ML12339A002
| ML12339A002 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/29/2012 |
| From: | St.Onge R Southern California Edison Co |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| Download: ML12339A002 (5) | |
Text
SOUTHERN CALIFORNIA EDISON Richard J. St. Onge Director, Nuclear Regulatory Affairs and Emergency Planning An EDISON INTERNATlONAL Company November 29, 2012 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001 10 CFR 50.55a
Subject:
Docket Nos. 50-361 and 50-362 Response to Request for Additional Information Regarding ASME Code Update for the Fourth Ten-Year Interval, Inservice Testing (1ST) Program, IST-4-P-2 (Enclosure 2)
San Onofre Nuclear Generating Station, Units 2 and 3
Reference:
Letter from R. St Onge (SCE) to the U.S. Nuclear Regulatory Commission (NRC) dated August 06,2012;
Subject:
Docket Nos.
50-361 and 50-362, ASME Code Update for the Fourth Ten-Year Interval, Inservice Testing Program San Onofre Nuclear Generating Station Units 2 and 3
Dear Sir or Madam,
By letter dated August 06,2012 (Reference) Southern California Edison (SCE) submitted the ASME Code Update for the Fourth Ten-Year Intervallnservice Testing (1ST) Program in accordance with 10CFR 50.55a. SCE requested NRC approval by August 18, 2013, to support the fourth ten-year interval.
Bye-mail dated November 08,2012, the NRC requested additional information in support of review of ASME Code Update for the Fourth Ten-Year Interval 1ST Program, IST-4-P-2 (Enclosure 2). Response to the NRC's request for additional information is provided in the Enclosure to this letter.
There are no new regulatory commitments contained in this letter. If you have any questions or require additional information, please contact Licensing Manager, Ms. Linda T. Conklin, at (949) 368-9443.
P.O. Box 128 San Clemente, CA 92672
Document Control Desk
Enclosure:
as stated November 29, 2012 cc:
E. E. Collins, Regional Administrator, NRC Region IV R. Hall, NRC Project Manager, San Onofre Units 2 and 3 B. Benney, NRC Project Manager, San Onofre Units 2 and 3 G. G. Warnick, NRC Senior Resident Inspector, San Onofre Units 2 and 3
Enclosure Response to Request for Additional Information (RAI)
Regarding:
IST-4-P-2 (Enclosure 2) 10 CFR 50.55a(a)(3)(i) Alternative Provides Acceptable Level of Quality and Safety
RESPONSE TO NRC RAI REGARDING SCE IST-4-P-2 Code Update Fourth Ten-Year Intervallnservice Testing (1ST) Program NRC Question 1:
RAI 1ST-4-P-2-1 State the type of pump (horizontal centrifugal, vertical line shaft, positive displacement, etc.) for each pump listed in the request referenced above.
SCE Response:
Below are Tables 1 and 2 from the originaIIST-4-P-2 (Enclosure 2) revised with a, "Pump Type" column inserted between the Pump and Parameter columns, with the type of pump for each listed in the request referenced above.
TABLE 1 Pump Pump Parameter Instrument Reference Instr. Range Error As Installed Type Value l (Range/Ref Permitted Accuracy at Value) by Code2 Full Scale (error at full scale)
Emergency Chilled Water Pumps P160 Horiz.
Suction PI-9883B 30 psig 0-160 1.8 psig 0.5% (0.8 P162 Cent.
Pressure PI-9883A (5.3) psig)
Component Cooling Water Seismic Make-up Pumps Pl Ol Horiz.
Suction PI-6566 8.2 psig 0-30 0.49 psig 0.5% (0.15 8
Cent.
Pressure PI-6565 (3.7) psig)
PlOl 9
Diesel Generator Fuel Oil Transfer Pumps P093 Vert.
Discharge PI-5973 15.9 psig 0-60 0.95 psig 0.5% (0.3 P094 Line Pressure PI-5975 (3.8) psig)
P095 Shaft PI-5976 P096 PI-5974
'Reference values are based on historical data for like pumps P160, 2PI0 19, 2P093.
Other pumps in groups are similar. Future values may be slightly different, but overall Code accuracy requirements would be met or exceeded under all conditions under which an 1ST would be performed.
2The information in this column represents the gauge error permitted by the Code (3 times reference value X Code required accuracy of2%, for Group A or B Testing).
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TABLE 2 Pump Pump Parameter Inst.
Nominal Worst Instr. Range Error As Type Quarterly Case (Range/Ref.
Permitted Installed Reference3 Refueling Value) by CodeS Accuracy Reference4 at Full Scale (error at full scale)
Containment Spray System Pumps P012 Vert.
Suction PI-9087 27.6 psig 13.7 psig 0-75 0.206 psig 0.25%
P013 Cent.
Pressure PI-9085 (5.5)
(0.19 psig)
Low Pressure Safety Injection Pumps P015 Vert.
Suction PI-9081 31.5 psig 17.6 psig 0-60 0.264 psig 0.25%
P016 Cent.
Pressure PI-9083 (3.4)
(0.15 psig)
P015 Vert.
Discharge PI-9082 173 psig 159 psig 0-500 2.4 psig 0.25%
P016 Cent.
Pressure PI-9084 (3.1)
(1.25 psig) 3Reference values are based on historical data for like Unit 2 pumps POl2 and POl S.
Future values may be slightly different, but overall Code accuracy requirements would be met or exceeded under all conditions under which an 1ST would be performed.
4For the worst case refueling reference, the gauges read below the Code required range (i.e., less than 1/3 of full scale) 5The information in this column represents the gauge error permitted by the Code (3 times reference worst case refueling value X Code required accuracy of 0.5%, during Comprehensive Testing).
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