ML19095A445
| ML19095A445 | |
| 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: ML19095A445 (3) | |
Text
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VIRGINIA ELEC:'i:RIC.A.ND POWER *coMPAN~-.' si' RIOHMOND,VIRGINI.A 23261
- oecember7; 1977 Mr. James -P. O'Reilly, Director Office of Inspection and Enforcement
- u. s. Nuclear Regulatory* Commission Region II 230 Peachtree St~eet, Northwest Atlanta, Georgia 30303
Dear Mr. O'Reiily:
Serial No.** 529/111877 LQA/JEE:jal *.
Docket Nose 50-280 50-281 Thi~ letter is in response to IE l3ulletin Nos*. 77-05 and* 77-0SA and Mr. Case's letter' of November 18, 1977*, concerning environmental
_ qualifications of elect~ical connectors subject to an accident environ-ment and are required to be operable during an accident.
A_ s1;:udy has
- been conducted and we have.found that the.only electrical con~ectors 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.a~d turbine trip within the first a~conda well before accident.radiation levels are.reached or the commencement of caustic sprays. therefore, these connectors (manufactured.by Amphenol)'
- w~uld 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 present'ed~
- 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 abiove-.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..
Attachment
- cc:
Mr.. Robert w. Reid/
. Very
- truly yours,.
. _ Zp_ )/)?. \\,dl/dh;~ 7r
- C. M *. Stallings
- Vice President-Power Supply and Production Operations
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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.SM~.
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