ML18190A168
| ML18190A168 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 07/27/1978 |
| From: | White L Rochester Gas & Electric Corp |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18190A168 (2) | |
Text
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ROCHESTER GAS AND ELECTRIC CORPORATION o
89 EAST AVENUE, ROCHESTER, N.Y. 14649 LEAN O. WHITE, JR.
VICE PRESIDENT TELEPHONE AREA CODE TIS 546-2700 July 27, 1978 Director of Nuclear Reactor Regulation Attention:
Mr. D.L. Ziemann, Chief Operating Reactors Branch No.
2 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C.
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Subject:
SEP Safe Shutdown Review R.E.
Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Ziemann:
During the NRC's SEP Safe Shutdown rev'iew of the Ginna Station (June 14-16, 1978),
we were requested to identify a variety of means by which the plant could be brought to a safe cold shutdown condition.
Since that time, another method has been identified which, though never demonstrated, appears feasible.
This information has been provided to the NRC Staff by telephone.
This letter documents that discussion.
If the normal residual heat removal (RHR) letdown valves 700 or 701 cannot, be opened, open (manually if necessary) the RHR discharge valves 720 and 721.
These valves will be used to provide suction to the RHR pumps.
Align valves such that reactor coolant flow is through 720 and 721, through the RHR recirculation line (with FE 628), through 704 A and/or B to the RHR pumps.
From there, flow would go through the RHR coolers, and thence through 857 A, B and C, or through 1816 A and B, to the Safety Injection Pumps, and ultimately to the RCS via valves 878 A, B, C, D.
Flow would be restricted to a few hundred gpm.
- However, this should be sufficient when going to cold shutdown, because of the low decay heat at that time.
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ROCHESTER GAS AND ELECTRIC oATE July 27, l978 To Mr. D.L. Ziemann, Chief SHEET NO.
2 This method is in addition to the other alternative cold shutdown methods previously discussed with the NRC:
1) use of steam generator blowdown lines
- 2) fillup steam lines after propping them up so they wouldn't collapse under the weight of the water, and use drain lines to remove water 3) let down via the CVCS: through the non-regenerative and excess letdown heat exchangers 4) cooldown from pressurizer to pressurizer relief tank to reactor coolant drain tank to the RHR system.
Please contact us if there are further questions.
Very truly yours, Leon D. White, Jr.
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