ML13302B162
| ML13302B162 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/19/1981 |
| From: | Rood H Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8109020014 | |
| Download: ML13302B162 (21) | |
Text
lee AUGUST 1 9 1981 Docket Nos.:
50-361/362 APPLICANTS: Southern California Edison Company (SCE)
San Diego Gas and Electric Company (SDG&E)
City of Anaheim, California (Anaheim)
City of Riverside, California (Riverside)
FACILITY:
San Onofre Nuclear Generating Station, Units 2 and 3
SUBJECT:
Summary of San Onofre Meeting on Unit 2 Water Hammer On July 31, 1981, members of the NRC staff met with the applicants in Bethesda, Maryland to discuss the above subject. Attendees at the meeting are given in Enclosure 1. Material presented at the meeting by the applicants is given in Enclosure 2. In addition to the information presented in Enclosure 2, the applicants stated that they would submit, by mid-August, 1981, a description of the tests that they planned to perform to demonstrate the adequacy of the revised design.
Original signed by' Harry Rood, Project Manager Licensing Branch No. 3 Division of Licensing cc:
See, next page.
8109020014 810819; PDR ADOCK 05000362 A
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- 3 OFFICE)
HRood:jb FJ glia sURNAME 8/\\kO81 8/
/81 NRc FORM 318 (10-80) NRCM 0240 OFFICIAL RECORDCOPY USGPO: 1981-335-960
0 Mr. Robert Dietch Vice President Southern California Edison Company 2244 Walnut Grove Avenue P. 0. Box 800 Rosemead, California 91770 Mr. D. W. Gilman Vice President -
Power Supply San Diego Gas & Electric Company 101 Ash Street P. 0. Box 1831 San Diego, California 92112 cc:
Charles R. Kocher, Esq.
James A. Beoletto, Esq.
Southern California Edison Company 2244 Walnut Grove Avenue P. 0. Box 800 Rosemead, California 91770 Orrick, Herrington & Sutcliffe ATTN:
David R. Pigott, Esq.
600 Montgomery Street San Francisco, California 94111 Mr. George Caravaiho City Manager City of San Clemente 100 Avenido Presidio San Clemente, California 92672 Alan R. Watts, Esq.
Rourke & Woodruff Suite 1020 1055 North Main Street Santa Ana, California 92701 Lawrence Q. Garcia, Esq.
California Public Utilities Commission 5066 State Building San Francisco, California 94102 Mr. V. C. Hall Combustion Engineering, Incorporated 1000 Prospect Hill Road Windsor, Connecticut 06095
0 Mr. Robert Dietch
- 2 Mr. D. W. Gilman cc:
Mr. P. Dragolovich Bechtel Power Corporation P. 0. Box 60860, Terminal Annex Los Angeles, California 90060 Mr. Mark Medford Southern California Edison Company 2244 Walnut Grove Avenue P. 0. Box 800 Rosemead, California 91770 Henry Peters San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Ms. Lyn Harris Hicks Advocate for GUARD 3908 Calle Ariana San Clemente, California 92672 Richard J. Wharton, Esq.
Wharton & Pogalies University of San Diego School of Law Environmental Law Clinic San Diego, California 92110 Phyllis M. Gallagher, Esq.
Suite 222 1695 West Crescent Avenue Anaheim, California 92701 Mr. A. S. Carstens 2071 Caminito Circulo Norte Mt. La Jolla, California 92037 Resident Inspector, San Onofre/NPS c/o U. S. Nuclear Regulatory Commission P. 0. Box 4329 San Clemente, California 92672 Charles E. McClung, Jr., Esq.
