ML20002C992
| ML20002C992 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 09/10/1969 |
| From: | Haueter R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Morris P, Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8101150682 | |
| Download: ML20002C992 (3) | |
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oenerei omces: m2 West Michigan Avenue, Jackson, M6chigan 49201 Area Code S17 788-OSSO September lo, 1969 Dr. Peter A. Morris, Director Division of Reactor Licensing United States Atomic Energy Ccmmission Washington, DC 20545
Dear Dr. Morris:
Att:
Mr. D. J. Sk ovholt In June 1967, we reported upon the then current Big Rock Point Plant operating procedures for the main steam bypass valve and, also, upcn two planned modifications to the plant to improve reliability.
In our Eighth Semiannual Report (covering the period 11/1/67 - h/30/6S), we reported upon the completion of installation of these two modifications:
The installation of a d-c motor-operated isolation valve ahead of the by-pass valve; and the installation of a second source of station power, via a 46 kv transmission lire, with automatic throw-over features.
In the Ninth Semiannual Report (covering the period 5/1/68 - 10/31/68), we also reported upon the results of a 30 Mwe load rejection test which tended to confirm our statement in the June 1967 letter that the bypass valve would
- 4ot prevent a reactor scram for load rejections above 50 Mwe.
Since we have now been operating for some time with the new equipment installed, this letter will serve to bring you up to date on our current operating practices and on our future plan.s.
Nomal operation of the bypass valve system is with the bypass valve controller in automatic and with the d-c motor-operated isolation valve open. Steam leaks through packing on these valves do develop, how-ever.
In order to permit the plant to operate until a routine maintenance shutdown can be scheduled, operation with the isolation valve closed is permitted.
The bypass valve is not required for protection of the reactor nor is it a factor in any of the accident analyses which were performed on the plant.
Its function was to prevent a reactor scram following a loss of the transmission line leaving the plant. Thus, in our judgment, the above mode of operation is consistent with our present Technical Specifications and does not present an unreviewed safety question.
ACKNOWIIDGiD 2LGM %29 v
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- Dr. Pstsr A. Morrin
-2 Septem'.er 10,1%9 As is evidenced by our operating proccoures, we intend to con-
_tinue to utilize the bypass valve to the extent practicable to limit plant transients and, accordingly, following several minor modifications to the system, we intend to perform another 30 Mwe load rejection test. These-changes will, in our opinion, bring the system to its full capability and this test will' permit us to better evaluate this capability. Further
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testing beyond this is not planned.
We will be happy to discuss this matter further with you should you have any questions.
Yours very truly,
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-R. L. Haueter Electric Production Superintendent -
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