Wednesday, February 27, 2013

San Onofre Data and Curves for today's NRC hearing! (2/27/2013)

2/27/2013 9:am PST

Dear Readers,

While listening to the upcoming NRC hearing on San Onofre about to be webcast from Maryland in about an hour (see below for more information), the attached "doc" file may be useful to review; it's the latest from the DAB Safety Team.

Sincerely,

Ace Hoffman
Carlsbad, CA


Table 1 – San Onofre RSGS Design and Operational Data

Design and Operational Parameters which caused  FEI, FIRV and MFE
U2 RSGs
@100% Power
U2 RSGs
@70% Power
U2 RSGs
@MSLB
@70% Power
(1) Reactor Thermal Power, MWt
1729
1729
1729
(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, ft2
116,100
116,100
116,100
(5) Tube Wall Thickness, inches
0.043
0.043
0.043
(5A) Tube Diameter, inches
0.75
0.75
0.75
(5B) 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

(5E) 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 AVB'', Hot, inches
0
0
0
(5H) Nominal Gap, Manufacturing Dispersion, inches
N/A
N/A
N/A
(5I) 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 lbs./hour
79.8
78.2
78.2
(6A) Reactor Coolant Operating Temperature (Thot), 0F
598
591
591
(6B) Reactor Coolant Operating Temperature (Tcold), 0F
541
551
551
(7) RSG Operating Pressure (@100% power), psia
892
946
ATM
(8) Steam Operating Temperature (@ 0% power), 0F
531
538
212
(8A) Steam Flow, Million lbs./hour
7.6
5.1
549
(8B) Feed-water  Inlet Temperature  , 0F
442
407
N/A
(9) Feedwater Flow, Million lbs./hour
7.6
5.1
33.8* to Environment in 3-5 Minutes
(10) Steam Quality, %
90%
36%
> 90%
(11) Void Fraction, %
98.5%
92.6%
100%
(11A) Maximum  Gap  Fluid Velocity, feet/second
25.1
12.6
> 50
(11B )Secondary fluid density, lbm/cubic feet
7
12
< 7
(12) Reactor Coolant Volume, ft3
2003
2003
2003 to Environment in 3-5 Minutes
(13) Circulation Ratio
3.3
4.9
0
(13A) Down-comer  Feed-water Flow, Mlbs./hour
24.8
24.8
0
(14) Delta Te = (TS, 6A) – (TSAT, 7A) , 0F
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
NO
NO
YES

Compilation of data based on Publicly Available Documents (e.g., Westinghouse Operational Assessment, SCE Unit 3 Root cause Evaluation, http://www.efunda.com/materials/water/steamtable_sat.cfm, etc.)


http://en.wikipedia.org/wiki/Film_boiling


Figure 1 – Vibrations amplitude as a function of flow pitch velocity for a flexible cylinder in a rigid cluster (taken 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 of an Array of Tubes Preferentially Flexible in the Flow Direction Subjected to Two-Phase Cross Flow. Transactions of the ASME. Journal of Pressure Vessel Technology, 128(1), p. 148-159. 




=======================================================

From: Martha Sullivan <marthasullivan@mac.com>
Subject: Reminder: TODAY 10a-1p PST, NRC Mtg w/ SoCal Edison on Restart of San
Onofre/Web- and Audio-cast Available

Reminder: TODAY 10a-1p PST, NRC Mtg w/ SoCal Edison on Restart of San Onofre. Telephone Bridge and Webcast from Mtg in Rockville MD Available. The purpose of the meeting is to discuss the U.S. Nuclear Regulatory Commission (NRC) staff's review of Southern California Edison's (SCE's) October 3,2012, response to the NRC's March 27, 2012, Confirmatory Action Letter for San Onofre Nuclear Generating Station, Unit 2. The NRC staff issued Requests for Additional Information (RAls) to SCE on December 26, 2012, and February 1, 2013 (the latter RAI included proprietary information). This meeting will include discussions on the licensee's responses to the RAls, the status of any outstanding questions from those RAls, and any additional questions issued by the NRC staff prior to the meeting.

This is a Category 1 Meeting. The public is invited to participate in this meeting and will have one or more opportunities to communicate with the NRC after the business portion, but before the meeting is adjourned. Proprietary information may be discussed during the meeting. These discussions will be deferred to the end of the meeting, which will be closed to members of the public who have not been granted access to the

Interested members of the public can participate in this meeting via Webcast link or toll-free audio teleconference. The Webcast link can be accessed at: http://video.nrc.gov . This link to the NRC webcast page will permit the user to select the meeting to be viewed and the viewing speed. The meeting link will become active approximately one hour prior to meeting start. The teleconference bridge number is 888-677-3916; passcode 8530507. Callers will initially be placed in a "listen only" status. At the designated point in the agenda, two­ way calling will be enabled, so that the public may ask questions of the NRC staff regarding the meeting discussions.