ML18139B796
| ML18139B796 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 03/09/1982 |
| From: | Leasburg R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Varga S Office of Nuclear Reactor Regulation |
| References | |
| REF-SSINS-6820 329B, IEB-79-01B, IEB-79-1B, NUDOCS 8203160333 | |
| Download: ML18139B796 (2) | |
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R.H.LEASBURO VICE PRESIDENT NUCLEAR OPERATIONS March 9, 1982 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation Attn:
Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Gentlemen:
ADDITIONAL INFORMATION REGARDING THE SAFETY EVALUATION REPORT FOR ENVIRONMENTAL QUALIFICATION OF SAFETY RELATED ELECTRICAL EQUIPMENT CABLE TERMINATIONS AND SPLICES I.E. BULLETIN 79-0lB 90-DAY REVIEW SURRY POWER STATION UNIT 2 This letter provides additional information to our letter Serial No. 329A dated February 24, 1982, regarding cable terminations and splices in the Containment of Surry Unit 2.
In our response to the Safety Evaluation Report on environmental qualification submitted on August 24, 1981, we indicated that, "all terminal blocks in safety-related circuits located inside containment were replaced with quali-fied Raychem splices (WCSF-N)."
During a January, 1982 review meeting with our architect-engineer on the environmental qualification modification project, we discovered that apparently a number of cable terminations on Unit 2 had not been modified.
In response to this information, we conducted a search of our documentation files and made a full-power Unit 2 Containment e~try on February 12, 1982 to check a sample of the circuits.
As a result of the Containment entry, it appeared that a large percentage of the subject cable terminations had not been replaced with the qualified Raychem splices.
In our February 24, 1982 letter to you, we provided our plans to modify the cable terminations in the Unit 2 Containment and justification for continued operation of the unit until the next scheduled outage.
Further assessment of the cable termination matter lead us to the conclusion that Unit 2 should be removed from service as a prudent measure to fully evaluate the manner of cable terminations for the 73 "Master List" Class IE devices.
On February 27, 1982, Unit 2 was removed from service to complete the cable termination work.
During the outage, our investigation determined that 31 of the devices were properly terminated.
These terminations were either by direct cable feedthroughs from the equipment to electrical penetrations or design modifications implemented in 1981 utilizing qualified Raychem splices.
In this outage, Raychem splice material was utilized to terminate 41 of the remaining 42 devices.
Terminations for one inoperable solenoid operated valve will be reworked during the upcoming May 1982 Spring Maintenance Outage.
0203160333 -a20309
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e VIRGINIA ELECTRIC AND POWER COMPANY TO 2
In summary, all terminations identified on the "Master List" will have qualified splices installed when the final SOV is made operable.
This schedule is consistent with the June 1, 1982 implementation date given in I.E. Bulletin 79-0lB.
Our previous statement that the terminations had been completed was based on a misinterpretation of information supplied from the field in preparation of our ".90-Day Response".
The normal review process failed to detect this error.
We believe this is an isolated occurrence and does not reflect an inherent weakness in our review process.
If you require any additional information in this matter, please contact us.
R.H. Leasburg cc:
Mr. Richard C. DeYoung, Director NRC Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D. C. 20555 Mr. Zoltan R. Rosztoczy, Branch Chief NRC Equipment Qualification Branch Division of Engineering Washington, D. C.
20555 Mr. James P. O'Reilly, Regional Administrator Office of Inspection and Enforcement Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 (8 copies)
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