Advocate for Guard Fleming, Anderson, McClung & Finch 23521 Paseo de Valencia, Suite 308A Laguna Hills, California 92653
ENCLOSURE 1 ATTENDEES SAN ONOFRE UNIT 2 WATER HAMMER NAME ORGANIZATION H. Rood NRC-DL B. Mann NRC-ASB W. C. Moody SCE J. H. Sodergren CE F. R. Nandy SCE R. M. Rosenblum SCE R. L. Phelps SCE R. Lobel NRC-DSI Bob Dawson FPL-St. Lucie 2 J. T. Han NRC Brent Clayton NRC-DHFS Newton Anderson NRC/NRR/GIB Bill Heilker CE Don S. Cassell CE E. H. Kennedy CE Gurdip Singh CE R. S. Daleas CE E. Embro NRC/AEOD R. L. Tedesco NRC-NRR J. R. Fair NRC/IE/REB
- 0. J. Boissy FPL K. R. Wkichman NRC/NRR/ORAB H. L. Brammer NRC/DE/MEB J. R. Rajan NRC/DE/MEB J. P. Waldman NRC/DST/GIB G. B. Georgiev NRC/IE Earl J. Brown NRC/AEOD John N. Ridgely NRC/ASB V. D. Bennett CE S. H. Freid Bechtel J. M. Collins SCE
- 0. D. Parr NRC/DSI S. R. Fiore NRC/IE/REB R. J. Bosnak NRC/DE/MEB S. D. MacKay NRC/DHFS/PTRB
ENCLOSURE 2 JULY 31, 1981 MEETING AGENDA SAN ONOFRE UNIT 2.FEEDWATER RING DAMAGE INTRODUCTION F. NANDY DAMAGE REPORT J. SODERGREN FEEDWATER HAMMER TEST R. ROSENBLUM DAMAGE MECHANISM B. HEILKER FEEDWATER RING REPAIR J. SODERGREN FEEDWATER RING INTERGRITY TEST R. ROSENBLUM QUESTIONS ----
SUMMARY
F. NANDY
July 31, 1981 PRELIMINARY REPORT OF CONDITION OF FEEDWATER PIPE ASSEMBLY I N SAN ONOFRE UNIT 2, NO. 2 STEAM GENERATOR The damaged pipe is in Steam Generator E088 (SCE designation). The CE Chattanooga designation is Steam Generator 2. This Steam Generator is also referred to as the North Steam Generator.
The feedwater pipe is located in the down comer approximately 75" below the Steam Separator Support Deck (Can Deck).
- Feedwater pipe
.- Feedwater nozzle,,ith
-. 1 thermal liner Support Feedwater distribution box.
Page 1 of 9
The feedwater pipe assembly is supported on four (4) brackets. These brackets are welded to the pressure boundary with full penetration welds. The brackets are located at the 900, 1660, 1940 and 2700 locations. The feedwater nozzle and water distribution box is located at the O position.
00 Feedwater nozzle 2700 900 Feedwater ring support bracket 1800 Detail of Feedwater ring Support bracket Page 2 of 9
,The feedwater pipe is fabricated from SA-106-Grade B, 12" schedule 40 pipe (nominal wall thickness 0.406").
The feedwater pipe assembly is made in two sections. These sections are referred to herein as the 0-900 section and the 0-2700 section. The 0-900 section is supported at the feedwater distribution box and on brackets located at the 900 and 1660 positions.
The 0-2700 section is supported at the feedwater distribution box and on brackets located at the 2700 and 1940 position.
J-Tube 1 00 J-Tube 1 J-Tube 19
,-Tube 19 2700 rr 900 J-Tube 38 J-Tube 38 1800 The discharge nozzles on top of the feedwater pipe are referred to as J-Tubes.
There are 38 J-Tubes in each section of the feedwater pipe assembly.
The J-Tubes are numbered starting at the feedwater distribution box.
In the 0-900 section the numbering system is clockwise (as viewed from top of ring) and counter clockwise in the 0-2700 section.
Page 3 of 9
- 1. Condition Of The Feedwater Distribution Box Original condition Rotation in the plane of the paper.
(Note: the rotation is greatly dfre odto o a \\-All four bolts sheared off.
Page 4 of 9
- 2. Condition Of Feedwater Pipe Assembly 0-900 Section The visual deformation of the feedwater ring starts approximately 10" frcm the water distribution box (Pipe ovality checks indicate that the deformation starts about 2" from the box). The sketch below describes the condition of the pipe between J-Tubes 4 and 5.
Pressure Boundary 5 1/4" 1 1/2"
/
17" 3 3/16" The above condition is typical up to J-Tube 9 after which the deformation switches from vertical to horizontal.
page 5 of 9
-The sketch below describes the condition between J-Tubes 9 and 10.
