ML20099H709
| ML20099H709 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 03/12/1985 |
| From: | Westafer G FLORIDA POWER CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| 30F385-10, NUDOCS 8503190466 | |
| Download: ML20099H709 (2) | |
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(8 ese Power CORPO R ATION March 12,1985 3F0385-10 Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing U.S. Nuclear Regulatory Commission Washingt".., D.C. 20555
Subject:
Ce;stal River Unit 3 Docket No. 50-302 Operating License No. DPR 72 High Energy Lines Used for Blowdown of the Once Through Steam Generators (OTSG)
Reference:
1)
NRC Letter from 3. F. Stolz to 3. A. Hancock, dated December 7,1982 2)
FPC Letter from G. R. Westafer to 3. F. Stolz, dated October 4,1984
Dear Sir:
In Reference I and its attached SER, the NRC concurred with FPC's request to use the OTSG drain lines for OTSG blowdown. These lines were to be used until Refuel V for brief periods of time (i.e., below 15% rated thermal power for startup and below 3000F average reactor coolant temperature for shutdowns) above the "high energy line" threshold (2000F or 275 psig) even through they did not contain pipe whip restiaints. It was planned that resolution of this item would take place before startup af ter Refuel V.
The engineering study and early design phases of this project indicated that ten to fifteen pipe whip restaints would be needed on the OTSG drain lines, at an initial cost of approximately $28,000 per restraint.
Therefore, FPC requested in Reference 2: 1) the drain lines downstream of valves MSV-176 and MSV-177 be exempted from consideration as high energy lines, if their use above 2000F or 275 psig was limited to less than 2% of the time they are below 2000F and 275 psig; and l
- 2) allowance to use the drain lines up to their design capability rather than still be limited to below 15% rated thermal power for startups and below 3000F average reactor coolant temperature for shutdowns.
lh 00l 8503190466 850312 PDR ADOCK 05000302
( 'y P
PDR GEN ERAL OFFICE 3201 Thirty fourth Street South e P.O. Box 14,A2, St. Petersburg, Florida 33733 e 813-866-5151
March 12,1985 3F0385-10 Page 2 However, the recently completed final design indicates a maximum of four pipe whip restraints are required, at an installed cost of approximately $15,000 per restraint. Of these four restraints, one would not have been exempted in any case and another may be eliminated pending evaluation during Refuel V of an inaccessible " break" location. Hence, the potential cost savings associated with the exemption has decreased from as much as $420,000 to less than $50,000. The 2% limit on blowdown time and any additional engineering expenditures required to pursue our request would further reduce any potential savings associated with our October 4,1984 request.
We, therefore, withdraw our October 4,1984 request to exempt the drain lines downstream of valves MSV-176/177 from high energy line consideration based on their limited use. FPC will Instead install during Refuel V the necessary pipe whip restraints required to comply with the December 7,1982 SER.
Sincerely, A
G. R. Westafer Manager, Nuclear Operations
- Licensing and Fuel Management DLT/feb cc:
Dr. 3. Nelson Grace Regional Administrator, Region II Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W., Suite 2900 Atlanta, GA 30323 L