ML20093D520
| ML20093D520 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 10/05/1984 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, John Miller Office of Nuclear Reactor Regulation |
| References | |
| 470, NUDOCS 8410110270 | |
| Download: ML20093D520 (2) | |
Text
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T'IROINIA ELECTRIC AND Powan COMI*ANY RIcnwown, VIRGINIA 20261 W
..L.StuwAnt Vsc P. s s..T October 5, 1984
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4 Mr.' Harold R. Denton,. Director Serial No:
470 Office of Nuclear Reactor Regulation N0/DWL,JPS/lms Attention::Mr. James R. Miller, Chief Docket Nos. 50-338 Operating Reactor Branch No. 3 50-339 Division of Licensing License Nos. NPF-4
.U. S. Nuclear Regulatory Commission NPF-7 Washington, D. C. 20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT NOS. 1 AND 2 SHORTER DURATION TYPE A TESTING REQUIREMENTS In accordance with the North Anna Power Station. Unit Nos. I and 2 Technical Specifications 3/4.6.1.2, the provisions and methods of Appendix J to 10 CFR Part 50 and ANSI N45.4-1972' govern the Type A test duration. ANSI N45.4-1972, Section 7.9, Computation of Leakage Rate-The Absolute Method, states that
" Leakage rates shall therefore be calculated on at least an hourly basis for 24 consecutive hours (or' other agreed upon period)".
-Provisions for shorter duration Type A testing have been approved by the NRC.
These provisions are specified in the Bechtel topical report BN-TOP-1, Revision 1,-November 1972.' These provisions have been used cince 1980 as the basis 'to develop appropriate test acceptance criteria in order to permit shorter duration Type A testing at our Surry Power Station.
Beginning with the current Unit 2 refueling outage, it is our - intent to use the shorter duration test acceptance criteria for North - Anna Units 1 and 2 Type A tests until the ANS 56.8 Standard Committee develops new criteria for shorter duration testing based on the' Mass Point Analysis Method.
North Anna's Type A test acceptance criteria for shorter duration testing is based on the Mass Point Analysis Method as well as on BN-TOP-1 criteria.
If, however, the full 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> duration is performed. only the Mass Point Analysis Method criteria would apply.
The Vepco Integrated Leak Rate' Test computer program contains the required BN-TOP-1 test methodology (Total Time Analysis) as well as the Mass Point Analysis methodology.
This computer program has been used on several Surry Type A tests and the results of this program have been reviewed by NRC Region 1
II inspectors.
0410110270 841005 MS PDR ADOCK 05000338 j
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W[.if VamotwsA Er.scranc Axn Powna COMPANY TO Harold R. Denton Vepco - is _ aware of the _ problems encountered at-the Zion Nuclear Station in their attempts to. perform a shorter duration Type A testing. -Therefore,
-we have reviewed.'our intended test acceptance' criteria and we are confident that'we will_be in compliance with the Type A test duration criteria obtained
!by'the methodology.of BN-TOP-1.
If you have any questions or concerns regarding our approach, please con' tact us at your earliest convenience.
Very truly yours, s
I Wh
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.L-W. L. Stewart ec:
Mr. James P..O'Reilly Regional Administrator Region II U. S. Nuclear Regulatory Commission Mr. Morris'W. Branch' NRC Resident Inspector-North Anna Power Station 4
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