5 3/41" 17"1 Pressure Boundary 3 3/4" 450 i
The above cross section is typical until approximate J-Tube 19 (cross section is rotating counter clockwise as J-Tube 19 is approached.
J-Tube is located imediately prior to the 900 support bracket). At this location the pipe regains the original round shape.
This condition remains to the end of the pipe section. There is no apparent deformation of the end plate.
Page 6 of 9
- 3. Conditio Of The Feedwater Pipe Assembly 0-2700 section.
'The visual deformation starts about 18" (between J-Tubes 2 and 3) from the water distribution box. The sketch below depicts the pipe cross section
'between J-Tubes 4 and 5.
6 7/8" 15 Pressure Boundary 5 7/16"1 150 Paqe 7 of 9
The above cross section remains past J-Tube 6. The deformation switches from
'vertical to horizontal between J-Tubes 7 and 10.
Past J-Tube 10 the deformation is horizontal.
The sketch below depicts the pipe cross section between J-Tubes f14 and 15.
Pressure Boundary Some metal contact on I.D. between top and bottom of pipe 3 3/811 3 5/16" 17" This condition is typical (although less crushing) up to J-Tube 20. Past J-Tube 21 the ring regains its original circular cross section.
Page 8 of 9
- 4.
Condition of Support Brackets All brackets have been visually inspected and no defects were detected. A MT inspection revealed some minor indications in three of the six brackets. It is believed that these indications are not a result of the loading that occurred during the feed water sparger collapse. The indications are probably porosity or slag and they can be removed. No welding to the pressure boundary will be required.
- 5. Condition of U-bolts a)
(@ 900 bracket).
U-bolts were stretched upward beyond the elastic limit. Bolts did not fail but assembly loose.
b) (@ 1660 bracket).
Condition is the same as described in 5(a) above.
c) (@ 2700 brackets).
Both U-bolts failed at the threads. U-bolts deformed beyond elastic limit.
d) (@ 1940 bracket).
Condition is the same as described in 5-(c) above.
Page 9 of 9
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FEEDWATER SPARGER BUCKLING CONSIDERATIONS DAMAGE MECHANISM: SUDDENLY APPLIED DIFFERENTIAL PRESSURE FACTORS WHICH REDUCE THE LOAD CARRYING CAPACITY OF THE PIPE:
(A) OVALITY (B) VARIATION IN THICKNESS (C) HOLES IN THE PIPE (D) UNBALANCED& P LOADING
FEOATER SPARGER COLLAPSE MODOD 3 3//
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FEEDWATER DISTRIBUTOR BOX SUPPORTS AND LOADING Feedwater Distribution Box Unbalanced
-2 Loading O0 O 0
O Original condition Rotation in the plane of the paper. (Note: the rotation is greatly deformed exaggerated) condition
-.All four bolts sheared off.
FEEDWATER SPARGER SUPPORTS AND SUPPORT LOADING JI Unbalanced AP Loading
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Haass If. Den ton D. 1-ull1erI E. Cse R. Ballard D. Eise1nhut 1..
Regan P.. Purple R. Mattson B. J. Ycung5lood P. Check A. Sc-.enccr 1M. Srinivasan F. Piraclia
- 0. Parr J. Nillcr F. Rosz G. Lainas
. Butler R. VolImer
. Kreger J. P. Knight P. Houston R. Bosnak T. Murphy F. Schauer L. Rubenstein R. E. Jackson T. Speis Project Manager H. Rood W. Johnston Attorney, OELD J. Lee S. Hlanaucr OT
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Com'.mi llI ACRS (16)
T. Murley R. Tedesco
- r. Shiruedcr D. Skovbul t M. Erns L NRC
Participants:
B. Mann J. Waldman R. Lobel G. Georgiev K. Kniel J. T.*Han E. Brown G. Knigjht.oni B. Clayton J. Ridgely A. Thadani N. Anderson
- 0. Parr D. Tondi E. Imbro S. Fiore J. Kramer R. Tedesco R. Bosnak D. Vassallo J. Fair S. MacKay P. Collins K. Wichman.
D. Ziemann H. Brammer E. Adensam J. Rajan bcc: Applicant & Service List