ML19095A443
| ML19095A443 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 12/07/1977 |
| From: | Stallings C Virginia Electric & Power Co (VEPCO) |
| To: | O'Reilly J NRC/RGN-II |
| References | |
| IEB-77-005, IEB-77-005A, Serial No. 529/111877 | |
| Download: ML19095A443 (2) | |
Text
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VIROINlA -
~ LECTRIC.AND OWER OMPANY
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RICHMOND,Vl:RGINIA 23261
~~~
December 7, 1977 Mr. James P. O'Reilly, Director Office of Inspection and Enforcement U. _s. Nuclear Regulatory Commission Region II 230 Peachtree Street, Northwest Atlanta, Georgia 30303
Dear Mr. O'Reilly:
Serial No. 529/111877 LQA/JEE:jal Docket Nos This letter is in response to IE Bulletin Nos. 77~05 and 77-05A and Mr. Case's letter of November 18, 1977, concerning environmental qualifications of electrical connectors subject to an accident environ-ment and are required to be operable during an accident.
A study has been conducted and we have found that the only electrical connectors required for safety are the channels needed for reactor trip during a LOCA - low pressurizer level and low pressurizer pressure.
These channels would actuate a reactor and turbine trip within the first seconds well before accident radiation levels are reached or the commencement of caustic sprays, therefore, these connectors (manufactured by Amphenol) would not be exposed to high radiation or caustic sprays before their function was completed.
On November 16, 1977, our Messrs. W. F. Bennett and J.M. Davis met with Messrs *. T. A. Ippolito and M. B. Fairtile when test results on the Amphenol connectors for accident steam, temperature, and pressure conditions were presented.
The staff found the results acceptable.
A brief description of the test is attached.
It is our conclusion that no other electrical connectors inside or outside the containment would be required to function during an accident.
The Amphenol Connectors described above will not be required to operate beyond the first seconds into the accident before further degradation of the containment environment and would not compromise the operation of safety-related equipment.
AttacJunent cc:
Mr. Robert W. Reid Very truly yours,
- u. 221. ~itC:/~J,:J/
C *. M. Stallings Vice President-Power Supply and Production Operations
~-
DESCRIPTION OF TEST Amphenol Connectors used at Surry Units 1 and 2:
- 1.
280°F at 60 psia for 60 min.
- 2.
140-150°F at atmospheric for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
RESULTS:
Insulation Resistance never fell below 34.SMQ.
I