ML19093B015
| ML19093B015 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 08/05/1977 |
| From: | Stallings C Virginia Electric & Power Co (VEPCO) |
| To: | Case E, Reid R Office of Nuclear Reactor Regulation |
| References | |
| Download: ML19093B015 (2) | |
Text
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VIRGINIA ELECTRIC AND POWER COMPANY RIOHMOND, VIRGINIA 23261 August 5, 1977,
Mr. Edson G. Case, Acting Director Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Attention: Mr. Robert W. Reid, Chief Operating Reactors Branch No. 4
Dear Mr. Case:
Docket Nos.
License Nos. DPR-32 DPR-37 This letter is a result of our continuing efforts in minimizing the pro-bability of release during a postulated fuel handling accident in containment.
We have found that by modifying the purge valve relay closing circuit, so that it fails in the safe direction on loss of power, we can eliminate our worst single failure case (Case 3).
Therefore, even with a single failure, we do not require the filters to be operable to maintain the postulated release within the limits of 10 CFRlOO.
We are pursuing this design change and request that ycm de-lete from our previous letter the Case 3 analysis and the subsequent proposed (for study) Technical Specification change (T.S.3.11.B.10.b) on the.frequency of filter surveillance.
During discussions with your staff, it was requested that we state the me-thod of seismically qualifying our radiation monitors.
The facts are as follows:
- 1)
Initially, the requirement that the monitors must now be seismically qualified was stated.
- 2)
We contacted our Architect Engineer and the radiation monitor Vendor and found that since the qualification for the monitors had not been required, it was not issued.
However, it was stated that identical radiation monitor design had been seismically qualified, but that the mounting would have to be analyzed.
- 3)
Initial analysis showed that the mounting was qualified.but further study would be required to assure that the interconnecting tubing, etc. was also qualified.
- 4)
Both the AE and the vendor are pursuing the final analysis.
When the results are firm, if any changes are required, they will be made.
\\.
VIRGINIA ELECTRIC AND POWER COMPANY TO Mr. Edson G. Case Page No. 2 We will continue to.keep you updated on our progress.
cc:
Mr. James P. O'Reilly Vice and Very truly yours,
~~r-c-
- c. M. Stallings President-Power Supply Production Operations