ML13063A442

From kanterella
Jump to navigation Jump to search
LTR-13-0183 - E-mail Don Leichtling Media Alert - Chart of Three Modes of San Onofre Unit 2 Operation, 100%, 70% and MSLB with Multiple Tube Failures
ML13063A442
Person / Time
Site: San Onofre  Southern California Edison icon.png
Issue date: 02/27/2013
From: Leichtling D
The DAB Safety Team
To: Macfarlane A
NRC/Chairman
References
LTR-13-0183
Download: ML13063A442 (6)


Text

OFFICE OF THE SECRETARY CORRESPONDENCE CONTROL TICKET Date Printed: Feb 28, 2013 15:2 7 PAPER NUMBER: LTR-13-0183 LOGGING DATE: 02/28/2013 ACTION OFFICE:

EDo T;4 AUTHOR: Don Leichtling AFFILIATION:

ADDRESSEE: Chairman Resource

SUBJECT:

Media Alert - Chart of three modes of San Onofre Unit 2 operation, 100%, 70% and MSLB with multiple tube failures ACTION: Appropriate DISTRIBUTION: SECY to Ack.

LETTER DATE: 02/27/2013 ACKNOWLEDGED Yes SPECIAL HANDLING:

NOTES:

FILE LOCATION: ADAMS DATE DUE: DATE SIGNED:

if~~e:

-017 gLS' VcA SEL'4YO0

Joosten, Sandy From: Capt.D [captddd@gmail.com]

Sent: Wednesday, February 27, 2013 7:40 PM To: Capt D

Subject:

Media Alert: Chart of three modes of Unit 2 operation, 100%, 70% and MSLB with multiple tube failures.

The DAB Safety Team: February 27, 2013 Media

Contact:

Don Leichtling (619) 296-9928 or Ace Hoffman (760) 720-7261 Charts: San Onofre Unit 2 Modes Of Operation Table I - San Onofre RSGS Design and Operational Data U2 RSGs U2 RSGs MSLB with Multiple 8 Ruptures @600 gpm Design and Operational Parameters which caused FEI, FIRVand @100% @70% U2 RSGs MFE Power Power @0% Power (1) Reactor Thermal Power, MWt 1729 1215 0 IReactor Trip)

(1A) Unit Electrical Generation, MWe 1183  ? N/A (2) Number of Tubes 9727 9727 12,580 (3) Average Length of Heated Tubes, inches m 729.56 729.56 729.56 (4) Heat Transfer Area, ft-2 116,100 116,100 116,100 (5) Tube Wall Thickness, inches 0.043 0.043 0.043 (SA)Tube Diameter, inches 0.75 0.75 0.75 (S1) Tube Pitch, inches 1.0 1.0 0.87 (5C) Tube Array Triangular Triangular Triangular/Square (5D) Tube Index 1.33-1.43 1.33-1.43 1.52-1.67 (SE)Tube to tube clearance, inches 0.25 0.25  ?

(5F) Nominal Gap between tube and AVB", cold, inches 0.002 0.002 0.003 (5G) Nominal Gap between tube and AVE", Hot, inches 0 0 0 (5H) Nominal Gap, Manufacturing Dispersion, inches N/A N/A N/A (51)Tube Wall Thickness/Tube Diameter Ratio 0.057 0.057 0.057 (5J) Average Heated Tube Length/Tube Diameter Ratio 973 973 973 (6) Reactor Coolant Flow (at cold leg temperature),, Million 79.8 78.2 0(RCS Pump Trip) lbs./hour (6A) Reactor Coolant Operating Temperature (Thot), OF 598 591 592 (6B) Reactor Coolant Operating Temperature (Tcold), OF 541 551 551 (7) RSG Operating Pressure (@100% power), psia 892 946 ATM (8) Steam Operating Temperature @ (1%power), OF 531 538 212 (SA) Steam Flow, Million lbs./hour 7.6 5.1 Feedwater Inventory to Environment in 5 -15' Minutes - SG Empty (88) Feed-water Inlet Temperature , OF 442 407 N/A (9) Feedwater Flow. Million lbs./hour 7.6 5.1 0 (Feedwater Pumps Trip)

