ML20052H978
| ML20052H978 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 05/18/1982 |
| From: | Leasburg R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Clark R, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 308, NUDOCS 8205240268 | |
| Download: ML20052H978 (4) | |
Text
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VIRGINIA ELecruic ann POWER COMPANY Hicnixoxo, VantoINIA 20261 i
H.H.LEAMEUNG v.c. v...... n May 18, 1982 Noct.Au Orr massume i
Mr. Harold R. Denton, Director Serial No. 308 Office of Nuclear Reactor Regulation N0/3GE:ms Attn:
Mr. Robert A. Clark, Chief Docket Nos. 50-338 Operating Reactors Branch No. 3 50-339 Division of Licensing License Nos. NPF-4 U. S. Nucletir Regulatory Commission NPF-7 Washington, D. C.
20555 Gentlemen:
TURBINE DISC INSPECTION SCHEDULE NORTH ANNA POWER STATION - UNITS 1 AND 2 In legal papers filed with the Atomic Safety and Licensing Appeal Board, Virginia Electric and Power Company has, at least by implication, agreed to inspect the turbine discs at its North Anna Power Station for cracking on a schedule to be determined by criteria developed by the Westinghouse Electric Corporation, the turbine vendor.
This letter constitutes Vepco's commitment to that effect.
Vepco will perform an ultrasonic inspection of the discs on the low pressure turbines at North Anna Units 1 and 2 on a schedule calculated by Westinghouse i
in accordance with Westinghouse's " Criteria For Low Pressure Nuclear Turbine Dise Inspection," MSTG-1-P, which was Applicant's Exhibit V-1 submitted to the Appeal Board.
Unless the NRC Staff first approves an alternative basis, i
Vepco will base its inspection intervals on the disc that gives the shortest interval for the Unit involved regardless of whether that disc would be contained by the casing in the event it were to generate a turbine missile.
This means that the next inspection of the turbine discs will take place 34.9 operating months after the last inspection for Unit I and 32.5 operating months for Unit 2, as indicated in the attached letter from Westinghouse of January 26, 1982.
As we pointed out in our letter to Mr. Harold R. Denton of September 22, 1981, Serial No. 546 (Applicant's Exhibit No. V-5 submitted to the Appeal Board),
the calculated inspection intervals may on occasion be less than or longer than a scheduled fuel cycle.
In that event Vepco will seek Westinghouse's guidance for scheduling the next inspection so as to coincide with a scheduled outage.
Vepco will not operate beyond any calculated inspection interval (based on the worst-case disc, contained or not) without first obtaining an j
extension from the NRC Staff.
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oI 8205240268 820518 PDR ADOCK 05000338 l
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2 Viuotw as 1.1.rcinic no Powr.m cous*4NY To Vepco plans to submit in mid-1982 an updated FSAR for North Anna Units 1 and 2 (in accordance with 10CFR50) that will describe the Westinghouse inspection criteria.
If you require any additional information, please let us know.
Very truly y rs, fik R. H. Leasburg Attachment cc:
Mr. Richard C. DeYoung, Director Office of Inspection and Enforcement Washington, D. C.
20555 Mr. James P. O'Reilly, Regional Administrator Office of Inspection and Enforcement Region II Atlanta, Georgia 30303 Judge Alan S. Rosenthal Daniel P. Swanson, Esq.
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LJ Westinghouse Power Generation s'en tene 0;.ise Electric Corporation Group tester e avBa sits PMa2cna penns>'ia,J 19113 January 26, 1982 Mr. S. Eccles Virginia Electric & Power Company Nuclear Operations P. O. Box 26666 Richmond, VA 23261 Re:
Inspection Intervals for VEPC0 North Anna #1 & #2 l
Dear Si:
l Please refer to my letter to you dated October 7,1981 outlining low pressure l
disc inspection intervals which comply with the NRC criterion. As per our telephone discussion on January 20, 1982, the final numbers based on our com-puter program have slightly changed. The following is the revised table #1 inspection intervals.
I North Anna #1 LP #1 (Original Rotor Test No. TN1248) l DISC END DISC TEST NO.
TIME, MONTHS 1
GVN TN1302 35.79 1
GNH TN1301 42.93 2
GVN TN1362 43.47 2
GNN TN1361 43.30 LP #2 (GPU 3 Mile Island Rotor Test No. TN1243) 1 GVN TN1612 47.10 1
GNN TN1610 34.88 2
GVN TN1618 52.31
,2 GNN TN1927 46.20
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o Mr. S. Eccles Page 2 January 26, 1982 North Anna #2 LP #1 (Rotor Test No. TN6125)
DISC END DISC TEST NO.
TIME, MONTHS 1
GVN TN6120 32.46 1
GNN TN6063 41.13 2
GVN TN1902 43.33 2
GNN TN1891 54.18 LP 's (Rotor Test No. TN1759) 1 GVN TN1928 42.50 1
GNN TN1924 46.15 2
GVN TN1898 45.91 2
GNN TN1923 39.93 If you require any additional information, please let me know.
Sincerely.
Mr g,
S. J. Niermont, Jr.
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Project En9 neer t
Eastern Area
- dfs cc: Mr. F. R. Vacarro G205 Mr. J. D. Dickinson G203 Mr. R. Parr G203 Mr. C. Patrick 00810 Richmond PGSD Mr. T. Sinback 00810 Richmond PSFS 1
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