1-JBOX-991-3066-B f
2-JB0X-991-3062-A 2-JBOX-991-3063-A 2-JB0X-991-3064-A
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2-JBOX-991-3068-B
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2-JBOX-991-3069-B f 4 2-JBOX-991-1997-B 1 F r
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ENCLOSURE 2 8
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SHEET 1/7 SON - SCRS & PIRS FOR ELECTRIC POWER SYSTEM CALCULATIONS SCR SONEEB8607 - PROBLEM:
DEFICIENCIES EXIST WITH RESPECT TO INDIVIDUAL COMP 0NENTS' VOLTAGE IN THE CLASS 1E AUXILIARY PWR SYS.
CORRECTIVE ACTION:
INSTALLATION OF EIGHT NEW CABLES AND EIGHT NEW 80 PERCENT VOLTAGE SOLEN 0ID VALVES.
SCR SONEEB8532 - PROBLEM:
DEFICIENCIES EXIST WITH RESPECT TO INDIVIDUAL COMPONENTS' VOLTAGE IN THE 120VAC VITAL INSTR PWR SYS.
CORRECTIVE ACTION:
PULLING LARGER SIZE CABLE TO REDUCE CABLE IMPEDANCE AND PARALLELING SUPPLY CABLES TO REDUCE CilRRENT THROUGH VARIOUS PORTIONS OF THE AFFECTED CIRCUITS.
SCR SONEEB8605 - PROBLEM:
INADEQUATE MINIMUM DC INPUT VOLTAGE FOR THE UNIT 1 INVERTERS AND 26 MISC SOLEN 0ID VALVES AT MINIMUM BATTERY TERMINAL VOLTAGE.
CORRECTIVE ACTION:
RECERTIFICATION TESTING OF INVERTERS DETERMINED THAT INVERTERS WILL OPERATE PROPERLY WITH AVAILABLE VOLTAGE.
TWENTY-FOUR SOLEN 0 IDS WERE RECATEGORIZED AS NON-REQUIRED AT MINIMUM BATTERY VOLTAGE.
THE REMAINING TWO S0LEN0 IDS WERE CERTIFIED OPERABLE BY THE VENDOR WITH AVAILABLE VOLTAGE.
NO PHYSICAL MODIFICATIONS WERE REQUIRED.
SCR SONEEB8629 - PROBLEM:
DIESEL GENERATOR OVERLOAD DURING BLACK 0UT e CONCURRENT WITH PHASE B CONTAINMENT ISOLATION DUE
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TO RANDOM LOAD BLOCK ADDITION AT T = 30 SECONDS.
CORRECTIVE ACTION:
ADDITION OF TIME DELAY RELAYS TO ENSURE THAT RANDOM LOADING DOES NOT OCCUR SIMULTANE0USLY AT T = 30 SECONDS.
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l ENCLOSURE 3
List of Commitments Made in Enclosure 1 Tennessee Valley Authority - Division of Nuclear Engineering Design Calculation Efforts
- 1. Complete essential calculations efforts for Sequoyah Nuclear Plant, Unit 2 by January 31, 1987, and/or schedule efforts in accordance with restart requirements.
- 2. The MEB calculations review effort for Sequoyah unit 2 will be completed before restart.
- 3. Identify and revise or regenerate, as necessary, CEB essential calculations before restart of Sequoyah Nuclear Plant, unit 2.
- 4. The NEB calculations review effort for Sequoyah unit 2 will be completed before restart.
- 5. The technical audit performed by Engineering Assurance will be completed by January 31, 1987.
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