(10) Steam Quality, % 90% 36% > 90%

(11) Void Fraction, % 98.5% 92.6% 100%

(l1A) Maximum Gap Fluid Velocity, feet/second 25.1 12.6 > 50 1

(11B)Secondary fluid density, Ibm/cubic feet 7 12 <7 (12) Reactor Coolant Volume, ft3 2003 2003 15,000 gallons RCSTube Inventory contained in tubes escapes to the Environment in 5 -15*

Minutes (13) Circulation Ratio 3.3 4.9 0 (13A) Down-comer Feed-water Flow, Mibs./hour 24.8 24.8 0 (14) Delta Te = ITS,6A) - (TSAT, 7A), OF 67 53 "400 Fluid Elastic Instability NO NO YES(Film Boiling)

Significant Radiation-Flow-induced Random Vibration YES YES YES Mitsubishi Flowering Effect YES NO YES Flashing Feedwater Jet Impingement Forces on Tubes N/A N/A YES Compilation of data based on Publicly Available Documents (e.g., Westinghouse Operational Assessment, SCE Unit 3 Root cause Evaluation, htti://www.efunda.com/materials/water/steamtablc sat.cfm, etc.)

  • No Operator Action assumed in 15 minutes
    • Radiation will exceed SCE FSAR limits. Offsite releases probability due to multiple tube ruptures will exceed assumed Core Damage Probability (CDP) and Large 2

Early Release Probability (LERP) of 2X 10-7 stated In SCE Enclosure 2, page 20.

Boiling Regimes Free Convection Nucleate Transition Film SRadiation Stable effects signflcani Isolated Jets and Film Bubbles Columns Boiling I ,

i 05 104' 10LI 5 10 30 120 1000 AT6= Ts- Tsat (oC)

Boiling Curve for water at I atm.

Surface heat flux q" as a function of excess temperature ATe= Ts - TsM littp)://en.wikipedia.orp,/wiki/Film boiling 3

1.5 e 1.0 -

VORTEX IND)UC ED VIBRATION NSTABILITY 0.5 TRESHOLD TURBULENCE INDUCED VIBIR ATION 01 0 1.0 2.0 3.0 PITCH FLOW VELOCITY Im/s)

Figure 1 - Vibrations amplitude as a function of flow pitch velocity for a flexible cylinder in a rigid i from Pettigrew et al. 1991). The cylinder is free to vibration in the cross-flow direction.

Reference:

Violette R., Pettigrew, M.J., Mureithi N.W. (2006). Fluidelastic Instability c Tubes Preferentially Flexible in the Flow Direction Subjected to Two-Phase Cross Flow.

of the ASME. Journalof PressureVessel Technology, 128(1), p. 148-159.

4

These charts will be posted on the web at this link: DAB Safety Team Documents.

The DAB Safety Team: Don, Ace and a BATTERY of safety-conscious San Onofre insiders plus industry experts from around the world who wish to remain anonymous. These volunteers assist the DAB Safety Team by sharing knowledge, opinions and insight but are not responsible for the contents of the DAB Safety Team's reports. We continue to work together as a Safety Team to prepare additional: DAB Safety Team Documents, which explain in detail why a SONGS restart is unsafe at any power level without a Full/ThoroughlTransparent NRC 50.90 License Amendment and Evidentiary Public Hearings. For more information from The DAB Safety Team, please visit the link above.

Our Mission: To prevent a Trillion Dollar Eco-Disaster like Fukushima, from happening in the USA.

Copyright February 27, 2013 by The DAB Safety Team. All rights reserved. This material may not be published, broadcast or redistributed without crediting the DAB Safety Team. The contents cannot be altered without the Written Permission of the DAB Safety Team Leader and/or the DAB Safety Team's Attorney.

5