ML13333A591
| ML13333A591 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/18/1987 |
| From: | Medford M SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| TASK-03-02, TASK-03-04.A, TASK-3-2, TASK-3-4.A, TASK-RR NUDOCS 8711240035 | |
| Download: ML13333A591 (27) | |
Text
Southem California Edison Company P. O. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 M. 0. MEDFORD TELEPHONE MANAGER OF NUCLEAR ENGINEERING (818) 302-1749 AND LICENSING November 18, 1987 U. S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Tornado Loadings San Onofre Nuclear Generating Station Unit 1 On September 25, 1987, representatives of SCE and their consultant met with the NRC staff and their consultant in Bethesda, Maryland. The purpose of the meeting was to resolve the remaining items on the Systematic Evaluation Program Topics 111-2, Wind and Tornado Loadings, and III-4.A, Tornado Missiles. The remaining items are identified in Enclosure 1 to this letter.
The purpose of this letter is to document the agreements made at the meeting and to provide completed responses to the remaining items in Enclosure 2.
If you have any questions regarding this matter, please call me.
Very truly yours, Enclosures cc:
J. 0. Bradfute, NRR Project Manager, San Onofre Unit 1
- 3. B. Martin, Regional Administrator, NRC Region V F. R. Huey, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3 8711240035 871118 4
PDR ADOCK 05000206 PDR Meeting Agenda 25 September 1987 WIND AND TORNADO LOADINGS SAN ONOFRE 1
- 1.
The possibility of the vent stack collapsing and impacting equipment or structures needed for safe shutdown.
- 2.
The way in which the condensate storage tank, if required for safe shutdown, is protected against tornado and wind missiles.
- 3.
Design criteria for proposed modification concepts including applicable codes and minimum horizontal windspeed capacity.
(Note:
the NRC's 10-.r windspeed is 135 mph.
Modifications should be designed according to this criterion).
Also indicate a time frame for completion of modifications.
- 4.
The RWS tank does not meet the NRC's 10-" windspeed criterion and the Licensee does not propose to modify it. (The RWS tank has a capability of withstanding 123 mph winds whereas the NRC's 10 criterion is 135 mph.)
The Licensee should either commit to modify this tank to meet the 135 mph limit or identify conservatisms in the analysis that would suggest an actual performance capacity higher than 123 mph.
0 0
ITEM 1 The possibility of the vent stack collapsing and impacting equipment or structures needed for safe shutdown.
RESPONSE
A calculation which demonstrates the capability of the vent stack is provided. The calculation shows the vent stack can withstand winds up to 135 mph without failure. The calculation also includes the impact of a tornado missile on the vent stack. The calculation reviewed during the September 25, 1987 meeting by the NRC staff and their consultant, Franklin Research Center, did not include the tornado missile. Therefore, based on this calculation, the vent stack will not collapse during a tornado event and consequently will not affect safety related equipment or structures required for safe shutdown.
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ITEM 2 The way in which the condensate storage tank, if required for safe shutdown, is protected against tornado and wind missiles.
RESPONSE
The condensate storage tank is not required for safe shutdown. Therefore, it will not be protected against tornado and wind missiles. The auxiliary feedwater storage tank, which is being protected, is required for safe shutdown. The condensate storage tank is identified as a possible source of water if it is available.
ITEM 3 Design criteria for proposed modification concepts including applicable codes and minimum horizontal windspeed capacity. (Note:
The NRC's 10-5 windspeed is 135 mph. Modifications should be designed according to this criterion.)
Also indicate a time frame for completion of modifications.
RESPONSE
The NRC tornado windspeed of 135 mph will be included in the Retrofit Design Criteria Manual for San Onofre Unit 1. This document provides the criteria by which modifications to the plant are designed. The document was reviewed by the NRC staff during the September 25, 1987 meeting. The tornado total windspeed velocity of 135 mph will be broken down into its rotational and translational speed in accordance with the Fujita model.
The total windspeed of 135 mph will be used to determine tornado missile velocities. In the event that significant unanticipated design problems result from the above criterion, a case-by-case reevaluation with the NRC will be requested.
The schedule for implementation of modifications associated with tornado protection is determined in accordance with the Integrated Implementation Schedule (IIS).
The IIS ranks all plant modifications in accordance with their safety importance. A preliminary ranking of the tornado modifications indicates they would be implemented during the Cycle XII refueling outage (approximately the third quarter of 1992).
The final schedule will be included in the April 1988 IIS submittal.
ITEM 4 The RWS tank does not meet the NRC's 10-5 windspeed criterion and the Licensee does not propose to modify it. (The RWS tank has a capability of withstanding 123 mph winds whereas the NRC's 10-5 criterion is 135 mph.)
The Licensee should either commit to modify this tank to meet the 135 mph limit or identify conservatisms in the analysis that would suggest an actual performance capacity higher than 123 mph.
RESPONSE
An analysis of the missile impact on the RWST using the 135 mph tornado was performed. The lower course of the tank is.329 inches thick and the upper four courses are.25 inches.
The results indicated that the lower course of the RWST can withstand a tornado missile, the rebar or utility pole, in a 135 mph tornado windspeed. The calculation was provided to the NRC staff for their review during the September 25, 1987 meeting and is provided as an attachment. The lower course of the RWST contains one-fifth of the tank volume. Since the tank holds over 241,000 gallons of borated water and it is required by Technical Specifications to maintain a minimum of 240,000 gallons of borated water, the lower course will retain approximately 48,000 gallons of borated water. Assuming the RWST is penetrated just above the lower course, 48,000 gallons of borated water would be available for plant shutdown.
As part of the Fire Protection Program Review, minimum water requirements for the safe shutdown of San Onofre Unit 1 following a fire were addressed. The scenario for these water requirements included very conservative assumptions such as loss of offsite power, no reactor coolant pumps and other sources of boration such as the Chemical and Volume Control System are not available. As a result of not having the reactor coolant pumps available a 20 hour2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> soak times is required to maintain coolant equilibrium. Details such as system leakages, shrinkage, reactor coolant pump leakage and boration requirements are provided in the SCE Fire Protection submittal dated May 21, 1986. Based on this information, the following is required:
- 1. 6,200 gallons of RHST water for boration.
- 2. 12,480 gallons of water needed during the first 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
(This includes the 6,200 gallons for boration.)
- 3. 14,400 gallons of water needed during the next 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> for a system soak time.
- 4. 9,360 gallons of water is needed for the final 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to bring the plant to cold shutdown.
A total of 36,240 gallons of water is required to bring the plant to cold shutdown within 34 hours3.935185e-4 days <br />0.00944 hours <br />5.621693e-5 weeks <br />1.2937e-5 months <br />. During a normal shutdown approximately 20,000 gallons of water including boration is needed to shutdown in about 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br />.
The lower course of the RWST retains 48,000 gallons of borated water. Based on the pump requirements and the location of the discharge pipe on the RWST, it is estimated that under 18,000 gallons of the RWST is not useful.
Such that the lower course contains 30,000 gallons of useful water. This is sufficient to get through the initial shutdown and the soak period which is 28 hours3.240741e-4 days <br />0.00778 hours <br />4.62963e-5 weeks <br />1.0654e-5 months <br />. Within that time period, additional water sources can be made available from Unit 1, Units 2 and 3, onsite or from offsite. This additional water would be used to bring the plant to cold shutdown and to continue to cool the plant.
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