ML16342D834
| ML16342D834 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 10/14/1997 |
| From: | Steven Bloom NRC (Affiliation Not Assigned) |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| References | |
| TAC-M97914, TAC-M97915, NUDOCS 9710200183 | |
| Download: ML16342D834 (10) | |
Text
October 14, 1997 Mr. Gregory M. Rueger Pacific Gas and Electric Company NPG - Hai 1 Code A10D P. 0.
Box 770000 San Francisco, California 94177
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - LICENSE'MENDMENT REQUEST 97-11 RELATED'O AUXILIARYSALTWATER SYSTEM PIPING BYPASS UNREVIEWED SAFETY QUESTION (TAC NOS.
M97914 AND M97915)
Dear Hr. Rueger:
By letter dated August 26, 1997. Pacific Gas and Electric Company (PG8E) submitted an application for license amendment (LAR 97-11) related to auxiliary saltwater (ASW) piping unreviewed safety question (USQ).
In order to complete our review, we require the additional information listed in the enclosure.
Please submit your response within 30 days from the date of this letter.
Sincerely, Docket Nos.
50-275 and 50-323
Enclosure:
Request for Additional Information cc w/encl:
See next page ORIGINAL SIGNED BY Steven D. Bloom, Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office ot Nuclear Reactor Regulation DISTRIBUTION:
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2055&0001 October 14, 1997 Mr. Gregory M. Rueger Pacific Gas and Electric Company NPG - Hail Code A10D P. 0.
Box 770000 San Francisco, California 94177
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - LICENSE AMENDMENT REQUEST 97-11 RELATED TO AUXILIARYSALTWATER SYSTEM PIPING BYPASS UNREVIEWED SAFETY QUESTION (TAC NOS.
H97914 AND M97915)
Dear Mr. Rueger:
By letter dated August 26.
1997, Pacific Gas and Electric Company (PGKE) submitted an application for license amendment (LAR 97-11) related to auxiliary saltwater (ASW) piping unreviewed safety question (USQ).
In order to complete our review, we require the additional information listed in the enclosure.
Please submit your response within 30 days from the date of this letter.
Sincerely, Docket Nos.
50-275 and 50-323
Enclosure:
Request for Additional Information cc w/encl:
See next page even D. Bloom. Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation
\\
Hr. Gregory H. Rueger cc w/encl:
NRC Resident Inspector Diablo Canyon Nuclear Power Plant c/o U.S. Nuclear Regulatory Commission P. 0.
Box 369 Avila Beach, California 93424 Dr. Richard Ferguson, Energy Chair Sierra Club California 1100 11th Street, Suite 311 Sacramento, California 95814 Ms. Nancy Culver San Luis Obispo Hothers for Peace P. 0.
Box 164 Pismo Beach, California 93448 Chairman San Luis Obispo County Board of Supervisors Room 370 County Government Center San Luis Obispo, California 93408 Mr. Truman Burns Hr. Robert Kinosian California Public Utilities Commission 505 Van Ness, Room 4102 San Franci sco, Cal iforni a 94102 Hr. Steve Hsu Radiologic Health Branch State Department of Health Services Post Office Box 942732 Sacramento, California 94232 Diablo Canyon Independent Safety Committee ATTN:
Robert R. Wellington, Esq.
Legal Counsel 857 Cass Street, Suite D
Monterey, California 93940 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower 5 Pavillion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Christopher J. Warner, Esq.
Pacific Gas 8 Electric Company Post Office Box 7442
"'an Francisco, California 94120 Hr. Robert P.
Powers Vice President and Plant Manager Diablo Canyon Nuclear Power Plant P. 0.
Box 56 Avila Beach, California 93424 Tel egram-Tribune ATTN:
Managing Editor 1321 Johnson Avenue P.O; Box 112 San Luis Obispo, California'3406
~I
ENCLOSURE RE UEST FOR ADDITIONAL INFORMATION PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT UNITS NOS.
1" AND 2 DOCKET NOS. 50-275 AND 50-323 Indicate if the system is required to operate after experiencing Hosgri earthquake ground motion in order to maintain the plant in a safe shutdown condition.
2.
Provide detailed justification to demonstrate that the Dresser couplings will function under simultaneous internal pressure and the largest expected dynamic axial displacement.
3.
Provide a copy of the report "Dynamic Soil Properties for Analysis of ASW Piping System
- Bypass, DCPP," by Robert Pyke, May 28, 1996 (Reference 2,
page 25 of'ttachment A to the letter of August 26, 1997).
Provide a detailed discussion of the following statements (page 30 of Attachment A to the letter of'ugust 26, 1997):
"The largest calculated soi 1 displacements result from the softest soil (lowest shear velocity),
while the internal forces in the buried piping system result from the stiffest soil springs (highest shear wave velocity).
To account for variability in input parameters, a conservative. combination of spring stiffness and imposed displacement inputs were used in the buried piping model."
Show how these were considered in the buried piping calculations.
For the buried piping system shown in Figure 5b-1 of your response of'arch 25.
1997, to an NRC request for information:
a.
Provide the detailed basis and calculation of the axial and transverse soil springs stiffnesses.
b.
Provide the detailed basis and calculation of the frictional forces per unit length acting on the buried piping.
c.
Provide the values of the input displacements to the piping analysis under the following loading conditions:
~
Dead Loads
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Soil Settlement Loads
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Seismic Loads (HE)
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Soil Liquefaction Loads
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Tsunami Loads
~,
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d.
Provide the largest design basis demands (axial forces.
shear
- forces, bending moments, torsional moments.
displacements and rotations) and their locations on the piping system as a result of the following loading conditions:
~
Dead Loads
~
Internal Pressure Load
~
Thermal Loads
~
Soil Settlement Loads
~
Seismic Loads (HE)
~
Soil Liquefaction Loads
~
Tsunami Loads e.
State if the magnitude of the axial stresses in any load combination was determined from the absolute sum of the axial stresses due to axial effects and the lateral effects.
If not. provide justification for not doing so.
f.
Show that the largest pipe stresses resulting from the following load combinations meet the ASW buried piping acceptance criteria:
~
Hosgri Earthquake Combination
~
Sustained Plus Thermal Load Effect Combination (Soil Settlement Loads and Soil Liquefaction Loads)
~
Tsunami Combination (considering Soil Liquefaction Loads) 6.
The load combinations and acceptance criteria that were specified for the long-term seismic program (LTSP) loads are based on EPRI NP-6041.
Show that stresses due to load combinations involving LTSP loads meet the licensing basis acceptance criteria for buried piping.
7.
State the magnitude of the largest potential aftershock for the Hosgri event.
Provide an estimate of the effect on the ASW piping due to the soil and anchor displacements caused by the Hosgri main shock in addition to the ground motion from this aftershock:
Provide the detailed qualification of the reinforced concrete anchor thrust blocks that may be affected by displacements within the soil liquefaction zone.
Include the loading condition associated with simultaneous start-up of all ASW pumps.
Provide the inservice inspection measures to detect future potential corrosion of the buried piping.
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V