ML20086S912
| ML20086S912 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 12/23/1991 |
| From: | Beecken R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-88-20, NUDOCS 9201060058 | |
| Download: ML20086S912 (4) | |
Text
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- n December 23, 1991 U.S. Nuclear Regulatory Coimrission ATTN:
Document Control Desk Wasnington, 0.0.
20555 Gent len.en:
- n the Matter af
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Locket Nos. 50-327 Tennessee Valiey Authority
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50-328 SEQUQYAH NUCLEAR PLANT (SGN) - OENERIC LETTER (3L) SS-;C, ;UPPLEMENT 4,
"!NDIV:CUAL PLA',. EXAMINA!!CN OF EXTERNA 1. EVENTS (!?EEE) FOR SEVERE ACCIDENT Vl'LNERAEIL:!!ES - 1) CFR 50.54(f)"
The purpose.:f :his letter is to transmit SQN's review metr.odelegy and schedule to implement the subject GL.
The following paragraphs delineate the information requested.
1.
Seismic Events Electric Power Research Institute (EPRI) NP-604l, "A Methodolo6y for Assessment of Nuclear Power Plant Seismic Margin," will be utilized for
- he evaluaticn of seismic events.
SQN will also use the supplemental guidance provided in NUREG-lLO7 as requested.
It is car intent to perform a ecmplete seismic evaluatien, using the method previously stated, for tne
- PEEE for one of the two SQN units, and only perform seismic walkdowns and unit unique calculations for the ether SQN unit.
2.
Internal Fires The Fire-Induced Vulnerability Evaluation (FIVE) methodolcgy wil'1 be utilized for the evaluation of internal fires.
SQN App. Jix R work will be a starting point for the evaluation utilizing the F;VE methodology.
- 3.
External Floods, High Winds and Tornadoes. Iransportation, Nearby Facility Accidents, and 3ther External Events t
The screening type apercach as described in the subject GL and VUREG-1407 will be used to further evaluate these external events.
l Nh I 9201060058 911223 (i V I
g PDR ADOOK 05000127 i
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U.S. Nuclear Regulatory Commission Page 2 December 23, 1991 Based spcn the following discussion, we plan to submit the results of the SQN :FEEE by December 18, li96.
This date is approximately eight months after the " nit i Cycle 8 refueling outage.
(The L'ni t 1 Cycle 5 refueling outage was completed on December 14
- 991, and the
'.'ni t 2 Cycle 5 refueling outage is scheduled for March of 1992.)
Preparation for this work will begin af ter completion of the " Individual Plant Examination For Severe Accident Vulnerabilities" iGL 38-20 ),
currently scheduled for September 1, 1992.
This tenedule will allcw SQN tone ci three !VA sites currently responding to the sucject GL) to utilize perranent plant personnel to the maximum extent possible by leveling resources elative to outage period demands.
One refueling mutage is not anticipated to be sufficient to complete the walkdowns required f or the 1PEEE f or equipment inside containment for the safe-shutdown paths and containment integrity.
The walkdowns insice containment will aegin with Unit 2 :ycle 9 And end witn " nit 1 Cycle S refueling outages.
Eva;uation cf the walkdcwn data.i;l te performed between cutages to minimize the work impact during cutage periods.
The second outage will allow the walkdewn teams to revisit :cmponents for verification inspections and conduct additional wa;kcewns that may be identified after the tirst outage.
The commitment contained in this submittal is provided en the attached enclosure, Please direct questions concerning this is sue to '4.
C. Ludvig at (615) 543-7460.
Sincerely, s'
d:'
y J. Seecken
- la t Manager d subsc*ibed bg] fore me Sworn to thj,s "
h!] f 1991 day of I Al//1 Y N Adi -
Notary PublicV~ / g"ddt4%
i-My Commission Expires
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Enclosure cc: See page 3
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U.S. Nuclear Regulatory Commission Page 3 December 23, 1991 Enciasure Oc (Enclosure):
Mr. D. E. LaBarge. ?roject Manager U.S. Nuclear Regulatary :cmmission One White Flint. ':crth 11555 Rockville Pike Rockville, Marylar.d 20852 NRC Resident !nspe: tar Sequoyah Nuclear :lant 2600 Igou Ferry Rcad Soddy Daisy, Tennessee 37379
- fr. 3. A. Wilson, Project Chief U.S. Nuclear Regulatory Commission Regian II 101 Marietta street, NW, suite 2900 Atlanta, 3eorgia 33323
ENCLOSURE C05StITMEh! TOR GENERIC LETTER 88-00, SUPPLEMENT L,
"!NDIVIDUAL PLANT EXAMINATION OF EXTERNAL EVENTS +:PEEE)
FOR SEVERE ACCIDENT VULNERASI'.!!!ES - 10 CFR 50.5L(f )"
Sequoyan Nuclear Plant will transmit the Units 1 and 2 !PEEE to NRC by December LS, 1996.
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