ML20247E258
| ML20247E258 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 03/23/1989 |
| From: | Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 89-102, NUDOCS 8904030013 | |
| Download: ML20247E258 (2) | |
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j VIROINIA ELECTRIC AND POWER COMIWNY RICIIMOND,VIItOINIA 20261
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March 23, 1989 Vace Passinant N UCf.B AS J
United States Nuclear Regulatory Commission Serial No.89-102 Attention: Document Control Desk N0/JBL:jmj R0 Washington, D.C.
20555 Docket Nos.
50-338 50-339 License Nos.
NPF-4 NPF-7 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY E RTH ANNA POWER STATION UNITS 1 AND 2 Q0NTAINMENT LINER TEST CHANNELS The purpose of this letter is to inform you that Virginia Electric and Power Company has evaluated the containment liner weld test channels with test channel plugs installed for North Anna Units 1 and 2 as a leaktight structural boundary.
This evaluation was prompted by the results of an NRC Containment Integrated Leak Rate Test (CILRT) Procedure Review conducted at Surry Power Station.
The North-Anna evaluation determined that the containment liner weld test channels were provided primarily for the testing of the liner seam weids during construction and were not designed as part of the leaktight memorane.
However, they are completely compatible with the liner and provide the same degree of leak tightness.
The test channels are capable of withstanding all loads that i..!ght be imposed on them during the CILRT and Design Basis Accident (DBA) conditions without any loss of integrity.
Thi containment lir.er weid test channels do nct impair the performance of the containment liner and do not impose a physical constraint such that a discontinuity could be considered to exist.
The reference North Anna test channel evaluation was performed with the identical methodology used to prepare the Surry evaluation which was submitted on August 5, 1988 and approved by the NRC on March 6, IS89. Although the ASME Section III edition and addenda used as a guide for design and construction practices and the material specification used for the containment liners at North Anna differ from those used in the Surry evaluation, the evaluation results are the same.
The evaluation concluded that sufficient justification exists to support our decision not to vent the containment liner weld test channels during CILRTs.
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~w-The Station Nuclear Safety and Operating Committee has reviewed the North Anna containment liner weld - test channel evaluation and - determined that an unreviewed safety question does' not exist for plant operations or containment leak rate testing with the containment liner weld test channels and test channel plugs installed.
The North Anna containment liner weld test channel evaluation is available for review.
If you have any questions, please contact us.
- Very trul yo s,
W. R. Cartwri ht
.cc:
U. S.- Nuclear Regulatory Commission 101 Marietta Street, N.W.
Suite 2900 Atlanta, GA 30323 Mr. J. L. Caldwell NRC' Senior Resident Inspector North Anna Power Station l
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